Please Note

The GDD models have only been “ground-truthed” in the Great Lakes region. Use of models outside of this region, including the North East, Great Plains and Transition Zones, should be used with caution. We do not recommend the GDD models we use for the mid/southern transition zone and southern states.

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Crabgrass/Annual Bluegrass Preemergence Timer (GDD 32)
through Sun, Dec. 14. 2025

 
  

Marine On Saint, MN

        

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 15° 22° 0 0 0 0 0
02-16 -1° 14° 0 0 0 0 0
02-17 -15° -2° 0 0 0 0 0
02-18 -19° 4° 0 0 0 0 0
02-19 -14° 8° 0 0 0 0 0
02-20 1° 20° 0 0 0 0 0
02-21 -4° 25° 0 0 0 0 0
02-22 8° 34° 0 0 0 0 0
02-23 31° 42° 15 5 0 0 0
02-24 41° 52° 39 19 4 0 0
02-25 29° 49° 57 27 4 0 0
02-26 36° 53° 79 39 7 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 34° 47° 98 48 7 0 0
02-28 25° 45° 111 51 7 0 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 11° 24° 111 51 7 0 0
03-02 12° 39° 114 51 7 0 0
03-03 29° 47° 130 56 7 0 0
03-04 32° 42° 145 62 7 0 0
03-05 24° 32° 151 62 7 0 0
03-06 12° 39° 154 62 7 0 0
03-07 17° 41° 161 62 7 0 0
03-08 26° 49° 177 67 7 0 0
03-09 31° 58° 199 80 10 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 34° 64° 226 97 17 0 0
03-11 27° 48° 242 102 17 0 0
03-12 31° 54° 263 113 17 0 0
03-13 29° 62° 286 127 21 0 0
03-14 48° 74° 326 156 40 11 6
03-15 29° 55° 346 166 40 11 6
03-16 19° 37° 352 166 40 11 6
03-17 30° 60° 375 179 43 11 6
03-18 32° 47° 392 186 43 11 6
03-19 33° 38° 406 189 43 11 6
03-20 25° 46° 419 193 43 11 6
03-21 31° 49° 437 201 43 11 6
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 15° 40° 443 201 43 11 6
03-23 29° 46° 458 206 43 11 6
03-24 25° 45° 471 209 43 11 6
03-25 24° 52° 487 215 43 11 6
03-26 29° 53° 506 224 43 11 6
03-27 39° 59° 533 241 50 11 6
03-28 41° 58° 560 258 58 11 6
03-29 33° 39° 574 262 58 11 6
03-30 30° 33° 584 262 58 11 6
03-31 22° 42° 595 263 58 11 6
04-01 31° 40° 608 266 58 11 6
04-02 31° 37° 620 268 58 11 6
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 34° 44° 637 275 58 11 6
04-04 27° 51° 654 282 58 11 6
04-05 31° 43° 669 287 58 11 6
04-06 25° 57° 688 296 58 11 6
04-07 26° 41° 699 298 58 11 6
04-08 17° 47° 709 298 58 11 6
04-09 36° 60° 735 313 64 11 6
04-10 39° 48° 757 325 65 11 6
04-11 37° 55° 780 339 69 11 6
04-12 37° 65° 809 358 78 12 6
04-13 51° 65° 845 383 93 20 9
04-14 41° 59° 873 401 101 20 9
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 37° 52° 895 414 104 20 9
04-16 31° 56° 917 425 105 20 9
04-17 46° 68° 952 450 120 27 11
04-18 44° 56° 980 469 129 28 11
04-19 32° 52° 1001 479 129 28 11
04-20 33° 54° 1022 491 131 28 11
04-21 36° 60° 1048 506 137 28 11
04-22 45° 67° 1082 531 151 34 13
04-23 45° 68° 1117 555 165 40 14
04-24 43° 50° 1141 569 170 40 14
04-25 42° 55° 1168 586 176 40 14
04-26 33° 63° 1193 602 182 40 14
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 49° 65° 1229 627 197 47 16
04-28 57° 70° 1270 658 218 61 24
04-29 41° 57° 1297 675 225 61 24
04-30 36° 68° 1327 696 236 63 24
05-01 52° 64° 1363 721 252 71 27
05-02 43° 51° 1388 737 257 71 27
05-03 42° 64° 1420 758 268 74 27
05-04 44° 80° 1459 788 288 86 34
05-05 52° 76° 1501 820 310 100 43
05-06 47° 82° 1544 852 332 114 52
05-07 53° 70° 1583 881 351 125 58
05-08 41° 70° 1616 905 365 131 59
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 43° 82° 1657 935 386 143 67
05-10 50° 73° 1697 965 405 155 74
05-11 55° 88° 1746 1005 435 177 90
05-12 57° 86° 1796 1044 464 198 106
05-13 60° 86° 1846 1085 495 221 124
05-14 62° 82° 1897 1125 525 243 142
05-15 59° 78° 1944 1162 552 262 155
05-16 50° 59° 1976 1184 565 266 155
05-17 45° 52° 2002 1201 571 266 155
05-18 39° 54° 2027 1215 575 266 155
05-19 37° 58° 2053 1231 581 266 155
05-20 42° 48° 2076 1244 584 266 155
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 43° 50° 2100 1259 589 266 155
05-22 39° 65° 2130 1279 599 268 155
05-23 40° 62° 2159 1298 608 269 155
05-24 41° 65° 2190 1319 619 272 155
05-25 40° 69° 2223 1341 631 277 155
05-26 43° 71° 2258 1366 646 284 157
05-27 53° 64° 2294 1393 663 292 161
05-28 52° 60° 2329 1417 677 299 162
05-29 54° 71° 2369 1448 698 311 170
05-30 53° 77° 2412 1481 721 326 180
05-31 53° 77° 2456 1514 744 342 190
06-01 48° 79° 2497 1545 765 355 199
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 62° 90° 2551 1589 799 381 220
06-03 54° 67° 2590 1618 818 392 225
06-04 47° 76° 2629 1647 838 403 232
06-05 49° 78° 2671 1679 859 417 240
06-06 59° 71° 2714 1712 882 432 251
06-07 56° 74° 2757 1745 905 447 261
06-08 57° 70° 2799 1777 927 461 269
06-09 51° 66° 2835 1803 943 469 273
06-10 57° 78° 2880 1839 969 486 285
06-11 60° 73° 2925 1873 994 503 297
06-12 57° 71° 2967 1905 1015 517 305
06-13 52° 59° 3000 1928 1028 522 306
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 53° 62° 3035 1954 1044 529 308
06-15 58° 71° 3078 1986 1066 544 318
06-16 63° 78° 3127 2025 1095 565 333
06-17 60° 78° 3174 2062 1122 584 348
06-18 60° 81° 3222 2101 1151 604 363
06-19 59° 84° 3272 2140 1181 626 380
06-20 68° 83° 3325 2184 1214 651 400
06-21 77° 93° 3389 2237 1257 687 430
06-22 82° 92° 3454 2292 1302 724 462
06-23 70° 87° 3510 2338 1338 752 485
06-24 59° 79° 3557 2375 1365 771 500
06-25 63° 70° 3601 2410 1390 787 511
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 60° 65° 3642 2440 1410 800 519
06-27 57° 70° 3684 2472 1432 814 528
06-28 61° 83° 3734 2512 1462 836 544
06-29 66° 81° 3785 2554 1494 859 563
06-30 63° 80° 3834 2593 1523 880 579
07-01 62° 83° 3885 2633 1553 903 597
07-02 63° 87° 3938 2676 1586 928 617
07-03 66° 88° 3993 2721 1622 955 639
07-04 75° 91° 4054 2772 1662 988 667
07-05 72° 81° 4108 2817 1697 1014 688
07-06 65° 82° 4160 2858 1729 1038 707
07-07 59° 83° 4209 2897 1758 1059 723
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 62° 82° 4259 2938 1788 1081 740
07-09 62° 82° 4309 2977 1818 1103 757
07-10 67° 81° 4361 3019 1849 1127 776
07-11 66° 83° 4413 3062 1882 1151 795
07-12 66° 77° 4463 3101 1911 1173 811
07-13 60° 85° 4513 3142 1942 1195 829
07-14 67° 89° 4569 3188 1978 1223 852
07-15 72° 92° 4630 3238 2018 1256 879
07-16 56° 71° 4671 3269 2039 1269 888
07-17 50° 72° 4710 3298 2058 1280 894
07-18 54° 73° 4752 3330 2080 1294 902
07-19 64° 75° 4799 3368 2108 1313 917
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 56° 79° 4845 3404 2134 1331 930
07-21 63° 78° 4894 3442 2162 1352 945
07-22 72° 87° 4951 3489 2200 1381 970
07-23 71° 79° 5004 3533 2233 1406 990
07-24 68° 82° 5057 3576 2266 1431 1010
07-25 63° 84° 5109 3617 2297 1455 1028
07-26 68° 88° 5164 3663 2333 1482 1051
07-27 71° 89° 5222 3711 2371 1512 1076
07-28 65° 86° 5276 3754 2404 1538 1096
07-29 63° 83° 5327 3795 2436 1561 1115
07-30 66° 79° 5377 3836 2466 1583 1132
07-31 54° 76° 5420 3869 2489 1598 1142
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 54° 76° 5463 3902 2512 1613 1152
08-02 53° 77° 5507 3935 2535 1629 1162
08-03 56° 75° 5550 3969 2559 1644 1173
08-04 63° 75° 5597 4006 2586 1663 1187
08-05 59° 79° 5645 4043 2613 1683 1201
08-06 68° 80° 5696 4085 2645 1706 1220
08-07 66° 85° 5750 4128 2679 1732 1241
08-08 70° 87° 5806 4175 2715 1760 1264
08-09 67° 82° 5859 4217 2747 1785 1284
08-10 65° 82° 5910 4259 2779 1808 1302
08-11 59° 77° 5956 4295 2805 1826 1315
08-12 66° 79° 6007 4336 2836 1849 1333
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 58° 78° 6053 4372 2862 1867 1346
08-14 64° 79° 6103 4411 2891 1889 1362
08-15 67° 83° 6156 4454 2924 1914 1382
08-16 67° 81° 6208 4496 2956 1938 1401
08-17 67° 76° 6257 4536 2986 1959 1418
08-18 64° 75° 6305 4573 3013 1979 1433
08-19 65° 84° 6358 4616 3046 2004 1452
08-20 65° 80° 6408 4656 3077 2026 1470
08-21 63° 81° 6458 4697 3107 2048 1487
08-22 67° 77° 6508 4737 3137 2070 1504
08-23 58° 69° 6550 4768 3158 2084 1512
08-24 54° 63° 6586 4795 3175 2092 1516
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 48° 68° 6622 4821 3191 2100 1519
08-26 51° 73° 6662 4851 3211 2112 1526
08-27 53° 77° 6705 4884 3234 2127 1536
08-28 59° 75° 6750 4919 3259 2144 1548
08-29 57° 72° 6793 4951 3281 2159 1558
08-30 58° 74° 6837 4985 3305 2175 1569
08-31 52° 76° 6879 5017 3328 2189 1578
09-01 54° 77° 6923 5051 3351 2205 1589
09-02 57° 74° 6966 5085 3375 2220 1599
09-03 49° 65° 7001 5110 3390 2227 1601
09-04 43° 57° 7029 5128 3398 2227 1601
09-05 44° 57° 7058 5146 3407 2228 1601
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 42° 57° 7086 5164 3414 2228 1601
09-07 40° 62° 7114 5183 3423 2229 1601
09-08 44° 76° 7152 5211 3441 2239 1606
09-09 62° 68° 7196 5244 3464 2254 1616
09-10 59° 71° 7238 5277 3487 2269 1626
09-11 55° 75° 7281 5310 3510 2284 1636
09-12 60° 80° 7330 5348 3538 2304 1651
09-13 64° 82° 7381 5389 3569 2327 1669
09-14 67° 79° 7432 5430 3600 2350 1687
09-15 70° 78° 7484 5472 3632 2374 1707
09-16 67° 89° 7540 5518 3668 2402 1730
09-17 64° 82° 7591 5559 3699 2425 1748
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 64° 81° 7641 5600 3730 2448 1765
09-19 65° 72° 7688 5636 3756 2466 1779
09-20 63° 71° 7733 5671 3781 2483 1791
09-21 63° 76° 7780 5709 3809 2503 1805
09-22 58° 72° 7823 5742 3832 2518 1815
09-23 58° 73° 7867 5776 3856 2534 1826
09-24 54° 73° 7909 5808 3878 2548 1835
09-25 53° 78° 7953 5841 3901 2563 1846
09-26 54° 74° 7995 5874 3924 2578 1855
09-27 52° 71° 8035 5903 3943 2589 1861
09-28 45° 74° 8072 5931 3961 2599 1866
09-29 51° 83° 8117 5966 3986 2616 1878
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 62° 80° 8166 6005 4015 2637 1894
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 17° 29° 1 0 0 0 0
02-16 6° 17° 1 0 0 0 0
02-17 8° 26° 1 0 0 0 0
02-18 21° 35° 7 0 0 0 0
02-19 17° 38° 12 0 0 0 0
02-20 29° 45° 28 5 0 0 0
02-21 22° 47° 40 8 0 0 0
02-22 27° 51° 57 15 0 0 0
02-23 20° 34° 62 15 0 0 0
02-24 15° 41° 68 15 0 0 0
02-25 30° 48° 85 22 0 0 0
02-26 25° 61° 106 33 1 0 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 14° 51° 117 33 1 0 0
02-28 4° 18° 117 33 1 0 0
02-29 9° 45° 122 33 1 0 0
03-01 35° 57° 146 47 5 0 0
03-02 32° 59° 169 60 8 0 0
03-03 41° 65° 200 81 19 3 0
03-04 28° 40° 212 84 19 3 0
03-05 19° 47° 223 85 19 3 0
03-06 25° 51° 239 91 19 3 0
03-07 32° 46° 256 98 19 3 0
03-08 23° 39° 265 98 19 3 0
03-09 18° 39° 272 98 19 3 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 17° 48° 282 98 19 3 0
03-11 31° 64° 308 113 25 3 0
03-12 40° 66° 339 134 36 6 0
03-13 35° 63° 366 151 42 6 0
03-14 42° 58° 393 169 50 6 0
03-15 28° 50° 411 176 50 6 0
03-16 33° 48° 430 185 50 6 0
03-17 23° 31° 435 185 50 6 0
03-18 21° 36° 441 185 50 6 0
03-19 32° 50° 461 194 50 6 0
03-20 17° 32° 463 194 50 6 0
03-21 19° 31° 466 194 50 6 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 23° 32° 471 194 50 6 0
03-23 9° 30° 471 194 50 6 0
03-24 25° 31° 477 194 50 6 0
03-25 32° 36° 489 197 50 6 0
03-26 21° 34° 495 197 50 6 0
03-27 16° 29° 495 197 50 6 0
03-28 17° 36° 500 197 50 6 0
03-29 20° 43° 509 197 50 6 0
03-30 32° 43° 525 202 50 6 0
03-31 30° 44° 540 207 50 6 0
04-01 31° 44° 556 213 50 6 0
04-02 32° 41° 570 217 50 6 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 33° 48° 589 226 50 6 0
04-04 33° 51° 609 236 50 6 0
04-05 28° 56° 629 246 50 6 0
04-06 32° 58° 652 259 53 6 0
04-07 38° 47° 672 269 53 6 0
04-08 41° 48° 695 282 56 6 0
04-09 41° 59° 723 300 64 6 0
04-10 38° 69° 754 321 75 9 0
04-11 42° 59° 783 340 84 10 0
04-12 41° 58° 811 358 92 10 0
04-13 34° 81° 846 383 107 17 2
04-14 43° 69° 880 407 121 23 3
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 44° 60° 910 427 131 25 3
04-16 45° 52° 936 443 138 25 3
04-17 42° 49° 960 457 141 25 3
04-18 43° 51° 985 472 146 25 3
04-19 33° 39° 999 476 146 25 3
04-20 31° 46° 1016 483 146 25 3
04-21 32° 52° 1035 492 146 25 3
04-22 37° 68° 1066 513 157 28 3
04-23 41° 59° 1094 531 165 28 3
04-24 30° 56° 1115 542 166 28 3
04-25 41° 66° 1147 564 178 32 3
04-26 46° 53° 1175 582 186 32 3
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 48° 57° 1205 602 196 34 3
04-28 43° 51° 1230 617 201 34 3
04-29 42° 50° 1255 632 205 34 3
04-30 43° 67° 1288 655 218 39 3
05-01 50° 63° 1322 679 233 46 5
05-02 48° 54° 1351 698 242 47 5
05-03 44° 70° 1386 723 257 54 7
05-04 47° 59° 1417 744 268 57 7
05-05 38° 68° 1448 765 279 60 7
05-06 45° 71° 1484 791 295 68 10
05-07 55° 70° 1524 821 315 80 17
05-08 44° 74° 1561 848 332 89 21
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 47° 65° 1595 873 346 95 23
05-10 38° 70° 1628 895 359 100 23
05-11 41° 73° 1663 920 374 107 25
05-12 59° 84° 1712 959 403 128 41
05-13 48° 71° 1750 987 420 137 45
05-14 46° 71° 1786 1013 437 146 49
05-15 46° 71° 1823 1040 453 154 52
05-16 56° 68° 1863 1070 474 167 60
05-17 51° 83° 1908 1105 499 184 72
05-18 65° 81° 1959 1146 530 207 90
05-19 47° 71° 1996 1173 546 215 93
05-20 57° 74° 2039 1206 570 231 104
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 62° 70° 2083 1240 594 247 115
05-22 54° 68° 2122 1269 613 258 121
05-23 53° 76° 2165 1302 635 272 130
05-24 52° 73° 2205 1332 656 285 138
05-25 47° 73° 2243 1360 673 294 142
05-26 57° 68° 2283 1390 694 307 150
05-27 47° 61° 2315 1412 706 311 150
05-28 53° 62° 2351 1438 722 319 153
05-29 45° 70° 2387 1464 738 327 155
05-30 52° 76° 2429 1496 760 341 164
05-31 59° 67° 2470 1527 781 354 172
06-01 60° 74° 2515 1562 806 371 185
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 54° 76° 2558 1595 829 386 195
06-03 62° 80° 2608 1635 859 408 211
06-04 64° 85° 2660 1677 891 432 231
06-05 55° 76° 2704 1711 915 448 242
06-06 58° 67° 2744 1742 935 460 249
06-07 55° 75° 2787 1775 958 475 259
06-08 57° 74° 2831 1808 982 491 270
06-09 54° 68° 2870 1837 1001 502 276
06-10 48° 73° 2909 1866 1020 513 281
06-11 55° 80° 2954 1901 1045 530 293
06-12 55° 79° 2999 1936 1070 547 306
06-13 62° 81° 3049 1976 1100 569 322
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 56° 78° 3094 2011 1125 586 334
06-15 61° 70° 3137 2044 1148 601 345
06-16 63° 86° 3190 2087 1180 625 364
06-17 55° 76° 3233 2120 1204 641 375
06-18 65° 83° 3286 2163 1236 665 394
06-19 62° 71° 3330 2197 1261 682 406
06-20 57° 66° 3370 2227 1280 693 412
06-21 64° 70° 3415 2262 1306 711 424
06-22 59° 72° 3458 2295 1329 726 435
06-23 52° 81° 3502 2330 1353 742 446
06-24 62° 83° 3553 2370 1384 765 463
06-25 70° 84° 3608 2415 1418 791 485
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 63° 76° 3655 2452 1446 811 500
06-27 55° 74° 3697 2484 1468 825 509
06-28 64° 75° 3745 2522 1496 845 523
06-29 59° 70° 3787 2554 1518 859 533
06-30 49° 73° 3826 2583 1536 869 538
07-01 54° 75° 3868 2615 1559 884 548
07-02 58° 69° 3910 2647 1581 898 556
07-03 63° 83° 3961 2688 1612 921 574
07-04 61° 69° 4004 2721 1634 935 584
07-05 62° 76° 4050 2757 1661 954 598
07-06 57° 80° 4097 2794 1688 973 611
07-07 65° 79° 4146 2834 1717 994 628
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 63° 78° 4195 2872 1746 1015 644
07-09 61° 82° 4245 2912 1776 1037 660
07-10 65° 82° 4296 2953 1807 1060 679
07-11 62° 84° 4347 2994 1838 1083 697
07-12 65° 86° 4401 3038 1872 1109 717
07-13 70° 81° 4454 3081 1905 1134 738
07-14 67° 87° 4509 3126 1940 1161 760
07-15 66° 83° 4562 3169 1973 1186 779
07-16 62° 78° 4610 3207 2001 1206 794
07-17 57° 72° 4652 3240 2023 1220 804
07-18 55° 76° 4696 3273 2047 1236 815
07-19 57° 79° 4742 3309 2073 1254 828
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 63° 82° 4793 3350 2104 1277 845
07-21 67° 80° 4844 3391 2135 1300 863
07-22 64° 82° 4895 3432 2166 1323 881
07-23 63° 74° 4941 3468 2192 1341 895
07-24 58° 74° 4985 3502 2216 1357 905
07-25 54° 78° 5029 3536 2240 1373 917
07-26 63° 82° 5080 3577 2271 1396 934
07-27 72° 89° 5138 3626 2309 1426 960
07-28 69° 87° 5195 3672 2345 1454 983
07-29 68° 83° 5248 3715 2379 1480 1003
07-30 66° 85° 5301 3758 2412 1505 1024
07-31 68° 88° 5357 3804 2448 1533 1047
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 66° 75° 5406 3843 2477 1554 1062
08-02 63° 89° 5459 3886 2510 1579 1083
08-03 58° 83° 5508 3925 2539 1600 1098
08-04 66° 80° 5559 3966 2570 1623 1116
08-05 58° 70° 5601 3998 2592 1637 1126
08-06 54° 76° 5644 4031 2615 1652 1135
08-07 54° 75° 5686 4063 2637 1666 1145
08-08 59° 67° 5727 4094 2658 1679 1153
08-09 56° 67° 5767 4124 2678 1691 1160
08-10 52° 71° 5806 4153 2697 1702 1166
08-11 51° 76° 5848 4185 2719 1716 1174
08-12 52° 79° 5891 4219 2742 1731 1185
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 56° 81° 5938 4255 2769 1750 1199
08-14 60° 81° 5987 4294 2797 1770 1214
08-15 64° 78° 6036 4333 2827 1792 1230
08-16 65° 76° 6084 4371 2855 1812 1245
08-17 66° 74° 6132 4409 2883 1832 1261
08-18 60° 79° 6180 4447 2911 1852 1275
08-19 55° 78° 6224 4481 2935 1868 1287
08-20 59° 73° 6268 4515 2959 1884 1298
08-21 56° 76° 6312 4549 2983 1900 1309
08-22 58° 70° 6354 4581 3005 1914 1318
08-23 63° 78° 6403 4620 3033 1934 1333
08-24 63° 84° 6454 4661 3065 1958 1352
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 72° 86° 6511 4708 3102 1987 1376
08-26 70° 92° 6570 4757 3141 2018 1401
08-27 67° 73° 6618 4795 3169 2038 1417
08-28 62° 69° 6662 4829 3193 2054 1427
08-29 63° 83° 6713 4870 3224 2077 1446
08-30 58° 77° 6759 4906 3249 2094 1458
08-31 57° 82° 6806 4943 3277 2114 1472
09-01 54° 70° 6846 4973 3297 2126 1480
09-02 50° 73° 6886 5003 3317 2138 1486
09-03 56° 76° 6930 5037 3341 2154 1497
09-04 56° 79° 6975 5072 3366 2171 1510
09-05 61° 73° 7021 5108 3392 2189 1522
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 50° 65° 7056 5133 3407 2196 1525
09-07 42° 66° 7088 5155 3419 2200 1525
09-08 50° 76° 7129 5186 3440 2213 1533
09-09 55° 80° 7175 5222 3466 2231 1546
09-10 62° 79° 7224 5261 3494 2251 1561
09-11 60° 82° 7273 5300 3524 2273 1577
09-12 58° 83° 7321 5338 3552 2293 1593
09-13 59° 81° 7370 5377 3580 2313 1608
09-14 66° 77° 7419 5416 3610 2335 1625
09-15 66° 85° 7473 5460 3644 2361 1645
09-16 66° 86° 7527 5504 3678 2387 1667
09-17 67° 86° 7582 5549 3713 2414 1688
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 66° 84° 7635 5592 3746 2439 1708
09-19 67° 84° 7688 5635 3779 2464 1729
09-20 59° 78° 7735 5672 3806 2483 1742
09-21 58° 77° 7781 5708 3832 2501 1755
09-22 50° 67° 7817 5734 3848 2509 1759
09-23 43° 69° 7851 5758 3862 2515 1760
09-24 50° 71° 7890 5787 3881 2526 1765
09-25 53° 77° 7933 5820 3904 2541 1775
09-26 53° 81° 7978 5855 3929 2558 1787
09-27 53° 81° 8023 5890 3954 2575 1799
09-28 53° 83° 8069 5926 3980 2593 1812
09-29 53° 81° 8114 5961 4005 2610 1825
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 57° 82° 8162 5999 4033 2630 1839

 

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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