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 Sat, Apr. 18. 2026

 

GDD Total: 545 (Base 32) through Sat, Apr. 18, 2026

  

Bedford, NH

        

Forecast »

“Flashback” to 2025

4/12

4/13

4/14

4/15

4/16

4/17

4/18

4/19

4/20

4/21

4/22

4/23

4/24

Done

801

Late

500

Optimum

250

Early

171

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 13° 34° 1 0 0 0 0
02-16 17° 35° 6 0 0 0 0
02-17 22° 36° 12 0 0 0 0
02-18 25° 41° 23 1 0 0 0
02-19 26° 41° 35 3 0 0 0
02-20 30° 37° 47 4 0 0 0
02-21 23° 30° 51 4 0 0 0
02-22 19° 32° 55 4 0 0 0
02-23 23° 29° 59 4 0 0 0
02-24 15° 30° 60 4 0 0 0
02-25 6° 36° 60 4 0 0 0
02-26 20° 38° 67 4 0 0 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 13° 40° 71 4 0 0 0
02-28 18° 48° 82 5 0 0 0
03-01 22° 35° 89 5 0 0 0
03-02 10° 29° 89 5 0 0 0
03-03 7° 30° 89 5 0 0 0
03-04 22° 51° 103 10 0 0 0
03-05 26° 41° 114 11 0 0 0
03-06 24° 32° 121 11 0 0 0
03-07 31° 43° 136 16 0 0 0
03-08 39° 55° 161 31 5 0 0
03-09 31° 65° 187 47 11 0 0
03-10 35° 77° 221 71 25 6 1
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 38° 49° 242 82 26 6 1
03-12 35° 49° 262 92 26 6 1
03-13 26° 40° 273 93 26 6 1
03-14 28° 42° 286 96 26 6 1
03-15 25° 41° 297 98 26 6 1
03-16 35° 60° 323 113 32 6 1
03-17 27° 60° 345 125 34 6 1
03-18 21° 34° 350 125 34 6 1
03-19 26° 38° 360 125 34 6 1
03-20 27° 54° 379 134 34 6 1
03-21 36° 45° 400 144 34 6 1
03-22 32° 42° 415 149 34 6 1
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 33° 35° 427 151 34 6 1
03-24 30° 47° 443 158 34 6 1
03-25 27° 54° 462 166 34 6 1
03-26 39° 64° 491 186 43 7 1
03-27 29° 52° 509 194 43 7 1
03-28 21° 36° 516 194 43 7 1
03-29 22° 51° 530 198 43 7 1
03-30 36° 70° 561 219 54 10 1
03-31 39° 53° 585 233 58 10 1
04-01 39° 66° 615 254 69 13 1
04-02 33° 43° 632 260 69 13 1
04-03 33° 62° 657 276 74 13 1
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 37° 57° 683 291 80 13 1
04-05 37° 48° 703 301 80 13 1
04-06 32° 46° 720 308 80 13 1
04-07 28° 42° 733 311 80 13 1
04-08 27° 48° 748 317 80 13 1
04-09 28° 61° 771 329 82 13 1
04-10 36° 74° 803 351 95 17 1
04-11 43° 57° 831 370 103 17 1
04-12 32° 56° 853 381 105 17 1
04-13 42° 70° 887 406 119 24 2
04-14 54° 81° 933 441 144 41 15
04-15 52° 72° 973 471 164 53 22
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 49° 70° 1010 498 182 62 26
04-17 51° 66° 1046 525 198 71 29
04-18 43° 62° 1077 545 208 73 29
04-19 42° 50° 1101 559 213 73 29
04-20 32° 49° 1119 568 213 73 29
04-21 26° 52° 1137 575 213 73 29
04-22 34° 55° 1159 588 215 73 29
04-23 36° 62° 1186 605 222 73 29
04-24 39° 63° 1215 624 231 74 29
04-25 39° 61° 1243 642 240 74 29
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 10° 27° 0 0 0 0 0
02-16 21° 30° 3 0 0 0 0
02-17 18° 26° 3 0 0 0 0
02-18 13° 23° 3 0 0 0 0
02-19 7° 28° 3 0 0 0 0
02-20 6° 29° 3 0 0 0 0
02-21 19° 29° 6 0 0 0 0
02-22 13° 34° 8 0 0 0 0
02-23 20° 39° 15 0 0 0 0
02-24 26° 42° 27 2 0 0 0
02-25 33° 49° 46 11 0 0 0
02-26 33° 46° 64 19 0 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 30° 38° 76 21 0 0 0
02-28 32° 40° 91 26 0 0 0
03-01 24° 49° 105 30 0 0 0
03-02 13° 25° 105 30 0 0 0
03-03 9° 30° 105 30 0 0 0
03-04 20° 46° 116 31 0 0 0
03-05 35° 51° 137 43 1 0 0
03-06 36° 57° 162 57 6 0 0
03-07 26° 40° 173 58 6 0 0
03-08 30° 36° 184 59 6 0 0
03-09 27° 41° 196 61 6 0 0
03-10 29° 58° 217 72 7 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 25° 66° 241 86 11 0 0
03-12 34° 51° 261 96 12 0 0
03-13 31° 45° 277 102 12 0 0
03-14 26° 58° 297 112 12 0 0
03-15 31° 66° 324 129 18 0 0
03-16 46° 67° 359 154 33 7 2
03-17 39° 63° 387 172 42 8 2
03-18 33° 54° 409 184 43 8 2
03-19 26° 61° 430 195 45 8 2
03-20 38° 54° 454 209 49 8 2
03-21 37° 46° 474 219 49 8 2
03-22 31° 62° 498 233 53 8 2
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 25° 41° 509 234 53 8 2
03-24 28° 34° 519 234 53 8 2
03-25 30° 47° 535 241 53 8 2
03-26 29° 49° 552 248 53 8 2
03-27 27° 49° 568 254 53 8 2
03-28 31° 57° 590 266 56 8 2
03-29 31° 48° 608 274 56 8 2
03-30 32° 38° 620 276 56 8 2
03-31 36° 61° 647 293 62 8 2
04-01 34° 56° 670 305 65 8 2
04-02 29° 45° 685 310 65 8 2
04-03 33° 57° 707 323 68 8 2
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 49° 65° 742 348 83 15 4
04-05 37° 46° 762 358 83 15 4
04-06 37° 53° 785 371 86 15 4
04-07 34° 44° 803 379 86 15 4
04-08 28° 38° 814 380 86 15 4
04-09 25° 44° 827 383 86 15 4
04-10 25° 51° 843 389 86 15 4
04-11 33° 43° 859 395 86 15 4
04-12 32° 36° 872 397 86 15 4
04-13 35° 47° 891 406 86 15 4
04-14 35° 68° 920 426 95 16 4
04-15 47° 69° 956 452 111 24 7
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 38° 49° 978 464 113 24 7
04-17 38° 58° 1003 479 119 24 7
04-18 30° 68° 1031 497 126 24 7
04-19 57° 80° 1077 533 153 42 20
04-20 46° 67° 1112 558 167 49 22
04-21 34° 63° 1138 574 174 49 22
04-22 44° 74° 1175 601 191 58 26
04-23 44° 70° 1210 626 206 65 28
04-24 40° 74° 1245 651 220 71 29
04-25 50° 70° 1283 679 238 81 34
04-26 55° 64° 1320 706 255 91 39
04-27 43° 52° 1345 721 261 91 39
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 46° 74° 1383 749 279 100 44
04-29 41° 82° 1423 779 298 112 50
04-30 51° 68° 1461 807 316 122 55
05-01 40° 72° 1495 831 330 128 56
05-02 48° 75° 1535 860 350 140 63
05-03 57° 80° 1581 897 376 158 76
05-04 53° 64° 1618 923 393 167 80
05-05 49° 54° 1647 943 402 168 80
05-06 49° 56° 1677 963 413 170 80
05-07 54° 70° 1717 993 433 182 87
05-08 50° 74° 1757 1023 453 195 94
05-09 45° 56° 1786 1042 461 195 94
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 46° 61° 1817 1063 473 198 94
05-11 44° 65° 1850 1086 485 203 94
05-12 38° 77° 1885 1111 501 210 97
05-13 50° 71° 1923 1139 519 221 102
05-14 45° 76° 1962 1168 538 231 107
05-15 58° 70° 2004 1200 560 245 117
05-16 63° 81° 2055 1240 590 268 134
05-17 63° 77° 2102 1278 618 288 149
05-18 56° 65° 2141 1307 636 298 154
05-19 47° 58° 2171 1327 647 300 154
05-20 46° 59° 2202 1347 657 303 154
05-21 45° 50° 2227 1363 663 303 154
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 43° 46° 2250 1376 665 303 154
05-23 42° 54° 2276 1392 671 303 154
05-24 47° 58° 2306 1412 682 305 154
05-25 46° 58° 2337 1432 692 308 154
05-26 44° 72° 2372 1458 708 315 157
05-27 45° 79° 2412 1488 728 327 164
05-28 53° 80° 2457 1522 752 344 175
05-29 57° 67° 2497 1553 772 356 183
05-30 56° 73° 2540 1586 795 371 192
05-31 52° 68° 2577 1613 813 380 197
06-01 49° 62° 2611 1637 827 386 198
06-02 43° 71° 2646 1662 842 393 200
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 45° 79° 2687 1693 862 406 207
06-04 52° 86° 2734 1730 889 425 221
06-05 60° 93° 2789 1774 924 452 243
06-06 66° 79° 2839 1815 954 474 261
06-07 60° 69° 2881 1847 977 488 270
06-08 55° 72° 2923 1879 998 502 278
06-09 56° 63° 2960 1906 1016 511 283
06-10 55° 62° 2997 1933 1032 520 286
06-11 54° 81° 3042 1968 1058 537 299
06-12 63° 84° 3093 2009 1089 560 317
06-13 56° 71° 3135 2041 1110 574 326
06-14 54° 61° 3171 2066 1126 582 328
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 54° 70° 3211 2097 1146 594 335
06-16 50° 75° 3251 2127 1167 606 343
06-17 55° 69° 3291 2157 1187 618 350
06-18 65° 76° 3340 2196 1215 639 365
06-19 67° 91° 3397 2243 1252 668 390
06-20 67° 81° 3449 2285 1285 692 409
06-21 57° 84° 3498 2324 1313 713 425
06-22 67° 90° 3555 2370 1350 742 448
06-23 67° 96° 3614 2420 1390 773 475
06-24 73° 100° 3679 2475 1434 810 507
06-25 74° 93° 3740 2526 1476 843 535
06-26 61° 77° 3788 2564 1503 863 550
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 57° 76° 3832 2598 1528 879 561
06-28 57° 65° 3871 2627 1547 890 567
06-29 62° 79° 3920 2666 1576 911 583
06-30 60° 87° 3972 2708 1607 935 601
07-01 70° 90° 4030 2756 1645 965 627
07-02 71° 86° 4086 2802 1682 993 650
07-03 65° 84° 4139 2845 1714 1018 670
07-04 58° 77° 4185 2881 1740 1036 682
07-05 54° 82° 4230 2916 1766 1053 695
07-06 65° 93° 4287 2963 1803 1082 719
07-07 71° 88° 4345 3011 1840 1112 743
07-08 70° 90° 4402 3058 1878 1141 768
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 68° 77° 4453 3099 1908 1164 786
07-10 63° 70° 4497 3133 1933 1180 797
07-11 62° 82° 4547 3173 1963 1202 814
07-12 67° 83° 4601 3217 1996 1228 834
07-13 66° 84° 4653 3259 2029 1252 854
07-14 70° 86° 4709 3305 2065 1280 877
07-15 72° 91° 4769 3355 2104 1312 904
07-16 68° 94° 4828 3403 2143 1343 929
07-17 74° 89° 4887 3453 2183 1374 956
07-18 63° 80° 4937 3493 2212 1396 972
07-19 53° 84° 4983 3529 2239 1414 986
07-20 68° 88° 5039 3575 2275 1442 1009
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 60° 75° 5085 3611 2300 1460 1021
07-22 51° 78° 5127 3643 2323 1474 1031
07-23 53° 84° 5173 3679 2349 1492 1044
07-24 65° 91° 5229 3725 2385 1520 1067
07-25 71° 91° 5288 3774 2424 1551 1093
07-26 61° 84° 5338 3814 2454 1573 1110
07-27 65° 73° 5386 3851 2481 1593 1124
07-28 66° 92° 5443 3899 2518 1622 1148
07-29 67° 97° 5503 3949 2558 1654 1176
07-30 69° 95° 5563 3999 2598 1686 1203
07-31 60° 76° 5609 4034 2624 1704 1215
08-01 58° 75° 5653 4069 2649 1720 1227
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 51° 78° 5696 4102 2671 1735 1237
08-03 53° 84° 5742 4138 2698 1753 1250
08-04 59° 85° 5792 4178 2728 1775 1267
08-05 63° 78° 5841 4217 2757 1796 1283
08-06 58° 80° 5888 4254 2783 1815 1297
08-07 61° 83° 5938 4294 2813 1837 1313
08-08 57° 85° 5987 4333 2842 1858 1330
08-09 57° 87° 6037 4373 2872 1880 1346
08-10 59° 92° 6090 4416 2906 1905 1367
08-11 65° 94° 6148 4464 2943 1935 1391
08-12 65° 94° 6206 4511 2981 1965 1416
08-13 65° 94° 6263 4559 3019 1994 1441
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 70° 90° 6321 4607 3057 2024 1466
08-15 63° 81° 6371 4647 3087 2046 1483
08-16 56° 87° 6421 4687 3116 2068 1499
08-17 66° 91° 6477 4733 3152 2096 1523
08-18 58° 75° 6522 4768 3177 2113 1534
08-19 51° 72° 6562 4798 3197 2125 1541
08-20 56° 61° 6598 4824 3214 2133 1545
08-21 52° 72° 6638 4854 3234 2145 1552
08-22 51° 84° 6683 4889 3259 2162 1564
08-23 55° 85° 6732 4927 3287 2183 1579
08-24 59° 81° 6780 4965 3315 2203 1594
08-25 64° 79° 6829 5005 3345 2224 1611
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 59° 76° 6875 5041 3370 2242 1623
08-27 50° 71° 6913 5069 3389 2252 1629
08-28 46° 76° 6952 5098 3408 2263 1635
08-29 55° 72° 6994 5130 3429 2277 1644
08-30 50° 73° 7034 5159 3449 2289 1650
08-31 49° 78° 7075 5191 3471 2302 1659
09-01 51° 77° 7117 5223 3492 2316 1668
09-02 51° 79° 7160 5256 3515 2331 1677
09-03 53° 80° 7204 5290 3540 2347 1689
09-04 52° 79° 7248 5324 3563 2363 1700
09-05 63° 81° 7298 5364 3593 2385 1717
09-06 62° 83° 7349 5404 3624 2408 1734
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 57° 63° 7387 5433 3642 2418 1739
09-08 46° 70° 7423 5459 3658 2426 1743
09-09 44° 71° 7459 5485 3674 2434 1745
09-10 46° 71° 7495 5511 3691 2442 1749
09-11 46° 78° 7535 5541 3711 2454 1756
09-12 49° 74° 7575 5571 3730 2466 1763
09-13 47° 74° 7614 5600 3749 2477 1768
09-14 55° 77° 7658 5634 3773 2493 1779
09-15 53° 74° 7699 5665 3795 2506 1788
09-16 50° 75° 7739 5695 3815 2518 1795
09-17 47° 74° 7778 5723 3833 2529 1800
09-18 56° 82° 7825 5761 3860 2548 1814
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 57° 78° 7870 5796 3885 2565 1827
09-20 43° 69° 7904 5820 3900 2571 1828
09-21 39° 69° 7936 5842 3911 2575 1828
09-22 42° 74° 7971 5867 3927 2582 1830
09-23 55° 77° 8015 5901 3951 2598 1841
09-24 59° 66° 8056 5932 3972 2611 1849
09-25 60° 70° 8099 5965 3995 2626 1859
09-26 63° 77° 8148 6003 4023 2647 1874
09-27 56° 76° 8192 6038 4047 2663 1886
09-28 61° 83° 8241 6077 4077 2684 1902
09-29 50° 77° 8283 6109 4099 2698 1911
09-30 53° 76° 8326 6141 4121 2713 1920
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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