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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Crabgrass/Annual Bluegrass Preemergence Timer (GDD 32)
through Sun, Dec. 14. 2025

 
  

East Brunswick, NJ

        

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 26° 37° 10 0 0 0 0
02-16 35° 50° 30 10 0 0 0
02-17 28° 35° 40 10 0 0 0
02-18 19° 27° 41 10 0 0 0
02-19 16° 30° 42 10 0 0 0
02-20 16° 28° 42 10 0 0 0
02-21 21° 35° 48 10 0 0 0
02-22 20° 40° 56 10 0 0 0
02-23 28° 47° 71 16 0 0 0
02-24 29° 54° 91 25 0 0 0
02-25 39° 59° 118 43 8 0 0
02-26 36° 57° 143 58 13 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 44° 54° 170 75 20 0 0
02-28 38° 51° 192 87 22 0 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 30° 64° 217 102 27 0 0
03-02 20° 36° 223 102 27 0 0
03-03 19° 39° 230 102 27 0 0
03-04 28° 56° 250 112 27 0 0
03-05 42° 61° 280 132 37 2 0
03-06 36° 57° 304 146 41 2 0
03-07 33° 50° 324 156 41 2 0
03-08 35° 47° 343 165 41 2 0
03-09 30° 54° 363 175 41 2 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 39° 66° 393 195 51 4 0
03-11 35° 68° 422 214 61 5 0
03-12 40° 53° 447 229 65 5 0
03-13 37° 47° 467 239 65 5 0
03-14 40° 55° 492 254 71 5 0
03-15 41° 51° 516 268 74 5 0
03-16 47° 69° 552 294 90 13 3
03-17 38° 64° 581 313 99 14 3
03-18 33° 62° 606 328 104 14 3
03-19 34° 64° 633 345 112 14 3
03-20 42° 57° 661 363 119 14 3
03-21 38° 52° 684 376 123 14 3
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 35° 62° 711 393 129 14 3
03-23 31° 48° 729 400 129 14 3
03-24 39° 52° 752 414 133 14 3
03-25 42° 59° 781 433 141 15 3
03-26 38° 52° 804 446 145 15 3
03-27 31° 52° 823 455 145 15 3
03-28 38° 65° 853 475 154 16 3
03-29 42° 82° 893 505 174 28 10
03-30 43° 50° 917 519 179 28 10
03-31 46° 79° 958 550 199 41 17
04-01 41° 60° 986 568 208 41 17
04-02 35° 47° 1005 577 208 41 17
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 45° 74° 1043 605 225 51 22
04-04 57° 72° 1085 637 248 65 31
04-05 45° 56° 1114 656 257 66 31
04-06 44° 56° 1142 674 265 66 31
04-07 40° 51° 1166 688 268 66 31
04-08 37° 46° 1185 697 268 66 31
04-09 31° 49° 1203 705 268 66 31
04-10 36° 51° 1225 717 269 66 31
04-11 41° 45° 1246 728 270 66 31
04-12 37° 41° 1263 735 270 66 31
04-13 39° 57° 1289 751 277 66 31
04-14 39° 67° 1320 772 288 69 31
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 50° 69° 1358 800 305 79 36
04-16 45° 52° 1384 816 312 79 36
04-17 40° 63° 1414 836 322 81 36
04-18 36° 70° 1445 857 333 84 36
04-19 59° 83° 1494 896 362 105 52
04-20 53° 73° 1535 927 383 118 60
04-21 46° 58° 1565 947 393 120 60
04-22 51° 78° 1608 980 416 135 70
04-23 53° 74° 1650 1012 438 149 79
04-24 49° 80° 1692 1044 460 163 88
04-25 52° 79° 1736 1077 483 178 99
04-26 58° 72° 1779 1111 507 194 109
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 48° 64° 1813 1134 520 199 110
04-28 45° 74° 1850 1162 538 209 114
04-29 48° 80° 1893 1194 560 223 124
04-30 58° 75° 1937 1229 585 240 135
05-01 47° 70° 1974 1255 601 248 139
05-02 55° 84° 2021 1293 629 268 153
05-03 60° 85° 2072 1334 659 290 171
05-04 62° 71° 2117 1368 684 307 183
05-05 58° 63° 2155 1397 703 318 188
05-06 58° 73° 2198 1430 726 333 198
05-07 55° 75° 2242 1463 749 348 209
05-08 55° 78° 2286 1498 774 365 220
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 52° 61° 2321 1523 789 372 222
05-10 49° 74° 2360 1552 808 383 228
05-11 48° 78° 2402 1583 829 396 237
05-12 48° 77° 2442 1614 850 409 244
05-13 59° 68° 2484 1646 871 422 253
05-14 59° 63° 2523 1675 890 433 259
05-15 60° 69° 2565 1707 913 448 268
05-16 63° 75° 2612 1744 940 467 282
05-17 63° 85° 2664 1786 972 491 301
05-18 62° 74° 2710 1822 998 509 314
05-19 58° 71° 2753 1854 1020 523 324
05-20 46° 69° 2788 1880 1035 530 326
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 50° 55° 2819 1900 1046 533 326
05-22 50° 52° 2848 1920 1055 534 326
05-23 49° 65° 2883 1944 1070 541 328
05-24 48° 65° 2917 1969 1085 548 329
05-25 50° 69° 2954 1996 1102 557 333
05-26 49° 73° 2993 2025 1121 568 339
05-27 50° 74° 3033 2055 1140 579 346
05-28 53° 61° 3068 2080 1156 587 348
05-29 55° 69° 3108 2110 1176 599 355
05-30 59° 76° 3154 2145 1201 616 368
05-31 56° 69° 3194 2176 1222 629 375
06-01 48° 68° 3230 2202 1237 636 378
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 47° 73° 3268 2229 1255 646 383
06-03 51° 81° 3312 2264 1280 663 394
06-04 54° 87° 3360 2302 1308 683 409
06-05 65° 88° 3415 2346 1342 709 431
06-06 66° 89° 3470 2392 1378 737 453
06-07 68° 79° 3522 2434 1409 760 472
06-08 63° 73° 3568 2470 1435 778 485
06-09 61° 66° 3609 2501 1457 792 493
06-10 62° 80° 3658 2540 1486 813 509
06-11 62° 84° 3710 2581 1517 836 528
06-12 66° 91° 3766 2628 1554 865 551
06-13 67° 77° 3816 2668 1584 887 568
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 60° 67° 3858 2700 1606 901 577
06-15 59° 62° 3896 2728 1624 911 582
06-16 60° 64° 3936 2758 1644 923 589
06-17 61° 71° 3980 2792 1668 939 601
06-18 67° 86° 4035 2837 1702 965 622
06-19 71° 91° 4094 2885 1741 996 648
06-20 67° 84° 4147 2929 1775 1022 668
06-21 70° 90° 4205 2977 1812 1051 693
06-22 74° 90° 4265 3026 1852 1083 720
06-23 78° 97° 4330 3082 1898 1121 752
06-24 78° 101° 4398 3140 1945 1160 787
06-25 78° 98° 4464 3195 1991 1198 820
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 67° 85° 4518 3239 2025 1224 841
06-27 64° 69° 4562 3274 2050 1241 852
06-28 64° 88° 4616 3318 2084 1267 873
06-29 75° 91° 4677 3369 2125 1300 901
06-30 72° 92° 4737 3419 2164 1331 928
07-01 73° 89° 4796 3468 2204 1363 954
07-02 71° 86° 4852 3514 2240 1391 978
07-03 67° 89° 4909 3560 2276 1419 1001
07-04 64° 82° 4960 3601 2307 1442 1019
07-05 62° 86° 5011 3643 2339 1466 1038
07-06 67° 89° 5068 3689 2375 1494 1061
07-07 74° 88° 5127 3738 2414 1525 1087
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 74° 95° 5189 3791 2457 1560 1116
07-09 73° 90° 5249 3841 2496 1591 1143
07-10 68° 81° 5301 3883 2529 1616 1162
07-11 71° 84° 5357 3929 2565 1644 1185
07-12 71° 85° 5413 3975 2601 1672 1208
07-13 72° 84° 5469 4021 2636 1699 1231
07-14 73° 89° 5528 4069 2675 1730 1257
07-15 73° 86° 5585 4117 2712 1759 1281
07-16 74° 89° 5645 4166 2752 1791 1308
07-17 75° 91° 5705 4217 2793 1824 1335
07-18 70° 82° 5759 4261 2827 1850 1356
07-19 69° 79° 5811 4303 2858 1873 1375
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 74° 88° 5870 4352 2897 1904 1401
07-21 69° 85° 5925 4397 2933 1932 1423
07-22 64° 78° 5974 4436 2962 1953 1439
07-23 63° 82° 6025 4476 2992 1975 1457
07-24 64° 88° 6079 4520 3026 2001 1478
07-25 72° 94° 6140 4572 3067 2034 1506
07-26 74° 82° 6196 4618 3103 2062 1529
07-27 70° 86° 6252 4664 3140 2091 1552
07-28 74° 92° 6313 4715 3181 2124 1580
07-29 74° 96° 6376 4768 3224 2159 1610
07-30 75° 96° 6440 4821 3267 2194 1641
07-31 68° 91° 6497 4869 3305 2224 1665
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 64° 72° 6543 4904 3330 2241 1678
08-02 60° 77° 6589 4941 3357 2260 1692
08-03 58° 81° 6637 4979 3384 2279 1706
08-04 58° 86° 6687 5019 3415 2302 1723
08-05 63° 84° 6738 5060 3446 2325 1741
08-06 69° 75° 6788 5100 3476 2347 1759
08-07 64° 78° 6838 5139 3505 2368 1775
08-08 58° 79° 6884 5176 3531 2386 1788
08-09 55° 82° 6930 5212 3558 2405 1801
08-10 57° 87° 6980 5252 3588 2427 1818
08-11 62° 87° 7033 5294 3620 2451 1838
08-12 64° 90° 7088 5339 3655 2478 1860
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 71° 92° 7147 5389 3695 2510 1886
08-14 71° 87° 7204 5436 3732 2539 1910
08-15 72° 86° 7261 5483 3769 2568 1934
08-16 72° 85° 7318 5529 3805 2596 1958
08-17 69° 92° 7376 5578 3844 2627 1983
08-18 65° 74° 7424 5615 3871 2646 1998
08-19 63° 74° 7470 5652 3897 2664 2011
08-20 62° 70° 7514 5686 3921 2680 2022
08-21 61° 72° 7558 5720 3946 2697 2033
08-22 57° 83° 7606 5758 3973 2716 2048
08-23 59° 82° 7654 5796 4002 2737 2063
08-24 59° 81° 7703 5835 4030 2757 2079
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 66° 85° 7756 5878 4064 2783 2099
08-26 57° 79° 7802 5914 4090 2801 2112
08-27 57° 75° 7846 5948 4114 2817 2123
08-28 50° 78° 7888 5980 4136 2831 2132
08-29 59° 77° 7934 6016 4162 2849 2146
08-30 53° 76° 7977 6048 4184 2863 2155
08-31 50° 78° 8019 6081 4207 2878 2164
09-01 54° 78° 8063 6115 4231 2894 2175
09-02 55° 75° 8106 6148 4254 2909 2185
09-03 53° 78° 8150 6181 4277 2924 2196
09-04 56° 82° 8196 6218 4304 2943 2210
09-05 65° 87° 8250 6262 4338 2969 2231
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 69° 88° 8307 6309 4375 2998 2254
09-07 61° 70° 8351 6342 4398 3013 2265
09-08 52° 73° 8391 6373 4419 3026 2272
09-09 52° 72° 8431 6403 4439 3038 2279
09-10 62° 71° 8475 6437 4463 3054 2291
09-11 57° 80° 8522 6474 4490 3073 2304
09-12 56° 78° 8567 6509 4514 3089 2316
09-13 56° 79° 8613 6544 4540 3107 2329
09-14 61° 81° 8662 6584 4569 3128 2345
09-15 60° 78° 8709 6621 4596 3147 2359
09-16 63° 72° 8754 6656 4622 3165 2371
09-17 63° 68° 8798 6689 4645 3180 2382
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 64° 84° 8850 6732 4677 3204 2401
09-19 61° 85° 8900 6772 4708 3227 2419
09-20 59° 71° 8944 6805 4731 3242 2429
09-21 53° 70° 8983 6835 4751 3254 2435
09-22 49° 74° 9023 6864 4770 3265 2442
09-23 60° 85° 9073 6905 4801 3288 2459
09-24 66° 80° 9124 6945 4831 3310 2477
09-25 71° 81° 9178 6989 4865 3336 2498
09-26 66° 82° 9230 7031 4897 3360 2517
09-27 62° 79° 9278 7070 4926 3381 2532
09-28 63° 85° 9330 7112 4958 3405 2551
09-29 64° 76° 9378 7150 4986 3425 2566
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 61° 80° 9427 7188 5014 3445 2582
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 20° 37° 6 0 0 0 0
02-16 34° 41° 22 5 0 0 0
02-17 25° 35° 30 5 0 0 0
02-18 19° 41° 37 5 0 0 0
02-19 28° 40° 50 8 0 0 0
02-20 24° 38° 59 8 0 0 0
02-21 23° 41° 69 8 0 0 0
02-22 27° 47° 84 13 0 0 0
02-23 40° 47° 105 24 2 0 0
02-24 30° 42° 119 29 2 0 0
02-25 21° 40° 128 29 2 0 0
02-26 30° 55° 149 39 2 0 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 35° 64° 176 57 10 0 0
02-28 45° 62° 208 78 22 4 0
02-29 31° 43° 223 83 22 4 0
03-01 26° 47° 237 88 22 4 0
03-02 40° 52° 261 102 25 4 0
03-03 47° 66° 295 126 40 10 1
03-04 43° 59° 324 145 49 11 1
03-05 42° 47° 347 157 51 11 1
03-06 47° 49° 373 173 57 11 1
03-07 46° 55° 401 192 66 12 1
03-08 37° 53° 424 205 69 12 1
03-09 40° 49° 447 217 71 12 1
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 36° 49° 468 228 72 12 1
03-11 36° 54° 490 241 75 12 1
03-12 39° 66° 521 262 85 14 1
03-13 40° 70° 554 284 98 19 1
03-14 43° 74° 590 311 115 28 5
03-15 53° 72° 631 342 136 41 13
03-16 44° 59° 661 362 146 43 13
03-17 48° 61° 694 384 158 47 13
03-18 39° 51° 717 398 162 47 13
03-19 33° 45° 734 405 162 47 13
03-20 36° 58° 759 420 167 47 13
03-21 29° 42° 773 424 167 47 13
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 27° 44° 787 427 167 47 13
03-23 35° 53° 809 439 169 47 13
03-24 30° 48° 825 446 169 47 13
03-25 32° 51° 845 455 169 47 13
03-26 38° 53° 868 469 172 47 13
03-27 42° 50° 892 483 176 47 13
03-28 45° 50° 918 498 182 47 13
03-29 40° 55° 943 514 187 47 13
03-30 38° 60° 970 531 194 47 13
03-31 44° 59° 1000 550 203 49 13
04-01 46° 51° 1027 567 210 49 13
04-02 44° 48° 1050 581 214 49 13
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 42° 44° 1072 592 215 49 13
04-04 38° 51° 1094 604 217 49 13
04-05 40° 48° 1116 616 219 49 13
04-06 39° 53° 1140 630 223 49 13
04-07 39° 60° 1167 647 231 49 13
04-08 33° 64° 1194 664 237 49 13
04-09 45° 77° 1232 693 256 59 18
04-10 50° 65° 1268 719 272 67 21
04-11 50° 67° 1304 745 288 75 24
04-12 56° 65° 1343 774 307 86 30
04-13 47° 57° 1374 794 317 89 30
04-14 43° 74° 1410 821 334 97 34
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 56° 79° 1456 856 359 115 46
04-16 50° 68° 1493 884 377 124 51
04-17 46° 61° 1525 905 388 128 51
04-18 45° 49° 1550 920 394 128 51
04-19 41° 55° 1576 937 400 128 51
04-20 48° 68° 1612 963 416 136 54
04-21 38° 49° 1634 974 417 136 54
04-22 36° 61° 1660 991 424 136 54
04-23 36° 65° 1689 1009 432 136 54
04-24 48° 72° 1727 1037 450 146 59
04-25 41° 56° 1753 1054 457 146 59
04-26 34° 60° 1779 1069 462 146 59
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 36° 60° 1805 1085 468 146 59
04-28 49° 79° 1847 1117 490 160 68
04-29 60° 87° 1898 1159 522 184 87
04-30 54° 65° 1936 1186 540 194 91
05-01 54° 78° 1980 1220 563 210 102
05-02 54° 86° 2028 1258 592 230 117
05-03 47° 66° 2063 1283 606 236 119
05-04 45° 57° 2092 1303 616 238 119
05-05 49° 54° 2122 1322 625 239 119
05-06 54° 72° 2163 1353 647 253 127
05-07 59° 80° 2210 1391 674 272 142
05-08 65° 86° 2264 1434 707 297 162
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 59° 73° 2308 1468 731 313 173
05-10 49° 58° 2339 1489 743 317 173
05-11 45° 60° 2369 1510 753 319 173
05-12 47° 54° 2398 1528 761 319 173
05-13 42° 68° 2431 1551 774 324 173
05-14 49° 74° 2470 1581 794 336 180
05-15 59° 64° 2510 1611 814 348 186
05-16 60° 64° 2550 1641 834 360 193
05-17 59° 70° 2592 1673 856 374 202
05-18 57° 68° 2633 1703 876 386 210
05-19 58° 74° 2677 1737 900 402 221
05-20 51° 75° 2718 1768 921 415 229
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 54° 85° 2765 1806 949 435 244
05-22 61° 88° 2818 1848 981 459 263
05-23 67° 79° 2869 1889 1012 482 281
05-24 64° 86° 2921 1932 1045 507 301
05-25 61° 82° 2971 1971 1074 528 317
05-26 66° 83° 3023 2013 1107 553 336
05-27 68° 78° 3074 2054 1137 575 354
05-28 66° 82° 3126 2096 1169 599 373
05-29 58° 77° 3171 2132 1195 617 386
05-30 57° 72° 3214 2165 1218 632 395
05-31 55° 75° 3257 2198 1241 647 405
06-01 53° 83° 3303 2233 1267 665 418
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 59° 81° 3351 2271 1295 685 433
06-03 69° 86° 3406 2317 1330 712 455
06-04 64° 83° 3458 2358 1361 735 474
06-05 64° 83° 3509 2400 1393 759 492
06-06 71° 83° 3564 2445 1428 786 514
06-07 67° 84° 3617 2488 1461 811 535
06-08 59° 79° 3665 2525 1488 830 549
06-09 61° 76° 3711 2562 1515 849 563
06-10 58° 75° 3756 2597 1540 866 575
06-11 57° 74° 3799 2630 1563 881 585
06-12 60° 77° 3846 2666 1590 900 598
06-13 59° 86° 3897 2707 1620 922 616
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 67° 87° 3952 2752 1655 949 638
06-15 63° 81° 4002 2792 1685 971 655
06-16 59° 77° 4047 2828 1711 989 668
06-17 61° 87° 4100 2870 1743 1013 687
06-18 69° 91° 4158 2918 1781 1043 712
06-19 69° 91° 4215 2966 1819 1073 737
06-20 68° 92° 4274 3014 1857 1103 762
06-21 74° 95° 4336 3066 1899 1138 791
06-22 75° 95° 4399 3119 1942 1172 821
06-23 73° 95° 4461 3171 1984 1206 850
06-24 76° 80° 4517 3217 2020 1235 873
06-25 68° 90° 4574 3265 2058 1264 897
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 72° 94° 4635 3316 2099 1297 926
06-27 69° 85° 4691 3361 2134 1324 948
06-28 60° 79° 4738 3399 2162 1344 962
06-29 64° 84° 4790 3441 2194 1368 981
06-30 74° 85° 4848 3488 2232 1398 1006
07-01 62° 81° 4898 3528 2261 1419 1023
07-02 62° 84° 4949 3569 2292 1443 1041
07-03 61° 85° 5000 3611 2324 1466 1059
07-04 68° 90° 5057 3657 2361 1495 1083
07-05 74° 90° 5117 3708 2401 1527 1110
07-06 76° 92° 5179 3760 2443 1561 1139
07-07 76° 89° 5240 3810 2483 1593 1167
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 72° 93° 5300 3861 2524 1626 1195
07-09 74° 96° 5363 3914 2567 1661 1224
07-10 76° 93° 5425 3966 2609 1695 1253
07-11 75° 91° 5486 4017 2650 1728 1281
07-12 73° 81° 5541 4062 2685 1755 1303
07-13 74° 89° 5600 4111 2724 1786 1329
07-14 74° 89° 5660 4160 2763 1817 1356
07-15 74° 95° 5722 4212 2806 1852 1385
07-16 74° 98° 5786 4266 2849 1888 1416
07-17 73° 95° 5848 4318 2891 1921 1445
07-18 73° 85° 5904 4365 2928 1950 1468
07-19 66° 84° 5957 4407 2961 1975 1488
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 64° 83° 6008 4449 2992 1998 1506
07-21 67° 88° 6064 4494 3027 2026 1529
07-22 69° 84° 6118 4539 3062 2052 1551
07-23 71° 84° 6174 4584 3098 2080 1573
07-24 73° 82° 6229 4630 3133 2107 1595
07-25 73° 85° 6286 4677 3170 2136 1620
07-26 64° 83° 6338 4718 3201 2159 1638
07-27 63° 85° 6390 4760 3233 2183 1657
07-28 63° 87° 6443 4803 3266 2208 1677
07-29 69° 87° 6499 4850 3303 2237 1700
07-30 72° 88° 6557 4898 3341 2267 1725
07-31 75° 90° 6618 4948 3381 2299 1753
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 72° 96° 6680 5000 3423 2333 1782
08-02 75° 95° 6743 5053 3466 2368 1812
08-03 73° 91° 6803 5103 3506 2400 1839
08-04 72° 80° 6857 5147 3540 2427 1860
08-05 71° 92° 6916 5197 3580 2458 1887
08-06 72° 93° 6977 5247 3620 2491 1914
08-07 66° 73° 7025 5285 3648 2510 1929
08-08 67° 73° 7072 5323 3676 2530 1943
08-09 74° 84° 7129 5370 3713 2559 1967
08-10 73° 85° 7186 5417 3750 2588 1991
08-11 68° 81° 7239 5459 3782 2612 2011
08-12 60° 80° 7287 5497 3811 2633 2026
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 61° 81° 7336 5536 3839 2653 2042
08-14 63° 85° 7388 5578 3871 2677 2061
08-15 64° 86° 7441 5621 3904 2702 2081
08-16 65° 87° 7495 5665 3938 2728 2102
08-17 68° 80° 7547 5707 3970 2752 2121
08-18 71° 86° 7603 5754 4007 2781 2144
08-19 69° 84° 7657 5798 4041 2807 2166
08-20 60° 71° 7701 5832 4065 2823 2176
08-21 55° 72° 7743 5863 4086 2836 2185
08-22 53° 77° 7785 5896 4109 2851 2195
08-23 55° 81° 7832 5932 4135 2869 2208
08-24 58° 83° 7880 5971 4164 2890 2223
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 61° 85° 7931 6011 4194 2913 2241
08-26 64° 85° 7983 6054 4227 2937 2260
08-27 64° 86° 8036 6097 4260 2962 2280
08-28 70° 93° 8096 6146 4299 2994 2307
08-29 69° 77° 8147 6187 4330 3016 2325
08-30 64° 71° 8192 6223 4356 3034 2337
08-31 68° 79° 8244 6264 4387 3057 2356
09-01 70° 83° 8298 6309 4422 3084 2377
09-02 64° 78° 8347 6348 4451 3105 2393
09-03 53° 73° 8388 6379 4472 3118 2402
09-04 50° 76° 8429 6410 4493 3131 2410
09-05 51° 75° 8470 6441 4514 3144 2417
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 57° 75° 8514 6475 4538 3160 2429
09-07 58° 77° 8560 6511 4564 3178 2441
09-08 51° 70° 8599 6539 4582 3188 2447
09-09 47° 76° 8638 6568 4602 3200 2453
09-10 55° 79° 8683 6603 4626 3216 2465
09-11 54° 78° 8727 6637 4650 3232 2476
09-12 54° 79° 8771 6672 4675 3249 2487
09-13 54° 80° 8817 6707 4700 3266 2500
09-14 56° 83° 8864 6745 4728 3286 2514
09-15 59° 78° 8910 6781 4754 3304 2528
09-16 54° 72° 8951 6812 4775 3317 2536
09-17 62° 75° 8998 6848 4801 3335 2549
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 66° 75° 9046 6886 4830 3356 2564
09-19 63° 84° 9097 6928 4861 3379 2583
09-20 62° 81° 9147 6968 4891 3401 2599
09-21 60° 79° 9195 7005 4918 3421 2614
09-22 59° 74° 9239 7040 4943 3437 2626
09-23 58° 67° 9280 7070 4963 3449 2633
09-24 61° 67° 9321 7102 4985 3463 2642
09-25 63° 66° 9364 7135 5008 3478 2651
09-26 65° 78° 9414 7174 5037 3499 2668
09-27 65° 71° 9459 7210 5063 3517 2681
09-28 62° 67° 9502 7242 5085 3532 2690
09-29 61° 63° 9542 7272 5105 3544 2697
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 60° 70° 9585 7305 5128 3559 2707

 

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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