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

 
  

Dorr, MI

        

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 20° 29° 2 0 0 0 0
02-16 20° 28° 4 0 0 0 0
02-17 7° 19° 4 0 0 0 0
02-18 1° 14° 4 0 0 0 0
02-19 7° 19° 4 0 0 0 0
02-20 11° 27° 4 0 0 0 0
02-21 17° 31° 6 0 0 0 0
02-22 17° 29° 7 0 0 0 0
02-23 17° 34° 11 0 0 0 0
02-24 32° 42° 26 5 0 0 0
02-25 30° 46° 42 12 0 0 0
02-26 28° 38° 53 12 0 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 33° 41° 68 17 0 0 0
02-28 27° 49° 83 23 0 0 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 19° 31° 86 23 0 0 0
03-02 18° 29° 88 23 0 0 0
03-03 19° 38° 95 23 0 0 0
03-04 35° 50° 116 34 1 0 0
03-05 28° 52° 134 42 1 0 0
03-06 26° 33° 141 42 1 0 0
03-07 28° 37° 152 43 1 0 0
03-08 21° 38° 160 43 1 0 0
03-09 32° 52° 180 53 1 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 36° 61° 206 69 8 0 0
03-11 37° 52° 228 81 10 0 0
03-12 31° 53° 248 91 10 0 0
03-13 28° 63° 272 105 13 0 0
03-14 42° 76° 309 132 30 9 4
03-15 50° 71° 348 161 49 20 10
03-16 29° 48° 364 167 49 20 10
03-17 20° 49° 376 169 49 20 10
03-18 42° 67° 409 192 61 24 10
03-19 48° 68° 444 217 77 32 13
03-20 29° 45° 460 223 77 32 13
03-21 26° 55° 478 231 77 32 13
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 28° 49° 495 238 77 32 13
03-23 25° 47° 508 241 77 32 13
03-24 32° 40° 522 245 77 32 13
03-25 26° 39° 533 246 77 32 13
03-26 25° 45° 546 249 77 32 13
03-27 30° 52° 565 258 77 32 13
03-28 44° 71° 600 283 93 39 15
03-29 49° 65° 635 308 107 46 17
03-30 45° 71° 671 334 123 54 20
03-31 31° 40° 685 338 123 54 20
04-01 23° 43° 696 339 123 54 20
04-02 35° 61° 722 355 129 54 20
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 40° 63° 751 374 139 56 20
04-04 31° 52° 771 384 139 56 20
04-05 40° 50° 794 397 142 56 20
04-06 32° 46° 811 404 142 56 20
04-07 27° 40° 822 405 142 56 20
04-08 23° 34° 829 405 142 56 20
04-09 27° 46° 843 410 142 56 20
04-10 33° 42° 859 415 142 56 20
04-11 29° 51° 877 423 142 56 20
04-12 27° 57° 897 433 142 56 20
04-13 44° 60° 927 453 152 58 20
04-14 47° 61° 959 476 165 62 20
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 36° 47° 979 485 165 62 20
04-16 34° 48° 998 494 165 62 20
04-17 31° 64° 1023 509 170 62 20
04-18 56° 69° 1063 540 190 75 27
04-19 42° 69° 1097 563 204 80 28
04-20 35° 59° 1122 579 209 80 28
04-21 44° 60° 1152 598 219 82 28
04-22 36° 63° 1179 616 226 82 28
04-23 47° 70° 1216 642 243 90 31
04-24 48° 78° 1257 674 264 104 39
04-25 53° 71° 1297 704 284 116 46
04-26 43° 59° 1326 722 293 117 46
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 36° 67° 1356 742 303 118 46
04-28 48° 78° 1397 773 324 131 54
04-29 48° 77° 1437 804 344 144 62
04-30 38° 62° 1465 822 352 144 62
05-01 47° 71° 1502 849 369 153 66
05-02 43° 58° 1531 867 378 153 66
05-03 42° 58° 1559 885 386 153 66
05-04 41° 60° 1587 904 394 154 66
05-05 47° 67° 1622 929 409 161 68
05-06 48° 63° 1656 952 423 166 68
05-07 44° 75° 1693 980 440 176 73
05-08 45° 59° 1723 1000 450 178 73
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 33° 64° 1749 1016 456 178 73
05-10 42° 73° 1785 1041 472 185 75
05-11 43° 74° 1822 1068 489 194 79
05-12 46° 84° 1865 1101 512 209 89
05-13 63° 73° 1911 1137 538 227 102
05-14 62° 77° 1958 1175 565 246 116
05-15 60° 85° 2009 1215 596 269 134
05-16 56° 84° 2057 1253 624 289 149
05-17 53° 65° 2094 1280 641 298 153
05-18 50° 61° 2128 1304 655 304 154
05-19 41° 57° 2154 1321 661 304 154
05-20 44° 50° 2179 1336 666 304 154
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 47° 50° 2206 1353 673 304 154
05-22 46° 57° 2236 1372 683 305 154
05-23 39° 54° 2260 1386 687 305 154
05-24 37° 60° 2287 1403 694 305 154
05-25 41° 65° 2318 1424 705 308 154
05-26 42° 71° 2352 1448 719 315 155
05-27 52° 73° 2393 1479 740 327 163
05-28 55° 65° 2430 1507 757 337 168
05-29 51° 66° 2467 1533 774 345 171
05-30 46° 70° 2503 1559 790 353 174
05-31 43° 61° 2533 1579 800 356 174
06-01 37° 64° 2562 1598 809 356 174
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 38° 78° 2597 1624 824 364 176
06-03 60° 87° 2649 1665 856 387 195
06-04 62° 78° 2697 1703 884 407 210
06-05 56° 75° 2740 1737 907 423 221
06-06 54° 78° 2785 1771 932 439 232
06-07 53° 79° 2829 1805 956 456 243
06-08 60° 77° 2876 1842 983 474 257
06-09 56° 75° 2919 1875 1006 490 267
06-10 53° 66° 2956 1903 1023 499 272
06-11 51° 83° 3002 1938 1049 516 284
06-12 63° 78° 3051 1977 1078 537 300
06-13 60° 75° 3096 2012 1103 555 312
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 56° 80° 3142 2049 1129 573 325
06-15 56° 81° 3189 2085 1156 592 339
06-16 61° 84° 3240 2126 1187 614 357
06-17 65° 88° 3294 2171 1221 641 378
06-18 68° 84° 3348 2215 1255 667 399
06-19 62° 77° 3396 2252 1283 687 414
06-20 61° 82° 3445 2292 1312 708 431
06-21 74° 94° 3508 2344 1355 742 460
06-22 80° 94° 3573 2399 1400 779 492
06-23 78° 96° 3637 2454 1444 816 524
06-24 72° 92° 3697 2504 1484 848 550
06-25 72° 79° 3751 2548 1518 874 571
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 69° 92° 3809 2596 1556 904 597
06-27 70° 88° 3867 2643 1594 933 621
06-28 65° 81° 3918 2684 1625 957 639
06-29 62° 90° 3972 2728 1659 983 660
06-30 72° 83° 4027 2774 1694 1010 682
07-01 66° 81° 4079 2815 1726 1033 701
07-02 63° 86° 4131 2858 1758 1058 720
07-03 63° 87° 4185 2901 1792 1083 741
07-04 65° 87° 4238 2945 1825 1109 762
07-05 72° 90° 4298 2994 1865 1140 788
07-06 71° 85° 4354 3040 1901 1168 811
07-07 65° 81° 4405 3081 1932 1192 829
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 58° 83° 4454 3120 1961 1212 845
07-09 68° 83° 4507 3164 1994 1238 865
07-10 59° 83° 4557 3203 2024 1259 882
07-11 65° 81° 4608 3244 2055 1282 900
07-12 73° 82° 4664 3290 2091 1310 923
07-13 66° 82° 4716 3332 2123 1335 942
07-14 58° 84° 4765 3372 2152 1356 958
07-15 58° 89° 4817 3413 2184 1379 977
07-16 71° 86° 4873 3460 2220 1408 1000
07-17 62° 74° 4919 3496 2246 1426 1014
07-18 54° 79° 4964 3530 2271 1443 1025
07-19 64° 81° 5014 3571 2301 1465 1042
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 66° 79° 5065 3611 2332 1488 1060
07-21 57° 83° 5113 3649 2360 1507 1075
07-22 62° 84° 5164 3690 2391 1530 1093
07-23 62° 91° 5218 3735 2425 1557 1115
07-24 74° 92° 5279 3786 2466 1590 1142
07-25 72° 83° 5335 3831 2502 1618 1165
07-26 72° 83° 5390 3877 2537 1645 1188
07-27 72° 91° 5450 3926 2577 1676 1214
07-28 71° 88° 5507 3973 2614 1705 1238
07-29 66° 90° 5563 4019 2650 1733 1261
07-30 64° 82° 5614 4060 2681 1756 1279
07-31 60° 77° 5660 4097 2707 1775 1293
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 57° 77° 5706 4132 2733 1792 1305
08-02 51° 79° 5749 4165 2756 1807 1315
08-03 55° 81° 5794 4201 2781 1825 1327
08-04 56° 81° 5841 4237 2808 1844 1341
08-05 60° 83° 5890 4277 2837 1865 1358
08-06 61° 86° 5942 4318 2869 1888 1376
08-07 66° 87° 5996 4363 2903 1915 1398
08-08 70° 90° 6054 4411 2941 1945 1423
08-09 70° 92° 6113 4460 2980 1976 1448
08-10 69° 90° 6171 4508 3018 2006 1473
08-11 72° 85° 6228 4554 3055 2034 1497
08-12 70° 86° 6284 4600 3091 2062 1520
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 69° 83° 6338 4644 3125 2088 1541
08-14 61° 83° 6388 4684 3155 2110 1558
08-15 65° 87° 6442 4728 3189 2137 1579
08-16 71° 89° 6500 4776 3227 2166 1604
08-17 68° 85° 6554 4820 3261 2192 1625
08-18 61° 83° 6604 4860 3291 2215 1642
08-19 66° 75° 6652 4899 3319 2235 1658
08-20 63° 75° 6699 4936 3346 2254 1671
08-21 59° 79° 6746 4972 3373 2273 1685
08-22 56° 79° 6792 5008 3399 2290 1698
08-23 63° 79° 6841 5047 3428 2311 1714
08-24 56° 70° 6882 5078 3449 2324 1722
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 55° 68° 6921 5107 3468 2336 1728
08-26 47° 69° 6957 5133 3484 2343 1731
08-27 44° 74° 6994 5160 3501 2353 1735
08-28 56° 75° 7038 5194 3525 2368 1746
08-29 44° 66° 7071 5217 3538 2373 1746
08-30 42° 73° 7106 5243 3553 2381 1748
08-31 46° 76° 7145 5272 3572 2392 1755
09-01 50° 77° 7187 5303 3594 2406 1763
09-02 51° 79° 7230 5336 3617 2420 1773
09-03 55° 71° 7270 5367 3637 2433 1780
09-04 48° 63° 7304 5390 3651 2438 1781
09-05 52° 62° 7339 5415 3666 2446 1783
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 49° 61° 7372 5438 3679 2451 1783
09-07 42° 65° 7403 5460 3690 2454 1783
09-08 39° 68° 7435 5481 3702 2457 1783
09-09 44° 72° 7471 5507 3718 2465 1786
09-10 51° 78° 7513 5540 3740 2480 1796
09-11 52° 79° 7557 5573 3764 2496 1806
09-12 52° 81° 7601 5607 3788 2512 1817
09-13 56° 75° 7645 5641 3812 2527 1828
09-14 59° 84° 7694 5680 3841 2549 1844
09-15 55° 84° 7741 5718 3868 2568 1859
09-16 54° 81° 7787 5753 3894 2585 1871
09-17 52° 83° 7832 5789 3919 2603 1884
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 56° 85° 7881 5827 3948 2623 1899
09-19 59° 85° 7931 5867 3978 2646 1916
09-20 57° 81° 7978 5904 4005 2665 1931
09-21 60° 76° 8024 5940 4031 2682 1943
09-22 63° 78° 8072 5979 4059 2703 1959
09-23 61° 73° 8117 6014 4084 2720 1971
09-24 59° 70° 8160 6047 4107 2735 1981
09-25 57° 71° 8202 6078 4129 2749 1990
09-26 52° 77° 8245 6111 4152 2763 1999
09-27 55° 82° 8291 6147 4178 2782 2013
09-28 57° 78° 8337 6183 4204 2799 2025
09-29 49° 82° 8380 6217 4227 2815 2036
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 50° 81° 8424 6250 4251 2830 2046
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 31° 37° 12 2 0 0 0
02-16 24° 31° 17 2 0 0 0
02-17 18° 26° 17 2 0 0 0
02-18 24° 33° 24 2 0 0 0
02-19 16° 42° 31 2 0 0 0
02-20 27° 52° 49 9 0 0 0
02-21 39° 62° 77 28 9 1 0
02-22 34° 55° 100 40 11 1 0
02-23 27° 46° 114 45 11 1 0
02-24 15° 31° 115 45 11 1 0
02-25 26° 48° 130 49 11 1 0
02-26 32° 61° 155 64 16 1 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 52° 73° 196 95 37 14 8
02-28 21° 58° 214 103 37 14 8
02-29 17° 35° 218 103 37 14 8
03-01 28° 47° 233 109 37 14 8
03-02 40° 53° 258 123 42 14 8
03-03 39° 66° 288 144 52 16 8
03-04 51° 70° 327 172 71 27 14
03-05 44° 63° 358 194 82 30 14
03-06 35° 51° 379 205 83 30 14
03-07 32° 49° 397 213 83 30 14
03-08 39° 50° 420 226 86 30 14
03-09 33° 47° 438 234 86 30 14
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 30° 37° 450 235 86 30 14
03-11 28° 61° 472 248 89 30 14
03-12 44° 68° 507 272 103 37 15
03-13 44° 70° 542 297 118 44 17
03-14 43° 57° 570 315 126 44 17
03-15 34° 50° 589 325 126 44 17
03-16 32° 53° 610 335 126 44 17
03-17 27° 38° 620 336 126 44 17
03-18 24° 33° 627 336 126 44 17
03-19 31° 44° 642 341 126 44 17
03-20 23° 35° 650 341 126 44 17
03-21 17° 35° 654 341 126 44 17
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 26° 31° 661 341 126 44 17
03-23 24° 35° 668 341 126 44 17
03-24 25° 41° 680 343 126 44 17
03-25 32° 64° 706 359 132 44 17
03-26 40° 62° 735 378 142 45 17
03-27 32° 38° 748 381 142 45 17
03-28 27° 43° 761 384 142 45 17
03-29 24° 50° 776 389 142 45 17
03-30 36° 48° 796 399 142 45 17
03-31 37° 47° 816 409 142 45 17
04-01 37° 55° 840 423 145 45 17
04-02 39° 49° 862 435 147 45 17
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 35° 42° 878 441 147 45 17
04-04 36° 44° 896 449 147 45 17
04-05 35° 48° 916 459 147 45 17
04-06 30° 54° 936 469 148 45 17
04-07 33° 59° 960 483 152 45 17
04-08 44° 71° 996 509 167 52 20
04-09 47° 64° 1030 533 181 58 20
04-10 38° 66° 1060 553 191 60 20
04-11 47° 55° 1089 572 200 61 20
04-12 45° 55° 1117 590 208 61 20
04-13 40° 58° 1144 607 215 61 20
04-14 53° 73° 1185 638 236 74 28
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 47° 68° 1220 663 252 82 31
04-16 46° 69° 1256 689 267 89 33
04-17 58° 70° 1298 720 289 103 42
04-18 48° 55° 1327 740 298 104 42
04-19 42° 52° 1352 755 303 104 42
04-20 36° 45° 1371 763 303 104 42
04-21 35° 47° 1390 772 303 104 42
04-22 36° 63° 1417 790 311 104 42
04-23 49° 61° 1450 813 324 109 42
04-24 36° 49° 1471 824 325 109 42
04-25 29° 57° 1492 835 326 109 42
04-26 36° 64° 1520 853 334 110 42
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 54° 80° 1566 888 360 127 54
04-28 62° 77° 1613 926 387 146 69
04-29 60° 69° 1656 959 410 161 78
04-30 47° 64° 1690 982 423 167 79
05-01 53° 72° 1730 1013 444 179 87
05-02 49° 77° 1771 1044 465 193 95
05-03 56° 70° 1813 1075 486 206 103
05-04 52° 78° 1855 1108 509 221 113
05-05 51° 67° 1893 1135 526 230 117
05-06 48° 71° 1930 1163 544 239 121
05-07 53° 68° 1968 1191 562 250 127
05-08 50° 72° 2007 1220 581 261 133
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 53° 59° 2041 1244 595 266 134
05-10 45° 64° 2074 1267 608 271 134
05-11 48° 59° 2106 1289 620 275 134
05-12 40° 76° 2142 1315 636 283 136
05-13 62° 80° 2190 1353 664 304 152
05-14 57° 63° 2229 1381 682 314 157
05-15 51° 74° 2269 1412 703 326 165
05-16 48° 74° 2309 1441 722 338 171
05-17 58° 77° 2354 1477 748 355 184
05-18 51° 83° 2399 1512 773 373 196
05-19 59° 83° 2448 1551 802 394 212
05-20 52° 82° 2494 1586 827 411 224
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 57° 86° 2543 1626 857 432 241
05-22 61° 79° 2591 1664 885 452 255
05-23 55° 76° 2635 1697 909 468 266
05-24 52° 81° 2679 1732 933 484 277
05-25 55° 71° 2720 1762 953 497 285
05-26 50° 77° 2761 1794 975 510 294
05-27 55° 64° 2799 1822 993 520 299
05-28 53° 68° 2837 1850 1011 530 304
05-29 55° 70° 2878 1880 1031 543 311
05-30 45° 72° 2914 1907 1048 552 315
05-31 46° 78° 2955 1937 1068 564 322
06-01 55° 75° 2997 1970 1091 579 332
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 58° 75° 3042 2005 1116 595 344
06-03 53° 82° 3087 2040 1141 612 356
06-04 66° 86° 3141 2084 1175 638 377
06-05 62° 76° 3188 2121 1202 658 391
06-06 60° 73° 3233 2156 1227 674 403
06-07 58° 70° 3275 2187 1249 688 411
06-08 52° 72° 3315 2218 1269 700 418
06-09 52° 75° 3356 2249 1290 713 427
06-10 51° 69° 3394 2277 1308 724 432
06-11 43° 72° 3430 2303 1324 731 435
06-12 59° 84° 3480 2343 1354 753 451
06-13 70° 85° 3536 2388 1389 781 474
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 63° 83° 3586 2429 1420 804 492
06-15 58° 82° 3634 2467 1448 823 507
06-16 64° 90° 3689 2512 1483 850 529
06-17 70° 92° 3748 2561 1522 881 555
06-18 77° 90° 3810 2612 1563 915 583
06-19 77° 91° 3872 2664 1606 949 612
06-20 72° 88° 3930 2712 1643 979 637
06-21 71° 89° 3987 2760 1681 1009 662
06-22 73° 87° 4045 2808 1719 1038 687
06-23 65° 78° 4095 2848 1749 1060 703
06-24 57° 80° 4142 2885 1776 1079 717
06-25 65° 81° 4193 2926 1807 1102 736
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 68° 81° 4245 2968 1839 1126 755
06-27 55° 73° 4287 3000 1861 1140 764
06-28 62° 73° 4333 3035 1886 1158 776
06-29 68° 81° 4385 3078 1919 1182 796
06-30 57° 75° 4429 3112 1943 1198 807
07-01 46° 76° 4468 3141 1962 1209 812
07-02 56° 75° 4512 3174 1986 1225 823
07-03 71° 82° 4566 3219 2020 1251 845
07-04 66° 81° 4617 3260 2051 1275 863
07-05 63° 81° 4667 3300 2081 1297 880
07-06 63° 74° 4714 3337 2108 1315 894
07-07 56° 84° 4762 3375 2136 1335 909
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 68° 84° 4816 3419 2170 1362 930
07-09 67° 84° 4870 3463 2204 1387 951
07-10 67° 74° 4919 3502 2233 1408 966
07-11 60° 81° 4968 3540 2261 1429 982
07-12 64° 83° 5019 3582 2293 1453 1001
07-13 63° 87° 5072 3625 2326 1477 1021
07-14 68° 86° 5127 3670 2361 1505 1043
07-15 68° 86° 5182 3715 2396 1531 1065
07-16 67° 79° 5233 3756 2427 1554 1083
07-17 64° 78° 5282 3795 2456 1575 1099
07-18 56° 72° 5324 3827 2478 1589 1107
07-19 51° 79° 5366 3859 2500 1604 1117
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 55° 80° 5412 3895 2526 1621 1130
07-21 59° 82° 5460 3933 2554 1642 1145
07-22 62° 81° 5510 3973 2584 1663 1162
07-23 58° 82° 5558 4011 2612 1683 1177
07-24 64° 76° 5606 4049 2640 1703 1192
07-25 55° 77° 5650 4083 2664 1719 1203
07-26 53° 81° 5695 4118 2689 1736 1215
07-27 57° 84° 5743 4156 2717 1757 1230
07-28 59° 86° 5794 4197 2748 1779 1248
07-29 71° 85° 5850 4243 2784 1807 1271
07-30 70° 84° 5905 4288 2819 1834 1293
07-31 67° 85° 5959 4332 2853 1860 1314
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 68° 86° 6014 4377 2888 1887 1336
08-02 71° 86° 6070 4423 2924 1916 1359
08-03 66° 88° 6126 4468 2960 1943 1381
08-04 63° 88° 6179 4512 2993 1968 1402
08-05 69° 79° 6231 4554 3025 1992 1421
08-06 61° 74° 6277 4589 3051 2010 1433
08-07 57° 79° 6323 4626 3077 2028 1447
08-08 56° 79° 6369 4662 3103 2046 1459
08-09 62° 71° 6413 4696 3127 2063 1471
08-10 56° 70° 6455 4727 3148 2076 1479
08-11 57° 75° 6499 4761 3172 2092 1490
08-12 57° 78° 6544 4797 3198 2109 1503
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 57° 82° 6592 4834 3225 2129 1517
08-14 57° 84° 6640 4873 3254 2149 1533
08-15 63° 77° 6688 4911 3282 2169 1548
08-16 67° 83° 6741 4954 3315 2194 1568
08-17 68° 77° 6792 4994 3345 2217 1585
08-18 67° 77° 6842 5035 3376 2239 1603
08-19 58° 73° 6885 5068 3399 2255 1613
08-20 50° 70° 6924 5096 3417 2265 1618
08-21 48° 73° 6962 5125 3436 2275 1624
08-22 50° 75° 7003 5155 3456 2288 1631
08-23 53° 78° 7046 5189 3480 2303 1642
08-24 58° 84° 7095 5228 3509 2325 1658
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 68° 88° 7151 5274 3545 2353 1681
08-26 74° 91° 7212 5325 3586 2385 1709
08-27 74° 91° 7273 5375 3626 2418 1736
08-28 71° 80° 7326 5419 3660 2443 1757
08-29 67° 84° 7379 5462 3693 2469 1777
08-30 70° 84° 7435 5508 3729 2496 1799
08-31 60° 80° 7483 5546 3757 2516 1815
09-01 59° 76° 7528 5581 3782 2533 1827
09-02 48° 73° 7566 5609 3800 2544 1832
09-03 49° 76° 7607 5640 3821 2556 1839
09-04 49° 81° 7650 5673 3844 2571 1850
09-05 56° 83° 7697 5710 3871 2591 1864
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 53° 68° 7736 5739 3890 2601 1870
09-07 46° 62° 7768 5761 3902 2605 1870
09-08 41° 68° 7800 5783 3914 2609 1870
09-09 57° 75° 7844 5817 3938 2625 1880
09-10 52° 80° 7888 5851 3962 2641 1891
09-11 52° 85° 7934 5887 3988 2659 1905
09-12 52° 87° 7982 5925 4016 2679 1919
09-13 58° 85° 8031 5964 4045 2701 1936
09-14 58° 87° 8082 6005 4076 2723 1953
09-15 58° 88° 8133 6046 4107 2746 1972
09-16 56° 87° 8183 6086 4137 2768 1988
09-17 53° 83° 8229 6122 4163 2786 2001
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 51° 84° 8275 6157 4189 2804 2014
09-19 55° 85° 8323 6196 4217 2824 2029
09-20 64° 80° 8373 6235 4247 2846 2046
09-21 60° 85° 8423 6276 4277 2868 2063
09-22 64° 72° 8469 6312 4303 2886 2077
09-23 55° 68° 8509 6341 4322 2898 2083
09-24 58° 68° 8550 6373 4344 2911 2091
09-25 57° 73° 8593 6406 4367 2926 2101
09-26 49° 76° 8633 6436 4387 2938 2109
09-27 56° 76° 8677 6470 4411 2954 2119
09-28 63° 77° 8725 6508 4439 2974 2134
09-29 64° 81° 8775 6548 4469 2996 2151
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 57° 78° 8821 6583 4494 3014 2164

 

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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