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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MSU Proxy/Primo Seedhead Timer (GDD 32)
forecast for Thu, Dec. 18. 2025

 
  

Cedar Rapids, 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 20° 27° 2 0 0 0 0
02-16 3° 22° 2 0 0 0 0
02-17 -5° 1° 2 0 0 0 0
02-18 -13° 5° 2 0 0 0 0
02-19 -4° 8° 2 0 0 0 0
02-20 -6° 17° 2 0 0 0 0
02-21 -12° 22° 2 0 0 0 0
02-22 7° 32° 2 0 0 0 0
02-23 20° 49° 14 3 0 0 0
02-24 37° 56° 39 17 4 0 0
02-25 31° 55° 60 28 5 0 0
02-26 35° 52° 81 40 7 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 31° 53° 101 49 7 0 0
02-28 31° 58° 123 62 9 0 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 19° 32° 127 62 9 0 0
03-02 13° 42° 132 62 9 0 0
03-03 29° 59° 154 74 11 0 0
03-04 44° 53° 180 90 18 0 0
03-05 27° 44° 194 93 18 0 0
03-06 20° 41° 202 93 18 0 0
03-07 31° 37° 214 95 18 0 0
03-08 24° 48° 228 99 18 0 0
03-09 29° 61° 251 112 21 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 33° 74° 282 133 32 3 0
03-11 38° 54° 306 148 36 3 0
03-12 29° 63° 330 162 40 3 0
03-13 34° 71° 361 182 51 6 0
03-14 54° 80° 406 217 76 23 12
03-15 31° 53° 426 228 76 23 12
03-16 26° 43° 439 230 76 23 12
03-17 24° 70° 464 245 81 23 12
03-18 35° 74° 497 268 94 28 12
03-19 34° 53° 518 280 96 28 12
03-20 28° 42° 532 283 96 28 12
03-21 31° 60° 556 297 100 28 12
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 23° 52° 571 302 100 28 12
03-23 36° 50° 592 313 100 28 12
03-24 30° 52° 611 322 100 28 12
03-25 40° 54° 636 337 106 28 12
03-26 31° 58° 658 350 108 28 12
03-27 42° 63° 689 370 119 30 12
03-28 49° 82° 733 404 142 46 23
03-29 60° 75° 778 439 168 63 35
03-30 37° 60° 804 456 174 63 35
03-31 32° 50° 823 465 174 63 35
04-01 31° 45° 839 471 174 63 35
04-02 43° 70° 874 495 189 70 37
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 37° 53° 897 509 192 70 37
04-04 32° 49° 916 517 192 70 37
04-05 37° 48° 937 528 192 70 37
04-06 24° 55° 954 536 192 70 37
04-07 33° 44° 971 542 192 70 37
04-08 21° 49° 984 545 192 70 37
04-09 39° 59° 1011 562 199 70 37
04-10 34° 59° 1036 577 204 70 37
04-11 40° 57° 1063 594 211 70 37
04-12 32° 65° 1089 611 217 70 37
04-13 50° 74° 1129 641 237 82 44
04-14 46° 61° 1161 662 249 86 44
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 42° 59° 1189 681 258 86 44
04-16 31° 66° 1216 697 264 86 44
04-17 53° 71° 1256 727 284 98 51
04-18 51° 69° 1294 755 302 108 56
04-19 43° 58° 1322 773 310 108 56
04-20 41° 51° 1346 787 314 108 56
04-21 43° 60° 1376 807 324 110 56
04-22 44° 71° 1411 832 339 117 58
04-23 56° 74° 1454 865 362 132 68
04-24 58° 72° 1497 898 385 147 78
04-25 51° 60° 1530 922 398 152 78
04-26 41° 63° 1560 942 409 155 78
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 45° 69° 1595 967 423 161 80
04-28 56° 78° 1641 1002 449 179 92
04-29 45° 73° 1678 1029 466 188 97
04-30 42° 66° 1710 1051 478 192 97
05-01 53° 63° 1746 1077 494 200 99
05-02 46° 56° 1774 1096 503 201 99
05-03 46° 57° 1804 1115 512 202 99
05-04 40° 71° 1838 1139 526 208 100
05-05 45° 69° 1873 1164 541 215 102
05-06 44° 77° 1911 1193 559 225 108
05-07 53° 81° 1957 1228 585 243 120
05-08 49° 72° 1995 1256 603 253 125
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 41° 73° 2030 1282 619 261 128
05-10 51° 83° 2075 1317 644 278 140
05-11 48° 80° 2118 1349 666 292 149
05-12 51° 84° 2163 1385 692 310 162
05-13 60° 82° 2212 1424 721 331 178
05-14 59° 84° 2262 1464 750 352 195
05-15 67° 88° 2318 1509 786 380 217
05-16 56° 79° 2363 1545 812 398 230
05-17 50° 66° 2399 1571 827 405 233
05-18 47° 73° 2437 1599 846 416 238
05-19 48° 64° 2472 1623 860 422 239
05-20 50° 63° 2506 1648 875 429 241
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 49° 55° 2536 1668 884 430 241
05-22 47° 63° 2569 1691 897 435 241
05-23 44° 69° 2604 1715 912 442 242
05-24 51° 68° 2641 1743 929 451 247
05-25 55° 69° 2681 1773 949 463 254
05-26 48° 70° 2718 1800 967 473 258
05-27 56° 72° 2761 1832 989 487 267
05-28 55° 66° 2799 1860 1007 497 273
05-29 54° 70° 2839 1890 1027 509 280
05-30 53° 79° 2883 1925 1051 525 291
05-31 55° 83° 2930 1962 1078 544 305
06-01 53° 78° 2974 1995 1102 560 315
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 55° 88° 3023 2035 1131 581 332
06-03 61° 77° 3070 2072 1158 600 346
06-04 56° 74° 3113 2105 1181 615 356
06-05 55° 79° 3158 2139 1206 632 368
06-06 63° 79° 3207 2178 1235 653 384
06-07 60° 76° 3253 2215 1261 671 397
06-08 57° 77° 3298 2250 1287 689 409
06-09 55° 70° 3339 2280 1307 701 417
06-10 50° 82° 3383 2314 1331 717 428
06-11 62° 94° 3439 2360 1367 745 451
06-12 65° 87° 3493 2404 1401 771 471
06-13 62° 83° 3543 2444 1431 793 489
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 63° 85° 3595 2487 1464 818 508
06-15 69° 79° 3648 2529 1496 842 527
06-16 68° 84° 3701 2573 1530 868 548
06-17 65° 87° 3756 2617 1564 894 569
06-18 68° 74° 3805 2656 1593 915 586
06-19 61° 86° 3856 2698 1624 938 604
06-20 68° 88° 3912 2744 1660 966 627
06-21 77° 94° 3976 2797 1704 1002 658
06-22 76° 93° 4038 2850 1746 1036 687
06-23 73° 93° 4099 2900 1787 1069 715
06-24 72° 82° 4154 2946 1822 1096 737
06-25 73° 88° 4213 2994 1861 1127 762
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 71° 89° 4271 3042 1899 1157 788
06-27 68° 80° 4323 3084 1931 1181 807
06-28 65° 89° 4378 3129 1966 1208 829
06-29 71° 86° 4435 3176 2003 1237 852
06-30 65° 84° 4487 3218 2035 1261 872
07-01 63° 85° 4539 3260 2067 1285 891
07-02 64° 86° 4592 3304 2100 1310 911
07-03 65° 90° 4648 3349 2136 1338 934
07-04 73° 91° 4708 3399 2176 1370 960
07-05 70° 86° 4764 3445 2212 1398 984
07-06 70° 86° 4820 3491 2248 1426 1006
07-07 68° 84° 4874 3535 2282 1452 1028
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 70° 83° 4928 3580 2316 1478 1049
07-09 66° 86° 4982 3623 2350 1504 1070
07-10 69° 85° 5037 3669 2385 1531 1092
07-11 66° 81° 5089 3710 2417 1555 1111
07-12 66° 82° 5140 3752 2449 1579 1129
07-13 59° 81° 5188 3790 2477 1599 1144
07-14 61° 85° 5240 3831 2508 1622 1163
07-15 64° 87° 5293 3875 2542 1648 1183
07-16 71° 81° 5348 3919 2576 1674 1205
07-17 60° 71° 5391 3953 2599 1689 1215
07-18 59° 79° 5438 3989 2626 1708 1229
07-19 67° 85° 5492 4033 2660 1734 1250
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 72° 83° 5547 4079 2695 1761 1272
07-21 67° 80° 5599 4120 2727 1785 1290
07-22 74° 87° 5657 4169 2766 1816 1316
07-23 77° 91° 5720 4221 2808 1850 1346
07-24 71° 82° 5774 4266 2842 1876 1367
07-25 69° 85° 5829 4310 2877 1903 1389
07-26 72° 85° 5885 4357 2914 1932 1412
07-27 70° 89° 5943 4405 2951 1961 1437
07-28 69° 88° 6000 4451 2988 1990 1460
07-29 68° 87° 6055 4497 3023 2017 1483
07-30 67° 77° 6106 4537 3054 2040 1501
07-31 62° 75° 6152 4574 3081 2059 1514
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 55° 76° 6196 4607 3104 2074 1524
08-02 58° 76° 6241 4642 3129 2091 1536
08-03 56° 78° 6285 4677 3154 2108 1548
08-04 59° 79° 6332 4714 3181 2127 1562
08-05 62° 82° 6382 4754 3211 2149 1579
08-06 61° 82° 6432 4793 3240 2170 1596
08-07 69° 85° 6486 4838 3275 2197 1617
08-08 70° 90° 6544 4886 3313 2227 1642
08-09 75° 86° 6603 4934 3351 2257 1668
08-10 71° 81° 6657 4978 3385 2283 1689
08-11 66° 82° 6709 5020 3417 2307 1707
08-12 69° 82° 6762 5064 3450 2332 1728
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 61° 80° 6811 5102 3479 2353 1743
08-14 61° 79° 6859 5140 3507 2373 1758
08-15 66° 89° 6914 5185 3542 2400 1781
08-16 69° 92° 6973 5234 3581 2431 1806
08-17 72° 90° 7032 5283 3620 2462 1833
08-18 71° 88° 7089 5331 3657 2491 1857
08-19 69° 83° 7143 5375 3691 2517 1878
08-20 67° 84° 7197 5418 3725 2543 1899
08-21 62° 79° 7245 5457 3753 2563 1914
08-22 61° 80° 7294 5495 3782 2584 1930
08-23 62° 74° 7340 5531 3808 2602 1942
08-24 52° 72° 7380 5561 3828 2614 1950
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 48° 70° 7417 5589 3845 2623 1954
08-26 47° 73° 7456 5617 3864 2634 1959
08-27 49° 73° 7495 5646 3883 2645 1965
08-28 57° 81° 7542 5683 3910 2664 1980
08-29 59° 80° 7589 5721 3937 2683 1994
08-30 62° 77° 7637 5758 3965 2703 2008
08-31 59° 77° 7683 5794 3991 2721 2022
09-01 56° 77° 7727 5829 4016 2738 2033
09-02 54° 79° 7772 5863 4040 2754 2044
09-03 54° 69° 7811 5893 4059 2765 2051
09-04 42° 68° 7844 5916 4072 2770 2051
09-05 49° 64° 7879 5940 4087 2777 2053
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 41° 65° 7910 5961 4098 2780 2053
09-07 41° 69° 7943 5984 4111 2785 2053
09-08 47° 76° 7982 6014 4130 2796 2059
09-09 52° 78° 8025 6046 4153 2811 2069
09-10 56° 82° 8072 6083 4180 2830 2083
09-11 56° 84° 8120 6121 4208 2850 2098
09-12 59° 89° 8172 6164 4240 2874 2117
09-13 69° 96° 8232 6214 4281 2907 2144
09-14 66° 94° 8290 6262 4318 2936 2169
09-15 68° 89° 8347 6308 4355 2965 2193
09-16 64° 90° 8402 6353 4390 2992 2215
09-17 62° 87° 8455 6396 4423 3017 2234
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 66° 77° 8504 6435 4452 3038 2251
09-19 64° 78° 8553 6475 4481 3059 2267
09-20 59° 74° 8597 6509 4505 3075 2278
09-21 58° 78° 8643 6545 4532 3094 2291
09-22 61° 83° 8693 6585 4561 3115 2308
09-23 59° 77° 8739 6621 4587 3133 2321
09-24 56° 77° 8784 6656 4612 3150 2333
09-25 49° 79° 8826 6687 4634 3164 2342
09-26 52° 88° 8874 6726 4662 3184 2357
09-27 56° 87° 8924 6765 4692 3206 2373
09-28 55° 87° 8973 6804 4721 3227 2389
09-29 56° 89° 9023 6845 4751 3249 2407
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 57° 88° 9074 6885 4782 3272 2425
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 30° 43° 15 5 0 0 0
02-16 13° 30° 15 5 0 0 0
02-17 8° 29° 15 5 0 0 0
02-18 24° 47° 29 9 0 0 0
02-19 19° 55° 44 14 0 0 0
02-20 28° 56° 64 24 0 0 0
02-21 39° 58° 90 40 6 0 0
02-22 35° 64° 118 58 14 0 0
02-23 26° 54° 135 65 14 0 0
02-24 17° 43° 144 65 14 0 0
02-25 28° 65° 168 80 18 0 0
02-26 32° 75° 199 101 30 3 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 23° 71° 224 116 35 3 0
02-28 7° 28° 224 116 35 3 0
02-29 13° 53° 235 117 35 3 0
03-01 28° 52° 253 125 35 3 0
03-02 30° 64° 278 140 40 3 0
03-03 48° 78° 319 171 61 17 8
03-04 38° 53° 343 185 65 17 8
03-05 38° 56° 368 200 70 17 8
03-06 27° 56° 388 210 70 17 8
03-07 37° 52° 410 222 72 17 8
03-08 36° 44° 428 230 72 17 8
03-09 24° 41° 439 231 72 17 8
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 20° 50° 452 234 72 17 8
03-11 34° 74° 484 256 84 20 8
03-12 48° 69° 521 283 101 29 12
03-13 38° 71° 554 306 114 34 12
03-14 45° 57° 583 325 123 35 12
03-15 35° 59° 608 340 128 35 12
03-16 37° 53° 631 352 130 35 12
03-17 24° 38° 639 352 130 35 12
03-18 21° 37° 647 352 130 35 12
03-19 27° 62° 669 365 133 35 12
03-20 27° 46° 683 369 133 35 12
03-21 27° 42° 696 372 133 35 12
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 31° 39° 709 375 133 35 12
03-23 18° 37° 714 375 133 35 12
03-24 31° 47° 731 382 133 35 12
03-25 46° 59° 762 402 143 38 12
03-26 29° 51° 780 410 143 38 12
03-27 26° 41° 791 411 143 38 12
03-28 26° 52° 808 418 143 38 12
03-29 35° 61° 834 435 149 38 12
03-30 38° 61° 862 452 157 38 12
03-31 39° 58° 888 468 163 38 12
04-01 40° 45° 909 479 164 38 12
04-02 33° 40° 924 484 164 38 12
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 33° 43° 940 490 164 38 12
04-04 34° 44° 957 497 164 38 12
04-05 30° 52° 976 507 164 38 12
04-06 29° 55° 996 516 164 38 12
04-07 43° 59° 1025 535 173 39 12
04-08 45° 68° 1060 560 187 45 13
04-09 38° 65° 1089 580 197 47 13
04-10 40° 71° 1123 603 210 52 14
04-11 47° 61° 1155 625 222 56 14
04-12 43° 64° 1187 647 234 60 14
04-13 35° 79° 1222 672 249 67 16
04-14 56° 85° 1270 711 278 88 31
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 45° 71° 1306 737 294 96 34
04-16 56° 72° 1348 769 316 110 43
04-17 53° 61° 1384 794 331 117 46
04-18 46° 50° 1409 810 337 117 46
04-19 33° 55° 1431 822 339 117 46
04-20 31° 44° 1447 827 339 117 46
04-21 29° 50° 1464 835 339 117 46
04-22 36° 65° 1493 853 347 118 46
04-23 49° 68° 1530 880 364 127 50
04-24 37° 61° 1557 897 371 127 50
04-25 42° 64° 1588 918 382 130 50
04-26 49° 61° 1620 941 395 134 50
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 61° 80° 1669 979 424 155 65
04-28 59° 67° 1710 1010 444 168 73
04-29 52° 63° 1745 1035 459 175 75
04-30 40° 76° 1781 1061 475 183 78
05-01 50° 69° 1819 1089 493 193 83
05-02 52° 65° 1855 1115 509 201 86
05-03 43° 72° 1890 1141 525 208 89
05-04 51° 68° 1928 1168 542 218 93
05-05 41° 69° 1961 1191 555 223 93
05-06 51° 76° 2002 1223 577 236 102
05-07 56° 74° 2045 1256 600 251 112
05-08 51° 79° 2089 1289 623 267 122
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 53° 65° 2126 1316 640 276 126
05-10 49° 71° 2164 1344 658 286 131
05-11 46° 75° 2203 1373 677 297 137
05-12 51° 85° 2249 1409 703 315 150
05-13 61° 73° 2294 1444 728 332 162
05-14 56° 67° 2333 1474 748 343 169
05-15 48° 76° 2373 1504 768 355 176
05-16 59° 77° 2419 1540 794 373 189
05-17 50° 81° 2463 1573 817 389 199
05-18 59° 88° 2514 1615 849 412 218
05-19 56° 82° 2561 1651 876 431 232
05-20 62° 80° 2610 1691 905 452 248
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 66° 78° 2661 1731 935 475 265
05-22 55° 75° 2703 1764 958 489 275
05-23 54° 79° 2748 1798 982 506 286
05-24 59° 71° 2790 1831 1005 520 296
05-25 46° 74° 2829 1859 1023 531 301
05-26 58° 68° 2869 1890 1044 543 309
05-27 53° 72° 2910 1920 1064 556 317
05-28 53° 68° 2949 1949 1083 567 322
05-29 48° 73° 2987 1977 1102 577 328
05-30 53° 75° 3029 2009 1123 591 336
05-31 57° 79° 3075 2045 1149 609 350
06-01 61° 69° 3118 2079 1173 624 360
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 55° 76° 3161 2112 1196 639 370
06-03 65° 87° 3215 2156 1230 665 391
06-04 69° 81° 3268 2199 1263 690 411
06-05 58° 82° 3316 2237 1291 710 426
06-06 58° 79° 3363 2273 1318 729 440
06-07 57° 81° 3410 2310 1344 748 454
06-08 63° 73° 3456 2346 1370 766 466
06-09 52° 81° 3500 2381 1395 782 478
06-10 56° 75° 3544 2414 1418 798 488
06-11 51° 84° 3590 2450 1444 816 501
06-12 58° 92° 3643 2493 1477 841 521
06-13 72° 90° 3702 2542 1516 872 547
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 61° 85° 3753 2583 1547 895 565
06-15 66° 84° 3806 2626 1580 920 586
06-16 71° 89° 3864 2674 1619 950 611
06-17 76° 93° 3927 2727 1661 985 640
06-18 75° 91° 3988 2778 1702 1018 668
06-19 68° 80° 4040 2820 1735 1042 688
06-20 67° 83° 4093 2864 1768 1067 708
06-21 71° 90° 4152 2912 1806 1098 733
06-22 75° 88° 4211 2961 1846 1129 760
06-23 67° 84° 4265 3005 1879 1155 780
06-24 68° 89° 4321 3051 1916 1183 804
06-25 75° 93° 4383 3103 1958 1217 833
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 69° 88° 4440 3150 1994 1246 857
06-27 61° 80° 4488 3189 2023 1266 872
06-28 60° 73° 4533 3224 2048 1283 884
06-29 64° 83° 4585 3265 2079 1307 903
06-30 56° 75° 4628 3299 2103 1322 913
07-01 55° 71° 4669 3330 2124 1335 921
07-02 64° 73° 4716 3366 2150 1354 935
07-03 65° 84° 4769 3409 2183 1379 954
07-04 66° 81° 4820 3450 2215 1402 973
07-05 61° 75° 4866 3487 2241 1420 986
07-06 59° 81° 4914 3525 2269 1440 1001
07-07 64° 79° 4964 3564 2298 1462 1017
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 63° 80° 5014 3604 2328 1484 1034
07-09 64° 81° 5064 3644 2359 1506 1052
07-10 65° 82° 5116 3686 2390 1530 1070
07-11 65° 82° 5167 3727 2422 1553 1089
07-12 62° 84° 5218 3769 2453 1576 1107
07-13 71° 89° 5276 3817 2491 1606 1132
07-14 72° 92° 5337 3867 2531 1639 1159
07-15 67° 90° 5393 3914 2568 1667 1183
07-16 67° 81° 5446 3956 2600 1692 1202
07-17 61° 77° 5493 3993 2627 1711 1216
07-18 55° 76° 5536 4027 2651 1726 1227
07-19 57° 77° 5581 4062 2676 1743 1239
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 62° 76° 5629 4099 2703 1763 1253
07-21 61° 79° 5676 4137 2731 1782 1268
07-22 63° 82° 5726 4177 2761 1804 1285
07-23 64° 83° 5778 4218 2793 1828 1304
07-24 64° 78° 5827 4257 2822 1849 1320
07-25 62° 79° 5876 4296 2850 1870 1335
07-26 64° 82° 5927 4337 2881 1893 1353
07-27 65° 85° 5980 4380 2914 1918 1373
07-28 70° 86° 6035 4425 2950 1945 1396
07-29 68° 84° 6089 4469 2984 1971 1417
07-30 69° 81° 6142 4512 3016 1996 1437
07-31 69° 87° 6198 4558 3052 2024 1459
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 70° 84° 6253 4603 3087 2051 1481
08-02 67° 86° 6307 4648 3122 2077 1503
08-03 68° 87° 6363 4693 3157 2105 1525
08-04 67° 90° 6420 4740 3194 2134 1549
08-05 75° 92° 6481 4791 3236 2167 1578
08-06 62° 81° 6531 4831 3265 2189 1594
08-07 57° 79° 6576 4867 3291 2206 1607
08-08 61° 76° 6623 4903 3318 2225 1621
08-09 51° 70° 6662 4932 3336 2236 1626
08-10 50° 74° 6702 4962 3356 2248 1633
08-11 51° 79° 6745 4995 3379 2263 1643
08-12 63° 77° 6793 5033 3407 2283 1658
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 57° 79° 6839 5069 3434 2301 1672
08-14 60° 75° 6885 5105 3459 2319 1684
08-15 68° 82° 6938 5148 3492 2344 1704
08-16 64° 84° 6990 5190 3525 2368 1724
08-17 66° 81° 7041 5232 3556 2391 1742
08-18 63° 82° 7092 5272 3586 2414 1759
08-19 59° 78° 7138 5308 3612 2432 1772
08-20 58° 76° 7183 5343 3637 2449 1784
08-21 56° 75° 7226 5376 3661 2464 1795
08-22 50° 75° 7267 5407 3681 2477 1802
08-23 53° 81° 7312 5442 3706 2494 1814
08-24 61° 87° 7364 5484 3739 2518 1834
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 73° 91° 7424 5534 3778 2550 1860
08-26 75° 96° 7487 5587 3822 2585 1891
08-27 74° 93° 7549 5639 3863 2619 1920
08-28 67° 86° 7604 5684 3898 2646 1941
08-29 71° 90° 7662 5732 3937 2676 1967
08-30 63° 79° 7711 5772 3966 2697 1983
08-31 55° 82° 7758 5808 3992 2716 1996
09-01 60° 75° 7803 5844 4018 2733 2009
09-02 49° 76° 7844 5874 4039 2746 2017
09-03 50° 77° 7886 5906 4060 2760 2025
09-04 49° 79° 7928 5938 4082 2774 2034
09-05 55° 77° 7972 5972 4106 2790 2046
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 53° 71° 8012 6003 4127 2802 2053
09-07 45° 68° 8047 6027 4141 2809 2054
09-08 43° 74° 8084 6054 4158 2818 2058
09-09 48° 80° 8126 6086 4180 2832 2067
09-10 53° 83° 8172 6122 4206 2850 2080
09-11 56° 85° 8220 6161 4235 2870 2096
09-12 56° 85° 8269 6200 4264 2891 2112
09-13 61° 81° 8319 6239 4293 2913 2128
09-14 66° 82° 8371 6281 4325 2937 2147
09-15 64° 87° 8424 6325 4359 2962 2168
09-16 62° 86° 8476 6367 4391 2986 2187
09-17 61° 87° 8528 6408 4423 3010 2206
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 56° 86° 8577 6448 4452 3031 2222
09-19 63° 90° 8632 6492 4486 3058 2243
09-20 64° 91° 8687 6537 4521 3085 2265
09-21 62° 89° 8740 6580 4554 3110 2285
09-22 53° 76° 8783 6613 4577 3125 2295
09-23 47° 72° 8820 6640 4594 3134 2299
09-24 50° 74° 8860 6670 4614 3146 2306
09-25 48° 77° 8900 6701 4635 3158 2314
09-26 50° 80° 8943 6734 4658 3173 2324
09-27 53° 79° 8988 6768 4682 3190 2335
09-28 58° 84° 9037 6807 4711 3211 2351
09-29 56° 83° 9084 6845 4739 3230 2366
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 55° 84° 9132 6882 4766 3250 2380

 

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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