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 Fri, Apr. 3. 2026

 

Forecasted GDD Total: 573 (Base 32) through Fri, Apr. 3, 2026

  

New Brunswick, NJ

        

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

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 27° 40° 12 2 0 0 0
02-16 30° 38° 24 4 0 0 0
02-17 32° 46° 41 11 0 0 0
02-18 34° 39° 55 15 0 0 0
02-19 36° 39° 71 21 0 0 0
02-20 35° 38° 85 25 0 0 0
02-21 35° 46° 104 34 0 0 0
02-22 30° 36° 115 35 0 0 0
02-23 29° 35° 126 36 0 0 0
02-24 21° 31° 130 36 0 0 0
02-25 22° 42° 140 36 0 0 0
02-26 29° 45° 155 41 0 0 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 25° 43° 167 43 0 0 0
02-28 28° 51° 185 51 0 0 0
03-01 32° 43° 200 56 0 0 0
03-02 23° 31° 205 56 0 0 0
03-03 24° 34° 213 56 0 0 0
03-04 34° 43° 229 63 0 0 0
03-05 39° 41° 247 71 0 0 0
03-06 37° 41° 264 78 0 0 0
03-07 36° 50° 285 89 1 0 0
03-08 49° 68° 321 115 17 8 3
03-09 41° 70° 355 138 31 14 4
03-10 43° 78° 393 167 49 24 9
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 51° 73° 434 197 69 36 16
03-12 35° 64° 461 215 77 36 16
03-13 30° 44° 476 220 77 36 16
03-14 33° 51° 496 230 77 36 16
03-15 36° 44° 515 238 77 36 16
03-16 45° 64° 547 261 90 41 16
03-17 32° 53° 568 271 90 41 16
03-18 26° 37° 577 271 90 41 16
03-19 31° 45° 593 277 90 41 16
03-20 34° 62° 619 293 96 41 16
03-21 48° 57° 650 314 107 44 16
03-22 44° 66° 683 337 120 49 16
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 36° 50° 704 348 121 49 16
03-24 31° 49° 722 356 121 49 16
03-25 34° 54° 744 368 123 49 16
03-26 46° 74° 782 396 141 59 21
03-27 43° 66° 814 418 153 63 21
03-28 31° 43° 830 424 153 63 21
03-29 29° 55° 850 434 153 63 21
03-30 45° 69° 884 458 168 69 23
03-31 61° 77° 931 495 195 88 37
04-01 56° 79° 977 531 221 106 49
04-02 42° 54° 1003 547 227 106 49
04-03 41° 75° 1039 573 242 114 52
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 58° 73° 1082 606 266 129 63
04-05 49° 71° 1120 634 284 139 68
04-06 42° 56° 1147 651 291 139 68
04-07 39° 53° 1171 665 295 139 68
04-08 32° 51° 1190 674 295 139 68
04-09 35° 61° 1216 690 301 139 68
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 28° 36° 10 0 0 0 0
02-16 34° 45° 27 8 0 0 0
02-17 28° 35° 37 8 0 0 0
02-18 19° 27° 38 8 0 0 0
02-19 17° 31° 40 8 0 0 0
02-20 18° 28° 41 8 0 0 0
02-21 20° 35° 47 8 0 0 0
02-22 21° 40° 55 8 0 0 0
02-23 30° 45° 71 13 0 0 0
02-24 31° 51° 90 23 0 0 0
02-25 39° 56° 116 38 6 0 0
02-26 38° 55° 140 53 10 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 42° 52° 165 68 15 0 0
02-28 38° 49° 187 79 17 0 0
03-01 30° 61° 210 93 20 0 0
03-02 21° 35° 216 93 20 0 0
03-03 21° 39° 224 93 20 0 0
03-04 28° 54° 243 102 20 0 0
03-05 41° 58° 271 119 28 0 0
03-06 35° 55° 294 132 31 0 0
03-07 34° 50° 313 142 31 0 0
03-08 37° 45° 332 151 31 0 0
03-09 30° 53° 352 160 31 0 0
03-10 39° 64° 381 180 40 1 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 36° 65° 410 199 49 2 0
03-12 41° 52° 435 213 53 2 0
03-13 38° 47° 455 224 54 2 0
03-14 39° 53° 479 238 58 2 0
03-15 41° 49° 502 251 61 2 0
03-16 45° 65° 535 274 74 8 0
03-17 39° 62° 564 292 83 8 0
03-18 33° 61° 589 307 88 8 0
03-19 37° 60° 615 324 94 8 0
03-20 42° 52° 640 339 99 8 0
03-21 38° 51° 663 351 102 8 0
03-22 36° 60° 689 368 108 8 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 31° 48° 707 376 108 8 0
03-24 39° 50° 730 388 111 8 0
03-25 44° 58° 758 407 119 8 0
03-26 39° 51° 781 420 122 8 0
03-27 32° 52° 801 429 122 8 0
03-28 41° 62° 830 449 132 10 0
03-29 46° 79° 871 479 152 22 8
03-30 43° 48° 894 493 156 22 8
03-31 46° 76° 933 522 175 33 14
04-01 40° 58° 961 539 182 33 14
04-02 36° 46° 979 548 182 33 14
04-03 45° 72° 1016 575 199 42 18
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 58° 71° 1059 607 222 57 27
04-05 45° 58° 1089 627 231 59 27
04-06 44° 56° 1117 645 239 59 27
04-07 40° 51° 1140 659 243 59 27
04-08 38° 46° 1160 669 243 59 27
04-09 31° 49° 1178 676 243 59 27
04-10 37° 50° 1200 688 244 59 27
04-11 42° 45° 1221 700 246 59 27
04-12 37° 42° 1239 707 246 59 27
04-13 40° 58° 1265 724 253 59 27
04-14 41° 65° 1297 745 264 62 27
04-15 50° 68° 1334 772 281 71 31
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 46° 51° 1360 789 288 71 31
04-17 42° 62° 1390 809 298 73 31
04-18 38° 69° 1422 830 309 76 31
04-19 58° 82° 1469 868 337 96 46
04-20 54° 72° 1511 899 358 109 54
04-21 47° 56° 1540 919 368 111 54
04-22 53° 77° 1584 952 391 126 65
04-23 54° 73° 1625 983 412 140 73
04-24 50° 76° 1666 1015 434 153 81
04-25 53° 77° 1710 1048 457 168 92
04-26 58° 71° 1752 1081 480 183 101
04-27 49° 62° 1786 1104 493 188 102
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 49° 73° 1825 1133 512 199 108
04-29 50° 79° 1867 1166 534 214 117
04-30 59° 73° 1911 1199 558 229 128
05-01 48° 66° 1946 1224 573 237 130
05-02 55° 82° 1993 1261 600 255 144
05-03 60° 83° 2042 1301 630 277 160
05-04 61° 70° 2086 1334 653 292 171
05-05 58° 62° 2123 1362 671 302 175
05-06 57° 68° 2164 1393 692 315 183
05-07 56° 73° 2207 1425 714 329 193
05-08 56° 75° 2250 1459 738 345 203
05-09 53° 60° 2285 1484 752 352 205
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 50° 73° 2325 1513 772 363 212
05-11 50° 77° 2366 1545 793 377 220
05-12 51° 73° 2406 1574 813 389 227
05-13 59° 67° 2447 1606 835 402 235
05-14 59° 62° 2486 1634 853 412 241
05-15 60° 68° 2528 1667 875 427 250
05-16 62° 73° 2574 1702 901 445 263
05-17 64° 84° 2626 1744 933 468 282
05-18 62° 73° 2671 1780 958 486 294
05-19 57° 70° 2712 1811 980 499 302
05-20 47° 68° 2748 1837 996 507 305
05-21 50° 58° 2781 1859 1008 511 305
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 49° 52° 2809 1878 1017 512 305
05-23 48° 64° 2844 1902 1031 518 307
05-24 48° 64° 2878 1927 1046 525 308
05-25 51° 68° 2916 1954 1063 534 312
05-26 51° 72° 2955 1983 1082 545 319
05-27 52° 72° 2995 2013 1102 558 326
05-28 54° 63° 3031 2040 1119 566 329
05-29 55° 68° 3071 2069 1138 577 336
05-30 60° 74° 3116 2104 1163 594 348
05-31 55° 67° 3155 2133 1182 606 354
06-01 48° 67° 3191 2159 1198 613 356
06-02 49° 71° 3229 2187 1216 624 362
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 54° 78° 3273 2221 1240 640 373
06-04 56° 84° 3321 2259 1268 660 388
06-05 66° 86° 3375 2304 1302 686 409
06-06 67° 84° 3429 2347 1336 711 429
06-07 68° 78° 3480 2388 1367 734 448
06-08 63° 73° 3526 2424 1393 752 461
06-09 62° 65° 3567 2455 1414 766 469
06-10 63° 78° 3615 2494 1443 786 484
06-11 63° 82° 3666 2534 1473 809 502
06-12 67° 89° 3722 2580 1509 836 525
06-13 67° 76° 3771 2620 1539 858 541
06-14 60° 68° 3813 2652 1561 872 550
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 59° 61° 3852 2680 1579 882 555
06-16 60° 65° 3892 2711 1600 895 563
06-17 62° 69° 3936 2744 1623 910 573
06-18 66° 82° 3987 2786 1655 934 592
06-19 70° 88° 4044 2833 1692 963 616
06-20 67° 82° 4097 2875 1724 988 636
06-21 70° 87° 4154 2922 1761 1016 660
06-22 72° 86° 4211 2970 1798 1046 684
06-23 77° 94° 4274 3023 1842 1081 714
06-24 77° 98° 4340 3079 1888 1119 747
06-25 78° 95° 4405 3134 1933 1156 779
06-26 68° 83° 4458 3177 1966 1181 799
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 65° 69° 4503 3212 1991 1198 811
06-28 64° 84° 4556 3254 2023 1222 830
06-29 74° 89° 4615 3304 2062 1254 857
06-30 71° 87° 4672 3350 2099 1283 881
07-01 73° 87° 4730 3399 2138 1313 906
07-02 71° 84° 4786 3445 2173 1341 929
07-03 68° 89° 4842 3491 2210 1369 952
07-04 65° 82° 4894 3533 2241 1393 971
07-05 64° 86° 4947 3575 2274 1417 991
07-06 69° 88° 5003 3622 2311 1446 1014
07-07 75° 85° 5062 3670 2349 1476 1039
07-08 74° 94° 5123 3722 2391 1510 1068
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 73° 91° 5183 3772 2431 1542 1095
07-10 69° 80° 5236 3815 2464 1567 1115
07-11 72° 84° 5292 3860 2499 1595 1138
07-12 72° 83° 5348 3906 2535 1622 1161
07-13 73° 83° 5404 3952 2571 1650 1184
07-14 73° 86° 5461 4000 2609 1680 1208
07-15 73° 85° 5519 4047 2646 1709 1233
07-16 75° 87° 5578 4096 2685 1741 1259
07-17 75° 89° 5638 4147 2726 1773 1286
07-18 72° 81° 5693 4191 2760 1799 1308
07-19 69° 78° 5745 4233 2792 1823 1326
07-20 74° 87° 5803 4282 2831 1854 1352
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 69° 85° 5859 4327 2866 1881 1375
07-22 65° 78° 5908 4367 2896 1903 1391
07-23 65° 82° 5960 4408 2927 1927 1410
07-24 66° 87° 6015 4453 2962 1953 1431
07-25 74° 93° 6076 4504 3003 1986 1460
07-26 75° 82° 6132 4551 3040 2015 1483
07-27 70° 85° 6188 4597 3075 2043 1506
07-28 75° 92° 6250 4648 3117 2076 1535
07-29 75° 95° 6313 4701 3160 2111 1564
07-30 76° 93° 6375 4754 3203 2146 1594
07-31 67° 87° 6430 4799 3238 2173 1616
08-01 64° 73° 6477 4835 3264 2191 1629
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 62° 79° 6525 4874 3292 2212 1645
08-03 61° 82° 6574 4913 3322 2233 1661
08-04 61° 86° 6626 4954 3353 2257 1680
08-05 66° 83° 6678 4997 3386 2281 1699
08-06 69° 76° 6729 5038 3417 2304 1717
08-07 66° 77° 6779 5078 3447 2326 1734
08-08 61° 79° 6827 5116 3474 2346 1749
08-09 58° 82° 6875 5153 3502 2366 1764
08-10 60° 86° 6926 5195 3533 2389 1782
08-11 65° 86° 6979 5238 3567 2414 1802
08-12 66° 88° 7034 5283 3602 2441 1824
08-13 72° 90° 7094 5332 3641 2472 1850
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 73° 87° 7152 5380 3679 2502 1875
08-15 74° 85° 7209 5428 3716 2532 1900
08-16 74° 84° 7266 5475 3754 2561 1924
08-17 71° 91° 7325 5523 3792 2591 1950
08-18 66° 75° 7374 5562 3821 2612 1965
08-19 65° 74° 7421 5600 3848 2632 1980
08-20 61° 70° 7464 5633 3872 2647 1990
08-21 60° 73° 7508 5667 3896 2663 2001
08-22 59° 83° 7557 5706 3925 2684 2017
08-23 61° 81° 7607 5745 3954 2705 2034
08-24 63° 80° 7656 5785 3983 2727 2050
08-25 68° 83° 7710 5828 4017 2752 2071
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 60° 78° 7757 5865 4044 2771 2085
08-27 58° 75° 7801 5900 4069 2788 2096
08-28 53° 78° 7845 5933 4092 2803 2107
08-29 61° 78° 7892 5971 4119 2823 2121
08-30 55° 76° 7935 6004 4143 2838 2131
08-31 54° 78° 7979 6038 4167 2854 2142
09-01 58° 77° 8024 6073 4192 2871 2154
09-02 58° 74° 8069 6107 4216 2887 2166
09-03 57° 77° 8114 6142 4241 2905 2178
09-04 59° 80° 8161 6180 4269 2924 2192
09-05 67° 84° 8215 6223 4302 2949 2213
09-06 68° 84° 8269 6268 4336 2976 2234
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 61° 71° 8313 6301 4360 2992 2245
09-08 54° 73° 8355 6333 4382 3005 2254
09-09 55° 72° 8396 6365 4403 3019 2262
09-10 62° 72° 8441 6399 4428 3035 2274
09-11 59° 80° 8488 6437 4456 3055 2288
09-12 58° 77° 8534 6472 4481 3073 2301
09-13 60° 78° 8581 6509 4508 3091 2315
09-14 64° 80° 8631 6549 4538 3113 2332
09-15 63° 77° 8679 6588 4566 3134 2347
09-16 64° 73° 8726 6624 4593 3152 2360
09-17 63° 68° 8769 6658 4616 3168 2371
09-18 66° 83° 8821 6700 4649 3192 2390
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 64° 83° 8872 6741 4680 3215 2408
09-20 61° 72° 8917 6775 4704 3232 2420
09-21 57° 68° 8958 6806 4725 3244 2428
09-22 53° 73° 8999 6837 4746 3257 2436
09-23 62° 82° 9049 6877 4776 3279 2453
09-24 67° 78° 9099 6918 4807 3302 2470
09-25 71° 79° 9152 6961 4839 3327 2490
09-26 67° 80° 9204 7002 4871 3350 2509
09-27 63° 77° 9252 7040 4899 3370 2524
09-28 64° 82° 9303 7082 4931 3394 2542
09-29 66° 75° 9351 7120 4959 3414 2557
09-30 62° 79° 9400 7158 4987 3435 2573
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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