Please Note

The GDD models have only been “ground-truthed” in the Great Lakes region. Use of models outside of this region, including the North East, Great Plains and Transition Zones, should be used with caution. We do not recommend the GDD models we use for the mid/southern transition zone and southern states.

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Ester/Amine Spring Broadleaf Herbicide Timer - Purdue (GDD 50)
forecast for Wed, Dec. 17. 2025

 
  

Jefferson City, MO

        

Generously Supported By:



Tabular Data

Daily GDD accumulation for various base temperature models in 2024 & 2023

2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 31° 43° 15 5 0 0 0
02-16 17° 29° 16 5 0 0 0
02-17 13° 19° 16 5 0 0 0
02-18 3° 17° 16 5 0 0 0
02-19 0° 14° 16 5 0 0 0
02-20 -6° 16° 16 5 0 0 0
02-21 -3° 28° 16 5 0 0 0
02-22 12° 38° 19 5 0 0 0
02-23 23° 57° 37 13 0 0 0
02-24 37° 64° 66 31 8 0 0
02-25 36° 64° 94 50 17 1 0
02-26 46° 65° 127 73 30 6 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 37° 60° 154 90 36 6 0
02-28 36° 72° 186 112 49 10 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 29° 49° 204 119 49 10 0
03-02 24° 53° 220 126 49 10 0
03-03 36° 68° 249 145 58 12 0
03-04 50° 59° 282 168 71 17 0
03-05 30° 49° 300 176 71 17 0
03-06 26° 46° 313 179 71 17 0
03-07 40° 70° 346 202 84 22 0
03-08 33° 52° 367 213 84 22 0
03-09 30° 63° 391 227 89 22 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 37° 74° 425 250 102 27 1
03-11 48° 79° 466 282 124 41 10
03-12 45° 79° 506 312 144 53 17
03-13 48° 84° 550 346 168 69 28
03-14 59° 84° 600 386 198 91 44
03-15 43° 60° 629 405 207 92 44
03-16 32° 51° 649 415 207 92 44
03-17 31° 74° 679 435 218 95 44
03-18 55° 82° 726 472 244 113 58
03-19 39° 72° 759 495 258 119 58
03-20 33° 50° 779 505 258 119 58
03-21 35° 67° 808 524 267 119 58
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 38° 64° 837 543 276 120 58
03-23 43° 62° 867 563 286 123 58
03-24 41° 58° 894 580 293 123 58
03-25 40° 64° 924 600 303 125 58
03-26 43° 65° 956 622 315 129 58
03-27 49° 73° 995 651 334 140 64
03-28 59° 78° 1042 687 360 158 78
03-29 62° 73° 1087 723 386 176 90
03-30 47° 67° 1122 748 401 183 92
03-31 38° 56° 1148 764 407 183 92
04-01 37° 64° 1176 782 415 183 92
04-02 61° 74° 1222 818 441 201 105
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 49° 60° 1254 840 453 205 105
04-04 47° 50° 1280 856 459 205 105
04-05 43° 47° 1303 869 462 205 105
04-06 38° 51° 1326 882 465 205 105
04-07 32° 62° 1351 897 470 205 105
04-08 31° 56° 1372 908 471 205 105
04-09 45° 77° 1412 937 490 217 111
04-10 47° 70° 1448 964 507 225 115
04-11 46° 58° 1478 984 517 227 115
04-12 38° 70° 1511 1006 529 232 115
04-13 54° 85° 1558 1044 557 251 129
04-14 54° 71° 1599 1075 578 264 137
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 44° 62° 1630 1096 589 267 137
04-16 39° 74° 1665 1121 604 274 139
04-17 54° 82° 1711 1157 630 292 152
04-18 65° 78° 1761 1196 659 314 168
04-19 51° 62° 1795 1221 674 320 170
04-20 51° 77° 1837 1253 696 334 179
04-21 50° 70° 1875 1281 714 344 184
04-22 53° 82° 1920 1316 739 361 196
04-23 55° 80° 1965 1351 764 378 208
04-24 56° 82° 2012 1388 791 397 222
04-25 61° 75° 2059 1424 817 416 235
04-26 55° 60° 2094 1450 833 423 238
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 51° 63° 2129 1475 848 430 240
04-28 61° 85° 2180 1516 879 453 258
04-29 58° 76° 2225 1551 904 470 269
04-30 56° 74° 2268 1583 926 485 279
05-01 62° 74° 2314 1619 952 503 292
05-02 51° 70° 2352 1648 971 513 298
05-03 49° 58° 2383 1669 982 516 298
05-04 43° 67° 2416 1692 995 521 298
05-05 46° 67° 2451 1717 1010 528 300
05-06 45° 74° 2489 1745 1028 538 304
05-07 58° 73° 2533 1779 1052 554 315
05-08 56° 72° 2575 1810 1073 568 324
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 53° 72° 2615 1841 1094 580 332
05-10 47° 78° 2656 1872 1115 593 339
05-11 54° 79° 2700 1906 1139 609 351
05-12 57° 76° 2744 1940 1163 625 362
05-13 60° 79° 2792 1978 1191 645 377
05-14 61° 84° 2843 2019 1222 668 394
05-15 68° 88° 2899 2064 1257 696 417
05-16 57° 84° 2947 2103 1286 716 432
05-17 59° 75° 2992 2138 1311 733 444
05-18 60° 79° 3039 2175 1338 752 459
05-19 65° 80° 3090 2216 1369 775 476
05-20 61° 77° 3137 2252 1395 794 490
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 54° 73° 3178 2284 1417 807 498
05-22 50° 71° 3216 2312 1435 817 504
05-23 46° 71° 3253 2338 1451 826 507
05-24 56° 72° 3295 2370 1473 840 516
05-25 58° 63° 3333 2399 1492 850 521
05-26 55° 67° 3371 2427 1510 860 527
05-27 57° 71° 3413 2459 1532 874 535
05-28 59° 72° 3456 2492 1555 889 546
05-29 56° 64° 3494 2520 1573 899 550
05-30 54° 77° 3537 2553 1596 914 561
05-31 56° 82° 3584 2590 1623 933 575
06-01 63° 85° 3636 2632 1655 957 594
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 64° 89° 3691 2677 1690 984 615
06-03 69° 87° 3747 2723 1726 1012 638
06-04 67° 72° 3794 2760 1753 1031 652
06-05 65° 74° 3842 2797 1780 1051 667
06-06 66° 73° 3889 2835 1808 1070 682
06-07 64° 77° 3938 2874 1837 1091 697
06-08 61° 84° 3988 2914 1867 1113 714
06-09 60° 81° 4036 2952 1895 1133 730
06-10 57° 81° 4083 2989 1922 1152 743
06-11 60° 86° 4134 3030 1953 1175 761
06-12 69° 79° 4186 3072 1985 1199 780
06-13 69° 75° 4236 3112 2015 1221 797
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 69° 83° 4290 3156 2049 1247 818
06-15 66° 81° 4342 3197 2080 1271 837
06-16 68° 85° 4396 3242 2115 1297 859
06-17 68° 87° 4452 3288 2151 1325 881
06-18 70° 83° 4507 3332 2185 1352 903
06-19 66° 85° 4560 3376 2219 1377 923
06-20 67° 92° 4617 3423 2256 1406 947
06-21 77° 93° 4680 3476 2299 1441 978
06-22 75° 93° 4742 3528 2341 1475 1007
06-23 75° 92° 4804 3580 2383 1509 1035
06-24 75° 91° 4865 3631 2424 1542 1063
06-25 75° 92° 4927 3683 2466 1576 1092
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 75° 92° 4988 3734 2507 1609 1120
06-27 72° 88° 5046 3782 2545 1639 1145
06-28 71° 86° 5103 3829 2582 1668 1169
06-29 71° 76° 5155 3870 2613 1692 1188
06-30 70° 80° 5208 3914 2647 1717 1208
07-01 66° 85° 5262 3957 2680 1743 1229
07-02 66° 87° 5316 4002 2715 1769 1251
07-03 67° 89° 5373 4049 2752 1798 1274
07-04 70° 90° 5431 4096 2789 1828 1299
07-05 72° 88° 5489 4145 2828 1858 1324
07-06 70° 85° 5545 4191 2864 1886 1347
07-07 68° 87° 5600 4236 2899 1913 1370
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 69° 87° 5656 4282 2935 1941 1393
07-09 68° 88° 5712 4328 2971 1969 1416
07-10 69° 90° 5770 4376 3009 1999 1440
07-11 72° 92° 5830 4426 3049 2031 1467
07-12 70° 86° 5886 4472 3085 2059 1490
07-13 73° 80° 5940 4516 3119 2085 1512
07-14 70° 87° 5997 4563 3156 2114 1535
07-15 72° 88° 6055 4611 3194 2144 1560
07-16 73° 92° 6115 4661 3234 2176 1588
07-17 74° 86° 6173 4709 3272 2206 1612
07-18 71° 88° 6231 4756 3309 2236 1637
07-19 74° 92° 6292 4808 3351 2269 1665
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 76° 93° 6355 4860 3393 2304 1695
07-21 71° 87° 6411 4907 3430 2332 1719
07-22 75° 93° 6473 4959 3472 2366 1748
07-23 75° 94° 6536 5012 3515 2401 1777
07-24 73° 94° 6597 5063 3556 2434 1806
07-25 72° 94° 6658 5114 3597 2467 1834
07-26 76° 93° 6721 5167 3640 2502 1863
07-27 76° 93° 6783 5219 3682 2536 1893
07-28 77° 94° 6847 5273 3726 2572 1923
07-29 77° 95° 6910 5326 3769 2607 1954
07-30 76° 89° 6971 5377 3810 2640 1982
07-31 69° 76° 7022 5418 3841 2663 1999
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 62° 80° 7071 5457 3870 2684 2015
08-02 60° 78° 7118 5494 3897 2703 2029
08-03 56° 79° 7163 5529 3922 2720 2042
08-04 59° 83° 7212 5568 3951 2741 2058
08-05 63° 85° 7264 5610 3983 2765 2077
08-06 66° 89° 7320 5656 4019 2793 2099
08-07 71° 87° 7377 5702 4055 2822 2123
08-08 72° 95° 7438 5754 4097 2855 2151
08-09 75° 93° 7500 5806 4139 2889 2180
08-10 74° 86° 7558 5854 4177 2919 2206
08-11 71° 90° 7617 5903 4216 2950 2231
08-12 71° 88° 7674 5950 4253 2979 2256
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 70° 89° 7731 5997 4290 3008 2280
08-14 68° 91° 7789 6045 4328 3038 2305
08-15 71° 98° 7852 6097 4370 3073 2334
08-16 75° 98° 7916 6152 4415 3109 2365
08-17 74° 96° 7979 6205 4458 3144 2395
08-18 73° 97° 8042 6258 4501 3179 2425
08-19 73° 94° 8103 6309 4542 3212 2454
08-20 70° 88° 8160 6356 4579 3241 2478
08-21 68° 83° 8214 6400 4613 3267 2498
08-22 61° 86° 8265 6441 4644 3290 2516
08-23 64° 85° 8318 6484 4677 3315 2536
08-24 57° 79° 8364 6520 4703 3333 2549
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 53° 74° 8405 6551 4724 3346 2557
08-26 49° 79° 8447 6583 4746 3360 2567
08-27 52° 81° 8492 6618 4771 3377 2578
08-28 56° 82° 8539 6655 4798 3396 2592
08-29 55° 86° 8588 6693 4826 3417 2608
08-30 60° 87° 8639 6735 4858 3440 2627
08-31 69° 78° 8691 6777 4890 3464 2645
09-01 63° 82° 8741 6817 4920 3486 2662
09-02 62° 80° 8790 6856 4949 3507 2678
09-03 61° 86° 8841 6897 4980 3530 2697
09-04 57° 75° 8885 6931 5004 3546 2708
09-05 57° 69° 8927 6962 5025 3560 2716
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 50° 77° 8968 6994 5047 3573 2724
09-07 47° 76° 9007 7023 5066 3584 2730
09-08 48° 78° 9048 7054 5087 3597 2739
09-09 55° 81° 9094 7090 5113 3615 2752
09-10 61° 86° 9146 7132 5145 3639 2771
09-11 63° 92° 9202 7178 5181 3667 2793
09-12 64° 96° 9260 7226 5219 3697 2818
09-13 66° 96° 9319 7275 5258 3728 2844
09-14 68° 95° 9378 7324 5297 3759 2871
09-15 70° 92° 9437 7373 5336 3790 2897
09-16 65° 92° 9494 7420 5373 3819 2920
09-17 63° 93° 9550 7466 5409 3847 2943
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 66° 86° 9604 7510 5443 3873 2964
09-19 62° 83° 9654 7550 5473 3895 2982
09-20 62° 86° 9706 7592 5505 3919 3001
09-21 67° 85° 9760 7636 5539 3945 3021
09-22 63° 80° 9810 7675 5568 3967 3038
09-23 65° 72° 9856 7712 5595 3985 3052
09-24 66° 72° 9903 7749 5622 4004 3065
09-25 59° 79° 9950 7786 5649 4023 3080
09-26 56° 83° 9997 7823 5676 4042 3094
09-27 56° 84° 10000 7861 5704 4062 3109
09-28 56° 87° 10000 7901 5734 4084 3125
09-29 56° 87° 10000 7940 5763 4105 3142
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 58° 87° 10000 7981 5794 4128 3159
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 39° 51° 23 13 3 0 0
02-16 24° 39° 33 13 3 0 0
02-17 13° 26° 33 13 3 0 0
02-18 21° 50° 47 17 3 0 0
02-19 26° 57° 66 26 3 0 0
02-20 33° 66° 93 43 11 0 0
02-21 39° 71° 126 66 24 5 0
02-22 48° 67° 162 92 40 13 3
02-23 37° 63° 191 111 48 13 3
02-24 31° 52° 210 120 48 13 3
02-25 41° 74° 245 145 63 21 5
02-26 40° 80° 283 173 81 31 11
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 44° 81° 324 204 102 43 18
02-28 19° 39° 331 204 102 43 18
02-29 21° 54° 347 210 102 43 18
03-01 35° 52° 368 221 103 43 18
03-02 32° 70° 397 240 112 45 18
03-03 54° 82° 443 276 139 63 31
03-04 58° 80° 490 313 165 81 45
03-05 46° 67° 524 337 180 88 46
03-06 41° 62° 554 357 189 89 46
03-07 41° 54° 579 372 195 89 46
03-08 41° 54° 605 388 200 89 46
03-09 35° 49° 625 398 201 89 46
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 30° 56° 646 409 201 89 46
03-11 37° 68° 677 430 212 92 46
03-12 45° 74° 714 457 230 101 51
03-13 52° 76° 756 489 252 116 60
03-14 57° 77° 801 524 277 132 72
03-15 47° 62° 834 547 289 137 72
03-16 38° 66° 864 567 299 139 72
03-17 34° 51° 885 578 300 139 72
03-18 27° 37° 895 578 300 139 72
03-19 28° 67° 920 593 306 139 72
03-20 39° 58° 947 610 312 139 72
03-21 34° 63° 973 626 318 139 72
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 38° 67° 1003 646 328 142 72
03-23 35° 49° 1023 656 328 142 72
03-24 40° 68° 1055 678 341 146 72
03-25 51° 59° 1088 701 354 151 72
03-26 36° 50° 1109 712 355 151 72
03-27 30° 51° 1128 721 355 151 72
03-28 32° 64° 1153 737 361 151 72
03-29 42° 74° 1190 763 377 159 75
03-30 61° 75° 1236 799 403 177 89
03-31 58° 79° 1283 836 430 196 102
04-01 63° 73° 1329 872 456 214 115
04-02 44° 62° 1360 893 467 217 115
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 40° 52° 1384 907 471 217 115
04-04 39° 52° 1407 920 474 217 115
04-05 33° 56° 1430 933 477 217 115
04-06 39° 65° 1460 953 487 219 115
04-07 53° 74° 1502 985 509 233 124
04-08 48° 78° 1543 1016 530 246 132
04-09 52° 68° 1581 1044 548 256 137
04-10 53° 62° 1617 1070 564 264 140
04-11 53° 65° 1654 1097 581 273 144
04-12 47° 68° 1689 1122 596 280 146
04-13 43° 85° 1731 1154 618 294 155
04-14 60° 86° 1782 1195 649 317 173
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 61° 81° 1831 1234 678 338 189
04-16 68° 76° 1881 1274 708 360 206
04-17 61° 80° 1929 1312 736 380 221
04-18 54° 81° 1975 1348 762 398 234
04-19 43° 62° 2005 1369 773 401 234
04-20 43° 58° 2034 1387 781 401 234
04-21 39° 51° 2057 1400 784 401 234
04-22 35° 70° 2087 1420 794 403 234
04-23 51° 64° 2123 1446 810 410 237
04-24 47° 71° 2159 1472 826 419 240
04-25 48° 63° 2193 1496 840 425 241
04-26 53° 66° 2230 1524 858 434 246
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 62° 74° 2276 1560 884 452 259
04-28 63° 72° 2322 1595 909 470 271
04-29 59° 76° 2368 1631 935 488 284
04-30 52° 85° 2414 1667 961 506 297
05-01 66° 79° 2465 1708 992 529 315
05-02 62° 84° 2516 1749 1023 551 333
05-03 60° 73° 2560 1783 1047 568 344
05-04 61° 80° 2609 1822 1076 589 360
05-05 51° 65° 2645 1848 1092 597 363
05-06 60° 78° 2692 1885 1119 616 377
05-07 62° 81° 2741 1924 1148 637 393
05-08 53° 69° 2780 1954 1168 648 400
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 57° 74° 2824 1987 1191 664 410
05-10 55° 71° 2865 2018 1212 677 418
05-11 53° 77° 2908 2051 1235 692 428
05-12 52° 82° 2954 2087 1261 710 441
05-13 65° 72° 3000 2123 1287 728 454
05-14 63° 73° 3046 2159 1313 746 467
05-15 63° 74° 3092 2196 1340 764 481
05-16 63° 73° 3139 2232 1366 782 494
05-17 63° 81° 3188 2272 1396 804 511
05-18 60° 85° 3239 2312 1426 827 528
05-19 65° 88° 3294 2357 1461 854 550
05-20 69° 86° 3350 2403 1497 882 573
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 69° 89° 3407 2450 1534 911 597
05-22 58° 74° 3451 2484 1558 927 608
05-23 60° 82° 3499 2523 1587 947 624
05-24 69° 86° 3555 2568 1622 975 646
05-25 57° 80° 3602 2605 1649 994 660
05-26 64° 81° 3652 2646 1680 1016 678
05-27 62° 80° 3701 2684 1708 1037 693
05-28 58° 80° 3748 2721 1735 1056 707
05-29 59° 77° 3794 2757 1761 1074 720
05-30 57° 80° 3841 2794 1788 1093 734
05-31 61° 78° 3889 2832 1816 1113 749
06-01 65° 78° 3938 2871 1845 1134 765
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 64° 83° 3990 2913 1877 1158 784
06-03 69° 85° 4045 2958 1912 1185 806
06-04 68° 83° 4098 3001 1945 1210 826
06-05 68° 80° 4150 3044 1978 1234 846
06-06 63° 83° 4201 3084 2008 1257 863
06-07 57° 89° 4252 3125 2039 1280 881
06-08 67° 86° 4307 3170 2074 1307 903
06-09 62° 78° 4355 3208 2102 1327 918
06-10 58° 77° 4401 3244 2128 1345 931
06-11 57° 81° 4448 3281 2155 1364 945
06-12 63° 88° 4501 3324 2188 1389 965
06-13 69° 91° 4559 3373 2227 1419 991
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 71° 89° 4617 3421 2265 1449 1016
06-15 64° 91° 4673 3466 2300 1477 1038
06-16 74° 92° 4734 3517 2341 1510 1066
06-17 75° 94° 4796 3569 2383 1544 1095
06-18 74° 90° 4856 3619 2423 1576 1122
06-19 71° 89° 4914 3667 2461 1606 1147
06-20 71° 90° 4973 3716 2500 1637 1173
06-21 70° 91° 5032 3765 2539 1668 1199
06-22 72° 92° 5092 3815 2579 1700 1226
06-23 78° 91° 5155 3868 2622 1734 1256
06-24 69° 97° 5216 3919 2663 1768 1284
06-25 70° 96° 5277 3970 2704 1801 1312
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 67° 84° 5331 4014 2738 1827 1333
06-27 66° 87° 5385 4058 2772 1853 1354
06-28 70° 86° 5441 4104 2808 1881 1377
06-29 72° 92° 5501 4154 2848 1913 1404
06-30 69° 81° 5554 4197 2881 1938 1424
07-01 64° 74° 5601 4234 2908 1957 1438
07-02 66° 92° 5658 4281 2945 1986 1462
07-03 74° 84° 5715 4328 2982 2015 1486
07-04 70° 88° 5772 4375 3019 2044 1510
07-05 71° 82° 5827 4420 3054 2071 1532
07-06 64° 86° 5880 4463 3087 2096 1552
07-07 66° 88° 5935 4508 3122 2123 1574
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 67° 85° 5989 4552 3156 2149 1595
07-09 67° 72° 6036 4590 3184 2168 1610
07-10 66° 86° 6091 4634 3218 2194 1631
07-11 66° 85° 6144 4678 3252 2220 1652
07-12 72° 89° 6203 4726 3290 2251 1677
07-13 74° 86° 6261 4774 3328 2281 1702
07-14 74° 92° 6322 4825 3369 2314 1730
07-15 77° 95° 6385 4878 3412 2349 1760
07-16 71° 85° 6442 4925 3449 2377 1784
07-17 72° 84° 6497 4970 3484 2405 1806
07-18 63° 79° 6546 5009 3513 2426 1822
07-19 60° 80° 6594 5047 3541 2446 1837
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 60° 79° 6641 5084 3568 2465 1851
07-21 66° 77° 6691 5124 3598 2487 1868
07-22 65° 82° 6743 5166 3630 2511 1887
07-23 67° 87° 6798 5211 3665 2538 1909
07-24 67° 89° 6854 5257 3701 2565 1932
07-25 70° 90° 6911 5305 3739 2595 1957
07-26 71° 88° 6969 5352 3776 2625 1981
07-27 70° 82° 7023 5396 3810 2651 2002
07-28 70° 85° 7078 5441 3845 2678 2024
07-29 76° 95° 7141 5495 3889 2713 2055
07-30 77° 93° 7204 5547 3931 2748 2084
07-31 76° 94° 7267 5600 3974 2783 2114
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 74° 92° 7329 5652 4016 2816 2143
08-02 73° 87° 7386 5700 4054 2846 2168
08-03 70° 91° 7445 5748 4092 2877 2193
08-04 71° 94° 7506 5799 4133 2909 2221
08-05 72° 94° 7567 5850 4174 2943 2249
08-06 69° 88° 7623 5896 4210 2971 2272
08-07 67° 78° 7674 5937 4241 2994 2290
08-08 62° 82° 7724 5977 4271 3015 2307
08-09 62° 76° 7771 6014 4298 3034 2321
08-10 56° 78° 7815 6049 4323 3051 2333
08-11 64° 79° 7865 6088 4352 3073 2349
08-12 68° 73° 7913 6126 4380 3093 2364
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 67° 76° 7963 6166 4410 3115 2381
08-14 71° 83° 8018 6211 4445 3142 2403
08-15 73° 90° 8077 6260 4484 3173 2429
08-16 72° 92° 8137 6310 4524 3205 2456
08-17 72° 88° 8195 6358 4562 3235 2481
08-18 68° 84° 8249 6402 4596 3261 2502
08-19 65° 83° 8301 6444 4628 3285 2521
08-20 61° 78° 8349 6482 4656 3305 2536
08-21 62° 75° 8395 6518 4682 3323 2549
08-22 54° 77° 8439 6552 4706 3339 2560
08-23 55° 86° 8487 6590 4734 3359 2575
08-24 69° 81° 8540 6634 4768 3384 2596
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 69° 92° 8599 6682 4806 3415 2621
08-26 72° 94° 8660 6733 4847 3448 2649
08-27 75° 96° 8723 6787 4891 3483 2680
08-28 74° 86° 8781 6835 4929 3513 2705
08-29 71° 93° 8841 6885 4969 3545 2732
08-30 73° 90° 8901 6934 5008 3577 2758
08-31 71° 81° 8955 6978 5042 3603 2779
09-01 66° 86° 9009 7023 5077 3629 2801
09-02 58° 78° 9056 7059 5103 3647 2814
09-03 58° 77° 9101 7094 5128 3665 2826
09-04 53° 84° 9148 7131 5155 3684 2840
09-05 61° 89° 9201 7174 5188 3709 2860
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 64° 79° 9250 7213 5217 3730 2876
09-07 51° 73° 9290 7244 5238 3742 2884
09-08 44° 73° 9327 7270 5254 3751 2887
09-09 46° 80° 9368 7301 5275 3764 2895
09-10 47° 84° 9411 7334 5298 3779 2905
09-11 56° 87° 9461 7374 5328 3801 2922
09-12 61° 83° 9511 7414 5358 3822 2939
09-13 66° 72° 9557 7451 5385 3841 2953
09-14 69° 85° 9612 7495 5419 3868 2974
09-15 66° 85° 9666 7539 5453 3894 2995
09-16 68° 84° 9719 7582 5486 3919 3015
09-17 62° 88° 9772 7626 5520 3944 3036
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 62° 88° 9825 7668 5552 3969 3055
09-19 62° 92° 9880 7713 5587 3996 3077
09-20 70° 94° 9940 7764 5628 4028 3105
09-21 71° 86° 9997 7810 5664 4057 3128
09-22 69° 81° 10000 7853 5697 4082 3148
09-23 64° 71° 10000 7889 5723 4100 3161
09-24 61° 71° 10000 7923 5747 4116 3172
09-25 56° 77° 10000 7958 5772 4133 3184
09-26 56° 78° 10000 7993 5797 4150 3196
09-27 61° 69° 10000 8026 5820 4165 3206
09-28 63° 75° 10000 8062 5846 4183 3219
09-29 61° 79° 10000 8101 5875 4204 3235
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 60° 84° 10000 8141 5905 4225 3252

 

Latest Updates

February 15th, 2025Welcome to the 2025 GDD Tracking Season

Although winter seems very much entrenched in the Great Lakes region with snow and frigid temperatures in the forecast, GDDTracker starts counting on February 15. Spring is when GDDTracker receives the most attention for alerting turfgrass managers of optimal application timing windows for suppressing annual bluegrass seedheads and crabgrass preemergence applications. Beyond the spring models, there are several models that may be helpful throughout the season including the early season dollar spot DMI timer and the Smith-Kerns dollar spot prediction model. To learn about all the available models, click on the "About" tab at the top of the screen. Thanks for your continued support and use of GDDTracker and best wishes for a successful 2025!
 

March 18th, 2024Timing crabgrass preemergence applications in spring

Don't miss this update from from Kevin Frank regarding timing of crabgrass preemergence herbicides.


 

 

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