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Crabgrass/Annual Bluegrass Preemergence Timer (GDD 32)
through Sat, Dec. 13. 2025

 
  

Brighton, 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 19° 31° 3 0 0 0 0
02-16 20° 28° 5 0 0 0 0
02-17 4° 21° 5 0 0 0 0
02-18 -3° 15° 5 0 0 0 0
02-19 -0° 17° 5 0 0 0 0
02-20 13° 22° 5 0 0 0 0
02-21 21° 31° 9 0 0 0 0
02-22 13° 29° 9 0 0 0 0
02-23 19° 36° 15 0 0 0 0
02-24 31° 50° 33 9 0 0 0
02-25 35° 53° 55 21 2 0 0
02-26 26° 37° 65 21 2 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 34° 42° 81 26 2 0 0
02-28 29° 54° 100 36 2 0 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 20° 37° 107 36 2 0 0
03-02 15° 29° 107 36 2 0 0
03-03 16° 38° 112 36 2 0 0
03-04 33° 45° 129 43 2 0 0
03-05 34° 54° 151 55 4 0 0
03-06 25° 34° 159 55 4 0 0
03-07 28° 36° 169 55 4 0 0
03-08 21° 36° 176 55 4 0 0
03-09 32° 54° 197 66 5 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 34° 64° 223 83 12 0 0
03-11 34° 55° 246 95 14 0 0
03-12 29° 47° 262 101 14 0 0
03-13 27° 58° 282 111 14 0 0
03-14 35° 71° 313 132 25 3 0
03-15 56° 71° 355 164 47 17 9
03-16 30° 57° 376 175 48 17 9
03-17 26° 45° 389 178 48 17 9
03-18 35° 67° 418 197 57 18 9
03-19 53° 71° 458 227 77 30 16
03-20 31° 55° 479 238 78 30 16
03-21 24° 51° 495 244 78 30 16
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 28° 47° 510 250 78 30 16
03-23 24° 39° 520 250 78 30 16
03-24 33° 41° 535 255 78 30 16
03-25 29° 43° 549 259 78 30 16
03-26 27° 44° 562 262 78 30 16
03-27 25° 54° 580 270 78 30 16
03-28 40° 66° 611 291 90 33 16
03-29 57° 67° 651 321 109 45 22
03-30 54° 67° 690 349 128 55 28
03-31 36° 56° 714 363 132 55 28
04-01 25° 42° 725 365 132 55 28
04-02 33° 51° 745 375 132 55 28
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 43° 63° 776 396 143 58 28
04-04 35° 51° 797 407 144 58 28
04-05 41° 49° 820 420 147 58 28
04-06 33° 44° 837 427 147 58 28
04-07 27° 45° 851 431 147 58 28
04-08 23° 36° 859 431 147 58 28
04-09 22° 45° 870 432 147 58 28
04-10 32° 37° 882 435 147 58 28
04-11 30° 51° 901 443 147 58 28
04-12 29° 55° 921 453 147 58 28
04-13 38° 56° 946 468 152 58 28
04-14 45° 70° 981 493 168 66 30
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 39° 50° 1004 506 170 66 30
04-16 34° 51° 1024 517 171 66 30
04-17 31° 61° 1048 530 175 66 30
04-18 49° 79° 1090 562 197 80 39
04-19 48° 68° 1126 589 213 88 42
04-20 38° 57° 1152 604 219 88 42
04-21 46° 69° 1188 630 234 95 45
04-22 40° 64° 1218 650 244 97 45
04-23 46° 75° 1256 679 263 108 50
04-24 48° 82° 1299 711 285 123 60
04-25 53° 78° 1342 745 309 138 70
04-26 43° 59° 1371 764 318 139 70
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 36° 66° 1400 782 327 140 70
04-28 42° 74° 1436 808 343 148 73
04-29 51° 82° 1481 843 367 165 85
04-30 36° 64° 1509 861 375 165 85
05-01 44° 70° 1544 886 391 172 88
05-02 54° 67° 1583 915 409 183 93
05-03 45° 54° 1610 933 417 183 93
05-04 40° 54° 1635 948 422 183 93
05-05 48° 67° 1671 973 437 190 96
05-06 52° 61° 1706 998 452 197 97
05-07 52° 74° 1747 1029 473 210 105
05-08 42° 58° 1775 1047 482 210 105
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 35° 64° 1802 1064 489 210 105
05-10 45° 77° 1841 1093 507 221 111
05-11 44° 68° 1875 1117 522 227 112
05-12 45° 80° 1915 1148 542 239 120
05-13 61° 67° 1958 1180 564 254 129
05-14 59° 75° 2002 1215 589 270 141
05-15 58° 82° 2050 1253 617 290 156
05-16 58° 82° 2098 1291 645 310 171
05-17 55° 71° 2139 1322 666 323 179
05-18 52° 63° 2175 1347 682 331 181
05-19 47° 59° 2206 1368 692 334 181
05-20 39° 54° 2230 1383 697 334 181
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 48° 51° 2258 1400 705 334 181
05-22 47° 52° 2286 1418 712 334 181
05-23 40° 53° 2310 1433 717 334 181
05-24 41° 61° 2339 1452 726 335 181
05-25 39° 65° 2369 1472 736 337 181
05-26 42° 70° 2403 1495 750 343 182
05-27 50° 72° 2442 1524 769 354 188
05-28 53° 59° 2476 1548 782 359 189
05-29 55° 64° 2513 1576 800 369 194
05-30 49° 75° 2553 1606 820 381 201
05-31 50° 63° 2588 1630 835 388 202
06-01 40° 67° 2619 1652 846 391 202
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 43° 78° 2657 1680 864 401 207
06-03 54° 86° 2705 1718 892 421 222
06-04 66° 81° 2757 1759 923 445 241
06-05 56° 68° 2797 1789 943 457 248
06-06 58° 76° 2842 1824 969 474 260
06-07 54° 77° 2886 1858 992 489 271
06-08 58° 77° 2931 1893 1018 507 283
06-09 57° 76° 2975 1928 1042 523 294
06-10 51° 72° 3015 1957 1061 535 301
06-11 52° 84° 3061 1993 1087 553 314
06-12 61° 75° 3107 2029 1114 571 327
06-13 57° 71° 3149 2062 1136 585 336
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 57° 76° 3194 2096 1160 601 348
06-15 55° 80° 3239 2132 1186 619 360
06-16 58° 82° 3287 2169 1214 639 375
06-17 62° 87° 3340 2212 1247 664 395
06-18 67° 80° 3391 2254 1278 687 413
06-19 62° 74° 3437 2290 1304 705 426
06-20 58° 78° 3484 2326 1330 723 440
06-21 67° 89° 3540 2372 1366 752 463
06-22 77° 92° 3602 2425 1409 786 492
06-23 74° 93° 3663 2476 1450 819 520
06-24 73° 90° 3723 2525 1490 851 547
06-25 71° 82° 3777 2570 1524 877 568
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 66° 83° 3830 2612 1556 901 588
06-27 71° 89° 3888 2660 1594 931 613
06-28 68° 78° 3939 2701 1625 954 631
06-29 61° 85° 3990 2742 1656 978 649
06-30 68° 83° 4043 2786 1690 1003 669
07-01 70° 82° 4097 2830 1724 1029 690
07-02 61° 84° 4148 2870 1754 1052 708
07-03 64° 84° 4200 2912 1786 1076 727
07-04 61° 86° 4252 2954 1818 1099 746
07-05 68° 89° 4308 3001 1855 1128 769
07-06 70° 90° 4366 3049 1893 1158 794
07-07 63° 75° 4413 3086 1920 1177 808
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 56° 83° 4461 3123 1947 1196 823
07-09 68° 79° 4512 3164 1979 1220 841
07-10 64° 83° 4563 3206 2010 1243 859
07-11 65° 83° 4615 3248 2042 1267 878
07-12 71° 85° 4671 3294 2078 1295 901
07-13 69° 85° 4727 3339 2113 1322 924
07-14 62° 82° 4777 3379 2143 1344 941
07-15 62° 86° 4829 3421 2175 1368 960
07-16 70° 85° 4884 3467 2211 1396 982
07-17 65° 75° 4933 3505 2239 1416 998
07-18 55° 76° 4976 3538 2262 1432 1008
07-19 59° 81° 5024 3576 2290 1451 1023
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 64° 77° 5072 3615 2319 1472 1038
07-21 56° 77° 5117 3649 2343 1489 1050
07-22 53° 82° 5162 3685 2369 1506 1062
07-23 57° 87° 5212 3725 2399 1528 1079
07-24 72° 94° 5273 3775 2440 1561 1107
07-25 70° 84° 5328 3820 2475 1588 1129
07-26 70° 80° 5381 3863 2508 1613 1149
07-27 73° 88° 5439 3912 2546 1643 1174
07-28 68° 87° 5495 3958 2582 1671 1197
07-29 69° 86° 5550 4003 2617 1698 1219
07-30 63° 85° 5602 4045 2649 1722 1238
07-31 60° 74° 5647 4080 2674 1739 1250
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 56° 75° 5691 4114 2698 1755 1261
08-02 52° 77° 5734 4146 2720 1769 1271
08-03 55° 79° 5779 4181 2745 1786 1283
08-04 56° 81° 5825 4217 2772 1805 1296
08-05 62° 83° 5875 4258 2802 1827 1313
08-06 64° 84° 5927 4300 2834 1851 1332
08-07 64° 84° 5980 4342 2866 1875 1352
08-08 66° 87° 6034 4387 2901 1902 1373
08-09 68° 89° 6091 4433 2937 1930 1397
08-10 68° 90° 6148 4480 2974 1959 1421
08-11 69° 89° 6205 4527 3011 1988 1445
08-12 69° 89° 6262 4574 3048 2017 1469
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 68° 82° 6314 4617 3081 2042 1488
08-14 61° 84° 6365 4658 3112 2065 1506
08-15 63° 86° 6417 4700 3144 2089 1525
08-16 67° 89° 6473 4746 3180 2117 1548
08-17 63° 81° 6523 4786 3210 2139 1565
08-18 54° 80° 6568 4821 3235 2156 1577
08-19 65° 75° 6616 4858 3263 2176 1592
08-20 64° 69° 6661 4893 3287 2192 1604
08-21 62° 74° 6706 4929 3313 2210 1616
08-22 54° 80° 6752 4964 3338 2227 1629
08-23 63° 78° 6800 5003 3367 2248 1644
08-24 55° 74° 6843 5035 3389 2263 1654
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 52° 67° 6881 5063 3407 2272 1659
08-26 46° 69° 6916 5089 3423 2280 1661
08-27 45° 73° 6953 5115 3440 2289 1665
08-28 51° 71° 6992 5144 3459 2300 1671
08-29 47° 65° 7026 5168 3473 2306 1672
08-30 43° 72° 7062 5194 3488 2313 1675
08-31 46° 75° 7100 5223 3507 2324 1680
09-01 47° 78° 7141 5253 3527 2336 1688
09-02 49° 79° 7183 5285 3550 2351 1697
09-03 53° 80° 7227 5320 3574 2367 1708
09-04 50° 66° 7263 5346 3590 2375 1711
09-05 46° 70° 7299 5372 3606 2383 1714
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 49° 63° 7333 5396 3620 2389 1715
09-07 41° 67° 7365 5417 3631 2393 1715
09-08 40° 69° 7398 5440 3644 2398 1715
09-09 44° 74° 7435 5468 3662 2407 1719
09-10 50° 77° 7477 5499 3683 2421 1728
09-11 49° 80° 7519 5532 3706 2435 1738
09-12 50° 80° 7562 5565 3729 2450 1748
09-13 53° 79° 7606 5599 3753 2466 1759
09-14 54° 83° 7652 5635 3779 2484 1772
09-15 53° 82° 7698 5670 3805 2502 1784
09-16 52° 83° 7743 5706 3830 2519 1797
09-17 51° 83° 7788 5741 3855 2536 1809
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 53° 86° 7836 5778 3882 2555 1823
09-19 61° 81° 7884 5817 3911 2576 1839
09-20 56° 80° 7931 5853 3937 2594 1852
09-21 59° 70° 7973 5886 3960 2609 1862
09-22 61° 77° 8020 5923 3987 2628 1875
09-23 60° 72° 8064 5957 4011 2644 1886
09-24 63° 74° 8110 5993 4037 2662 1900
09-25 61° 75° 8156 6029 4063 2680 1913
09-26 55° 79° 8201 6064 4088 2697 1925
09-27 54° 85° 8249 6101 4116 2717 1939
09-28 59° 81° 8297 6139 4143 2737 1954
09-29 49° 82° 8341 6173 4167 2752 1965
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 50° 83° 8385 6208 4192 2769 1976
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 29° 37° 11 1 0 0 0
02-16 24° 29° 16 1 0 0 0
02-17 18° 26° 16 1 0 0 0
02-18 18° 35° 20 1 0 0 0
02-19 18° 39° 27 1 0 0 0
02-20 24° 48° 41 5 0 0 0
02-21 30° 59° 63 18 3 0 0
02-22 34° 52° 85 29 4 0 0
02-23 25° 49° 99 34 4 0 0
02-24 19° 32° 103 34 4 0 0
02-25 24° 49° 117 38 4 0 0
02-26 33° 54° 139 50 5 0 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 42° 72° 174 74 20 7 2
02-28 22° 59° 193 83 20 7 2
02-29 20° 36° 199 83 20 7 2
03-01 26° 45° 212 87 20 7 2
03-02 37° 51° 235 99 22 7 2
03-03 33° 60° 259 114 27 7 2
03-04 41° 70° 293 137 41 12 2
03-05 41° 56° 320 154 47 12 2
03-06 36° 45° 338 163 47 12 2
03-07 34° 52° 359 174 49 12 2
03-08 40° 51° 383 187 52 12 2
03-09 34° 54° 405 199 54 12 2
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 29° 38° 417 201 54 12 2
03-11 27° 55° 435 210 54 12 2
03-12 41° 68° 468 232 67 17 2
03-13 47° 69° 504 259 83 25 5
03-14 45° 54° 532 276 91 25 5
03-15 38° 48° 553 287 92 25 5
03-16 32° 57° 575 300 94 25 5
03-17 29° 42° 589 304 94 25 5
03-18 25° 33° 596 304 94 25 5
03-19 30° 45° 612 309 94 25 5
03-20 26° 36° 621 309 94 25 5
03-21 18° 35° 625 309 94 25 5
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 25° 30° 631 309 94 25 5
03-23 25° 34° 639 309 94 25 5
03-24 21° 39° 646 309 94 25 5
03-25 31° 62° 671 324 99 25 5
03-26 43° 58° 700 342 108 26 5
03-27 29° 42° 713 346 108 26 5
03-28 26° 46° 727 350 108 26 5
03-29 26° 51° 744 357 108 26 5
03-30 34° 43° 761 363 108 26 5
03-31 36° 45° 779 372 108 26 5
04-01 37° 55° 803 386 111 26 5
04-02 38° 47° 824 396 112 26 5
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 36° 47° 843 406 112 26 5
04-04 33° 47° 861 414 112 26 5
04-05 34° 46° 879 422 112 26 5
04-06 36° 56° 903 436 116 26 5
04-07 32° 57° 926 449 119 26 5
04-08 46° 72° 963 476 136 35 10
04-09 47° 74° 1001 504 154 45 15
04-10 40° 65° 1032 525 165 48 15
04-11 45° 53° 1059 542 172 48 15
04-12 44° 51° 1085 557 177 48 15
04-13 40° 60° 1113 575 185 48 15
04-14 46° 78° 1153 605 205 60 22
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 45° 63° 1185 628 218 64 22
04-16 45° 65° 1218 650 230 69 22
04-17 52° 71° 1257 680 250 80 28
04-18 50° 64° 1292 705 265 87 31
04-19 42° 56° 1319 722 272 87 31
04-20 36° 45° 1338 730 272 87 31
04-21 34° 45° 1355 738 272 87 31
04-22 33° 63° 1381 753 278 87 31
04-23 48° 56° 1411 773 288 89 31
04-24 33° 48° 1429 782 288 89 31
04-25 26° 54° 1447 790 288 89 31
04-26 34° 62° 1473 806 294 89 31
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 50° 80° 1516 839 317 104 41
04-28 61° 77° 1563 876 344 123 55
04-29 62° 78° 1611 914 371 143 69
04-30 53° 70° 1651 943 391 154 76
05-01 47° 79° 1692 975 412 168 84
05-02 47° 72° 1729 1002 430 177 89
05-03 56° 70° 1771 1033 451 190 97
05-04 54° 72° 1812 1064 472 203 105
05-05 58° 65° 1851 1094 491 215 111
05-06 47° 67° 1886 1119 506 222 113
05-07 44° 68° 1920 1143 520 228 114
05-08 52° 75° 1962 1174 542 241 123
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 50° 57° 1993 1196 553 245 123
05-10 43° 63° 2024 1217 564 248 123
05-11 49° 56° 2055 1237 575 250 123
05-12 41° 70° 2088 1261 589 256 124
05-13 57° 80° 2135 1298 615 275 137
05-14 58° 70° 2177 1330 638 289 147
05-15 51° 73° 2218 1360 658 301 154
05-16 47° 77° 2258 1390 678 313 161
05-17 60° 76° 2304 1426 704 331 174
05-18 60° 80° 2351 1464 732 351 189
05-19 58° 86° 2402 1504 762 373 206
05-20 60° 83° 2451 1544 792 395 223
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 62° 86° 2503 1586 824 419 242
05-22 66° 84° 2557 1629 857 444 262
05-23 54° 78° 2601 1664 881 461 273
05-24 49° 80° 2644 1696 904 475 283
05-25 60° 77° 2690 1733 930 494 296
05-26 51° 78° 2733 1765 953 509 306
05-27 58° 64° 2772 1795 972 520 312
05-28 55° 68° 2812 1825 992 532 319
05-29 52° 66° 2849 1852 1009 541 323
05-30 43° 69° 2883 1876 1024 547 325
05-31 45° 77° 2922 1905 1042 558 330
06-01 51° 77° 2964 1937 1064 572 339
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 61° 70° 3008 1970 1088 587 350
06-03 52° 78° 3050 2003 1111 602 360
06-04 59° 84° 3100 2043 1140 624 376
06-05 68° 81° 3153 2085 1173 649 396
06-06 59° 76° 3198 2121 1198 666 408
06-07 57° 68° 3238 2151 1218 678 415
06-08 50° 75° 3278 2181 1238 690 422
06-09 53° 73° 3319 2212 1259 703 430
06-10 51° 68° 3357 2239 1277 712 435
06-11 44° 72° 3393 2266 1293 721 438
06-12 58° 84° 3442 2305 1322 742 454
06-13 67° 89° 3498 2351 1358 770 477
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 64° 80° 3548 2391 1388 792 494
06-15 51° 78° 3590 2423 1411 806 504
06-16 56° 86° 3639 2462 1440 827 520
06-17 68° 90° 3697 2510 1477 857 544
06-18 73° 87° 3755 2558 1515 887 569
06-19 74° 89° 3815 2607 1555 918 596
06-20 71° 88° 3872 2655 1592 948 620
06-21 67° 86° 3927 2699 1627 974 642
06-22 70° 88° 3983 2746 1664 1003 666
06-23 67° 79° 4035 2787 1695 1026 684
06-24 62° 78° 4083 2826 1723 1047 699
06-25 67° 81° 4135 2868 1755 1071 718
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 67° 79° 4186 2909 1787 1094 737
06-27 59° 71° 4229 2942 1810 1109 747
06-28 56° 71° 4271 2973 1831 1123 755
06-29 66° 86° 4325 3018 1865 1149 776
06-30 58° 79° 4369 3051 1889 1164 787
07-01 48° 74° 4408 3080 1908 1175 793
07-02 53° 77° 4451 3114 1931 1191 803
07-03 68° 83° 4504 3157 1964 1216 823
07-04 62° 80° 4553 3196 1993 1237 839
07-05 64° 78° 4602 3235 2023 1258 856
07-06 63° 77° 4650 3273 2051 1278 871
07-07 56° 81° 4697 3309 2077 1297 884
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 66° 86° 4751 3354 2111 1323 905
07-09 68° 80° 4803 3396 2143 1347 924
07-10 61° 71° 4847 3430 2168 1363 936
07-11 62° 80° 4896 3469 2197 1384 952
07-12 66° 81° 4948 3511 2228 1408 970
07-13 64° 84° 5000 3553 2260 1432 989
07-14 70° 83° 5054 3597 2295 1458 1011
07-15 69° 84° 5109 3642 2329 1485 1032
07-16 68° 84° 5163 3686 2363 1511 1053
07-17 66° 79° 5213 3726 2393 1533 1070
07-18 56° 72° 5255 3758 2416 1547 1080
07-19 53° 77° 5298 3791 2438 1562 1089
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 56° 77° 5343 3826 2463 1579 1101
07-21 60° 81° 5392 3864 2492 1599 1117
07-22 64° 79° 5441 3904 2522 1621 1134
07-23 62° 82° 5492 3944 2552 1643 1151
07-24 65° 75° 5539 3982 2580 1663 1166
07-25 60° 76° 5585 4018 2606 1681 1179
07-26 56° 78° 5630 4053 2631 1698 1191
07-27 54° 83° 5677 4089 2657 1716 1204
07-28 59° 87° 5728 4130 2688 1739 1222
07-29 72° 82° 5782 4175 2723 1766 1244
07-30 69° 83° 5836 4219 2756 1792 1264
07-31 66° 88° 5891 4264 2791 1819 1286
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 67° 87° 5946 4309 2826 1846 1308
08-02 71° 82° 6001 4353 2861 1872 1330
08-03 66° 85° 6054 4397 2895 1898 1351
08-04 62° 87° 6107 4440 2927 1923 1370
08-05 68° 81° 6160 4482 2960 1948 1390
08-06 60° 72° 6204 4517 2984 1964 1401
08-07 58° 77° 6249 4552 3010 1981 1414
08-08 59° 80° 6297 4589 3037 2001 1428
08-09 61° 76° 6343 4626 3064 2019 1442
08-10 54° 72° 6384 4657 3084 2032 1449
08-11 55° 74° 6427 4689 3107 2046 1459
08-12 52° 78° 6470 4723 3130 2062 1469
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 56° 81° 6516 4759 3157 2080 1483
08-14 57° 82° 6564 4797 3184 2100 1497
08-15 59° 79° 6611 4834 3211 2119 1511
08-16 65° 79° 6661 4874 3241 2141 1528
08-17 66° 77° 6710 4913 3270 2162 1544
08-18 66° 75° 6758 4951 3299 2182 1560
08-19 54° 69° 6798 4981 3318 2194 1566
08-20 51° 69° 6836 5009 3336 2204 1571
08-21 46° 72° 6873 5036 3353 2213 1575
08-22 47° 76° 6912 5065 3373 2224 1582
08-23 51° 78° 6955 5098 3395 2239 1591
08-24 56° 83° 7002 5135 3423 2258 1606
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 64° 89° 7057 5180 3457 2285 1627
08-26 66° 91° 7114 5226 3494 2313 1651
08-27 69° 94° 7173 5276 3533 2345 1677
08-28 69° 82° 7227 5319 3567 2371 1698
08-29 66° 79° 7277 5360 3598 2393 1716
08-30 67° 89° 7333 5406 3633 2421 1738
08-31 67° 81° 7385 5448 3665 2445 1757
09-01 61° 76° 7431 5484 3691 2463 1770
09-02 48° 69° 7468 5511 3708 2472 1774
09-03 45° 74° 7505 5538 3726 2481 1779
09-04 49° 78° 7547 5569 3747 2494 1787
09-05 53° 82° 7592 5605 3773 2512 1800
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 56° 68° 7632 5635 3792 2524 1806
09-07 46° 59° 7663 5656 3803 2527 1806
09-08 40° 69° 7695 5678 3816 2531 1806
09-09 53° 77° 7738 5711 3838 2546 1816
09-10 52° 79° 7782 5744 3862 2561 1827
09-11 55° 84° 7829 5782 3889 2581 1841
09-12 58° 84° 7878 5821 3918 2602 1857
09-13 59° 81° 7926 5859 3946 2622 1872
09-14 58° 81° 7974 5896 3974 2641 1887
09-15 59° 84° 8023 5935 4003 2663 1903
09-16 54° 81° 8069 5971 4029 2680 1916
09-17 52° 79° 8112 6005 4052 2696 1926
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 55° 81° 8158 6041 4079 2714 1939
09-19 55° 81° 8204 6077 4105 2732 1953
09-20 59° 83° 8253 6116 4134 2753 1969
09-21 59° 83° 8303 6155 4163 2774 1985
09-22 57° 81° 8350 6192 4190 2793 1999
09-23 57° 66° 8389 6222 4210 2805 2005
09-24 57° 67° 8429 6252 4230 2817 2013
09-25 62° 75° 8476 6289 4256 2836 2026
09-26 56° 71° 8518 6320 4278 2849 2035
09-27 58° 74° 8561 6354 4301 2865 2045
09-28 64° 68° 8605 6387 4325 2881 2056
09-29 65° 70° 8650 6423 4351 2898 2068
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 59° 72° 8694 6457 4374 2914 2079

 

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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