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 Thu, Apr. 9. 2026

 

GDD Total: 849 (Base 32) through Thu, Apr. 9, 2026

  

Whitetop, VA

        

Forecast »

“Flashback” to 2025

4/7

4/8

4/9

4/10

4/11

4/12

4/13

4/14

4/15

4/16

4/17

4/18

4/19

Done

651

Over

501

Target

220

Close

121

Under

0

 

Generously Supported By:



Tabular Data

Daily GDD accumulation for various base temperature models in 2025 & 2026

2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 37° 43° 18 8 0 0 0
02-16 32° 55° 39 19 2 0 0
02-17 36° 60° 65 35 7 0 0
02-18 43° 52° 91 51 13 0 0
02-19 49° 54° 120 70 23 2 0
02-20 46° 57° 150 90 32 3 0
02-21 40° 55° 175 105 37 3 0
02-22 15° 41° 181 105 37 3 0
02-23 12° 17° 181 105 37 3 0
02-24 11° 28° 181 105 37 3 0
02-25 28° 48° 197 111 37 3 0
02-26 39° 45° 217 121 37 3 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 36° 54° 240 134 41 3 0
02-28 34° 57° 264 148 44 3 0
03-01 39° 57° 290 164 51 3 0
03-02 34° 41° 305 169 51 3 0
03-03 34° 56° 329 182 54 3 0
03-04 41° 65° 360 203 65 6 0
03-05 46° 68° 395 228 80 13 2
03-06 48° 72° 432 256 97 23 7
03-07 53° 72° 473 286 118 35 14
03-08 50° 54° 503 307 128 37 14
03-09 48° 62° 536 329 141 42 14
03-10 47° 63° 569 352 154 47 14
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 55° 73° 611 385 176 61 23
03-12 26° 56° 629 393 176 61 23
03-13 27° 54° 648 402 176 61 23
03-14 36° 60° 675 418 182 61 23
03-15 45° 55° 702 436 190 61 23
03-16 18° 55° 717 441 190 61 23
03-17 13° 22° 717 441 190 61 23
03-18 15° 38° 721 441 190 61 23
03-19 31° 51° 740 450 190 61 23
03-20 37° 59° 766 466 196 61 23
03-21 53° 66° 804 493 213 71 28
03-22 50° 73° 843 522 233 82 34
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 35° 61° 869 539 239 82 34
03-24 29° 51° 887 547 239 82 34
03-25 34° 61° 913 562 245 82 34
03-26 45° 66° 947 586 259 88 35
03-27 38° 60° 974 603 266 88 35
03-28 26° 45° 987 606 266 88 35
03-29 31° 55° 1008 618 267 88 35
03-30 44° 60° 1039 638 277 90 35
03-31 48° 69° 1076 665 294 99 39
04-01 52° 71° 1115 694 313 110 45
04-02 51° 71° 1154 723 333 122 51
04-03 51° 71° 1193 752 352 132 57
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 51° 70° 1232 781 370 143 63
04-05 41° 57° 1259 798 377 143 63
04-06 31° 53° 1279 808 377 143 63
04-07 37° 52° 1301 821 380 143 63
04-08 34° 53° 1323 832 381 143 63
04-09 34° 64° 1350 849 388 143 63
04-10 41° 66° 1381 871 400 147 63
04-11 46° 68° 1416 895 415 153 64
04-12 48° 72° 1454 923 432 163 69
04-13 55° 66° 1492 952 451 174 75
04-14 51° 73° 1533 982 471 186 82
04-15 54° 78° 1577 1016 495 202 93
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 53° 77° 1620 1049 519 217 103
04-17 52° 75° 1662 1081 540 231 112
04-18 52° 80° 1706 1115 564 247 123
04-19 50° 64° 1741 1140 579 254 125
04-20 32° 59° 1764 1154 583 254 125
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 33° 49° 19 9 0 0 0
02-16 23° 55° 36 16 0 0 0
02-17 15° 27° 36 16 0 0 0
02-18 20° 33° 41 16 0 0 0
02-19 20° 30° 44 16 0 0 0
02-20 7° 19° 44 16 0 0 0
02-21 7° 23° 44 16 0 0 0
02-22 16° 35° 48 16 0 0 0
02-23 21° 40° 57 16 0 0 0
02-24 26° 51° 74 23 0 0 0
02-25 33° 53° 95 34 1 0 0
02-26 36° 59° 121 50 7 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 39° 49° 142 62 9 0 0
02-28 31° 49° 160 70 9 0 0
03-01 24° 49° 175 74 9 0 0
03-02 15° 35° 177 74 9 0 0
03-03 21° 50° 191 78 9 0 0
03-04 32° 52° 211 88 9 0 0
03-05 31° 57° 233 100 11 0 0
03-06 22° 29° 237 100 11 0 0
03-07 22° 45° 248 101 11 0 0
03-08 32° 45° 264 107 11 0 0
03-09 30° 50° 282 116 11 0 0
03-10 34° 55° 305 128 13 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 35° 61° 331 144 20 0 0
03-12 41° 66° 363 166 31 4 0
03-13 44° 62° 394 187 42 7 0
03-14 43° 65° 426 209 54 11 0
03-15 50° 56° 457 230 65 13 0
03-16 47° 61° 489 252 77 17 0
03-17 30° 45° 504 257 77 17 0
03-18 31° 60° 528 271 81 17 0
03-19 43° 72° 564 297 97 25 3
03-20 29° 56° 584 307 97 25 3
03-21 22° 46° 596 309 97 25 3
03-22 34° 54° 618 321 99 25 3
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 32° 59° 642 335 103 25 3
03-24 40° 54° 667 350 108 25 3
03-25 35° 54° 689 363 111 25 3
03-26 33° 44° 706 369 111 25 3
03-27 29° 54° 726 379 111 25 3
03-28 43° 67° 759 402 124 30 3
03-29 49° 68° 796 429 140 39 7
03-30 52° 64° 832 455 157 47 10
03-31 45° 61° 863 476 168 51 10
04-01 33° 57° 886 489 171 51 10
04-02 44° 60° 916 510 181 53 10
04-03 59° 70° 959 542 204 67 19
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 57° 72° 1002 575 227 82 29
04-05 60° 76° 1048 611 253 100 42
04-06 56° 65° 1086 639 271 110 48
04-07 37° 58° 1112 655 277 110 48
04-08 31° 41° 1126 659 277 110 48
04-09 29° 54° 1145 668 277 110 48
04-10 39° 51° 1168 681 280 110 48
04-11 33° 42° 1184 687 280 110 48
04-12 28° 39° 1195 688 280 110 48
04-13 29° 55° 1215 698 280 110 48
04-14 44° 71° 1251 724 295 118 50
04-15 41° 62° 1280 744 305 120 50
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 35° 53° 1303 756 307 120 50
04-17 35° 63° 1329 773 314 120 50
04-18 46° 72° 1367 800 331 129 54
04-19 54° 76° 1410 833 354 144 64
04-20 55° 75° 1453 866 377 159 74
04-21 54° 71° 1493 896 397 171 82
04-22 53° 61° 1528 921 412 178 84
04-23 48° 69° 1564 947 429 186 87
04-24 52° 62° 1599 972 444 194 89
04-25 56° 67° 1639 1002 463 205 95
04-26 49° 64° 1673 1026 478 212 97
04-27 39° 63° 1703 1046 487 213 97
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 46° 70° 1739 1072 503 221 100
04-29 48° 73° 1777 1100 521 231 105
04-30 58° 70° 1819 1132 543 245 115
05-01 55° 72° 1860 1163 565 259 123
05-02 55° 71° 1901 1194 586 272 131
05-03 51° 63° 1936 1219 600 278 133
05-04 44° 57° 1965 1238 609 279 133
05-05 39° 55° 1990 1253 614 279 133
05-06 38° 58° 2016 1269 620 279 133
05-07 42° 65° 2047 1291 632 282 133
05-08 51° 68° 2085 1318 649 292 137
05-09 45° 61° 2116 1339 661 295 137
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 39° 65° 2147 1360 671 297 137
05-11 50° 63° 2181 1384 685 304 138
05-12 54° 59° 2216 1409 700 310 140
05-13 52° 65° 2252 1435 716 319 144
05-14 51° 66° 2288 1461 733 327 147
05-15 54° 75° 2330 1494 755 341 156
05-16 62° 71° 2375 1528 779 357 167
05-17 54° 72° 2416 1559 800 371 175
05-18 53° 71° 2456 1589 820 383 182
05-19 52° 71° 2496 1619 840 394 189
05-20 55° 71° 2537 1650 861 407 197
05-21 56° 68° 2576 1679 881 419 204
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 49° 62° 2610 1703 894 424 204
05-23 43° 55° 2637 1720 901 424 204
05-24 40° 60° 2665 1738 909 424 204
05-25 44° 66° 2698 1761 922 430 204
05-26 48° 56° 2728 1781 932 432 204
05-27 46° 52° 2755 1798 939 432 204
05-28 48° 65° 2789 1823 954 438 206
05-29 56° 66° 2829 1852 973 449 212
05-30 48° 61° 2861 1874 985 454 212
05-31 48° 59° 2893 1896 997 458 212
06-01 48° 62° 2926 1919 1010 463 212
06-02 44° 67° 2960 1943 1024 468 213
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 49° 75° 3000 1973 1044 481 220
06-04 54° 73° 3042 2005 1066 494 229
06-05 59° 70° 3084 2037 1088 509 238
06-06 55° 74° 3127 2070 1111 523 248
06-07 59° 68° 3168 2101 1132 536 256
06-08 60° 72° 3212 2135 1156 552 267
06-09 54° 73° 3253 2166 1178 566 275
06-10 57° 70° 3295 2198 1199 579 284
06-11 52° 73° 3336 2229 1220 592 292
06-12 55° 76° 3379 2262 1244 608 302
06-13 62° 75° 3426 2299 1270 626 316
06-14 61° 77° 3473 2336 1297 645 330
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 60° 69° 3516 2369 1320 660 340
06-16 63° 72° 3561 2404 1345 678 352
06-17 62° 77° 3609 2442 1373 697 367
06-18 61° 71° 3653 2476 1397 714 378
06-19 61° 70° 3697 2510 1421 729 389
06-20 55° 74° 3739 2542 1444 744 398
06-21 58° 76° 3784 2577 1469 761 410
06-22 60° 81° 3833 2616 1497 782 426
06-23 63° 82° 3884 2657 1528 804 444
06-24 65° 85° 3937 2700 1561 830 464
06-25 64° 84° 3989 2742 1593 854 483
06-26 65° 78° 4039 2782 1623 876 500
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 61° 79° 4087 2820 1651 896 515
06-28 60° 79° 4135 2858 1679 915 530
06-29 59° 77° 4181 2894 1705 933 543
06-30 62° 79° 4230 2933 1734 954 559
07-01 65° 75° 4278 2971 1762 974 574
07-02 62° 76° 4324 3008 1789 993 587
07-03 58° 76° 4369 3042 1813 1010 599
07-04 59° 78° 4415 3078 1840 1028 612
07-05 59° 79° 4462 3115 1866 1047 626
07-06 56° 78° 4507 3150 1891 1064 638
07-07 59° 80° 4554 3188 1919 1083 652
07-08 63° 81° 4604 3227 1948 1105 669
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 62° 77° 4651 3265 1976 1124 683
07-10 63° 73° 4697 3300 2002 1142 696
07-11 60° 78° 4745 3338 2029 1161 711
07-12 62° 79° 4793 3376 2057 1182 726
07-13 61° 78° 4841 3414 2085 1202 741
07-14 63° 80° 4890 3454 2115 1223 757
07-15 62° 81° 4940 3493 2144 1245 774
07-16 66° 79° 4991 3534 2175 1267 792
07-17 65° 77° 5040 3573 2204 1289 808
07-18 64° 78° 5089 3612 2233 1310 824
07-19 66° 75° 5138 3651 2262 1331 840
07-20 66° 76° 5187 3690 2292 1352 856
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 66° 74° 5235 3728 2319 1372 871
07-22 62° 78° 5283 3766 2347 1392 886
07-23 63° 77° 5331 3804 2375 1411 901
07-24 58° 81° 5378 3841 2403 1431 915
07-25 62° 83° 5429 3882 2433 1453 933
07-26 65° 84° 5481 3924 2465 1478 952
07-27 66° 77° 5531 3964 2495 1499 969
07-28 64° 78° 5580 4003 2524 1521 985
07-29 63° 80° 5629 4042 2554 1542 1001
07-30 66° 80° 5681 4084 2585 1565 1020
07-31 65° 79° 5731 4124 2615 1587 1037
08-01 63° 75° 5778 4161 2642 1606 1051
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 57° 64° 5816 4189 2661 1617 1056
08-03 56° 61° 5853 4216 2677 1626 1060
08-04 55° 67° 5892 4245 2696 1637 1066
08-05 56° 64° 5930 4273 2715 1647 1071
08-06 57° 69° 5971 4304 2735 1660 1079
08-07 57° 69° 6012 4335 2756 1673 1087
08-08 58° 70° 6054 4367 2778 1687 1096
08-09 56° 73° 6097 4400 2801 1701 1106
08-10 55° 75° 6140 4433 2824 1716 1116
08-11 61° 71° 6184 4467 2848 1733 1127
08-12 62° 75° 6231 4504 2875 1751 1141
08-13 64° 71° 6276 4539 2901 1769 1153
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 63° 77° 6325 4578 2929 1789 1169
08-15 60° 77° 6371 4614 2956 1808 1182
08-16 60° 80° 6419 4652 2983 1828 1197
08-17 60° 80° 6467 4690 3011 1848 1212
08-18 62° 78° 6515 4728 3039 1868 1227
08-19 61° 80° 6564 4767 3068 1889 1243
08-20 61° 77° 6611 4804 3095 1908 1257
08-21 61° 75° 6657 4840 3121 1926 1270
08-22 61° 75° 6703 4876 3147 1944 1283
08-23 61° 70° 6746 4909 3171 1959 1293
08-24 61° 74° 6791 4945 3196 1976 1305
08-25 53° 66° 6829 4972 3213 1986 1310
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 46° 64° 6862 4995 3226 1991 1310
08-27 43° 64° 6894 5017 3238 1994 1310
08-28 48° 67° 6929 5043 3254 2002 1313
08-29 48° 69° 6966 5069 3270 2011 1316
08-30 51° 72° 7005 5098 3290 2022 1323
08-31 53° 68° 7043 5127 3308 2032 1328
09-01 50° 68° 7081 5154 3325 2041 1332
09-02 47° 69° 7116 5180 3341 2049 1335
09-03 53° 65° 7153 5206 3357 2058 1338
09-04 52° 65° 7190 5233 3374 2066 1342
09-05 53° 74° 7231 5264 3396 2080 1351
09-06 58° 70° 7273 5296 3418 2094 1360
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 48° 63° 7307 5320 3431 2100 1360
09-08 42° 65° 7338 5341 3443 2103 1360
09-09 42° 66° 7370 5363 3455 2107 1360
09-10 43° 68° 7404 5387 3468 2113 1361
09-11 48° 70° 7441 5414 3485 2121 1365
09-12 50° 73° 7480 5443 3504 2133 1371
09-13 50° 73° 7520 5473 3524 2144 1377
09-14 52° 73° 7560 5503 3545 2157 1385
09-15 54° 70° 7600 5534 3565 2169 1392
09-16 54° 67° 7639 5562 3583 2179 1398
09-17 50° 69° 7677 5590 3601 2189 1402
09-18 52° 74° 7718 5621 3622 2202 1411
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 55° 76° 7761 5654 3646 2218 1421
09-20 55° 77° 7806 5689 3670 2234 1433
09-21 55° 73° 7848 5721 3692 2249 1442
09-22 57° 72° 7891 5754 3715 2263 1452
09-23 56° 71° 7932 5785 3736 2277 1460
09-24 58° 69° 7974 5817 3758 2291 1469
09-25 59° 69° 8016 5849 3780 2305 1478
09-26 58° 70° 8058 5882 3803 2319 1487
09-27 56° 70° 8099 5912 3824 2332 1495
09-28 51° 70° 8138 5941 3842 2342 1500
09-29 51° 68° 8175 5968 3859 2352 1505
09-30 57° 63° 8213 5996 3877 2362 1510
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55

 

Latest Updates

February 16th, 2026Welcome to the 2026 GDD Tracking Season

Although Punxsutawney Phil saw his shadow predicting six more weeks of winter, GDDTracker will start 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. As spring turns to summer, 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 2026!


 

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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