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

 
  

IA

        

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 17° 26° 0 0 0 0 0
02-16 0° 16° 0 0 0 0 0
02-17 -10° 1° 0 0 0 0 0
02-18 -18° 2° 0 0 0 0 0
02-19 -5° 7° 0 0 0 0 0
02-20 -10° 10° 0 0 0 0 0
02-21 -12° 19° 0 0 0 0 0
02-22 9° 35° 0 0 0 0 0
02-23 21° 54° 16 6 0 0 0
02-24 37° 51° 38 18 2 0 0
02-25 31° 56° 59 29 4 0 0
02-26 36° 52° 81 41 6 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 34° 53° 103 53 7 0 0
02-28 31° 56° 124 64 8 0 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 19° 30° 127 64 8 0 0
03-02 15° 46° 135 64 8 0 0
03-03 31° 64° 160 79 14 0 0
03-04 40° 54° 185 94 19 0 0
03-05 26° 35° 194 94 19 0 0
03-06 20° 42° 203 94 19 0 0
03-07 31° 37° 215 97 19 0 0
03-08 26° 47° 229 101 19 0 0
03-09 30° 58° 252 113 21 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 35° 72° 283 134 32 3 0
03-11 34° 54° 304 146 34 3 0
03-12 31° 65° 330 162 40 3 0
03-13 36° 73° 363 185 53 8 0
03-14 51° 79° 406 218 76 23 10
03-15 31° 52° 425 227 76 23 10
03-16 23° 44° 437 228 76 23 10
03-17 31° 76° 468 250 87 26 10
03-18 42° 72° 503 275 102 33 12
03-19 32° 51° 523 285 102 33 12
03-20 27° 45° 537 289 102 33 12
03-21 37° 58° 562 304 107 33 12
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 25° 58° 581 313 107 33 12
03-23 36° 51° 603 324 109 33 12
03-24 29° 50° 620 332 109 33 12
03-25 40° 56° 647 348 115 33 12
03-26 31° 60° 670 362 118 33 12
03-27 40° 70° 703 385 131 39 12
03-28 50° 82° 747 419 155 55 23
03-29 44° 68° 781 443 169 61 24
03-30 33° 51° 801 453 169 61 24
03-31 31° 47° 818 460 169 61 24
04-01 32° 43° 833 465 169 61 24
04-02 43° 67° 866 488 182 66 24
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 37° 49° 887 499 183 66 24
04-04 33° 52° 908 509 184 66 24
04-05 35° 47° 927 518 184 66 24
04-06 24° 57° 945 527 184 66 24
04-07 31° 44° 961 532 184 66 24
04-08 20° 53° 976 537 184 66 24
04-09 36° 64° 1004 556 192 66 24
04-10 40° 60° 1032 573 200 66 24
04-11 43° 56° 1060 591 207 66 24
04-12 35° 71° 1091 612 218 69 24
04-13 52° 77° 1133 645 241 83 34
04-14 45° 63° 1165 667 253 87 34
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 35° 61° 1192 683 259 87 34
04-16 35° 75° 1224 706 272 92 34
04-17 55° 79° 1269 741 297 109 46
04-18 50° 66° 1306 767 314 117 49
04-19 39° 56° 1331 783 319 117 49
04-20 40° 48° 1353 795 321 117 49
04-21 43° 64° 1385 816 333 121 49
04-22 51° 70° 1423 845 351 132 55
04-23 54° 74° 1465 877 373 146 64
04-24 53° 68° 1504 905 392 156 69
04-25 50° 57° 1536 927 403 160 69
04-26 39° 63° 1565 946 413 161 69
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 45° 66° 1598 970 426 167 70
04-28 57° 82° 1646 1007 454 186 84
04-29 45° 68° 1681 1032 469 193 86
04-30 43° 68° 1714 1056 482 199 87
05-01 53° 64° 1751 1082 499 207 90
05-02 44° 57° 1779 1101 507 208 90
05-03 44° 63° 1811 1123 519 211 90
05-04 40° 73° 1846 1148 534 218 92
05-05 46° 73° 1883 1175 551 228 97
05-06 47° 77° 1923 1205 571 240 104
05-07 53° 80° 1968 1240 596 256 116
05-08 52° 74° 2009 1270 617 269 123
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 45° 77° 2048 1299 636 280 129
05-10 52° 86° 2095 1336 662 299 143
05-11 55° 83° 2142 1373 689 318 157
05-12 48° 84° 2186 1407 713 334 168
05-13 57° 83° 2234 1445 742 354 183
05-14 60° 86° 2284 1486 772 377 201
05-15 64° 80° 2335 1526 803 399 218
05-16 51° 74° 2375 1556 823 411 225
05-17 47° 65° 2409 1580 836 417 226
05-18 40° 74° 2444 1605 852 424 228
05-19 51° 64° 2479 1630 867 431 230
05-20 50° 62° 2513 1655 881 437 232
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 48° 55° 2543 1674 891 439 232
05-22 43° 62° 2573 1695 901 441 232
05-23 42° 69° 2607 1718 915 447 232
05-24 52° 67° 2645 1746 932 457 237
05-25 54° 72° 2685 1777 953 470 245
05-26 48° 69° 2722 1803 970 478 248
05-27 56° 62° 2758 1830 986 487 252
05-28 54° 66° 2797 1858 1004 497 257
05-29 51° 68° 2834 1886 1022 507 262
05-30 54° 79° 2879 1920 1047 523 273
05-31 52° 85° 2925 1957 1073 542 287
06-01 56° 81° 2972 1994 1100 560 301
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 59° 88° 3024 2035 1132 584 319
06-03 58° 78° 3070 2071 1158 602 332
06-04 51° 78° 3112 2104 1180 616 342
06-05 55° 79° 3157 2139 1205 633 354
06-06 61° 79° 3205 2177 1233 653 369
06-07 63° 72° 3251 2212 1259 671 381
06-08 60° 71° 3294 2246 1282 686 392
06-09 56° 68° 3334 2276 1302 699 399
06-10 49° 84° 3379 2310 1327 715 410
06-11 60° 92° 3433 2354 1361 741 431
06-12 64° 85° 3485 2397 1393 765 451
06-13 65° 83° 3537 2439 1425 789 470
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 67° 88° 3592 2484 1460 817 492
06-15 67° 82° 3645 2526 1493 841 511
06-16 66° 86° 3699 2571 1527 867 533
06-17 64° 80° 3749 2611 1557 889 550
06-18 64° 78° 3798 2650 1586 910 566
06-19 60° 84° 3848 2690 1616 932 583
06-20 69° 88° 3904 2736 1652 961 606
06-21 79° 94° 3969 2790 1697 997 637
06-22 76° 92° 4031 2843 1739 1031 667
06-23 74° 88° 4090 2892 1778 1063 693
06-24 71° 78° 4143 2934 1811 1087 712
06-25 70° 88° 4200 2981 1847 1116 736
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 68° 87° 4255 3027 1883 1143 759
06-27 63° 82° 4306 3067 1914 1166 776
06-28 68° 89° 4362 3114 1950 1195 800
06-29 71° 82° 4417 3158 1985 1221 821
06-30 67° 84° 4470 3202 2018 1246 842
07-01 63° 84° 4522 3243 2050 1270 860
07-02 63° 84° 4574 3285 2081 1294 879
07-03 67° 91° 4630 3332 2118 1323 903
07-04 73° 89° 4689 3381 2157 1354 929
07-05 70° 83° 4744 3425 2192 1380 950
07-06 68° 85° 4799 3470 2227 1407 972
07-07 65° 84° 4851 3513 2259 1431 992
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 66° 85° 4905 3556 2293 1457 1012
07-09 66° 86° 4959 3600 2327 1483 1033
07-10 69° 85° 5014 3645 2362 1510 1055
07-11 67° 78° 5064 3686 2392 1532 1073
07-12 66° 78° 5114 3725 2422 1554 1089
07-13 58° 80° 5161 3763 2449 1573 1104
07-14 62° 87° 5214 3805 2481 1598 1123
07-15 68° 87° 5269 3850 2517 1625 1145
07-16 70° 79° 5322 3893 2550 1650 1165
07-17 59° 72° 5365 3927 2573 1666 1176
07-18 58° 80° 5412 3964 2600 1685 1190
07-19 68° 87° 5468 4009 2636 1712 1212
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 70° 84° 5523 4054 2670 1739 1234
07-21 71° 81° 5576 4098 2704 1765 1255
07-22 73° 89° 5635 4147 2743 1796 1281
07-23 73° 90° 5695 4196 2783 1827 1307
07-24 69° 82° 5749 4240 2816 1853 1328
07-25 68° 83° 5802 4284 2850 1878 1349
07-26 72° 86° 5859 4331 2887 1908 1373
07-27 71° 90° 5918 4379 2926 1938 1398
07-28 67° 87° 5973 4425 2961 1965 1421
07-29 67° 89° 6029 4471 2997 1993 1444
07-30 67° 80° 6081 4512 3029 2017 1462
07-31 63° 76° 6128 4550 3056 2036 1477
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 56° 74° 6171 4583 3079 2051 1487
08-02 57° 76° 6216 4617 3104 2068 1498
08-03 56° 76° 6260 4651 3127 2084 1509
08-04 61° 77° 6306 4688 3154 2103 1523
08-05 59° 81° 6354 4726 3182 2123 1538
08-06 66° 81° 6405 4767 3213 2146 1556
08-07 69° 83° 6460 4811 3247 2172 1577
08-08 72° 89° 6518 4860 3286 2203 1603
08-09 72° 82° 6573 4905 3321 2230 1625
08-10 70° 81° 6627 4948 3354 2255 1645
08-11 64° 80° 6677 4988 3385 2277 1662
08-12 67° 83° 6730 5032 3418 2302 1683
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 60° 80° 6778 5070 3446 2322 1698
08-14 63° 82° 6829 5110 3477 2345 1715
08-15 67° 87° 6884 5156 3512 2372 1738
08-16 72° 92° 6944 5206 3552 2404 1765
08-17 73° 93° 7005 5256 3593 2437 1792
08-18 70° 85° 7061 5302 3628 2465 1815
08-19 67° 86° 7115 5347 3663 2492 1837
08-20 67° 85° 7169 5391 3697 2518 1858
08-21 65° 81° 7220 5432 3728 2540 1876
08-22 61° 81° 7269 5471 3757 2561 1892
08-23 62° 73° 7314 5506 3782 2579 1904
08-24 53° 72° 7355 5536 3803 2591 1911
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 48° 71° 7392 5564 3820 2601 1916
08-26 46° 74° 7431 5592 3839 2611 1921
08-27 56° 79° 7476 5628 3864 2628 1934
08-28 56° 82° 7523 5664 3891 2647 1947
08-29 59° 83° 7571 5703 3919 2668 1963
08-30 61° 79° 7620 5741 3948 2688 1978
08-31 64° 77° 7668 5780 3976 2709 1994
09-01 58° 77° 7714 5815 4002 2726 2006
09-02 53° 79° 7758 5850 4026 2742 2018
09-03 54° 68° 7797 5879 4045 2754 2024
09-04 44° 71° 7833 5904 4061 2761 2026
09-05 50° 64° 7868 5929 4076 2768 2028
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 42° 64° 7899 5951 4087 2771 2028
09-07 40° 71° 7933 5975 4101 2777 2029
09-08 50° 79° 7975 6007 4123 2792 2039
09-09 57° 76° 8020 6041 4148 2808 2050
09-10 58° 83° 8069 6080 4176 2829 2066
09-11 58° 85° 8118 6120 4206 2851 2082
09-12 63° 85° 8170 6162 4238 2874 2101
09-13 67° 96° 8230 6211 4278 2906 2128
09-14 65° 91° 8286 6257 4314 2934 2151
09-15 70° 90° 8344 6306 4352 2964 2176
09-16 66° 88° 8399 6351 4387 2991 2198
09-17 65° 77° 8448 6390 4416 3013 2215
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 61° 74° 8494 6426 4442 3030 2227
09-19 64° 78° 8543 6465 4471 3052 2244
09-20 57° 75° 8588 6499 4496 3068 2255
09-21 59° 80° 8635 6537 4523 3088 2269
09-22 61° 85° 8686 6578 4554 3111 2288
09-23 60° 75° 8732 6613 4580 3128 2300
09-24 57° 79° 8777 6649 4605 3146 2313
09-25 51° 82° 8822 6683 4630 3162 2324
09-26 54° 87° 8870 6722 4658 3183 2339
09-27 57° 83° 8918 6760 4686 3203 2354
09-28 48° 84° 8962 6794 4710 3219 2366
09-29 59° 87° 9013 6835 4741 3242 2384
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 56° 85° 9062 6873 4770 3262 2399
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 25° 43° 12 2 0 0 0
02-16 10° 26° 12 2 0 0 0
02-17 6° 28° 12 2 0 0 0
02-18 24° 43° 24 4 0 0 0
02-19 21° 57° 40 10 0 0 0
02-20 29° 60° 63 23 2 0 0
02-21 34° 60° 88 38 8 0 0
02-22 35° 64° 115 55 15 0 0
02-23 26° 52° 133 63 15 0 0
02-24 20° 51° 146 66 15 0 0
02-25 31° 65° 172 82 21 0 0
02-26 33° 78° 205 105 34 6 1
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 14° 58° 219 109 34 6 1
02-28 5° 29° 219 109 34 6 1
02-29 18° 57° 235 115 34 6 1
03-01 28° 55° 254 124 34 6 1
03-02 31° 68° 282 142 42 6 1
03-03 44° 78° 322 172 62 17 7
03-04 36° 45° 340 180 62 17 7
03-05 25° 56° 358 188 62 17 7
03-06 29° 57° 379 199 63 17 7
03-07 34° 56° 403 213 66 17 7
03-08 31° 44° 418 218 66 17 7
03-09 22° 46° 430 220 66 17 7
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 18° 56° 446 226 66 17 7
03-11 40° 76° 482 252 82 25 10
03-12 45° 68° 516 276 96 32 12
03-13 38° 72° 549 299 109 37 12
03-14 46° 55° 578 318 118 37 12
03-15 34° 55° 601 331 121 37 12
03-16 38° 50° 623 343 123 37 12
03-17 25° 37° 631 343 123 37 12
03-18 21° 36° 638 343 123 37 12
03-19 27° 64° 661 356 126 37 12
03-20 27° 45° 675 360 126 37 12
03-21 28° 46° 691 366 126 37 12
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 26° 42° 703 368 126 37 12
03-23 15° 31° 704 368 126 37 12
03-24 30° 40° 717 371 126 37 12
03-25 39° 62° 745 389 135 38 12
03-26 28° 50° 762 396 135 38 12
03-27 23° 39° 771 396 135 38 12
03-28 30° 49° 789 404 135 38 12
03-29 36° 66° 817 422 144 39 12
03-30 37° 58° 843 438 150 39 12
03-31 38° 59° 870 455 156 39 12
04-01 41° 46° 892 467 158 39 12
04-02 34° 46° 910 475 158 39 12
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 34° 53° 931 486 159 39 12
04-04 31° 55° 952 497 160 39 12
04-05 29° 56° 972 507 160 39 12
04-06 33° 59° 996 521 164 39 12
04-07 44° 63° 1028 543 176 42 12
04-08 46° 65° 1061 566 189 48 12
04-09 36° 67° 1090 585 199 49 12
04-10 40° 71° 1124 609 212 54 13
04-11 46° 58° 1154 629 222 56 13
04-12 39° 65° 1184 649 232 59 13
04-13 37° 85° 1223 678 251 70 19
04-14 56° 84° 1271 716 279 90 34
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 45° 74° 1309 744 297 99 39
04-16 58° 66° 1349 774 317 111 46
04-17 51° 63° 1384 799 332 119 48
04-18 46° 51° 1411 816 339 119 48
04-19 32° 54° 1432 827 340 119 48
04-20 31° 46° 1449 834 340 119 48
04-21 30° 51° 1467 842 340 119 48
04-22 37° 70° 1499 864 352 122 48
04-23 49° 67° 1535 890 368 130 51
04-24 39° 64° 1565 910 378 132 51
04-25 44° 63° 1596 931 389 136 51
04-26 48° 60° 1628 953 401 139 51
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 57° 71° 1670 985 423 153 60
04-28 57° 68° 1711 1016 444 166 68
04-29 48° 60° 1743 1038 456 170 68
04-30 43° 70° 1778 1063 471 177 69
05-01 48° 65° 1812 1087 485 184 71
05-02 51° 61° 1846 1111 499 190 72
05-03 39° 72° 1880 1135 513 195 72
05-04 48° 57° 1911 1156 524 198 72
05-05 40° 67° 1942 1177 535 201 72
05-06 49° 74° 1981 1206 554 213 79
05-07 55° 75° 2025 1240 578 228 89
05-08 54° 78° 2068 1273 601 244 100
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 50° 65° 2104 1299 617 251 102
05-10 47° 76° 2143 1328 636 262 108
05-11 47° 78° 2184 1359 657 275 116
05-12 55° 85° 2232 1397 685 295 131
05-13 61° 70° 2275 1430 708 310 141
05-14 54° 74° 2317 1462 730 324 150
05-15 51° 76° 2358 1493 751 338 159
05-16 59° 76° 2404 1529 777 355 171
05-17 54° 83° 2450 1565 803 374 185
05-18 63° 89° 2504 1609 837 399 205
05-19 54° 75° 2546 1641 859 414 215
05-20 63° 82° 2597 1682 890 436 232
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 57° 76° 2641 1716 914 453 244
05-22 52° 74° 2682 1747 935 466 252
05-23 55° 78° 2727 1782 960 482 263
05-24 59° 72° 2770 1815 983 498 274
05-25 48° 78° 2811 1846 1004 510 281
05-26 59° 71° 2854 1879 1027 525 291
05-27 52° 73° 2895 1910 1048 538 299
05-28 53° 71° 2934 1939 1067 550 306
05-29 48° 74° 2974 1969 1087 561 312
05-30 54° 78° 3018 2003 1111 577 323
05-31 63° 80° 3068 2043 1141 599 340
06-01 64° 80° 3118 2083 1171 621 357
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 59° 82° 3166 2121 1199 642 373
06-03 69° 89° 3223 2168 1236 671 397
06-04 67° 84° 3277 2212 1270 696 417
06-05 55° 85° 3325 2250 1298 716 432
06-06 59° 82° 3373 2288 1326 737 448
06-07 56° 81° 3420 2325 1353 755 461
06-08 63° 75° 3468 2363 1381 775 476
06-09 54° 80° 3512 2397 1405 792 488
06-10 54° 75° 3555 2430 1428 806 497
06-11 57° 87° 3605 2470 1458 828 514
06-12 62° 88° 3658 2513 1491 853 534
06-13 69° 88° 3714 2559 1527 882 558
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 60° 86° 3765 2600 1558 905 576
06-15 66° 83° 3818 2643 1591 929 595
06-16 67° 90° 3875 2690 1628 958 619
06-17 75° 90° 3935 2740 1668 991 647
06-18 72° 87° 3993 2788 1706 1020 671
06-19 67° 72° 4041 2826 1734 1040 686
06-20 64° 80° 4091 2866 1764 1062 703
06-21 72° 89° 4149 2914 1802 1093 729
06-22 74° 85° 4207 2962 1840 1123 754
06-23 65° 86° 4261 3006 1874 1148 774
06-24 70° 91° 4320 3055 1913 1179 800
06-25 80° 92° 4384 3109 1957 1215 831
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 68° 86° 4439 3154 1992 1242 853
06-27 61° 78° 4486 3191 2019 1262 868
06-28 66° 77° 4536 3231 2049 1283 884
06-29 64° 78° 4584 3269 2077 1304 900
06-30 54° 75° 4627 3302 2100 1318 909
07-01 58° 68° 4668 3333 2121 1331 917
07-02 61° 77° 4715 3370 2148 1350 931
07-03 61° 84° 4766 3411 2179 1373 949
07-04 68° 81° 4818 3453 2211 1397 968
07-05 61° 76° 4865 3490 2238 1416 982
07-06 58° 82° 4913 3528 2266 1436 997
07-07 63° 81° 4963 3568 2296 1458 1014
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 60° 81° 5011 3606 2324 1478 1029
07-09 62° 82° 5061 3646 2354 1501 1047
07-10 65° 79° 5111 3686 2384 1523 1064
07-11 62° 83° 5162 3727 2415 1545 1081
07-12 61° 84° 5212 3767 2445 1568 1099
07-13 70° 90° 5270 3815 2483 1598 1124
07-14 76° 91° 5332 3867 2525 1631 1152
07-15 70° 92° 5391 3916 2564 1662 1178
07-16 67° 79° 5442 3957 2595 1685 1196
07-17 63° 77° 5490 3995 2623 1705 1211
07-18 55° 76° 5534 4029 2647 1721 1222
07-19 57° 79° 5579 4064 2672 1739 1235
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 64° 73° 5626 4101 2699 1757 1248
07-21 61° 82° 5676 4141 2729 1779 1265
07-22 63° 80° 5725 4180 2758 1800 1281
07-23 64° 83° 5777 4222 2790 1824 1300
07-24 67° 82° 5829 4264 2822 1849 1320
07-25 67° 82° 5881 4306 2854 1873 1339
07-26 68° 85° 5936 4351 2889 1900 1361
07-27 71° 87° 5993 4398 2926 1928 1384
07-28 68° 87° 6048 4443 2961 1955 1406
07-29 64° 87° 6102 4487 2995 1981 1427
07-30 68° 85° 6157 4532 3030 2008 1449
07-31 70° 86° 6212 4577 3065 2036 1472
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 69° 84° 6267 4622 3100 2062 1493
08-02 68° 87° 6322 4667 3135 2089 1515
08-03 68° 89° 6379 4714 3172 2118 1539
08-04 70° 91° 6437 4762 3210 2148 1564
08-05 74° 91° 6498 4813 3251 2181 1592
08-06 61° 80° 6546 4851 3279 2201 1607
08-07 56° 79° 6592 4887 3305 2219 1620
08-08 62° 75° 6638 4923 3331 2237 1633
08-09 53° 71° 6678 4953 3351 2250 1641
08-10 50° 75° 6719 4984 3372 2263 1649
08-11 54° 78° 6763 5018 3396 2278 1659
08-12 62° 70° 6807 5052 3420 2295 1671
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 62° 74° 6854 5089 3447 2313 1684
08-14 64° 74° 6901 5126 3474 2332 1698
08-15 69° 85° 6956 5171 3509 2359 1720
08-16 66° 84° 7009 5214 3542 2384 1740
08-17 64° 79° 7058 5253 3571 2406 1757
08-18 61° 83° 7109 5294 3602 2428 1774
08-19 60° 79° 7156 5331 3629 2447 1788
08-20 56° 76° 7200 5365 3653 2463 1799
08-21 62° 77° 7247 5402 3680 2482 1813
08-22 54° 77° 7291 5436 3704 2498 1824
08-23 57° 80° 7337 5472 3730 2516 1837
08-24 63° 86° 7389 5514 3762 2540 1856
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 72° 91° 7449 5564 3802 2572 1883
08-26 75° 96° 7512 5617 3845 2608 1914
08-27 72° 86° 7570 5665 3883 2637 1938
08-28 66° 86° 7624 5709 3917 2663 1959
08-29 69° 91° 7683 5758 3956 2694 1985
08-30 65° 79° 7732 5797 3985 2716 2002
08-31 56° 83° 7779 5834 4012 2735 2016
09-01 59° 75° 7825 5870 4038 2752 2028
09-02 48° 75° 7865 5900 4058 2764 2035
09-03 52° 78° 7907 5932 4080 2778 2044
09-04 51° 81° 7951 5966 4104 2795 2056
09-05 62° 80° 8000 6005 4133 2816 2072
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 52° 71° 8040 6035 4153 2827 2078
09-07 45° 71° 8076 6061 4169 2835 2081
09-08 48° 76° 8116 6091 4189 2847 2088
09-09 50° 82° 8160 6125 4213 2863 2099
09-10 58° 82° 8208 6163 4241 2883 2114
09-11 55° 86° 8257 6202 4270 2904 2130
09-12 57° 85° 8305 6240 4298 2925 2146
09-13 59° 80° 8353 6278 4326 2944 2160
09-14 68° 82° 8406 6321 4359 2969 2180
09-15 63° 88° 8460 6365 4393 2995 2201
09-16 65° 86° 8513 6408 4426 3020 2221
09-17 64° 87° 8567 6452 4460 3046 2242
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 65° 87° 8621 6496 4494 3072 2263
09-19 68° 88° 8676 6541 4529 3100 2286
09-20 59° 90° 8729 6584 4562 3124 2305
09-21 64° 92° 8784 6629 4597 3152 2328
09-22 55° 70° 8825 6660 4618 3164 2335
09-23 45° 71° 8861 6686 4634 3172 2338
09-24 52° 72° 8901 6716 4654 3184 2345
09-25 49° 79° 8943 6748 4676 3198 2354
09-26 49° 82° 8987 6782 4700 3214 2365
09-27 50° 82° 9031 6816 4724 3230 2376
09-28 55° 88° 9080 6855 4753 3252 2393
09-29 55° 86° 9129 6894 4782 3272 2408
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 54° 85° 9176 6931 4809 3291 2422

 

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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