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Ester/Amine Spring Broadleaf Herbicide Timer - Purdue (GDD 50)
through Sun, May. 17. 2026

 

GDD Total: 341 (Base 50) through Sun, May. 17, 2026

  

Detroit, MI

        

Forecast »

“Flashback” to 2025

5/16

5/17

5/18

5/19

5/20

5/21

5/22

5/23

5/24

5/25

5/26

5/27

5/28

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 23° 47° 13 3 0 0 0
02-16 23° 53° 29 9 0 0 0
02-17 34° 46° 47 17 0 0 0
02-18 35° 47° 66 26 0 0 0
02-19 33° 38° 80 30 0 0 0
02-20 34° 45° 98 38 0 0 0
02-21 31° 36° 109 39 0 0 0
02-22 27° 32° 117 39 0 0 0
02-23 21° 28° 120 39 0 0 0
02-24 16° 34° 123 39 0 0 0
02-25 20° 38° 130 39 0 0 0
02-26 11° 35° 131 39 0 0 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 23° 57° 149 48 0 0 0
02-28 24° 51° 165 53 0 0 0
03-01 15° 27° 165 53 0 0 0
03-02 12° 33° 165 53 0 0 0
03-03 19° 36° 171 53 0 0 0
03-04 31° 41° 185 57 0 0 0
03-05 33° 42° 200 63 0 0 0
03-06 35° 56° 224 76 3 0 0
03-07 51° 68° 261 103 21 9 4
03-08 42° 61° 291 123 30 11 4
03-09 46° 73° 328 150 47 20 9
03-10 39° 74° 363 175 62 27 10
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 35° 63° 390 192 69 27 10
03-12 29° 43° 403 196 69 27 10
03-13 29° 51° 421 203 69 27 10
03-14 25° 41° 432 204 69 27 10
03-15 33° 70° 462 224 79 29 10
03-16 22° 66° 484 236 81 29 10
03-17 18° 26° 484 236 81 29 10
03-18 17° 34° 487 236 81 29 10
03-19 33° 53° 508 247 82 29 10
03-20 35° 71° 539 268 93 32 10
03-21 34° 43° 555 274 93 32 10
03-22 34° 52° 576 285 94 32 10
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 27° 37° 586 285 94 32 10
03-24 20° 44° 596 285 94 32 10
03-25 29° 58° 618 297 95 32 10
03-26 39° 67° 649 318 106 35 10
03-27 27° 38° 659 318 106 35 10
03-28 26° 44° 672 321 106 35 10
03-29 37° 55° 696 335 110 35 10
03-30 42° 73° 732 361 126 42 13
03-31 61° 76° 779 398 153 61 27
04-01 33° 53° 800 409 154 61 27
04-02 34° 53° 822 421 156 61 27
04-03 50° 76° 862 451 176 74 35
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 41° 64° 893 472 187 77 35
04-05 38° 49° 915 484 189 77 35
04-06 34° 50° 935 494 189 77 35
04-07 23° 36° 942 494 189 77 35
04-08 24° 54° 959 501 189 77 35
04-09 46° 68° 994 526 204 84 37
04-10 41° 56° 1021 542 210 84 37
04-11 38° 51° 1043 555 213 84 37
04-12 39° 82° 1082 583 231 94 42
04-13 65° 82° 1133 625 263 118 61
04-14 64° 82° 1184 666 294 141 79
04-15 61° 72° 1229 700 318 157 90
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 58° 69° 1270 732 340 171 99
04-17 53° 71° 1310 762 360 183 106
04-18 46° 67° 1345 786 374 189 107
04-19 37° 50° 1366 798 376 189 107
04-20 29° 46° 1382 803 376 189 107
04-21 38° 73° 1415 827 389 195 107
04-22 48° 72° 1453 855 407 205 113
04-23 47° 76° 1493 885 427 217 119
04-24 51° 74° 1534 915 448 229 127
04-25 47° 53° 1562 933 456 229 127
04-26 42° 61° 1591 953 465 231 127
04-27 46° 69° 1626 978 480 238 129
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 56° 68° 1666 1008 500 250 136
04-29 46° 55° 1695 1026 509 250 136
04-30 41° 55° 1721 1042 515 250 136
05-01 41° 48° 1744 1055 518 250 136
05-02 37° 48° 1764 1065 518 250 136
05-03 35° 64° 1791 1083 525 250 136
05-04 48° 76° 1832 1113 546 263 143
05-05 52° 65° 1868 1140 562 271 147
05-06 45° 54° 1896 1157 570 271 147
05-07 41° 56° 1923 1174 577 271 147
05-08 41° 64° 1953 1194 587 273 147
05-09 49° 70° 1990 1222 604 283 151
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 42° 62° 2021 1242 615 285 151
05-11 42° 56° 2048 1259 622 285 151
05-12 36° 60° 2074 1275 628 285 151
05-13 45° 60° 2105 1296 639 288 151
05-14 46° 65° 2138 1320 652 294 152
05-15 40° 70° 2171 1343 665 299 152
05-16 53° 81° 2216 1378 690 316 164
05-17 64° 86° 2269 1421 723 341 184
05-18 69° 90° 2327 1468 761 370 209
05-19 66° 88° 2382 1513 796 397 231
05-20 48° 72° 2420 1541 814 407 236
05-21 42° 62° 2450 1561 824 409 236
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 48° 64° 2484 1585 838 415 236
05-23 52° 66° 2521 1612 855 424 240
05-24 54° 77° 2564 1646 878 440 251
05-25 57° 82° 2611 1683 905 459 265
05-26 61° 86° 2663 1724 937 482 283
05-27 63° 85° 2715 1766 969 506 303
05-28 60° 80° 2763 1804 997 526 318
05-29 55° 75° 2806 1837 1020 541 328
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 21° 33° 5 0 0 0 0
02-16 22° 30° 9 0 0 0 0
02-17 10° 22° 9 0 0 0 0
02-18 4° 17° 9 0 0 0 0
02-19 3° 18° 9 0 0 0 0
02-20 12° 22° 9 0 0 0 0
02-21 19° 31° 12 0 0 0 0
02-22 20° 31° 15 0 0 0 0
02-23 23° 35° 22 0 0 0 0
02-24 32° 52° 42 10 0 0 0
02-25 40° 56° 68 26 6 0 0
02-26 30° 40° 81 29 6 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 35° 45° 99 37 6 0 0
02-28 31° 56° 120 48 7 0 0
03-01 22° 42° 130 48 7 0 0
03-02 18° 29° 132 48 7 0 0
03-03 23° 40° 141 48 7 0 0
03-04 35° 51° 162 59 8 0 0
03-05 38° 57° 187 74 13 0 0
03-06 28° 37° 197 74 13 0 0
03-07 27° 41° 209 76 13 0 0
03-08 22° 38° 218 76 13 0 0
03-09 32° 56° 239 88 15 0 0
03-10 35° 64° 267 106 23 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 31° 60° 290 119 26 0 0
03-12 27° 46° 305 124 26 0 0
03-13 27° 55° 324 133 26 0 0
03-14 33° 70° 353 152 36 1 0
03-15 57° 72° 396 185 58 16 10
03-16 34° 60° 421 200 63 16 10
03-17 28° 45° 436 204 63 16 10
03-18 35° 67° 465 223 73 17 10
03-19 59° 72° 508 257 96 33 20
03-20 34° 64° 535 274 103 33 20
03-21 27° 53° 553 282 103 33 20
03-22 30° 49° 571 289 103 33 20
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 22° 38° 579 289 103 33 20
03-24 34° 44° 596 297 103 33 20
03-25 28° 45° 611 301 103 33 20
03-26 26° 43° 624 304 103 33 20
03-27 24° 57° 642 312 103 33 20
03-28 41° 64° 673 333 113 35 20
03-29 60° 68° 715 365 135 49 29
03-30 48° 66° 750 390 150 56 31
03-31 39° 58° 776 407 157 56 31
04-01 27° 41° 788 408 157 56 31
04-02 35° 50° 809 419 158 56 31
04-03 47° 65° 843 443 172 62 32
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 38° 48° 865 455 173 62 32
04-05 43° 49° 889 469 178 62 32
04-06 35° 46° 907 478 178 62 32
04-07 29° 48° 924 484 178 62 32
04-08 23° 39° 933 484 178 62 32
04-09 22° 46° 945 486 178 62 32
04-10 33° 37° 958 490 178 62 32
04-11 33° 50° 978 500 178 62 32
04-12 29° 55° 999 510 178 62 32
04-13 37° 58° 1024 525 183 62 32
04-14 48° 74° 1063 554 202 73 38
04-15 42° 54° 1089 571 209 73 38
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 36° 54° 1112 583 211 73 38
04-17 30° 61° 1136 597 215 73 38
04-18 49° 82° 1179 630 238 89 49
04-19 52° 71° 1218 660 258 100 55
04-20 41° 55° 1244 676 264 100 55
04-21 48° 75° 1284 705 283 112 62
04-22 45° 65° 1317 729 297 117 62
04-23 48° 77° 1358 759 317 130 70
04-24 47° 83° 1401 792 340 145 80
04-25 53° 75° 1443 824 362 159 89
04-26 43° 62° 1474 845 373 161 89
04-27 38° 65° 1503 864 382 163 89
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 42° 73° 1539 890 398 170 91
04-29 55° 84° 1586 927 425 190 106
04-30 41° 59° 1614 945 433 190 106
05-01 48° 68° 1650 971 449 198 109
05-02 52° 71° 1690 1001 469 210 116
05-03 45° 51° 1716 1017 475 210 116
05-04 43° 51° 1741 1032 480 210 116
05-05 49° 68° 1778 1059 497 218 119
05-06 53° 60° 1812 1083 511 225 120
05-07 50° 76° 1853 1114 532 238 128
05-08 43° 54° 1879 1130 538 238 128
05-09 37° 64° 1908 1149 547 238 128
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 46° 79° 1948 1179 567 250 136
05-11 47° 66° 1982 1203 581 257 137
05-12 45° 79° 2023 1234 602 269 144
05-13 63° 70° 2067 1268 626 286 156
05-14 59° 76° 2113 1304 652 303 168
05-15 60° 82° 2162 1343 681 324 184
05-16 62° 84° 2213 1384 712 347 202
05-17 59° 74° 2257 1418 736 364 214
05-18 53° 63° 2294 1445 753 372 217
05-19 46° 59° 2324 1465 763 374 217
05-20 42° 57° 2351 1482 770 374 217
05-21 50° 52° 2380 1501 779 375 217
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 49° 54° 2410 1521 789 377 217
05-23 41° 55° 2436 1538 796 377 217
05-24 43° 62° 2467 1558 806 379 217
05-25 41° 66° 2498 1579 817 383 217
05-26 45° 70° 2534 1605 833 390 220
05-27 52° 72° 2574 1635 853 402 227
05-28 55° 58° 2608 1659 867 409 228
05-29 53° 67° 2647 1688 886 419 234
05-30 52° 77° 2689 1720 908 434 243
05-31 49° 65° 2724 1745 923 441 245
06-01 43° 68° 2758 1769 937 446 246
06-02 45° 80° 2798 1799 957 459 253
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 55° 88° 2848 1839 987 480 270
06-04 63° 87° 2901 1882 1020 505 290
06-05 57° 66° 2940 1911 1039 517 296
06-06 58° 75° 2985 1946 1064 533 308
06-07 56° 78° 3030 1981 1089 550 320
06-08 59° 77° 3076 2017 1115 568 333
06-09 62° 78° 3123 2055 1143 588 348
06-10 54° 75° 3166 2087 1165 603 357
06-11 56° 87° 3216 2127 1195 624 374
06-12 62° 74° 3262 2163 1221 642 387
06-13 60° 72° 3305 2196 1244 658 398
06-14 57° 76° 3350 2231 1269 674 409
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 57° 80° 3396 2267 1295 693 423
06-16 59° 81° 3445 2306 1324 713 438
06-17 64° 86° 3498 2349 1357 739 458
06-18 68° 80° 3550 2391 1389 763 477
06-19 63° 73° 3596 2427 1415 781 490
06-20 60° 79° 3644 2465 1443 800 505
06-21 67° 91° 3701 2512 1480 829 529
06-22 79° 97° 3767 2568 1526 868 562
06-23 77° 98° 3832 2623 1571 905 595
06-24 78° 95° 3897 2678 1616 942 626
06-25 70° 80° 3951 2722 1650 967 647
06-26 66° 88° 4006 2767 1685 994 669
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 71° 92° 4065 2816 1724 1026 695
06-28 71° 84° 4121 2862 1760 1053 718
06-29 63° 87° 4174 2905 1793 1078 738
06-30 70° 83° 4228 2949 1827 1105 759
07-01 72° 87° 4286 2997 1865 1134 784
07-02 64° 88° 4340 3041 1899 1160 805
07-03 69° 86° 4395 3086 1934 1187 827
07-04 64° 87° 4448 3129 1967 1213 847
07-05 69° 93° 4507 3178 2006 1244 873
07-06 74° 94° 4569 3230 2048 1277 902
07-07 67° 78° 4619 3270 2078 1300 919
07-08 59° 83° 4668 3309 2107 1321 935
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 70° 80° 4721 3352 2140 1346 955
07-10 65° 89° 4776 3397 2175 1373 978
07-11 67° 86° 4831 3442 2210 1400 999
07-12 73° 90° 4891 3492 2250 1431 1026
07-13 71° 87° 4948 3539 2287 1460 1050
07-14 67° 87° 5003 3584 2322 1488 1072
07-15 64° 89° 5058 3629 2357 1514 1094
07-16 71° 84° 5113 3674 2392 1542 1116
07-17 67° 79° 5164 3715 2423 1564 1134
07-18 59° 76° 5209 3751 2449 1582 1147
07-19 57° 83° 5258 3789 2477 1602 1162
07-20 67° 79° 5309 3830 2508 1625 1180
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 60° 77° 5355 3867 2535 1644 1194
07-22 56° 79° 5401 3902 2560 1662 1207
07-23 59° 87° 5452 3944 2592 1685 1225
07-24 73° 96° 5515 3996 2634 1719 1254
07-25 73° 85° 5572 4043 2671 1749 1278
07-26 71° 82° 5627 4088 2706 1775 1300
07-27 74° 91° 5687 4138 2746 1808 1327
07-28 70° 90° 5745 4187 2785 1838 1353
07-29 70° 89° 5803 4234 2822 1867 1377
07-30 65° 86° 5856 4277 2855 1893 1397
07-31 60° 74° 5901 4312 2880 1910 1410
08-01 58° 77° 5947 4348 2906 1927 1422
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 56° 77° 5992 4383 2931 1944 1434
08-03 57° 80° 6038 4419 2957 1962 1447
08-04 60° 82° 6087 4458 2986 1984 1463
08-05 66° 84° 6140 4501 3019 2008 1483
08-06 69° 85° 6195 4546 3054 2035 1505
08-07 67° 85° 6249 4590 3088 2062 1526
08-08 67° 88° 6304 4636 3124 2089 1549
08-09 70° 89° 6362 4683 3161 2119 1573
08-10 70° 92° 6421 4732 3200 2150 1599
08-11 71° 91° 6480 4781 3239 2181 1625
08-12 72° 91° 6540 4831 3279 2212 1652
08-13 69° 83° 6594 4875 3313 2239 1673
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 66° 84° 6647 4918 3346 2264 1693
08-15 66° 86° 6701 4962 3380 2289 1714
08-16 66° 90° 6757 5008 3416 2318 1737
08-17 65° 83° 6809 5050 3448 2342 1756
08-18 59° 78° 6856 5087 3475 2360 1770
08-19 64° 76° 6903 5125 3503 2380 1785
08-20 65° 71° 6950 5161 3529 2398 1798
08-21 65° 75° 6997 5198 3556 2418 1813
08-22 60° 80° 7045 5236 3584 2438 1828
08-23 64° 79° 7095 5276 3614 2459 1844
08-24 57° 77° 7140 5311 3639 2476 1856
08-25 55° 68° 7179 5340 3658 2488 1862
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 50° 71° 7218 5369 3677 2498 1868
08-27 50° 75° 7258 5399 3697 2511 1875
08-28 53° 71° 7298 5429 3717 2523 1882
08-29 49° 68° 7335 5456 3734 2531 1886
08-30 45° 71° 7371 5482 3750 2539 1889
08-31 48° 74° 7410 5511 3769 2550 1895
09-01 52° 77° 7452 5543 3791 2565 1904
09-02 54° 78° 7496 5577 3815 2581 1915
09-03 54° 83° 7543 5614 3842 2599 1929
09-04 54° 67° 7581 5642 3860 2610 1934
09-05 47° 74° 7620 5671 3879 2620 1940
09-06 53° 66° 7657 5699 3897 2630 1945
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 46° 68° 7692 5723 3911 2637 1946
09-08 46° 68° 7727 5748 3926 2644 1948
09-09 47° 76° 7767 5778 3946 2655 1955
09-10 52° 77° 7810 5811 3969 2670 1965
09-11 51° 78° 7852 5843 3991 2685 1974
09-12 54° 78° 7896 5877 4015 2701 1985
09-13 53° 77° 7939 5910 4038 2716 1995
09-14 52° 80° 7983 5945 4063 2732 2007
09-15 59° 80° 8031 5982 4090 2752 2021
09-16 57° 82° 8078 6020 4118 2771 2036
09-17 56° 82° 8125 6056 4144 2790 2049
09-18 56° 87° 8174 6095 4173 2811 2065
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 63° 76° 8222 6133 4201 2830 2080
09-20 59° 77° 8268 6169 4227 2849 2093
09-21 60° 77° 8314 6206 4254 2867 2107
09-22 63° 75° 8362 6243 4281 2886 2121
09-23 60° 76° 8408 6279 4307 2905 2134
09-24 64° 72° 8454 6315 4333 2923 2147
09-25 63° 74° 8500 6352 4360 2941 2161
09-26 56° 81° 8547 6388 4386 2960 2174
09-27 56° 85° 8596 6427 4415 2980 2190
09-28 59° 77° 8642 6463 4441 2998 2203
09-29 53° 80° 8686 6497 4465 3015 2215
09-30 54° 79° 8731 6532 4490 3031 2226
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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