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 Annual Bluegrass Seedhead Embark Timer (GDD 22)
forecast for Tue, Apr. 7. 2026

 

Forecasted GDD Total: 1503 (Base 22) through Tue, Apr. 7, 2026

  

Springfield, VA

        

Forecast »

“Flashback” to 2025

3/27

3/28

3/29

3/30

3/31

4/1

4/2

4/3

4/4

4/5

4/6

4/7

4/8

Done

1450

Over

1050

Target

680

Close

380

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 34° 46° 18 8 0 0 0
02-16 32° 44° 34 14 0 0 0
02-17 32° 49° 53 23 0 0 0
02-18 37° 53° 76 36 3 0 0
02-19 39° 46° 96 46 4 0 0
02-20 39° 58° 122 62 10 0 0
02-21 39° 52° 146 76 13 0 0
02-22 32° 38° 159 79 13 0 0
02-23 31° 40° 173 83 13 0 0
02-24 27° 38° 184 84 13 0 0
02-25 33° 56° 206 96 16 0 0
02-26 38° 53° 230 110 19 0 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 31° 56° 251 121 21 0 0
02-28 31° 64° 277 137 26 0 0
03-01 37° 55° 301 151 30 0 0
03-02 31° 36° 312 152 30 0 0
03-03 31° 42° 327 157 30 0 0
03-04 43° 54° 353 173 37 0 0
03-05 46° 58° 383 193 47 2 0
03-06 45° 52° 410 210 54 2 0
03-07 41° 64° 441 231 64 5 0
03-08 57° 74° 484 264 88 21 11
03-09 42° 75° 521 291 105 29 15
03-10 47° 84° 565 325 128 45 25
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 58° 86° 615 365 158 67 42
03-12 33° 78° 648 388 172 73 43
03-13 29° 55° 669 399 172 73 43
03-14 44° 60° 699 419 182 75 43
03-15 40° 57° 725 435 189 75 43
03-16 38° 66° 756 456 199 77 43
03-17 31° 40° 769 459 199 77 43
03-18 27° 41° 781 461 199 77 43
03-19 34° 58° 805 475 203 77 43
03-20 38° 72° 839 499 217 82 43
03-21 50° 70° 877 527 235 92 48
03-22 47° 84° 920 560 259 108 59
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 42° 69° 954 584 272 114 60
03-24 33° 52° 975 595 273 114 60
03-25 38° 59° 1001 611 279 114 60
03-26 50° 80° 1044 644 302 129 70
03-27 40° 74° 1079 669 317 136 71
03-28 34° 50° 1099 679 318 136 71
03-29 30° 62° 1123 693 321 136 71
03-30 53° 70° 1163 723 341 147 78
03-31 61° 83° 1213 763 371 169 95
04-01 65° 86° 1266 806 404 195 115
04-02 49° 65° 1301 831 419 201 117
04-03 50° 83° 1345 865 443 218 128
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 65° 86° 1399 909 477 243 149
04-05 63° 73° 1445 945 503 261 162
04-06 44° 61° 1475 965 513 264 162
04-07 42° 57° 1503 983 521 264 162
04-08 34° 56° 1526 996 524 264 162
04-09 36° 66° 1555 1015 533 265 162
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 31° 41° 14 4 0 0 0
02-16 37° 62° 42 22 8 0 0
02-17 31° 41° 56 26 8 0 0
02-18 22° 35° 63 26 8 0 0
02-19 19° 22° 63 26 8 0 0
02-20 21° 29° 66 26 8 0 0
02-21 25° 38° 75 26 8 0 0
02-22 20° 42° 84 26 8 0 0
02-23 25° 51° 100 32 8 0 0
02-24 29° 57° 121 43 9 0 0
02-25 36° 66° 150 62 18 1 0
02-26 37° 65° 179 81 27 2 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 46° 64° 212 104 40 7 0
02-28 43° 55° 240 121 47 7 0
03-01 31° 64° 265 137 53 7 0
03-02 21° 38° 273 137 53 7 0
03-03 23° 45° 285 139 53 7 0
03-04 32° 63° 310 154 58 7 0
03-05 52° 60° 344 178 72 13 1
03-06 39° 53° 368 192 76 13 1
03-07 34° 54° 390 203 77 13 1
03-08 38° 50° 411 215 79 13 1
03-09 27° 60° 433 227 81 13 1
03-10 35° 65° 461 245 89 13 1
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 34° 72° 492 266 100 17 1
03-12 49° 66° 528 291 115 24 4
03-13 43° 50° 552 306 120 24 4
03-14 40° 50° 575 319 123 24 4
03-15 45° 59° 604 338 132 26 4
03-16 52° 72° 645 368 152 38 11
03-17 42° 60° 673 387 161 39 11
03-18 38° 66° 704 407 171 41 11
03-19 38° 73° 737 431 185 46 12
03-20 47° 75° 776 460 204 58 18
03-21 38° 58° 802 476 210 58 18
03-22 40° 67° 834 498 221 61 18
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 39° 58° 860 514 228 61 18
03-24 48° 58° 891 535 239 64 18
03-25 46° 62° 924 558 251 68 18
03-26 41° 53° 949 573 256 68 18
03-27 34° 59° 973 587 261 68 18
03-28 42° 74° 1009 613 276 76 20
03-29 56° 83° 1056 650 304 95 35
03-30 68° 80° 1108 692 336 119 54
03-31 63° 84° 1159 733 367 142 72
04-01 44° 61° 1190 754 378 145 72
04-02 39° 58° 1217 770 384 145 72
04-03 53° 79° 1260 804 408 161 83
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 65° 75° 1308 842 436 181 98
04-05 60° 78° 1356 880 463 200 112
04-06 54° 64° 1392 906 480 209 116
04-07 45° 54° 1419 923 487 209 116
04-08 37° 48° 1440 934 488 209 116
04-09 30° 54° 1460 944 488 209 116
04-10 43° 59° 1489 963 497 210 116
04-11 45° 49° 1514 978 502 210 116
04-12 43° 52° 1540 994 507 210 116
04-13 45° 62° 1571 1015 519 213 116
04-14 46° 75° 1610 1044 538 224 122
04-15 53° 67° 1648 1072 556 234 126
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 45° 61° 1679 1093 567 237 126
04-17 39° 64° 1708 1112 576 238 126
04-18 44° 80° 1748 1142 596 250 133
04-19 68° 82° 1801 1185 629 275 153
04-20 63° 76° 1848 1222 656 294 167
04-21 57° 76° 1893 1257 680 311 179
04-22 62° 80° 1942 1296 710 332 195
04-23 52° 77° 1984 1328 732 346 204
04-24 49° 77° 2025 1359 753 359 213
04-25 51° 75° 2067 1390 774 373 221
04-26 54° 75° 2109 1423 797 387 230
04-27 48° 70° 2146 1450 814 396 234
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 44° 73° 2182 1476 830 404 238
04-29 53° 83° 2228 1512 856 422 250
04-30 65° 83° 2280 1554 888 446 269
05-01 62° 82° 2330 1594 917 468 286
05-02 68° 84° 2384 1638 952 494 307
05-03 68° 83° 2437 1681 985 519 327
05-04 63° 73° 2483 1717 1011 537 341
05-05 62° 73° 2529 1753 1037 555 353
05-06 61° 70° 2573 1786 1060 571 364
05-07 58° 73° 2616 1820 1084 586 374
05-08 59° 77° 2662 1856 1109 604 387
05-09 52° 66° 2699 1883 1126 613 391
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 47° 73° 2737 1911 1144 623 396
05-11 52° 80° 2781 1945 1169 639 407
05-12 54° 76° 2824 1978 1191 654 417
05-13 64° 67° 2867 2011 1215 669 427
05-14 62° 74° 2913 2047 1241 687 440
05-15 64° 80° 2964 2087 1271 710 458
05-16 67° 88° 3019 2133 1307 737 480
05-17 67° 85° 3073 2177 1341 763 501
05-18 66° 76° 3122 2216 1370 784 517
05-19 58° 75° 3167 2251 1394 801 529
05-20 53° 70° 3206 2280 1414 812 535
05-21 55° 61° 3242 2306 1430 820 539
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 55° 68° 3282 2336 1450 832 545
05-23 54° 66° 3320 2364 1468 842 550
05-24 49° 70° 3358 2392 1486 852 555
05-25 49° 71° 3396 2420 1503 862 560
05-26 57° 70° 3437 2451 1525 875 568
05-27 51° 66° 3474 2478 1542 884 572
05-28 53° 60° 3508 2502 1556 890 574
05-29 57° 71° 3550 2534 1578 904 583
05-30 62° 79° 3599 2572 1606 925 598
05-31 56° 71° 3640 2604 1627 938 606
06-01 46° 69° 3675 2629 1643 945 608
06-02 48° 75° 3715 2658 1662 957 615
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 50° 81° 3758 2692 1686 972 625
06-04 59° 86° 3809 2732 1716 995 643
06-05 66° 85° 3862 2776 1749 1020 663
06-06 65° 84° 3915 2818 1782 1045 683
06-07 68° 84° 3969 2863 1817 1071 704
06-08 70° 75° 4019 2903 1847 1093 722
06-09 68° 83° 4073 2947 1881 1119 742
06-10 71° 84° 4128 2992 1916 1146 765
06-11 64° 85° 4181 3035 1948 1171 784
06-12 65° 91° 4236 3080 1984 1198 806
06-13 68° 91° 4293 3127 2021 1227 831
06-14 71° 84° 4349 3173 2057 1255 853
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 65° 73° 4396 3210 2084 1274 867
06-16 63° 68° 4439 3243 2107 1289 877
06-17 66° 81° 4491 3285 2138 1313 896
06-18 74° 87° 4549 3333 2177 1343 921
06-19 70° 92° 4608 3382 2216 1374 947
06-20 63° 85° 4660 3424 2248 1398 966
06-21 67° 90° 4717 3471 2284 1427 990
06-22 73° 93° 4778 3522 2325 1460 1018
06-23 74° 97° 4842 3575 2369 1496 1049
06-24 77° 98° 4907 3631 2415 1533 1081
06-25 77° 98° 4972 3686 2460 1570 1113
06-26 75° 94° 5035 3739 2502 1605 1143
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 68° 75° 5084 3778 2532 1626 1159
06-28 70° 89° 5142 3825 2569 1656 1184
06-29 73° 91° 5202 3875 2609 1688 1211
06-30 73° 92° 5262 3926 2650 1720 1238
07-01 74° 90° 5322 3976 2690 1752 1265
07-02 72° 86° 5379 4023 2727 1781 1289
07-03 71° 89° 5437 4071 2765 1811 1314
07-04 67° 87° 5492 4116 2799 1838 1336
07-05 63° 87° 5545 4159 2832 1863 1356
07-06 65° 87° 5599 4202 2866 1889 1377
07-07 76° 91° 5660 4254 2908 1922 1405
07-08 75° 95° 5723 4307 2950 1957 1435
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 73° 89° 5782 4356 2989 1988 1461
07-10 73° 83° 5838 4402 3025 2016 1484
07-11 71° 90° 5896 4450 3064 2046 1510
07-12 74° 89° 5956 4500 3104 2078 1536
07-13 74° 85° 6014 4548 3141 2108 1561
07-14 74° 89° 6073 4597 3181 2139 1588
07-15 73° 88° 6132 4646 3220 2170 1613
07-16 74° 89° 6191 4695 3259 2201 1639
07-17 73° 93° 6252 4746 3300 2234 1667
07-18 77° 88° 6312 4796 3340 2266 1695
07-19 74° 87° 6371 4845 3379 2297 1720
07-20 74° 90° 6431 4895 3419 2329 1747
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 72° 86° 6488 4942 3456 2358 1771
07-22 67° 86° 6542 4986 3490 2384 1792
07-23 70° 85° 6598 5032 3526 2412 1815
07-24 69° 88° 6655 5079 3562 2441 1839
07-25 73° 96° 6717 5131 3605 2475 1868
07-26 74° 92° 6778 5182 3646 2508 1896
07-27 76° 92° 6840 5234 3688 2542 1925
07-28 74° 92° 6901 5285 3729 2575 1953
07-29 73° 94° 6963 5337 3771 2609 1982
07-30 76° 94° 7026 5390 3814 2644 2012
07-31 75° 91° 7087 5441 3855 2677 2040
08-01 67° 74° 7136 5479 3883 2698 2056
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 65° 79° 7186 5519 3913 2720 2073
08-03 60° 80° 7234 5558 3942 2740 2088
08-04 59° 84° 7283 5597 3971 2761 2104
08-05 66° 80° 7334 5638 4002 2784 2122
08-06 69° 77° 7386 5680 4033 2808 2141
08-07 66° 80° 7437 5721 4065 2831 2159
08-08 63° 80° 7487 5761 4095 2853 2176
08-09 61° 83° 7537 5801 4124 2875 2193
08-10 58° 85° 7586 5840 4154 2896 2209
08-11 65° 86° 7640 5884 4188 2922 2230
08-12 71° 91° 7699 5933 4227 2953 2256
08-13 74° 86° 7757 5981 4265 2983 2281
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 72° 91° 7816 6030 4304 3014 2308
08-15 72° 88° 7874 6078 4342 3044 2333
08-16 75° 90° 7935 6129 4383 3077 2360
08-17 73° 93° 7996 6180 4424 3110 2388
08-18 68° 74° 8045 6219 4453 3131 2404
08-19 66° 71° 8092 6255 4479 3150 2418
08-20 67° 83° 8145 6299 4512 3175 2438
08-21 66° 74° 8192 6336 4540 3194 2453
08-22 66° 82° 8244 6378 4572 3218 2471
08-23 61° 82° 8294 6418 4601 3240 2488
08-24 66° 84° 8347 6461 4634 3265 2508
08-25 66° 83° 8399 6503 4667 3289 2528
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 59° 80° 8446 6540 4694 3308 2542
08-27 59° 77° 8492 6576 4720 3326 2555
08-28 58° 80° 8540 6614 4748 3346 2569
08-29 60° 81° 8588 6652 4776 3366 2584
08-30 54° 76° 8631 6685 4799 3381 2595
08-31 52° 78° 8674 6718 4822 3396 2605
09-01 53° 78° 8718 6752 4846 3412 2615
09-02 55° 77° 8762 6786 4869 3428 2626
09-03 54° 82° 8807 6821 4895 3445 2639
09-04 62° 85° 8859 6863 4926 3469 2657
09-05 63° 88° 8912 6906 4960 3494 2678
09-06 71° 93° 8972 6956 5000 3526 2705
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 59° 75° 9018 6991 5025 3544 2717
09-08 51° 74° 9058 7022 5046 3556 2724
09-09 51° 75° 9099 7053 5067 3569 2732
09-10 60° 69° 9142 7086 5090 3584 2742
09-11 65° 79° 9192 7126 5120 3606 2759
09-12 60° 81° 9241 7164 5148 3627 2775
09-13 56° 83° 9288 7202 5176 3646 2789
09-14 63° 85° 9340 7244 5208 3670 2808
09-15 62° 81° 9390 7284 5237 3692 2825
09-16 59° 70° 9432 7316 5260 3706 2834
09-17 59° 67° 9473 7347 5281 3719 2842
09-18 64° 83° 9525 7388 5312 3743 2861
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 60° 89° 9577 7431 5345 3767 2880
09-20 66° 76° 9626 7470 5374 3788 2897
09-21 66° 74° 9674 7508 5402 3808 2911
09-22 61° 77° 9722 7545 5429 3828 2926
09-23 63° 84° 9773 7587 5461 3851 2944
09-24 66° 78° 9823 7627 5491 3873 2961
09-25 71° 80° 9877 7670 5524 3899 2982
09-26 68° 83° 9930 7714 5558 3924 3002
09-27 67° 78° 9981 7755 5588 3947 3020
09-28 65° 83° 10000 7796 5620 3970 3039
09-29 62° 77° 10000 7834 5648 3990 3053
09-30 67° 74° 10000 7872 5676 4011 3069
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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