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)
through Wed, Dec. 10. 2025

 
  

Valencia, PA

        

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 27° 38° 10 0 0 0 0
02-16 24° 39° 20 0 0 0 0
02-17 13° 24° 20 0 0 0 0
02-18 6° 15° 20 0 0 0 0
02-19 6° 20° 20 0 0 0 0
02-20 10° 20° 20 0 0 0 0
02-21 17° 24° 20 0 0 0 0
02-22 19° 35° 25 0 0 0 0
02-23 21° 37° 33 0 0 0 0
02-24 30° 50° 50 8 0 0 0
02-25 35° 48° 70 18 0 0 0
02-26 31° 46° 86 24 0 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 34° 47° 105 33 0 0 0
02-28 33° 48° 123 41 0 0 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 15° 48° 133 41 0 0 0
03-02 13° 27° 133 41 0 0 0
03-03 18° 39° 139 41 0 0 0
03-04 35° 65° 167 59 8 0 0
03-05 39° 61° 195 77 16 0 0
03-06 30° 38° 207 79 16 0 0
03-07 28° 45° 221 83 16 0 0
03-08 26° 36° 230 83 16 0 0
03-09 26° 52° 247 90 16 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 35° 63° 274 107 23 0 0
03-11 39° 70° 307 130 36 5 0
03-12 36° 64° 335 148 44 5 0
03-13 34° 69° 365 167 53 6 0
03-14 38° 77° 400 193 69 14 3
03-15 52° 66° 437 220 86 23 7
03-16 50° 68° 474 247 103 32 11
03-17 31° 46° 491 254 103 32 11
03-18 29° 66° 516 269 108 32 11
03-19 44° 76° 554 297 127 42 16
03-20 34° 64° 581 314 134 42 16
03-21 30° 50° 600 322 134 42 16
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 30° 48° 617 329 134 42 16
03-23 23° 43° 628 330 134 42 16
03-24 41° 53° 653 345 139 42 16
03-25 30° 50° 670 353 139 42 16
03-26 29° 41° 683 356 139 42 16
03-27 24° 55° 701 364 139 42 16
03-28 44° 58° 730 383 148 44 16
03-29 56° 72° 773 416 170 58 26
03-30 59° 66° 814 446 191 71 33
03-31 40° 63° 843 466 200 72 33
04-01 33° 46° 860 473 200 72 33
04-02 34° 56° 883 486 204 72 33
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 54° 71° 924 516 224 85 41
04-04 50° 59° 956 539 237 89 41
04-05 52° 69° 995 568 256 100 47
04-06 38° 50° 1017 580 258 100 47
04-07 32° 53° 1038 590 258 100 47
04-08 27° 35° 1047 590 258 100 47
04-09 25° 48° 1061 595 258 100 47
04-10 38° 48° 1082 605 259 100 47
04-11 37° 46° 1102 615 259 100 47
04-12 37° 45° 1121 624 259 100 47
04-13 30° 60° 1144 637 262 100 47
04-14 47° 74° 1182 666 280 111 52
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 39° 64° 1212 685 290 112 52
04-16 36° 46° 1231 695 290 112 52
04-17 29° 60° 1253 707 292 112 52
04-18 46° 82° 1295 739 314 126 61
04-19 65° 81° 1346 780 345 149 79
04-20 48° 66° 1381 805 360 157 81
04-21 57° 78° 1427 840 386 174 94
04-22 50° 68° 1464 867 403 183 98
04-23 44° 77° 1502 895 421 193 103
04-24 50° 82° 1546 930 445 209 114
04-25 62° 71° 1591 964 470 226 126
04-26 44° 63° 1622 986 481 229 126
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 36° 62° 1650 1003 489 229 126
04-28 37° 75° 1683 1027 502 235 126
04-29 57° 83° 1732 1065 531 255 142
04-30 45° 66° 1765 1088 544 261 142
05-01 50° 81° 1809 1122 568 276 152
05-02 60° 74° 1854 1157 593 293 165
05-03 57° 64° 1893 1186 612 304 171
05-04 57° 67° 1933 1216 632 317 178
05-05 52° 70° 1972 1246 651 328 184
05-06 52° 59° 2006 1269 665 334 185
05-07 50° 69° 2043 1297 682 343 189
05-08 50° 67° 2080 1323 699 351 192
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 43° 59° 2109 1342 708 352 192
05-10 39° 74° 2143 1367 722 359 194
05-11 48° 77° 2183 1397 742 371 201
05-12 53° 79° 2227 1431 766 387 212
05-13 62° 67° 2270 1463 789 402 222
05-14 61° 73° 2315 1498 814 419 234
05-15 56° 81° 2361 1535 840 437 247
05-16 68° 80° 2413 1577 872 461 266
05-17 59° 72° 2457 1611 896 477 277
05-18 54° 66° 2495 1639 914 487 282
05-19 49° 63° 2529 1663 928 493 283
05-20 43° 66° 2561 1685 940 497 283
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 54° 66° 2599 1713 958 507 288
05-22 50° 57° 2631 1734 970 510 288
05-23 47° 55° 2659 1753 978 511 288
05-24 46° 61° 2691 1774 990 515 288
05-25 41° 62° 2720 1794 999 516 288
05-26 40° 68° 2752 1816 1011 520 288
05-27 50° 66° 2789 1842 1028 528 291
05-28 51° 57° 2821 1864 1040 532 291
05-29 56° 71° 2862 1895 1061 546 299
05-30 52° 66° 2899 1922 1078 555 303
05-31 44° 55° 2927 1940 1086 555 303
06-01 39° 62° 2955 1959 1094 555 303
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 39° 72° 2989 1982 1108 561 304
06-03 48° 81° 3031 2015 1130 575 313
06-04 58° 85° 3080 2054 1159 596 330
06-05 62° 83° 3131 2095 1190 619 347
06-06 64° 76° 3179 2133 1218 639 362
06-07 64° 77° 3227 2171 1246 659 377
06-08 61° 67° 3269 2203 1268 673 386
06-09 59° 76° 3315 2238 1294 691 399
06-10 61° 73° 3360 2273 1319 708 411
06-11 55° 79° 3405 2308 1344 725 423
06-12 61° 84° 3455 2349 1374 747 440
06-13 65° 83° 3507 2391 1406 771 459
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 67° 76° 3557 2430 1436 793 476
06-15 67° 74° 3605 2469 1464 813 491
06-16 63° 75° 3652 2505 1491 832 505
06-17 65° 78° 3701 2545 1520 853 521
06-18 69° 82° 3755 2588 1554 879 542
06-19 61° 77° 3802 2625 1581 898 556
06-20 59° 79° 3849 2662 1608 917 570
06-21 64° 86° 3902 2705 1641 942 590
06-22 69° 91° 3960 2753 1679 972 615
06-23 72° 91° 4020 2803 1719 1004 642
06-24 72° 92° 4079 2853 1758 1035 668
06-25 73° 89° 4138 2902 1797 1066 694
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 70° 88° 4195 2949 1834 1095 718
06-27 71° 86° 4252 2995 1871 1124 742
06-28 70° 81° 4305 3038 1904 1149 762
06-29 69° 83° 4359 3082 1938 1175 783
06-30 70° 84° 4414 3128 1973 1202 805
07-01 70° 79° 4466 3170 2005 1226 824
07-02 64° 83° 4518 3211 2037 1250 843
07-03 63° 83° 4569 3252 2068 1273 861
07-04 59° 82° 4617 3291 2096 1293 876
07-05 63° 87° 4670 3334 2129 1318 897
07-06 67° 88° 4726 3379 2165 1346 919
07-07 69° 88° 4783 3426 2202 1375 943
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 69° 81° 4836 3470 2235 1400 963
07-09 64° 78° 4885 3509 2264 1421 979
07-10 65° 82° 4937 3551 2296 1445 998
07-11 67° 85° 4991 3595 2330 1471 1019
07-12 70° 89° 5049 3642 2368 1501 1044
07-13 70° 84° 5104 3687 2403 1528 1066
07-14 69° 83° 5158 3731 2437 1554 1087
07-15 68° 87° 5213 3777 2472 1581 1110
07-16 70° 82° 5268 3821 2507 1608 1131
07-17 70° 83° 5323 3866 2542 1635 1153
07-18 67° 76° 5372 3906 2571 1656 1169
07-19 69° 83° 5426 3950 2605 1682 1191
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 71° 81° 5480 3994 2639 1708 1212
07-21 61° 78° 5528 4032 2667 1728 1226
07-22 56° 79° 5573 4067 2692 1745 1238
07-23 58° 85° 5623 4107 2722 1767 1255
07-24 70° 88° 5680 4154 2759 1796 1279
07-25 75° 88° 5739 4203 2798 1827 1306
07-26 71° 88° 5797 4250 2836 1857 1330
07-27 70° 86° 5853 4296 2872 1885 1353
07-28 68° 88° 5909 4342 2908 1913 1376
07-29 71° 90° 5968 4391 2947 1944 1402
07-30 70° 89° 6025 4439 2984 1973 1426
07-31 63° 78° 6074 4477 3013 1994 1442
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 57° 76° 6118 4512 3037 2010 1453
08-02 56° 75° 6161 4545 3060 2025 1463
08-03 52° 78° 6204 4578 3083 2040 1473
08-04 54° 80° 6250 4613 3109 2058 1486
08-05 60° 81° 6298 4651 3137 2078 1501
08-06 65° 80° 6348 4692 3167 2100 1519
08-07 61° 80° 6397 4730 3196 2121 1534
08-08 62° 82° 6447 4771 3226 2143 1551
08-09 61° 85° 6498 4811 3257 2166 1569
08-10 61° 87° 6550 4853 3289 2190 1588
08-11 63° 88° 6603 4897 3322 2215 1608
08-12 65° 92° 6660 4943 3359 2244 1632
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 70° 84° 6715 4988 3394 2271 1654
08-14 68° 84° 6769 5033 3428 2297 1675
08-15 59° 87° 6820 5073 3459 2320 1693
08-16 64° 88° 6874 5117 3493 2346 1714
08-17 68° 82° 6927 5161 3526 2371 1734
08-18 65° 81° 6978 5202 3557 2394 1752
08-19 62° 85° 7030 5243 3589 2418 1771
08-20 69° 78° 7081 5285 3620 2441 1789
08-21 67° 77° 7131 5325 3650 2463 1806
08-22 64° 82° 7182 5365 3681 2486 1824
08-23 63° 84° 7234 5407 3713 2510 1843
08-24 64° 80° 7284 5448 3743 2532 1860
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 56° 71° 7326 5479 3765 2546 1869
08-26 53° 67° 7364 5507 3783 2556 1874
08-27 48° 72° 7402 5535 3801 2566 1879
08-28 45° 73° 7439 5562 3818 2575 1883
08-29 51° 66° 7475 5589 3834 2583 1886
08-30 43° 70° 7510 5613 3849 2590 1888
08-31 45° 75° 7547 5641 3866 2599 1892
09-01 48° 75° 7587 5670 3886 2611 1899
09-02 53° 77° 7630 5703 3909 2626 1909
09-03 50° 81° 7673 5737 3932 2641 1919
09-04 58° 66° 7713 5767 3952 2653 1926
09-05 57° 78° 7758 5802 3977 2670 1938
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 56° 67° 7798 5831 3997 2682 1945
09-07 50° 65° 7833 5856 4012 2689 1947
09-08 40° 69° 7865 5879 4024 2693 1947
09-09 43° 74° 7902 5905 4041 2702 1951
09-10 47° 75° 7941 5934 4060 2713 1957
09-11 48° 78° 7982 5965 4081 2726 1965
09-12 51° 81° 8026 5999 4105 2742 1976
09-13 51° 80° 8069 6033 4128 2757 1986
09-14 53° 82° 8115 6068 4154 2775 1999
09-15 59° 82° 8163 6107 4182 2795 2014
09-16 56° 81° 8210 6143 4209 2814 2028
09-17 55° 82° 8256 6180 4235 2832 2041
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 53° 83° 8302 6216 4261 2850 2054
09-19 56° 83° 8349 6253 4288 2869 2068
09-20 59° 83° 8398 6292 4317 2890 2084
09-21 62° 83° 8449 6333 4348 2913 2102
09-22 65° 81° 8500 6374 4379 2936 2120
09-23 64° 74° 8547 6411 4406 2955 2134
09-24 64° 71° 8593 6446 4432 2973 2146
09-25 62° 72° 8638 6481 4457 2990 2159
09-26 60° 76° 8683 6517 4482 3007 2171
09-27 56° 76° 8728 6551 4507 3024 2182
09-28 57° 82° 8775 6589 4534 3043 2197
09-29 54° 77° 8819 6622 4558 3059 2207
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 56° 80° 8865 6658 4584 3077 2221
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 19° 51° 13 3 0 0 0
02-16 26° 36° 22 3 0 0 0
02-17 17° 27° 22 3 0 0 0
02-18 14° 35° 24 3 0 0 0
02-19 21° 39° 32 3 0 0 0
02-20 19° 48° 43 4 0 0 0
02-21 27° 57° 63 14 0 0 0
02-22 39° 46° 84 25 1 0 0
02-23 36° 54° 107 38 4 0 0
02-24 25° 35° 115 38 4 0 0
02-25 18° 45° 124 38 4 0 0
02-26 34° 62° 150 54 10 0 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 45° 61° 181 75 21 3 0
02-28 26° 59° 202 86 22 3 0
02-29 21° 35° 208 86 22 3 0
03-01 21° 50° 222 90 22 3 0
03-02 40° 51° 246 103 26 3 0
03-03 44° 62° 277 125 37 6 0
03-04 41° 72° 311 149 51 13 2
03-05 47° 73° 349 177 69 23 6
03-06 49° 60° 382 200 82 27 6
03-07 40° 52° 406 214 86 27 6
03-08 39° 61° 434 232 94 28 6
03-09 40° 52° 458 246 98 28 6
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 32° 40° 472 250 98 28 6
03-11 30° 48° 489 256 98 28 6
03-12 41° 66° 520 278 110 31 6
03-13 45° 69° 555 303 125 38 8
03-14 43° 72° 591 328 140 45 11
03-15 43° 59° 620 348 149 47 11
03-16 33° 58° 644 361 153 47 11
03-17 35° 52° 665 372 154 47 11
03-18 30° 34° 675 372 154 47 11
03-19 26° 42° 687 375 154 47 11
03-20 28° 44° 701 379 154 47 11
03-21 26° 37° 711 379 154 47 11
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 23° 49° 725 383 154 47 11
03-23 30° 42° 739 387 154 47 11
03-24 23° 46° 751 390 154 47 11
03-25 34° 64° 779 407 161 47 11
03-26 43° 49° 802 421 165 47 11
03-27 41° 58° 830 439 173 47 11
03-28 33° 49° 850 448 173 47 11
03-29 33° 50° 869 458 173 47 11
03-30 31° 48° 887 465 173 47 11
03-31 42° 56° 914 482 180 47 11
04-01 46° 60° 945 503 191 50 11
04-02 50° 57° 976 525 203 53 11
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 37° 58° 1002 540 208 53 11
04-04 36° 43° 1020 548 208 53 11
04-05 35° 40° 1035 554 208 53 11
04-06 36° 52° 1057 566 210 53 11
04-07 31° 59° 1080 579 213 53 11
04-08 45° 70° 1116 604 229 61 13
04-09 45° 74° 1153 632 246 70 18
04-10 57° 64° 1192 660 265 81 23
04-11 57° 69° 1232 691 285 94 31
04-12 46° 59° 1263 711 296 96 31
04-13 42° 56° 1290 728 303 96 31
04-14 44° 79° 1329 758 322 107 37
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 54° 65° 1367 786 340 117 42
04-16 44° 70° 1402 810 355 124 44
04-17 58° 76° 1447 845 380 141 56
04-18 56° 67° 1487 875 400 153 63
04-19 51° 65° 1523 901 416 161 66
04-20 40° 55° 1549 917 422 161 66
04-21 35° 43° 1566 924 422 161 66
04-22 30° 59° 1589 937 424 161 66
04-23 41° 64° 1620 958 435 163 66
04-24 41° 54° 1645 973 441 163 66
04-25 40° 54° 1670 988 445 163 66
04-26 38° 68° 1701 1009 456 166 66
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 50° 73° 1740 1038 476 178 72
04-28 59° 81° 1788 1076 504 198 87
04-29 59° 81° 1836 1114 532 218 103
04-30 58° 70° 1878 1147 554 232 112
05-01 49° 79° 1920 1178 576 246 121
05-02 57° 82° 1968 1216 603 265 135
05-03 55° 84° 2015 1253 631 285 149
05-04 54° 64° 2052 1280 648 294 153
05-05 54° 73° 2094 1312 669 307 162
05-06 60° 73° 2139 1347 694 324 174
05-07 56° 77° 2183 1381 718 340 185
05-08 63° 78° 2231 1420 747 361 201
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 52° 61° 2266 1444 762 368 202
05-10 47° 58° 2297 1465 772 370 202
05-11 40° 56° 2323 1481 778 370 202
05-12 47° 61° 2355 1503 790 374 202
05-13 45° 77° 2394 1532 809 385 208
05-14 56° 66° 2433 1561 829 397 214
05-15 60° 74° 2478 1596 854 414 226
05-16 59° 74° 2523 1631 878 430 238
05-17 56° 67° 2562 1661 898 442 245
05-18 62° 78° 2611 1699 926 462 260
05-19 57° 81° 2657 1736 953 481 274
05-20 56° 83° 2705 1773 981 501 288
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 62° 84° 2756 1814 1012 524 307
05-22 63° 81° 2806 1855 1042 546 324
05-23 64° 78° 2856 1894 1071 567 340
05-24 60° 82° 2904 1932 1100 588 356
05-25 58° 80° 2951 1969 1127 607 370
05-26 61° 81° 3000 2008 1156 628 386
05-27 62° 75° 3047 2045 1182 646 399
05-28 57° 69° 3088 2076 1203 659 407
05-29 53° 61° 3123 2101 1218 666 409
05-30 49° 66° 3158 2126 1233 673 411
05-31 42° 72° 3193 2151 1248 680 413
06-01 46° 78° 3233 2181 1268 692 420
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 60° 67° 3274 2213 1290 706 429
06-03 61° 80° 3323 2251 1319 727 444
06-04 58° 86° 3373 2291 1349 749 461
06-05 67° 77° 3423 2331 1379 771 478
06-06 64° 76° 3471 2370 1407 791 494
06-07 59° 69° 3513 2402 1429 805 503
06-08 52° 76° 3555 2434 1451 819 512
06-09 59° 72° 3599 2467 1474 834 522
06-10 52° 62° 3634 2492 1489 841 524
06-11 50° 69° 3671 2519 1506 850 528
06-12 50° 79° 3713 2552 1529 865 538
06-13 55° 84° 3761 2589 1557 885 553
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 65° 78° 3810 2629 1586 906 569
06-15 54° 77° 3854 2662 1609 921 579
06-16 54° 86° 3902 2700 1637 941 594
06-17 65° 90° 3958 2746 1673 969 617
06-18 66° 90° 4013 2792 1709 997 640
06-19 71° 87° 4071 2839 1746 1026 664
06-20 71° 89° 4129 2887 1784 1056 689
06-21 70° 91° 4188 2936 1823 1087 715
06-22 71° 92° 4247 2985 1862 1118 741
06-23 70° 82° 4301 3029 1897 1145 763
06-24 62° 79° 4350 3068 1925 1165 778
06-25 60° 83° 4399 3107 1955 1187 795
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 66° 84° 4452 3150 1987 1211 814
06-27 63° 75° 4499 3187 2014 1230 828
06-28 57° 84° 4547 3226 2043 1251 844
06-29 74° 83° 4604 3272 2080 1280 868
06-30 59° 80° 4652 3310 2108 1300 882
07-01 52° 75° 4693 3341 2129 1313 891
07-02 54° 81° 4739 3377 2154 1330 903
07-03 67° 89° 4795 3423 2190 1358 926
07-04 72° 86° 4852 3470 2227 1387 950
07-05 73° 83° 4907 3516 2263 1415 973
07-06 69° 83° 4962 3560 2297 1441 994
07-07 62° 85° 5013 3601 2329 1465 1013
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 64° 88° 5067 3645 2363 1491 1034
07-09 67° 88° 5122 3691 2398 1518 1056
07-10 67° 89° 5178 3736 2434 1546 1079
07-11 65° 75° 5226 3775 2462 1566 1094
07-12 60° 86° 5277 3816 2493 1589 1112
07-13 65° 90° 5333 3861 2528 1616 1134
07-14 66° 89° 5388 3907 2564 1644 1157
07-15 70° 91° 5447 3955 2602 1674 1182
07-16 72° 90° 5506 4004 2641 1705 1208
07-17 68° 80° 5558 4046 2673 1729 1227
07-18 63° 76° 5606 4084 2701 1749 1242
07-19 54° 79° 5650 4119 2726 1766 1254
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 62° 83° 5701 4159 2756 1788 1271
07-21 59° 80° 5748 4197 2784 1808 1286
07-22 64° 76° 5796 4235 2812 1828 1301
07-23 64° 82° 5847 4276 2843 1851 1319
07-24 65° 84° 5900 4318 2875 1875 1338
07-25 65° 80° 5950 4359 2906 1898 1356
07-26 55° 80° 5996 4394 2932 1916 1369
07-27 58° 85° 6046 4434 2961 1937 1385
07-28 59° 90° 6098 4476 2994 1962 1404
07-29 62° 89° 6152 4520 3027 1987 1425
07-30 69° 78° 6203 4562 3059 2011 1444
07-31 69° 87° 6260 4608 3095 2039 1467
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 71° 89° 6317 4656 3133 2069 1492
08-02 70° 83° 6372 4700 3168 2096 1513
08-03 70° 79° 6424 4743 3200 2120 1533
08-04 68° 84° 6478 4787 3234 2146 1554
08-05 64° 87° 6532 4830 3268 2172 1575
08-06 66° 84° 6585 4873 3301 2197 1594
08-07 65° 75° 6633 4911 3329 2217 1610
08-08 69° 82° 6686 4955 3362 2242 1630
08-09 70° 79° 6739 4997 3394 2266 1649
08-10 61° 74° 6784 5033 3420 2284 1662
08-11 54° 75° 6827 5065 3443 2299 1672
08-12 57° 76° 6872 5100 3467 2315 1683
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 53° 78° 6915 5133 3490 2330 1693
08-14 57° 79° 6961 5169 3516 2348 1706
08-15 56° 82° 7008 5206 3544 2368 1720
08-16 66° 82° 7060 5249 3576 2392 1740
08-17 67° 84° 7114 5292 3609 2417 1760
08-18 66° 77° 7163 5332 3639 2439 1777
08-19 61° 68° 7206 5364 3661 2453 1786
08-20 54° 65° 7243 5391 3679 2463 1790
08-21 47° 68° 7278 5417 3694 2470 1793
08-22 46° 73° 7316 5444 3712 2480 1798
08-23 49° 78° 7358 5476 3733 2493 1806
08-24 53° 83° 7404 5512 3759 2511 1819
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 57° 84° 7452 5550 3788 2532 1835
08-26 66° 85° 7506 5594 3821 2557 1855
08-27 66° 91° 7562 5640 3858 2586 1879
08-28 69° 88° 7619 5687 3895 2615 1903
08-29 69° 87° 7675 5733 3931 2643 1925
08-30 66° 91° 7731 5779 3967 2671 1949
08-31 68° 80° 7783 5822 3999 2695 1968
09-01 67° 84° 7837 5865 4032 2720 1988
09-02 53° 70° 7876 5894 4052 2732 1995
09-03 45° 72° 7913 5921 4068 2740 1998
09-04 48° 76° 7953 5951 4089 2753 2005
09-05 51° 79° 7996 5984 4112 2768 2016
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 54° 84° 8043 6021 4139 2787 2030
09-07 51° 65° 8079 6047 4155 2795 2032
09-08 44° 66° 8112 6071 4168 2800 2033
09-09 47° 72° 8150 6098 4186 2810 2038
09-10 54° 78° 8194 6132 4210 2826 2049
09-11 53° 81° 8239 6167 4235 2843 2061
09-12 56° 81° 8286 6204 4261 2861 2074
09-13 56° 80° 8332 6240 4287 2879 2087
09-14 56° 82° 8379 6277 4314 2898 2101
09-15 58° 82° 8427 6315 4343 2919 2116
09-16 55° 77° 8471 6349 4366 2934 2127
09-17 58° 75° 8515 6384 4391 2951 2139
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 63° 76° 8563 6421 4419 2971 2154
09-19 61° 80° 8612 6460 4447 2991 2169
09-20 57° 82° 8659 6497 4475 3011 2183
09-21 63° 84° 8710 6539 4506 3034 2202
09-22 60° 79° 8758 6576 4533 3053 2216
09-23 65° 77° 8807 6615 4562 3074 2232
09-24 64° 72° 8853 6651 4588 3092 2245
09-25 64° 72° 8899 6687 4614 3110 2258
09-26 65° 74° 8946 6724 4642 3130 2273
09-27 66° 71° 8993 6761 4668 3148 2286
09-28 67° 74° 9042 6800 4697 3169 2302
09-29 63° 68° 9085 6833 4721 3185 2312
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 62° 65° 9127 6865 4742 3198 2321

 

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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