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Crabgrass Germination Prediction (GDD 50)
through Sun, Dec. 7. 2025

 
  

Kalamazoo, 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° 32° 4 0 0 0 0
02-16 19° 28° 6 0 0 0 0
02-17 8° 18° 6 0 0 0 0
02-18 2° 15° 6 0 0 0 0
02-19 11° 19° 6 0 0 0 0
02-20 12° 26° 6 0 0 0 0
02-21 20° 29° 8 0 0 0 0
02-22 12° 30° 8 0 0 0 0
02-23 24° 36° 16 0 0 0 0
02-24 35° 48° 36 10 0 0 0
02-25 30° 50° 54 18 0 0 0
02-26 26° 40° 65 19 0 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 33° 42° 81 24 0 0 0
02-28 26° 54° 99 33 0 0 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 19° 33° 103 33 0 0 0
03-02 19° 31° 106 33 0 0 0
03-03 22° 40° 115 33 0 0 0
03-04 37° 47° 134 42 0 0 0
03-05 29° 52° 153 51 0 0 0
03-06 25° 32° 159 51 0 0 0
03-07 27° 37° 169 51 0 0 0
03-08 22° 39° 178 51 0 0 0
03-09 31° 55° 199 62 1 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 37° 66° 229 82 11 2 0
03-11 39° 55° 254 96 16 2 0
03-12 31° 55° 274 107 16 2 0
03-13 30° 64° 299 122 21 2 0
03-14 43° 76° 337 149 39 11 4
03-15 56° 72° 379 182 61 25 14
03-16 30° 56° 400 193 62 25 14
03-17 24° 49° 414 197 62 25 14
03-18 41° 71° 448 221 76 31 15
03-19 48° 70° 485 248 93 40 19
03-20 29° 47° 502 254 93 40 19
03-21 23° 53° 518 260 93 40 19
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 29° 48° 534 267 93 40 19
03-23 25° 44° 547 270 93 40 19
03-24 31° 40° 561 273 93 40 19
03-25 23° 42° 571 274 93 40 19
03-26 23° 48° 584 277 93 40 19
03-27 31° 55° 605 288 94 40 19
03-28 46° 74° 643 315 111 50 23
03-29 57° 68° 683 346 132 62 31
03-30 56° 73° 725 378 154 76 40
03-31 31° 50° 744 387 154 76 40
04-01 23° 44° 755 388 154 76 40
04-02 35° 62° 782 404 161 76 40
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 40° 64° 812 424 171 78 40
04-04 33° 52° 832 435 171 78 40
04-05 41° 48° 855 447 174 78 40
04-06 33° 45° 872 455 174 78 40
04-07 27° 42° 885 457 174 78 40
04-08 24° 35° 892 457 174 78 40
04-09 26° 45° 906 461 174 78 40
04-10 32° 41° 920 466 174 78 40
04-11 27° 50° 937 472 174 78 40
04-12 28° 56° 957 482 174 78 40
04-13 43° 60° 986 502 183 80 40
04-14 47° 64° 1020 525 196 85 40
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 37° 48° 1040 535 197 85 40
04-16 33° 49° 1059 544 197 85 40
04-17 32° 62° 1084 559 202 85 40
04-18 57° 77° 1129 594 227 102 52
04-19 44° 69° 1163 618 241 109 53
04-20 38° 61° 1191 636 249 109 53
04-21 47° 61° 1223 658 261 113 53
04-22 37° 64° 1251 676 269 113 53
04-23 51° 72° 1291 706 289 125 60
04-24 49° 81° 1333 738 311 139 69
04-25 47° 74° 1372 767 330 150 75
04-26 43° 59° 1401 786 339 151 75
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 35° 66° 1430 805 348 152 75
04-28 46° 78° 1470 835 368 164 82
04-29 49° 79° 1512 867 390 178 91
04-30 39° 63° 1541 887 399 179 91
05-01 47° 71° 1578 914 416 188 95
05-02 47° 59° 1609 934 427 191 95
05-03 44° 61° 1640 955 438 194 95
05-04 42° 53° 1665 971 443 194 95
05-05 47° 67° 1700 996 459 201 98
05-06 48° 63° 1734 1019 472 206 98
05-07 44° 76° 1772 1047 490 216 103
05-08 46° 63° 1804 1070 502 221 103
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 33° 66° 1832 1087 510 221 103
05-10 42° 72° 1867 1112 525 228 105
05-11 45° 74° 1905 1140 543 238 110
05-12 46° 82° 1947 1172 565 252 119
05-13 62° 70° 1991 1206 589 268 130
05-14 61° 75° 2037 1242 615 286 143
05-15 60° 84° 2087 1282 645 308 160
05-16 58° 83° 2136 1321 674 329 176
05-17 54° 65° 2173 1349 691 338 180
05-18 49° 63° 2207 1373 706 344 181
05-19 41° 60° 2236 1391 714 345 181
05-20 44° 52° 2262 1408 721 345 181
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 47° 53° 2291 1426 729 346 181
05-22 45° 57° 2320 1445 738 347 181
05-23 39° 55° 2345 1460 743 347 181
05-24 37° 62° 2372 1477 750 347 181
05-25 45° 66° 2406 1501 764 352 182
05-26 42° 70° 2439 1524 777 358 183
05-27 52° 73° 2480 1555 798 370 190
05-28 55° 63° 2516 1582 815 379 194
05-29 52° 66° 2553 1608 831 388 197
05-30 46° 71° 2590 1635 848 396 201
05-31 44° 63° 2621 1657 859 400 201
06-01 38° 66° 2651 1676 869 402 201
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 38° 79° 2688 1703 886 410 205
06-03 59° 86° 2738 1744 917 433 222
06-04 62° 77° 2786 1781 944 453 237
06-05 57° 70° 2827 1813 966 466 245
06-06 57° 74° 2871 1846 989 482 256
06-07 54° 77° 2915 1880 1013 497 267
06-08 59° 77° 2961 1916 1039 515 280
06-09 53° 74° 3003 1948 1061 529 289
06-10 50° 69° 3041 1976 1079 539 293
06-11 55° 85° 3089 2014 1107 559 308
06-12 65° 83° 3141 2056 1139 583 327
06-13 62° 68° 3183 2088 1161 598 337
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 58° 74° 3227 2123 1186 614 348
06-15 57° 81° 3274 2159 1212 633 362
06-16 61° 83° 3324 2199 1242 655 379
06-17 66° 87° 3379 2244 1277 681 400
06-18 66° 83° 3431 2286 1309 706 420
06-19 62° 77° 3479 2324 1337 725 434
06-20 61° 81° 3528 2363 1366 746 450
06-21 72° 92° 3588 2413 1406 778 477
06-22 78° 93° 3651 2466 1449 813 508
06-23 76° 94° 3714 2519 1492 848 538
06-24 75° 90° 3774 2569 1532 881 565
06-25 73° 84° 3831 2616 1569 909 589
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 72° 88° 3889 2664 1607 939 614
06-27 70° 88° 3946 2711 1644 968 637
06-28 66° 80° 3997 2752 1675 991 655
06-29 62° 87° 4049 2795 1708 1016 675
06-30 72° 81° 4104 2839 1742 1043 697
07-01 66° 79° 4155 2880 1773 1065 715
07-02 61° 84° 4206 2921 1804 1088 732
07-03 62° 86° 4258 2963 1836 1112 751
07-04 65° 83° 4310 3005 1868 1136 770
07-05 71° 90° 4368 3053 1906 1166 796
07-06 72° 87° 4425 3100 1943 1196 820
07-07 65° 80° 4475 3141 1974 1218 837
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 57° 83° 4524 3179 2002 1238 852
07-09 70° 82° 4577 3223 2036 1264 873
07-10 61° 82° 4627 3262 2065 1285 890
07-11 69° 85° 4682 3307 2100 1313 912
07-12 74° 84° 4739 3354 2137 1341 936
07-13 66° 82° 4791 3396 2169 1365 955
07-14 57° 83° 4839 3434 2197 1385 970
07-15 59° 87° 4890 3475 2228 1409 988
07-16 71° 85° 4946 3521 2264 1436 1011
07-17 61° 71° 4990 3556 2288 1453 1022
07-18 56° 75° 5034 3590 2312 1469 1033
07-19 64° 79° 5084 3629 2342 1490 1049
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 66° 78° 5134 3669 2372 1512 1066
07-21 57° 80° 5181 3706 2399 1531 1080
07-22 63° 82° 5231 3746 2429 1553 1098
07-23 61° 89° 5284 3789 2462 1578 1118
07-24 72° 94° 5345 3840 2503 1611 1146
07-25 71° 82° 5400 3885 2538 1638 1167
07-26 72° 79° 5453 3928 2571 1664 1188
07-27 73° 89° 5512 3977 2610 1694 1213
07-28 71° 86° 5568 4024 2647 1723 1237
07-29 66° 88° 5623 4069 2682 1750 1259
07-30 65° 83° 5676 4111 2714 1774 1278
07-31 59° 76° 5721 4146 2739 1792 1291
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 56° 75° 5765 4180 2763 1807 1302
08-02 52° 76° 5807 4212 2785 1821 1311
08-03 53° 78° 5851 4246 2809 1837 1321
08-04 54° 79° 5895 4280 2833 1854 1333
08-05 59° 82° 5944 4319 2862 1874 1349
08-06 61° 84° 5994 4359 2892 1897 1366
08-07 66° 87° 6049 4404 2927 1923 1387
08-08 68° 89° 6105 4450 2963 1951 1411
08-09 68° 91° 6162 4497 3000 1981 1435
08-10 68° 90° 6219 4545 3038 2010 1459
08-11 71° 88° 6277 4592 3075 2040 1484
08-12 69° 87° 6333 4638 3111 2067 1507
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 67° 84° 6386 4682 3144 2093 1527
08-14 60° 84° 6436 4721 3174 2115 1544
08-15 64° 87° 6489 4765 3208 2140 1564
08-16 70° 89° 6547 4812 3245 2170 1589
08-17 70° 85° 6603 4858 3281 2198 1612
08-18 61° 83° 6653 4898 3311 2220 1629
08-19 65° 76° 6702 4937 3340 2240 1644
08-20 63° 70° 6746 4971 3364 2256 1656
08-21 58° 73° 6789 5004 3387 2272 1666
08-22 53° 79° 6834 5039 3412 2288 1677
08-23 62° 81° 6883 5078 3441 2310 1694
08-24 55° 71° 6924 5109 3462 2323 1702
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 54° 67° 6963 5138 3481 2333 1707
08-26 48° 68° 6999 5164 3497 2341 1711
08-27 43° 74° 7035 5190 3513 2350 1714
08-28 54° 74° 7078 5223 3536 2364 1723
08-29 44° 66° 7110 5245 3548 2369 1723
08-30 42° 72° 7146 5271 3564 2376 1726
08-31 46° 75° 7184 5299 3582 2387 1731
09-01 47° 77° 7224 5329 3602 2399 1738
09-02 50° 79° 7267 5362 3625 2413 1748
09-03 53° 74° 7308 5394 3647 2427 1757
09-04 48° 64° 7342 5418 3660 2433 1757
09-05 48° 64° 7377 5442 3675 2439 1759
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 47° 62° 7409 5464 3687 2443 1759
09-07 44° 64° 7441 5486 3699 2447 1759
09-08 38° 68° 7472 5507 3710 2450 1759
09-09 44° 74° 7509 5534 3727 2459 1762
09-10 52° 77° 7551 5567 3749 2474 1772
09-11 48° 79° 7593 5598 3771 2487 1780
09-12 51° 81° 7636 5632 3794 2503 1791
09-13 55° 74° 7679 5664 3817 2517 1800
09-14 61° 83° 7729 5704 3847 2539 1818
09-15 54° 84° 7776 5741 3874 2558 1832
09-16 54° 80° 7821 5776 3899 2576 1844
09-17 51° 82° 7866 5811 3924 2592 1855
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 52° 85° 7912 5847 3950 2611 1869
09-19 59° 86° 7963 5888 3981 2633 1886
09-20 61° 84° 8013 5929 4011 2656 1904
09-21 61° 77° 8060 5965 4038 2675 1918
09-22 62° 76° 8108 6003 4066 2694 1932
09-23 60° 70° 8151 6036 4089 2709 1942
09-24 62° 70° 8195 6070 4113 2725 1953
09-25 57° 72° 8237 6102 4135 2740 1963
09-26 52° 77° 8279 6135 4157 2754 1972
09-27 55° 83° 8327 6172 4185 2773 1986
09-28 55° 80° 8372 6207 4210 2791 1999
09-29 54° 82° 8418 6244 4237 2809 2012
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 51° 81° 8462 6278 4261 2825 2023
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 31° 38° 12 2 0 0 0
02-16 23° 31° 18 2 0 0 0
02-17 17° 24° 18 2 0 0 0
02-18 17° 36° 22 2 0 0 0
02-19 15° 44° 30 2 0 0 0
02-20 22° 52° 45 8 0 0 0
02-21 38° 62° 73 26 8 0 0
02-22 37° 57° 98 41 13 0 0
02-23 29° 50° 116 48 13 0 0
02-24 16° 31° 118 48 13 0 0
02-25 26° 55° 136 56 13 0 0
02-26 33° 63° 162 73 19 0 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 54° 72° 203 103 40 13 8
02-28 18° 60° 220 110 40 13 8
02-29 17° 37° 225 110 40 13 8
03-01 27° 46° 239 114 40 13 8
03-02 39° 52° 263 128 44 13 8
03-03 40° 66° 294 149 55 16 8
03-04 51° 71° 333 178 74 27 14
03-05 43° 63° 364 199 85 30 14
03-06 36° 48° 384 210 85 30 14
03-07 32° 47° 402 217 85 30 14
03-08 37° 52° 425 230 88 30 14
03-09 32° 51° 445 240 88 30 14
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 30° 36° 456 241 88 30 14
03-11 26° 61° 478 253 90 30 14
03-12 46° 69° 513 278 105 38 16
03-13 48° 70° 550 306 123 47 20
03-14 42° 61° 580 325 132 48 20
03-15 34° 52° 601 336 133 48 20
03-16 32° 58° 624 349 136 48 20
03-17 29° 41° 637 352 136 48 20
03-18 22° 32° 643 352 136 48 20
03-19 27° 46° 658 357 136 48 20
03-20 24° 36° 666 357 136 48 20
03-21 17° 36° 671 357 136 48 20
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 28° 35° 680 357 136 48 20
03-23 27° 36° 689 357 136 48 20
03-24 22° 43° 700 358 136 48 20
03-25 33° 66° 727 376 144 48 20
03-26 41° 61° 757 395 153 49 20
03-27 31° 39° 770 398 153 49 20
03-28 27° 46° 784 402 153 49 20
03-29 23° 53° 800 408 153 49 20
03-30 40° 56° 825 424 159 49 20
03-31 38° 51° 848 436 161 49 20
04-01 40° 56° 874 452 167 49 20
04-02 40° 50° 898 466 171 49 20
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 35° 40° 913 471 171 49 20
04-04 35° 43° 930 478 171 49 20
04-05 35° 48° 949 488 171 49 20
04-06 30° 57° 971 499 172 49 20
04-07 34° 58° 995 513 176 49 20
04-08 44° 73° 1031 539 192 58 24
04-09 49° 68° 1068 566 209 67 28
04-10 39° 65° 1098 586 219 68 28
04-11 47° 54° 1126 604 227 68 28
04-12 45° 55° 1154 622 235 68 28
04-13 39° 59° 1181 639 242 68 28
04-14 54° 74° 1223 671 264 82 36
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 50° 68° 1260 698 281 91 40
04-16 47° 71° 1297 725 298 100 45
04-17 56° 68° 1337 755 318 112 52
04-18 48° 58° 1368 776 329 115 52
04-19 44° 52° 1394 792 335 115 52
04-20 36° 44° 1412 800 335 115 52
04-21 35° 46° 1430 809 335 115 52
04-22 36° 64° 1458 826 343 115 52
04-23 50° 56° 1489 848 354 118 52
04-24 35° 48° 1509 857 354 118 52
04-25 29° 56° 1530 868 355 118 52
04-26 36° 62° 1557 885 362 118 52
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 53° 80° 1601 919 386 135 63
04-28 62° 77° 1649 957 414 154 77
04-29 61° 70° 1692 990 437 170 88
04-30 47° 66° 1727 1015 452 176 89
05-01 55° 77° 1770 1048 476 192 100
05-02 49° 76° 1811 1079 496 205 108
05-03 59° 69° 1853 1111 518 219 117
05-04 54° 77° 1896 1145 542 234 127
05-05 51° 64° 1932 1170 557 242 130
05-06 48° 71° 1970 1198 575 251 134
05-07 55° 69° 2009 1228 595 263 141
05-08 49° 75° 2049 1257 615 275 148
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 51° 60° 2083 1281 628 281 149
05-10 47° 64° 2117 1305 642 286 150
05-11 48° 58° 2148 1326 653 289 150
05-12 40° 76° 2183 1351 668 297 152
05-13 63° 80° 2233 1391 698 318 169
05-14 59° 70° 2275 1423 720 332 178
05-15 53° 74° 2316 1454 741 346 186
05-16 50° 75° 2356 1484 761 358 193
05-17 57° 79° 2402 1520 787 376 206
05-18 53° 83° 2448 1556 813 393 219
05-19 62° 84° 2499 1597 844 417 237
05-20 55° 85° 2547 1635 872 437 252
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 59° 86° 2598 1676 903 459 270
05-22 62° 79° 2646 1714 931 480 285
05-23 54° 77° 2690 1748 955 495 296
05-24 53° 80° 2734 1783 980 512 307
05-25 56° 72° 2777 1815 1002 526 317
05-26 52° 77° 2819 1847 1024 540 326
05-27 56° 65° 2857 1875 1042 550 331
05-28 53° 68° 2895 1903 1061 561 336
05-29 55° 68° 2935 1933 1080 573 343
05-30 47° 71° 2972 1960 1097 582 347
05-31 47° 76° 3012 1990 1117 593 354
06-01 54° 75° 3054 2022 1139 607 363
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 59° 72° 3097 2055 1162 623 373
06-03 53° 82° 3143 2091 1188 640 386
06-04 64° 85° 3195 2133 1221 665 405
06-05 62° 78° 3243 2171 1249 685 420
06-06 60° 76° 3289 2207 1274 703 433
06-07 56° 72° 3331 2239 1297 717 442
06-08 51° 77° 3373 2271 1318 731 451
06-09 53° 75° 3415 2303 1340 744 460
06-10 51° 68° 3452 2330 1357 754 464
06-11 44° 73° 3489 2357 1374 762 468
06-12 60° 85° 3539 2398 1405 785 485
06-13 69° 88° 3596 2444 1441 813 509
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 62° 82° 3646 2484 1471 835 526
06-15 59° 81° 3693 2521 1498 855 540
06-16 63° 89° 3747 2565 1532 881 561
06-17 70° 91° 3806 2614 1571 911 587
06-18 76° 88° 3865 2663 1611 943 613
06-19 75° 90° 3926 2714 1651 976 641
06-20 71° 89° 3984 2762 1689 1006 666
06-21 72° 89° 4042 2810 1728 1036 691
06-22 74° 89° 4101 2860 1767 1067 717
06-23 64° 82° 4152 2900 1797 1090 735
06-24 59° 80° 4200 2938 1825 1109 750
06-25 66° 82° 4252 2980 1857 1133 769
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 66° 80° 4303 3021 1888 1157 787
06-27 56° 73° 4346 3054 1911 1171 797
06-28 60° 73° 4390 3088 1936 1188 808
06-29 68° 83° 4444 3132 1969 1214 829
06-30 58° 74° 4488 3166 1993 1230 840
07-01 48° 74° 4527 3195 2012 1241 846
07-02 57° 78° 4572 3230 2037 1258 858
07-03 69° 84° 4627 3275 2072 1284 880
07-04 63° 80° 4676 3314 2101 1306 896
07-05 61° 82° 4726 3354 2131 1327 913
07-06 62° 75° 4773 3391 2158 1346 927
07-07 57° 84° 4821 3429 2186 1367 942
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 68° 85° 4875 3473 2221 1393 963
07-09 67° 81° 4928 3516 2253 1417 983
07-10 65° 75° 4976 3554 2281 1437 998
07-11 61° 81° 5025 3593 2310 1459 1014
07-12 65° 83° 5077 3635 2342 1483 1033
07-13 65° 86° 5130 3678 2375 1508 1053
07-14 68° 82° 5183 3721 2408 1533 1073
07-15 69° 85° 5238 3766 2443 1560 1095
07-16 67° 82° 5291 3809 2476 1584 1115
07-17 63° 79° 5340 3848 2505 1605 1131
07-18 56° 72° 5382 3880 2527 1619 1140
07-19 52° 77° 5424 3912 2549 1634 1149
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 55° 79° 5469 3947 2574 1650 1161
07-21 58° 80° 5516 3984 2601 1669 1175
07-22 63° 79° 5565 4023 2630 1690 1191
07-23 59° 81° 5613 4061 2658 1710 1206
07-24 63° 75° 5660 4098 2685 1730 1220
07-25 57° 77° 5705 4133 2710 1747 1232
07-26 55° 78° 5750 4168 2735 1763 1244
07-27 56° 81° 5796 4204 2761 1782 1257
07-28 60° 84° 5846 4244 2791 1804 1274
07-29 71° 84° 5901 4289 2827 1831 1296
07-30 69° 84° 5956 4334 2861 1857 1318
07-31 66° 85° 6009 4378 2895 1883 1338
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 69° 84° 6064 4422 2929 1910 1360
08-02 69° 82° 6117 4465 2962 1935 1380
08-03 65° 87° 6171 4509 2996 1961 1401
08-04 63° 86° 6224 4552 3029 1985 1421
08-05 71° 81° 6278 4596 3063 2011 1442
08-06 64° 75° 6325 4634 3091 2031 1456
08-07 58° 78° 6371 4669 3116 2049 1469
08-08 56° 80° 6417 4705 3142 2067 1482
08-09 62° 71° 6462 4740 3167 2084 1494
08-10 56° 71° 6504 4772 3189 2097 1503
08-11 55° 74° 6546 4804 3212 2112 1512
08-12 56° 79° 6592 4840 3237 2129 1525
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 55° 81° 6638 4876 3263 2148 1538
08-14 58° 83° 6686 4915 3292 2168 1553
08-15 64° 71° 6732 4950 3318 2186 1566
08-16 66° 84° 6785 4993 3351 2211 1586
08-17 68° 76° 6835 5033 3381 2233 1603
08-18 67° 76° 6885 5073 3410 2254 1620
08-19 59° 73° 6929 5107 3434 2270 1631
08-20 50° 70° 6967 5135 3452 2280 1636
08-21 48° 73° 7005 5163 3470 2291 1641
08-22 50° 76° 7046 5194 3491 2303 1649
08-23 51° 79° 7089 5227 3514 2319 1659
08-24 56° 86° 7138 5266 3543 2340 1675
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 69° 90° 7195 5313 3580 2369 1699
08-26 73° 92° 7255 5363 3621 2401 1726
08-27 75° 94° 7318 5416 3663 2435 1756
08-28 71° 83° 7373 5461 3698 2463 1778
08-29 67° 84° 7427 5505 3732 2488 1799
08-30 69° 85° 7482 5550 3767 2516 1821
08-31 63° 81° 7532 5590 3797 2538 1838
09-01 61° 78° 7580 5628 3825 2557 1853
09-02 48° 72° 7618 5656 3843 2567 1858
09-03 47° 75° 7657 5685 3862 2579 1864
09-04 49° 81° 7700 5718 3885 2594 1874
09-05 57° 85° 7749 5757 3914 2614 1890
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 55° 71° 7790 5788 3935 2627 1898
09-07 45° 63° 7822 5810 3947 2631 1898
09-08 40° 69° 7854 5832 3960 2636 1898
09-09 53° 77° 7897 5865 3982 2651 1907
09-10 53° 81° 7942 5900 4007 2668 1919
09-11 50° 85° 7988 5936 4033 2685 1932
09-12 53° 87° 8036 5974 4061 2705 1947
09-13 59° 85° 8086 6014 4091 2728 1964
09-14 59° 87° 8137 6055 4122 2751 1982
09-15 59° 88° 8188 6097 4154 2774 2001
09-16 55° 87° 8238 6136 4183 2795 2017
09-17 54° 83° 8284 6172 4209 2814 2030
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 54° 85° 8331 6209 4237 2833 2045
09-19 57° 85° 8381 6249 4266 2854 2061
09-20 63° 84° 8432 6290 4297 2877 2079
09-21 57° 86° 8481 6329 4327 2899 2096
09-22 63° 74° 8528 6366 4353 2917 2109
09-23 57° 67° 8568 6396 4373 2929 2116
09-24 61° 69° 8611 6429 4396 2944 2126
09-25 57° 71° 8653 6461 4418 2959 2135
09-26 51° 73° 8693 6491 4438 2971 2143
09-27 59° 73° 8737 6525 4462 2987 2154
09-28 61° 71° 8781 6560 4487 3003 2165
09-29 63° 74° 8828 6596 4513 3022 2178
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 58° 76° 8873 6631 4538 3038 2190

 

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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