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Ester/Amine Spring Broadleaf Herbicide Timer - Purdue (GDD 50)
through Thu, May. 7. 2026

 

GDD Total: 227 (Base 50) through Thu, May. 7, 2026

  

East Lansing, MI

        

Forecast »

“Flashback” to 2025

5/3

5/4

5/5

5/6

5/7

5/8

5/9

5/10

5/11

5/12

5/13

5/14

5/15

Over

601

Amine

201

Ester or Amine

151

Ester

110

Early

71

Under

0

 

Generously Supported By:



Tabular Data

Daily GDD accumulation for various base temperature models in 2025 & 2026

2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 22° 52° 15 5 0 0 0
02-16 25° 57° 34 14 0 0 0
02-17 34° 54° 56 26 2 0 0
02-18 37° 62° 84 44 10 0 0
02-19 34° 52° 105 55 11 0 0
02-20 32° 43° 120 60 11 0 0
02-21 29° 32° 129 60 11 0 0
02-22 24° 30° 134 60 11 0 0
02-23 16° 28° 134 60 11 0 0
02-24 12° 33° 134 60 11 0 0
02-25 15° 32° 136 60 11 0 0
02-26 10° 34° 136 60 11 0 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 28° 55° 156 70 11 0 0
02-28 23° 48° 169 74 11 0 0
03-01 13° 25° 169 74 11 0 0
03-02 14° 35° 172 74 11 0 0
03-03 23° 40° 181 74 11 0 0
03-04 23° 55° 198 81 11 0 0
03-05 39° 43° 217 90 11 0 0
03-06 40° 59° 245 108 19 0 0
03-07 42° 64° 276 129 30 3 0
03-08 36° 59° 302 145 36 3 0
03-09 46° 72° 339 171 52 12 4
03-10 41° 59° 367 189 60 12 4
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 32° 41° 381 194 60 12 4
03-12 25° 41° 393 195 60 12 4
03-13 32° 42° 407 200 60 12 4
03-14 25° 37° 416 200 60 12 4
03-15 32° 63° 442 215 66 12 4
03-16 19° 50° 454 218 66 12 4
03-17 16° 24° 454 218 66 12 4
03-18 17° 33° 457 218 66 12 4
03-19 31° 51° 476 227 66 12 4
03-20 37° 68° 506 247 76 14 4
03-21 29° 51° 524 255 76 14 4
03-22 34° 56° 547 268 79 14 4
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 27° 35° 556 268 79 14 4
03-24 20° 45° 567 269 79 14 4
03-25 32° 62° 592 283 84 14 4
03-26 38° 66° 622 304 94 16 4
03-27 26° 37° 631 304 94 16 4
03-28 25° 42° 642 305 94 16 4
03-29 33° 57° 666 318 97 16 4
03-30 46° 73° 703 346 115 26 8
03-31 50° 74° 743 376 135 38 15
04-01 32° 47° 760 383 135 38 15
04-02 31° 60° 784 397 138 38 15
04-03 45° 63° 816 419 150 42 15
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 38° 58° 842 435 156 42 15
04-05 33° 41° 857 440 156 42 15
04-06 30° 47° 874 447 156 42 15
04-07 21° 37° 881 447 156 42 15
04-08 28° 58° 903 458 158 42 15
04-09 52° 70° 942 487 177 53 21
04-10 39° 55° 967 502 182 53 21
04-11 31° 56° 988 513 183 53 21
04-12 42° 79° 1026 542 201 63 27
04-13 59° 78° 1073 579 228 82 40
04-14 63° 78° 1122 617 257 103 56
04-15 59° 70° 1164 650 279 117 66
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 54° 65° 1202 678 297 127 70
04-17 52° 74° 1243 709 318 140 79
04-18 43° 63° 1274 730 329 143 79
04-19 33° 49° 1293 739 329 143 79
04-20 26° 48° 1308 743 329 143 79
04-21 39° 69° 1340 766 342 148 79
04-22 43° 77° 1379 794 360 158 84
04-23 50° 81° 1422 828 383 173 94
04-24 59° 79° 1469 865 411 193 108
04-25 44° 60° 1499 885 421 195 108
04-26 42° 67° 1532 907 433 199 108
04-27 47° 69° 1567 933 449 207 111
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 49° 61° 1601 956 462 212 111
04-29 43° 53° 1627 972 468 212 111
04-30 38° 52° 1650 985 471 212 111
05-01 39° 47° 1671 996 472 212 111
05-02 31° 49° 1689 1005 472 212 111
05-03 36° 62° 1716 1022 479 212 111
05-04 47° 75° 1755 1051 498 223 117
05-05 46° 62° 1787 1073 510 227 117
05-06 39° 53° 1811 1087 514 227 117
05-07 36° 54° 1834 1100 517 227 117
05-08 35° 64° 1862 1118 525 227 117
05-09 45° 68° 1897 1142 540 233 119
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 38° 59° 1923 1159 546 233 119
05-11 36° 55° 1947 1172 550 233 119
05-12 36° 61° 1973 1189 556 233 119
05-13 48° 58° 2004 1210 567 236 119
05-14 43° 65° 2036 1232 579 241 119
05-15 46° 70° 2072 1258 595 249 122
05-16 53° 78° 2116 1291 619 264 132
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 19° 29° 2 0 0 0 0
02-16 19° 26° 3 0 0 0 0
02-17 6° 22° 3 0 0 0 0
02-18 -1° 15° 3 0 0 0 0
02-19 8° 17° 3 0 0 0 0
02-20 14° 24° 3 0 0 0 0
02-21 20° 32° 7 0 0 0 0
02-22 17° 29° 8 0 0 0 0
02-23 19° 37° 14 0 0 0 0
02-24 32° 48° 32 8 0 0 0
02-25 33° 52° 52 19 1 0 0
02-26 27° 38° 63 19 1 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 32° 40° 77 24 1 0 0
02-28 29° 53° 96 32 1 0 0
03-01 18° 34° 100 32 1 0 0
03-02 15° 31° 101 32 1 0 0
03-03 18° 39° 108 32 1 0 0
03-04 35° 47° 126 41 1 0 0
03-05 30° 54° 147 51 1 0 0
03-06 25° 34° 154 51 1 0 0
03-07 28° 37° 164 51 1 0 0
03-08 19° 37° 170 51 1 0 0
03-09 31° 54° 191 62 2 0 0
03-10 35° 64° 219 80 9 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 36° 53° 241 92 12 0 0
03-12 27° 50° 258 99 12 0 0
03-13 26° 60° 279 111 13 0 0
03-14 39° 75° 314 135 28 7 2
03-15 57° 73° 357 168 51 22 12
03-16 30° 56° 378 179 52 22 12
03-17 23° 48° 392 183 52 22 12
03-18 41° 68° 424 205 64 26 12
03-19 53° 70° 464 235 84 38 18
03-20 30° 51° 482 243 84 38 18
03-21 25° 55° 500 252 84 38 18
03-22 27° 49° 516 257 84 38 18
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 22° 43° 527 258 84 38 18
03-24 32° 40° 541 262 84 38 18
03-25 25° 43° 553 264 84 38 18
03-26 25° 46° 566 267 84 38 18
03-27 25° 53° 583 274 84 38 18
03-28 41° 69° 616 297 97 43 18
03-29 53° 69° 655 326 116 54 24
03-30 49° 70° 693 354 133 63 29
03-31 32° 56° 714 366 135 63 29
04-01 26° 43° 727 368 135 63 29
04-02 34° 55° 750 381 138 63 29
04-03 41° 63° 780 401 148 65 29
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 33° 51° 799 410 148 65 29
04-05 39° 52° 823 424 152 65 29
04-06 31° 45° 839 430 152 65 29
04-07 26° 42° 851 432 152 65 29
04-08 25° 35° 860 432 152 65 29
04-09 25° 46° 873 436 152 65 29
04-10 33° 40° 887 440 152 65 29
04-11 28° 51° 905 448 152 65 29
04-12 28° 56° 925 458 152 65 29
04-13 42° 58° 953 476 160 65 29
04-14 46° 69° 988 501 175 73 31
04-15 37° 48° 1009 512 176 73 31
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 34° 51° 1029 522 176 73 31
04-17 30° 63° 1054 537 181 73 31
04-18 55° 77° 1098 571 205 89 42
04-19 45° 70° 1134 596 220 97 45
04-20 36° 59° 1159 612 226 97 45
04-21 47° 65° 1193 636 240 103 46
04-22 39° 64° 1222 655 249 104 46
04-23 50° 69° 1260 683 266 113 51
04-24 48° 81° 1302 715 289 127 60
04-25 52° 77° 1344 747 311 142 69
04-26 44° 57° 1373 766 320 142 69
04-27 35° 67° 1402 785 329 144 69
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 45° 75° 1440 813 347 153 74
04-29 50° 81° 1483 846 370 169 84
04-30 36° 61° 1510 863 376 169 84
05-01 46° 72° 1547 890 393 178 88
05-02 50° 63° 1581 914 408 184 90
05-03 44° 55° 1609 932 416 184 90
05-04 39° 56° 1635 948 421 184 90
05-05 47° 67° 1670 972 436 191 92
05-06 52° 60° 1703 996 450 197 92
05-07 47° 76° 1743 1025 469 208 99
05-08 40° 56° 1769 1042 476 208 99
05-09 33° 64° 1795 1058 482 208 99
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 45° 77° 1834 1087 501 219 104
05-11 42° 71° 1869 1112 515 226 106
05-12 44° 80° 1909 1142 535 238 113
05-13 61° 69° 1952 1175 559 253 123
05-14 61° 76° 1999 1212 586 272 137
05-15 60° 84° 2049 1251 615 293 154
05-16 57° 82° 2096 1289 643 313 168
05-17 53° 73° 2137 1320 664 326 176
05-18 50° 63° 2172 1344 678 332 178
05-19 44° 57° 2200 1363 687 333 178
05-20 40° 52° 2224 1377 691 333 178
05-21 47° 50° 2251 1394 698 333 178
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 47° 55° 2280 1413 707 334 178
05-23 38° 54° 2304 1427 711 334 178
05-24 39° 61° 2332 1445 719 334 178
05-25 38° 65° 2362 1464 728 336 178
05-26 42° 70° 2396 1489 743 342 179
05-27 50° 73° 2436 1519 762 354 186
05-28 54° 63° 2473 1545 779 363 190
05-29 54° 66° 2511 1574 797 373 195
05-30 47° 74° 2549 1602 816 383 201
05-31 46° 63° 2582 1625 829 388 201
06-01 38° 68° 2613 1646 840 391 201
06-02 41° 79° 2651 1674 857 401 205
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 56° 86° 2700 1713 887 422 222
06-04 61° 77° 2747 1750 914 441 236
06-05 55° 72° 2789 1782 936 455 244
06-06 55° 76° 2833 1815 959 471 255
06-07 51° 77° 2875 1848 982 485 265
06-08 58° 78° 2921 1884 1008 503 278
06-09 54° 77° 2964 1917 1031 518 288
06-10 51° 70° 3003 1946 1050 529 294
06-11 51° 85° 3049 1982 1076 547 307
06-12 61° 76° 3096 2018 1102 566 320
06-13 57° 71° 3137 2050 1124 579 329
06-14 56° 78° 3183 2085 1149 597 341
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 54° 79° 3227 2120 1174 613 353
06-16 58° 83° 3276 2159 1202 634 368
06-17 65° 88° 3330 2203 1237 660 390
06-18 66° 80° 3381 2244 1267 683 407
06-19 61° 76° 3427 2280 1294 701 421
06-20 61° 78° 3475 2317 1321 721 435
06-21 71° 91° 3534 2366 1360 752 461
06-22 78° 93° 3597 2420 1404 787 492
06-23 77° 94° 3661 2473 1447 823 522
06-24 75° 89° 3721 2523 1487 855 549
06-25 70° 79° 3773 2566 1520 879 569
06-26 68° 84° 3827 2610 1553 905 589
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 70° 88° 3884 2657 1590 934 613
06-28 67° 78° 3934 2697 1621 956 631
06-29 62° 85° 3985 2738 1652 979 649
06-30 71° 83° 4040 2783 1687 1006 671
07-01 68° 82° 4093 2826 1720 1031 690
07-02 62° 85° 4144 2867 1751 1054 709
07-03 63° 84° 4196 2909 1783 1078 727
07-04 63° 85° 4248 2951 1815 1102 747
07-05 71° 90° 4307 2999 1853 1133 772
07-06 73° 87° 4365 3048 1892 1163 797
07-07 64° 74° 4412 3085 1919 1182 811
07-08 60° 83° 4461 3124 1948 1203 828
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 69° 80° 4514 3167 1980 1228 847
07-10 65° 81° 4564 3207 2011 1250 865
07-11 65° 84° 4617 3249 2043 1275 884
07-12 72° 84° 4673 3296 2080 1303 907
07-13 68° 83° 4726 3339 2113 1328 928
07-14 58° 83° 4775 3378 2141 1349 943
07-15 59° 86° 4825 3418 2172 1371 961
07-16 71° 85° 4881 3464 2207 1399 983
07-17 62° 74° 4927 3500 2233 1417 996
07-18 54° 76° 4970 3533 2256 1432 1006
07-19 63° 80° 5019 3572 2286 1453 1023
07-20 64° 76° 5067 3610 2314 1473 1038
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 57° 78° 5112 3645 2339 1490 1050
07-22 57° 81° 5159 3682 2366 1509 1064
07-23 59° 88° 5211 3724 2397 1533 1082
07-24 72° 93° 5271 3774 2438 1565 1110
07-25 72° 82° 5326 3819 2473 1592 1132
07-26 72° 82° 5381 3864 2508 1619 1154
07-27 71° 89° 5439 3912 2546 1649 1179
07-28 67° 85° 5493 3956 2580 1675 1200
07-29 70° 88° 5551 4003 2617 1705 1224
07-30 62° 83° 5601 4044 2648 1727 1242
07-31 61° 76° 5648 4081 2674 1746 1255
08-01 55° 75° 5691 4114 2697 1761 1265
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 50° 77° 5732 4145 2719 1774 1274
08-03 53° 79° 5776 4179 2743 1790 1285
08-04 55° 80° 5822 4215 2768 1808 1297
08-05 59° 82° 5870 4253 2797 1828 1313
08-06 62° 83° 5921 4294 2828 1851 1331
08-07 65° 86° 5975 4338 2861 1877 1351
08-08 67° 87° 6030 4383 2897 1904 1373
08-09 69° 90° 6087 4430 2934 1933 1398
08-10 70° 90° 6145 4478 2972 1963 1423
08-11 71° 88° 6203 4526 3010 1993 1448
08-12 69° 85° 6258 4571 3044 2020 1469
08-13 67° 82° 6310 4613 3077 2044 1489
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 62° 83° 6361 4654 3108 2067 1506
08-15 62° 85° 6413 4695 3139 2091 1525
08-16 68° 90° 6470 4743 3176 2120 1549
08-17 63° 80° 6519 4782 3206 2141 1566
08-18 54° 82° 6565 4818 3232 2159 1579
08-19 65° 76° 6613 4856 3260 2179 1594
08-20 62° 71° 6658 4891 3285 2196 1606
08-21 59° 75° 6703 4926 3310 2213 1618
08-22 55° 80° 6748 4961 3335 2230 1630
08-23 62° 80° 6798 5001 3364 2252 1646
08-24 55° 73° 6840 5032 3386 2266 1655
08-25 53° 68° 6878 5061 3404 2276 1660
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 46° 69° 6913 5086 3420 2283 1663
08-27 44° 73° 6950 5113 3437 2292 1666
08-28 53° 74° 6991 5144 3458 2305 1675
08-29 45° 66° 7025 5168 3472 2311 1676
08-30 42° 72° 7060 5193 3487 2318 1677
08-31 44° 75° 7097 5220 3504 2327 1682
09-01 45° 76° 7136 5249 3523 2338 1688
09-02 48° 78° 7177 5280 3544 2351 1696
09-03 53° 76° 7220 5313 3567 2366 1705
09-04 47° 64° 7254 5337 3580 2372 1706
09-05 47° 65° 7288 5361 3594 2378 1707
09-06 46° 60° 7319 5382 3606 2381 1707
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 39° 65° 7349 5402 3616 2383 1707
09-08 38° 67° 7380 5423 3627 2386 1707
09-09 45° 74° 7418 5450 3644 2396 1712
09-10 50° 77° 7459 5482 3666 2409 1721
09-11 48° 78° 7500 5513 3687 2422 1729
09-12 50° 80° 7544 5546 3710 2438 1739
09-13 54° 77° 7587 5580 3734 2453 1749
09-14 53° 82° 7632 5615 3759 2470 1762
09-15 52° 81° 7677 5650 3784 2487 1774
09-16 52° 80° 7722 5685 3808 2504 1785
09-17 49° 82° 7765 5718 3832 2519 1795
09-18 54° 85° 7812 5755 3859 2538 1810
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 59° 82° 7861 5794 3888 2559 1825
09-20 55° 81° 7907 5830 3914 2577 1838
09-21 58° 75° 7952 5865 3939 2594 1850
09-22 62° 77° 7999 5902 3966 2613 1865
09-23 61° 71° 8043 5936 3990 2629 1875
09-24 62° 71° 8088 5971 4014 2646 1887
09-25 60° 74° 8132 6005 4039 2662 1899
09-26 53° 78° 8176 6039 4063 2678 1909
09-27 54° 85° 8224 6077 4090 2698 1924
09-28 57° 79° 8270 6113 4116 2716 1937
09-29 50° 82° 8314 6147 4140 2732 1948
09-30 50° 81° 8357 6180 4164 2747 1958
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55

 

Latest Updates

February 16th, 2026Welcome to the 2026 GDD Tracking Season

Although Punxsutawney Phil saw his shadow predicting six more weeks of winter, GDDTracker will start 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. As spring turns to summer, 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 2026!


 

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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