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Ester/Amine Spring Broadleaf Herbicide Timer - Purdue (GDD 50)
through Sat, Dec. 13. 2025

 
  

Mattoon, IL

        

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 32° 39° 14 4 0 0 0
02-16 18° 32° 16 4 0 0 0
02-17 8° 19° 16 4 0 0 0
02-18 4° 15° 16 4 0 0 0
02-19 7° 19° 16 4 0 0 0
02-20 2° 19° 16 4 0 0 0
02-21 6° 24° 16 4 0 0 0
02-22 14° 33° 18 4 0 0 0
02-23 23° 48° 31 7 0 0 0
02-24 33° 54° 53 19 2 0 0
02-25 37° 59° 79 35 8 0 0
02-26 35° 60° 104 50 13 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 35° 56° 128 64 17 0 0
02-28 34° 69° 157 83 26 1 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 22° 45° 169 85 26 1 0
03-02 16° 39° 174 85 26 1 0
03-03 27° 55° 194 94 26 1 0
03-04 50° 63° 228 119 41 8 2
03-05 32° 54° 249 130 42 8 2
03-06 29° 43° 263 133 42 8 2
03-07 33° 57° 286 146 45 8 2
03-08 29° 49° 303 154 45 8 2
03-09 32° 60° 327 167 49 8 2
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 36° 70° 358 188 60 11 2
03-11 46° 72° 395 215 77 20 6
03-12 36° 73° 428 238 90 25 6
03-13 44° 77° 466 267 108 35 11
03-14 55° 80° 512 302 133 53 23
03-15 53° 66° 549 329 151 62 28
03-16 29° 48° 566 336 151 62 28
03-17 24° 55° 583 344 151 62 28
03-18 44° 76° 621 372 169 72 33
03-19 45° 68° 656 396 183 78 34
03-20 33° 45° 673 403 183 78 34
03-21 27° 58° 694 414 184 78 34
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 37° 54° 717 427 187 78 34
03-23 40° 52° 741 441 191 78 34
03-24 36° 55° 765 455 195 78 34
03-25 39° 52° 788 469 199 78 34
03-26 34° 59° 813 483 203 78 34
03-27 44° 55° 840 500 210 78 34
03-28 50° 80° 883 533 233 94 44
03-29 61° 68° 926 566 256 108 54
03-30 51° 71° 965 595 275 119 60
03-31 38° 49° 986 606 276 119 60
04-01 32° 52° 1006 616 276 119 60
04-02 47° 78° 1047 647 297 132 68
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 50° 64° 1082 672 312 139 70
04-04 43° 54° 1108 689 318 139 70
04-05 45° 58° 1138 708 328 140 70
04-06 41° 48° 1160 721 330 140 70
04-07 34° 55° 1182 733 333 140 70
04-08 26° 45° 1196 736 333 140 70
04-09 34° 56° 1219 749 335 140 70
04-10 36° 63° 1246 766 343 140 70
04-11 41° 55° 1272 782 349 140 70
04-12 33° 60° 1297 797 353 140 70
04-13 47° 71° 1334 824 370 149 74
04-14 52° 69° 1372 853 389 160 79
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 44° 59° 1402 872 398 161 79
04-16 37° 65° 1430 891 407 162 79
04-17 47° 67° 1466 916 422 169 82
04-18 61° 77° 1512 953 449 188 95
04-19 54° 69° 1552 983 469 200 102
04-20 51° 75° 1593 1014 490 213 110
04-21 50° 66° 1629 1040 506 221 113
04-22 44° 72° 1665 1066 522 229 116
04-23 51° 76° 1707 1097 544 243 125
04-24 52° 80° 1751 1131 568 259 136
04-25 57° 74° 1795 1165 591 274 147
04-26 47° 60° 1826 1187 603 278 147
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 42° 64° 1858 1208 614 281 147
04-28 52° 82° 1903 1243 639 298 159
04-29 54° 76° 1946 1276 663 313 169
04-30 49° 69° 1983 1303 680 323 173
05-01 61° 71° 2027 1337 704 339 184
05-02 58° 67° 2068 1368 724 351 192
05-03 50° 58° 2099 1390 736 355 192
05-04 45° 49° 2124 1405 741 355 192
05-05 47° 61° 2156 1427 753 359 192
05-06 44° 70° 2191 1452 768 366 194
05-07 53° 75° 2233 1484 790 380 203
05-08 53° 69° 2272 1513 809 391 209
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 45° 71° 2308 1539 825 399 212
05-10 45° 79° 2349 1569 845 411 219
05-11 47° 80° 2390 1600 867 425 227
05-12 59° 72° 2433 1634 890 440 238
05-13 59° 79° 2480 1671 917 459 252
05-14 60° 83° 2530 1710 947 481 268
05-15 68° 89° 2586 1757 983 509 292
05-16 62° 84° 2637 1798 1014 532 310
05-17 56° 71° 2679 1829 1035 545 318
05-18 51° 76° 2720 1861 1057 559 327
05-19 55° 79° 2765 1896 1082 576 339
05-20 62° 77° 2813 1933 1110 596 353
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 56° 63° 2851 1961 1127 605 358
05-22 49° 58° 2882 1983 1139 609 358
05-23 45° 70° 2918 2008 1154 616 361
05-24 52° 71° 2958 2038 1174 628 368
05-25 54° 64° 2995 2065 1192 638 372
05-26 49° 72° 3034 2094 1210 648 377
05-27 59° 74° 3078 2128 1235 665 389
05-28 60° 69° 3121 2161 1257 679 399
05-29 53° 69° 3160 2190 1277 690 405
05-30 58° 77° 3206 2226 1302 708 417
05-31 59° 81° 3254 2264 1330 728 432
06-01 54° 76° 3297 2297 1353 743 443
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 53° 81° 3341 2332 1378 760 454
06-03 65° 85° 3394 2374 1411 785 474
06-04 69° 79° 3446 2417 1443 809 493
06-05 64° 73° 3493 2453 1470 828 507
06-06 64° 72° 3539 2489 1496 845 520
06-07 58° 76° 3584 2525 1521 863 532
06-08 64° 80° 3634 2565 1551 885 549
06-09 60° 79° 3682 2602 1578 904 564
06-10 55° 76° 3725 2636 1602 920 574
06-11 58° 84° 3774 2675 1631 941 590
06-12 63° 81° 3824 2715 1661 963 607
06-13 68° 77° 3875 2755 1692 985 625
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 70° 78° 3927 2797 1724 1010 644
06-15 66° 77° 3976 2837 1753 1031 660
06-16 69° 79° 4029 2879 1785 1055 679
06-17 69° 85° 4084 2924 1820 1082 701
06-18 73° 85° 4141 2971 1857 1111 725
06-19 68° 84° 4194 3015 1891 1137 746
06-20 65° 84° 4247 3057 1924 1162 766
06-21 74° 92° 4308 3108 1965 1195 794
06-22 74° 92° 4369 3160 2006 1228 822
06-23 74° 93° 4431 3211 2048 1261 851
06-24 76° 93° 4493 3264 2090 1296 880
06-25 76° 90° 4555 3315 2131 1329 908
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 74° 93° 4616 3366 2173 1363 937
06-27 75° 88° 4676 3416 2212 1394 963
06-28 72° 89° 4734 3465 2251 1425 989
06-29 72° 83° 4790 3510 2287 1453 1012
06-30 72° 87° 4848 3558 2324 1482 1036
07-01 70° 84° 4903 3603 2360 1510 1059
07-02 65° 86° 4957 3647 2393 1535 1079
07-03 69° 88° 5013 3694 2430 1564 1103
07-04 69° 90° 5071 3741 2467 1593 1127
07-05 70° 90° 5129 3789 2506 1624 1153
07-06 72° 88° 5187 3838 2544 1654 1178
07-07 71° 82° 5242 3882 2579 1681 1200
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 65° 86° 5296 3926 2612 1706 1220
07-09 70° 85° 5351 3972 2648 1734 1243
07-10 69° 88° 5408 4018 2685 1762 1267
07-11 71° 90° 5467 4067 2723 1793 1293
07-12 70° 83° 5521 4112 2758 1820 1314
07-13 69° 84° 5576 4156 2793 1847 1336
07-14 67° 84° 5630 4200 2826 1872 1357
07-15 71° 84° 5685 4245 2862 1900 1379
07-16 71° 89° 5743 4294 2900 1930 1404
07-17 71° 85° 5800 4340 2936 1958 1427
07-18 67° 83° 5853 4383 2970 1983 1448
07-19 72° 81° 5907 4428 3004 2010 1469
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 73° 84° 5963 4474 3040 2038 1492
07-21 72° 84° 6020 4520 3076 2066 1515
07-22 71° 87° 6077 4567 3113 2095 1539
07-23 73° 89° 6136 4616 3153 2126 1566
07-24 76° 91° 6197 4668 3194 2160 1594
07-25 77° 90° 6259 4720 3236 2194 1623
07-26 76° 88° 6320 4770 3276 2226 1650
07-27 75° 88° 6379 4820 3316 2258 1677
07-28 77° 92° 6442 4872 3358 2292 1706
07-29 74° 92° 6502 4923 3399 2325 1734
07-30 72° 87° 6560 4970 3437 2354 1759
07-31 70° 78° 6612 5012 3469 2379 1778
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 61° 77° 6659 5049 3496 2398 1792
08-02 59° 77° 6705 5085 3522 2416 1805
08-03 56° 79° 6751 5121 3547 2433 1817
08-04 63° 74° 6797 5158 3574 2452 1831
08-05 62° 82° 6848 5198 3604 2474 1849
08-06 64° 86° 6900 5241 3637 2499 1868
08-07 70° 87° 6957 5287 3673 2527 1892
08-08 71° 88° 7014 5334 3711 2557 1916
08-09 71° 88° 7071 5382 3748 2586 1940
08-10 72° 88° 7129 5430 3786 2616 1965
08-11 71° 89° 7187 5477 3824 2646 1990
08-12 71° 88° 7244 5525 3861 2675 2014
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 69° 87° 7300 5570 3897 2703 2037
08-14 66° 87° 7355 5615 3932 2729 2059
08-15 69° 91° 7413 5663 3970 2759 2084
08-16 75° 92° 7474 5715 4011 2793 2112
08-17 72° 89° 7533 5763 4050 2824 2138
08-18 73° 91° 7593 5813 4090 2855 2165
08-19 75° 90° 7653 5864 4130 2888 2192
08-20 69° 82° 7707 5907 4164 2913 2213
08-21 61° 79° 7755 5945 4192 2934 2228
08-22 59° 81° 7803 5983 4220 2954 2243
08-23 60° 81° 7852 6022 4249 2974 2259
08-24 56° 74° 7895 6055 4271 2989 2268
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 52° 72° 7935 6085 4291 3001 2275
08-26 49° 74° 7974 6115 4311 3013 2282
08-27 49° 76° 8015 6145 4332 3025 2290
08-28 56° 83° 8062 6182 4359 3045 2304
08-29 58° 80° 8109 6219 4386 3064 2318
08-30 56° 79° 8154 6255 4411 3081 2330
08-31 54° 77° 8198 6288 4435 3097 2341
09-01 52° 81° 8242 6323 4459 3113 2352
09-02 51° 83° 8288 6358 4484 3130 2364
09-03 53° 82° 8333 6394 4510 3148 2377
09-04 52° 71° 8373 6423 4530 3159 2384
09-05 53° 72° 8414 6454 4550 3172 2391
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 49° 72° 8452 6482 4569 3183 2397
09-07 45° 72° 8488 6509 4585 3191 2400
09-08 43° 75° 8525 6536 4602 3200 2404
09-09 45° 80° 8566 6566 4623 3212 2412
09-10 58° 86° 8615 6606 4652 3234 2428
09-11 60° 86° 8667 6647 4683 3257 2446
09-12 59° 88° 8718 6688 4715 3280 2465
09-13 65° 94° 8775 6736 4752 3310 2489
09-14 68° 96° 8835 6785 4792 3342 2516
09-15 64° 91° 8891 6831 4827 3369 2538
09-16 61° 91° 8944 6874 4861 3395 2559
09-17 53° 89° 8993 6913 4890 3416 2575
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 55° 92° 9045 6955 4921 3439 2593
09-19 62° 87° 9097 6997 4954 3464 2613
09-20 63° 86° 9149 7040 4986 3488 2632
09-21 61° 84° 9199 7080 5016 3510 2649
09-22 66° 77° 9249 7119 5045 3531 2665
09-23 61° 80° 9297 7157 5074 3552 2681
09-24 64° 76° 9345 7195 5102 3572 2696
09-25 57° 77° 9390 7230 5127 3589 2708
09-26 51° 84° 9435 7266 5152 3606 2720
09-27 53° 87° 9483 7303 5180 3626 2735
09-28 57° 90° 9534 7345 5211 3649 2753
09-29 58° 91° 9587 7387 5244 3674 2773
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 60° 88° 9639 7429 5275 3697 2791
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 34° 48° 19 9 0 0 0
02-16 19° 33° 23 9 0 0 0
02-17 9° 23° 23 9 0 0 0
02-18 15° 41° 29 9 0 0 0
02-19 19° 49° 41 11 0 0 0
02-20 30° 58° 63 23 2 0 0
02-21 39° 67° 94 44 13 3 0
02-22 45° 59° 124 64 23 5 0
02-23 35° 56° 148 78 26 5 0
02-24 28° 45° 162 82 26 5 0
02-25 31° 63° 187 97 31 5 0
02-26 37° 75° 221 121 46 11 1
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 58° 74° 265 155 70 27 12
02-28 23° 66° 288 168 72 27 12
02-29 20° 46° 299 169 72 27 12
03-01 30° 45° 314 174 72 27 12
03-02 34° 57° 338 188 76 27 12
03-03 43° 72° 373 213 91 34 15
03-04 55° 74° 416 246 114 49 24
03-05 46° 63° 449 269 126 54 24
03-06 42° 51° 473 283 131 54 24
03-07 47° 56° 502 302 140 55 24
03-08 51° 59° 535 325 153 60 24
03-09 38° 48° 556 336 154 60 24
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 31° 47° 573 343 154 60 24
03-11 32° 64° 599 359 160 60 24
03-12 44° 70° 634 384 174 67 26
03-13 48° 74° 672 412 193 78 32
03-14 56° 75° 716 446 217 93 43
03-15 44° 58° 745 465 226 94 43
03-16 38° 65° 775 484 235 96 43
03-17 32° 46° 791 491 235 96 43
03-18 26° 35° 800 491 235 96 43
03-19 25° 62° 821 503 237 96 43
03-20 35° 51° 842 514 237 96 43
03-21 29° 49° 859 520 237 96 43
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 33° 60° 883 535 242 96 43
03-23 34° 48° 902 543 242 96 43
03-24 35° 58° 927 558 247 96 43
03-25 50° 64° 961 583 262 103 44
03-26 38° 54° 985 597 266 103 44
03-27 34° 46° 1003 605 266 103 44
03-28 31° 59° 1026 618 269 103 44
03-29 42° 70° 1060 642 283 109 45
03-30 56° 74° 1103 675 306 124 56
03-31 46° 72° 1141 702 323 133 60
04-01 52° 72° 1181 733 343 145 67
04-02 41° 65° 1212 754 354 148 67
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 36° 41° 1228 760 354 148 67
04-04 35° 41° 1244 766 354 148 67
04-05 38° 45° 1264 776 354 148 67
04-06 30° 54° 1284 786 354 148 67
04-07 42° 61° 1313 805 364 149 67
04-08 47° 73° 1352 833 382 160 72
04-09 55° 70° 1392 864 402 172 80
04-10 50° 59° 1425 886 415 177 80
04-11 51° 61° 1459 911 430 183 81
04-12 45° 61° 1490 932 441 186 81
04-13 41° 72° 1525 957 456 193 83
04-14 59° 80° 1573 994 483 213 98
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 58° 74° 1617 1029 507 229 109
04-16 62° 80° 1666 1067 536 250 125
04-17 65° 72° 1713 1104 563 269 138
04-18 51° 74° 1753 1135 583 281 146
04-19 44° 56° 1781 1153 591 281 146
04-20 39° 52° 1805 1166 595 281 146
04-21 34° 47° 1823 1175 595 281 146
04-22 37° 65° 1852 1194 604 282 146
04-23 50° 59° 1885 1217 617 287 146
04-24 42° 52° 1910 1232 622 287 146
04-25 33° 61° 1935 1247 627 287 146
04-26 48° 68° 1971 1273 643 295 149
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 60° 74° 2016 1308 668 312 161
04-28 65° 78° 2066 1347 698 333 177
04-29 57° 69° 2107 1378 719 346 185
04-30 53° 76° 2149 1411 741 361 195
05-01 62° 78° 2197 1449 769 381 210
05-02 60° 83° 2247 1489 799 403 227
05-03 62° 76° 2294 1526 826 422 241
05-04 55° 81° 2341 1562 853 440 254
05-05 56° 69° 2381 1593 873 453 262
05-06 57° 73° 2424 1626 896 468 272
05-07 64° 80° 2474 1666 926 490 289
05-08 55° 76° 2518 1699 950 505 299
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 57° 73° 2561 1733 973 521 310
05-10 51° 67° 2598 1760 990 530 314
05-11 55° 74° 2640 1792 1012 544 323
05-12 50° 81° 2684 1825 1036 559 333
05-13 60° 74° 2729 1860 1061 576 345
05-14 61° 70° 2772 1894 1084 592 356
05-15 57° 71° 2815 1926 1106 606 365
05-16 55° 69° 2855 1956 1127 618 372
05-17 61° 78° 2902 1994 1154 638 387
05-18 60° 83° 2952 2033 1184 660 403
05-19 64° 88° 3006 2077 1218 686 424
05-20 66° 86° 3060 2122 1252 712 446
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 66° 88° 3115 2167 1287 739 468
05-22 62° 77° 3163 2204 1315 758 482
05-23 57° 79° 3209 2240 1341 776 495
05-24 63° 77° 3257 2278 1369 797 510
05-25 61° 79° 3305 2317 1397 817 526
05-26 62° 78° 3353 2355 1425 837 541
05-27 60° 75° 3399 2390 1451 855 553
05-28 58° 77° 3444 2426 1476 872 566
05-29 54° 73° 3486 2457 1498 885 574
05-30 53° 77° 3529 2490 1520 900 584
05-31 55° 77° 3573 2524 1545 916 595
06-01 62° 69° 3616 2558 1568 932 606
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 63° 73° 3662 2594 1594 950 619
06-03 60° 84° 3712 2634 1624 972 636
06-04 66° 81° 3764 2675 1656 995 654
06-05 67° 79° 3815 2716 1686 1018 672
06-06 63° 80° 3865 2756 1716 1040 689
06-07 58° 82° 3912 2794 1744 1060 704
06-08 62° 78° 3960 2832 1772 1080 719
06-09 56° 80° 4007 2868 1798 1098 732
06-10 56° 72° 4048 2900 1820 1112 741
06-11 48° 78° 4089 2931 1841 1125 749
06-12 59° 86° 4140 2971 1872 1147 766
06-13 66° 89° 4195 3016 1907 1174 788
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 70° 87° 4251 3063 1943 1203 812
06-15 61° 87° 4303 3104 1974 1226 830
06-16 67° 92° 4360 3152 2012 1256 855
06-17 75° 92° 4422 3203 2054 1290 883
06-18 73° 85° 4479 3251 2091 1319 908
06-19 73° 91° 4539 3300 2131 1351 934
06-20 71° 90° 4598 3349 2170 1382 960
06-21 69° 90° 4655 3397 2207 1411 985
06-22 72° 90° 4714 3446 2246 1442 1011
06-23 74° 86° 4772 3494 2284 1472 1036
06-24 64° 87° 4826 3537 2318 1497 1056
06-25 71° 89° 4884 3585 2355 1527 1081
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 70° 83° 4938 3630 2390 1554 1103
06-27 64° 83° 4989 3671 2421 1577 1121
06-28 69° 86° 5045 3716 2457 1604 1143
06-29 78° 86° 5105 3766 2497 1636 1170
06-30 63° 78° 5153 3805 2525 1657 1186
07-01 51° 77° 5195 3837 2547 1671 1195
07-02 60° 86° 5246 3877 2578 1694 1212
07-03 73° 84° 5303 3924 2614 1722 1236
07-04 69° 78° 5354 3965 2646 1746 1254
07-05 66° 84° 5407 4008 2679 1770 1274
07-06 63° 82° 5457 4049 2709 1793 1292
07-07 63° 86° 5510 4091 2742 1817 1311
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 70° 85° 5565 4137 2777 1845 1334
07-09 66° 74° 5613 4175 2805 1865 1349
07-10 65° 84° 5666 4217 2837 1889 1368
07-11 66° 83° 5718 4259 2870 1914 1387
07-12 66° 85° 5771 4303 2903 1939 1408
07-13 68° 88° 5827 4349 2939 1967 1431
07-14 75° 89° 5887 4399 2979 1999 1458
07-15 71° 91° 5946 4448 3018 2030 1484
07-16 69° 76° 5997 4488 3049 2053 1501
07-17 68° 83° 6050 4532 3082 2078 1522
07-18 60° 75° 6096 4567 3108 2095 1534
07-19 55° 76° 6139 4601 3131 2111 1545
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 59° 80° 6187 4638 3159 2130 1559
07-21 64° 80° 6237 4678 3188 2152 1576
07-22 63° 82° 6287 4718 3219 2175 1593
07-23 63° 83° 6338 4759 3250 2197 1611
07-24 67° 83° 6390 4802 3282 2222 1631
07-25 66° 81° 6442 4844 3314 2246 1650
07-26 62° 80° 6491 4883 3343 2267 1666
07-27 60° 83° 6541 4922 3373 2288 1682
07-28 71° 82° 6595 4967 3407 2315 1704
07-29 68° 85° 6650 5012 3442 2342 1726
07-30 68° 86° 6705 5057 3477 2369 1748
07-31 69° 83° 6760 5101 3511 2395 1769
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 72° 84° 6816 5147 3548 2424 1792
08-02 71° 81° 6870 5192 3582 2450 1814
08-03 69° 88° 6926 5238 3618 2478 1837
08-04 72° 88° 6984 5286 3656 2508 1862
08-05 72° 90° 7043 5334 3695 2539 1887
08-06 70° 90° 7101 5382 3732 2568 1912
08-07 67° 74° 7149 5421 3761 2589 1928
08-08 63° 80° 7199 5460 3791 2610 1944
08-09 61° 74° 7244 5496 3816 2628 1957
08-10 54° 76° 7287 5529 3839 2643 1967
08-11 57° 77° 7332 5564 3864 2660 1979
08-12 58° 77° 7378 5599 3890 2677 1991
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 61° 79° 7425 5637 3917 2697 2006
08-14 60° 81° 7474 5675 3946 2718 2021
08-15 67° 82° 7526 5718 3978 2742 2041
08-16 68° 86° 7581 5763 4013 2769 2063
08-17 69° 81° 7634 5806 4046 2794 2083
08-18 67° 80° 7686 5847 4078 2818 2101
08-19 61° 77° 7733 5885 4105 2837 2116
08-20 55° 73° 7775 5916 4127 2850 2124
08-21 51° 72° 7814 5946 4146 2862 2131
08-22 51° 76° 7856 5977 4168 2876 2139
08-23 52° 83° 7901 6013 4193 2893 2152
08-24 66° 88° 7956 6058 4228 2920 2174
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 67° 89° 8012 6104 4264 2948 2197
08-26 70° 91° 8071 6152 4303 2978 2222
08-27 73° 94° 8132 6204 4344 3012 2251
08-28 70° 83° 8186 6248 4378 3038 2272
08-29 68° 90° 8244 6295 4415 3067 2296
08-30 72° 92° 8304 6345 4456 3099 2323
08-31 67° 82° 8356 6388 4488 3124 2343
09-01 58° 82° 8404 6426 4516 3144 2358
09-02 54° 75° 8447 6458 4538 3158 2367
09-03 51° 73° 8487 6488 4559 3170 2374
09-04 51° 84° 8532 6524 4584 3188 2387
09-05 66° 86° 8586 6568 4618 3214 2408
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 59° 78° 8633 6604 4645 3232 2421
09-07 50° 67° 8669 6631 4661 3241 2425
09-08 42° 68° 8702 6654 4674 3246 2425
09-09 45° 76° 8741 6683 4693 3257 2431
09-10 49° 83° 8785 6716 4717 3272 2441
09-11 53° 85° 8832 6753 4744 3291 2455
09-12 55° 84° 8879 6791 4771 3311 2470
09-13 64° 74° 8926 6828 4798 3330 2484
09-14 64° 88° 8980 6872 4832 3356 2505
09-15 64° 86° 9033 6915 4865 3381 2525
09-16 60° 87° 9085 6956 4897 3404 2543
09-17 56° 87° 9134 6996 4926 3426 2560
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 54° 87° 9183 7034 4955 3446 2575
09-19 57° 89° 9234 7075 4986 3469 2593
09-20 66° 91° 9290 7122 5022 3498 2617
09-21 60° 89° 9343 7164 5055 3523 2636
09-22 67° 75° 9392 7203 5084 3543 2652
09-23 64° 68° 9436 7237 5108 3559 2663
09-24 62° 70° 9480 7271 5132 3575 2674
09-25 56° 76° 9523 7305 5155 3591 2685
09-26 55° 78° 9568 7340 5180 3608 2697
09-27 62° 70° 9612 7374 5204 3624 2708
09-28 63° 74° 9659 7410 5231 3642 2721
09-29 66° 75° 9707 7449 5259 3663 2737
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 64° 74° 9754 7485 5286 3682 2750

 

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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