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 Tue, Sep. 15. 2026

 
  

Lauderdale, MN

        

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 26° 53° 18 8 0 0 0
02-16 34° 54° 40 20 2 0 0
02-17 33° 49° 59 29 2 0 0
02-18 28° 42° 72 32 2 0 0
02-19 27° 34° 81 32 2 0 0
02-20 20° 30° 84 32 2 0 0
02-21 11° 20° 84 32 2 0 0
02-22 6° 15° 84 32 2 0 0
02-23 5° 21° 84 32 2 0 0
02-24 18° 37° 89 32 2 0 0
02-25 12° 24° 89 32 2 0 0
02-26 16° 43° 96 32 2 0 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 25° 51° 113 38 2 0 0
02-28 16° 23° 113 38 2 0 0
03-01 13° 28° 113 38 2 0 0
03-02 21° 41° 122 38 2 0 0
03-03 34° 51° 142 49 3 0 0
03-04 30° 48° 159 56 3 0 0
03-05 37° 52° 181 68 5 0 0
03-06 43° 50° 206 83 9 0 0
03-07 27° 41° 218 85 9 0 0
03-08 34° 58° 242 99 14 0 0
03-09 41° 55° 269 115 20 0 0
03-10 31° 41° 283 119 20 0 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 26° 40° 294 120 20 0 0
03-12 23° 41° 304 120 20 0 0
03-13 26° 42° 316 123 20 0 0
03-14 22° 32° 321 123 20 0 0
03-15 25° 31° 327 123 20 0 0
03-16 6° 21° 327 123 20 0 0
03-17 -5° 18° 327 123 20 0 0
03-18 18° 44° 336 123 20 0 0
03-19 29° 53° 355 132 20 0 0
03-20 44° 61° 385 152 30 2 0
03-21 43° 79° 424 181 49 13 6
03-22 34° 48° 442 190 49 13 6
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 25° 45° 455 193 49 13 6
03-24 37° 54° 479 206 52 13 6
03-25 42° 73° 514 231 67 20 8
03-26 33° 56° 536 244 70 20 8
03-27 24° 36° 545 244 70 20 8
03-28 19° 57° 561 250 70 20 8
03-29 43° 69° 595 273 83 26 9
03-30 38° 72° 628 297 97 31 9
03-31 34° 52° 649 308 98 31 9
04-01 30° 43° 664 313 98 31 9
04-02 31° 38° 677 316 98 31 9
04-03 31° 38° 690 319 98 31 9
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 33° 37° 703 322 98 31 9
04-05 31° 52° 722 331 98 31 9
04-06 28° 41° 735 334 98 31 9
04-07 18° 43° 744 334 98 31 9
04-08 38° 61° 771 351 106 31 9
04-09 35° 48° 790 361 106 31 9
04-10 33° 55° 812 372 107 31 9
04-11 33° 47° 830 380 107 31 9
04-12 48° 78° 871 411 128 44 17
04-13 51° 67° 908 438 145 53 21
04-14 48° 62° 941 461 158 58 21
04-15 42° 67° 973 484 171 63 21
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 43° 78° 1012 512 189 73 26
04-17 40° 68° 1044 534 201 77 26
04-18 30° 45° 1059 539 201 77 26
04-19 32° 45° 1075 546 201 77 26
04-20 27° 62° 1098 558 203 77 26
04-21 41° 75° 1134 584 220 85 30
04-22 47° 84° 1178 618 243 101 40
04-23 61° 72° 1222 653 268 118 52
04-24 42° 63° 1253 673 278 120 52
04-25 44° 56° 1281 691 286 120 52
04-26 44° 62° 1312 712 297 123 52
04-27 45° 56° 1341 731 306 124 52
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 41° 56° 1367 747 312 124 52
04-29 37° 52° 1389 760 315 124 52
04-30 32° 50° 1409 769 315 124 52
05-01 38° 52° 1432 782 318 124 52
05-02 35° 65° 1460 800 326 124 52
05-03 50° 70° 1498 828 344 134 57
05-04 45° 62° 1529 849 355 137 57
05-05 37° 50° 1550 861 357 137 57
05-06 33° 45° 1567 867 357 137 57
05-07 31° 57° 1590 880 359 137 57
05-08 40° 71° 1623 903 373 143 57
05-09 49° 60° 1655 926 385 147 57
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 40° 58° 1683 943 392 147 57
05-11 36° 66° 1712 962 401 148 57
05-12 55° 69° 1752 992 421 161 65
05-13 42° 71° 1786 1017 436 167 66
05-14 48° 78° 1828 1048 457 180 74
05-15 58° 86° 1878 1088 487 202 92
05-16 54° 78° 1922 1122 511 219 103
05-17 53° 68° 1960 1151 530 229 108
05-18 54° 63° 1997 1177 546 238 112
05-19 48° 58° 2028 1198 557 241 112
05-20 37° 60° 2054 1215 564 241 112
05-21 44° 64° 2086 1236 575 244 112
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 50° 64° 2121 1261 590 251 114
05-23 53° 64° 2157 1288 607 260 117
05-24 46° 82° 2200 1320 629 274 126
05-25 61° 84° 2250 1360 660 296 144
05-26 67° 86° 2305 1405 694 323 166
05-27 64° 89° 2359 1450 729 350 187
05-28 61° 83° 2409 1489 759 371 204
05-29 62° 85° 2461 1531 790 395 222
05-30 64° 82° 2512 1572 821 418 240
05-31 60° 72° 2556 1606 845 434 251
06-01 60° 77° 2602 1643 872 453 265
06-02 56° 82° 2649 1680 899 472 279
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 62° 83° 2700 1720 929 494 297
06-04 66° 82° 2752 1762 962 518 316
06-05 64° 79° 2802 1802 991 540 332
06-06 61° 84° 2853 1843 1022 563 350
06-07 65° 86° 2906 1887 1056 589 371
06-08 68° 81° 2959 1929 1088 613 391
06-09 68° 87° 3014 1975 1124 641 413
06-10 68° 88° 3070 2021 1160 669 436
06-11 58° 73° 3114 2054 1183 684 447
06-12 57° 80° 3160 2091 1210 703 460
06-13 60° 73° 3205 2125 1234 719 472
06-14 55° 73° 3247 2157 1256 733 480
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 50° 78° 3289 2189 1278 747 489
06-16 54° 71° 3329 2219 1298 759 497
06-17 56° 64° 3367 2247 1316 769 502
06-18 55° 69° 3407 2277 1336 781 509
06-19 49° 73° 3446 2306 1355 792 514
06-20 53° 74° 3487 2337 1377 806 523
06-21 53° 74° 3529 2369 1398 819 531
06-22 53° 76° 3571 2401 1420 833 541
06-23 58° 76° 3616 2436 1445 850 552
06-24 59° 76° 3661 2472 1471 868 565
06-25 57° 71° 3703 2503 1493 882 574
06-26 54° 77° 3747 2537 1517 897 585
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 61° 80° 3796 2576 1545 918 600
06-28 65° 80° 3846 2616 1575 940 618
06-29 74° 91° 3906 2667 1616 973 645
06-30 74° 89° 3966 2716 1655 1004 672
07-01 68° 82° 4019 2759 1688 1029 692
07-02 68° 81° 4071 2801 1721 1054 711
07-03 70° 85° 4127 2847 1756 1081 733
07-04 66° 85° 4180 2890 1790 1106 754
07-05 63° 85° 4232 2933 1822 1131 773
07-06 68° 86° 4287 2978 1857 1158 795
07-07 66° 80° 4338 3019 1888 1181 813
07-08 71° 79° 4392 3062 1921 1206 833
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 66° 83° 4444 3104 1953 1230 853
07-10 63° 87° 4497 3147 1986 1255 873
07-11 68° 88° 4553 3193 2023 1283 896
07-12 72° 90° 4612 3242 2061 1314 922
07-13 71° 93° 4672 3292 2102 1346 949
07-14 71° 94° 4732 3342 2142 1379 976
07-15 72° 93° 4793 3393 2182 1411 1004
07-16 69° 91° 4851 3441 2221 1442 1029
07-17 74° 94° 4913 3494 2263 1476 1058
07-18 69° 87° 4969 3539 2299 1504 1081
07-19 67° 88° 5025 3585 2334 1531 1103
07-20 70° 90° 5083 3633 2372 1561 1129
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 67° 78° 5133 3674 2403 1584 1146
07-22 57° 71° 5176 3706 2425 1598 1155
07-23 52° 79° 5219 3740 2449 1614 1166
07-24 67° 80° 5271 3781 2480 1637 1185
07-25 70° 86° 5327 3827 2516 1665 1207
07-26 73° 97° 5390 3880 2559 1700 1237
07-27 77° 97° 5455 3935 2604 1737 1269
07-28 67° 87° 5510 3980 2639 1764 1292
07-29 68° 91° 5568 4028 2677 1794 1316
07-30 72° 88° 5626 4076 2715 1824 1341
07-31 65° 77° 5675 4115 2744 1845 1357
08-01 64° 84° 5727 4157 2776 1869 1376
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 62° 83° 5777 4198 2807 1892 1394
08-03 66° 85° 5831 4241 2841 1918 1415
08-04 62° 76° 5878 4279 2868 1937 1429
08-05 57° 79° 5924 4315 2894 1955 1442
08-06 58° 81° 5972 4352 2921 1974 1457
08-07 66° 76° 6021 4391 2950 1995 1473
08-08 56° 81° 6068 4428 2977 2014 1486
08-09 67° 83° 6121 4471 3010 2039 1507
08-10 66° 84° 6174 4514 3043 2064 1527
08-11 69° 86° 6229 4559 3079 2091 1549
08-12 67° 87° 6284 4604 3114 2119 1571
08-13 70° 76° 6335 4645 3145 2141 1589
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 64° 80° 6385 4685 3175 2163 1606
08-15 67° 79° 6437 4727 3206 2187 1624
08-16 65° 79° 6487 4767 3236 2209 1642
08-17 57° 84° 6536 4806 3265 2230 1657
08-18 64° 81° 6586 4846 3296 2253 1675
08-19 54° 79° 6631 4881 3320 2269 1686
08-20 56° 79° 6676 4916 3346 2287 1699
08-21 65° 81° 6727 4957 3377 2310 1717
08-22 61° 78° 6774 4995 3404 2329 1731
08-23 51° 79° 6818 5028 3427 2344 1741
08-24 55° 81° 6864 5064 3453 2362 1755
08-25 67° 80° 6915 5105 3485 2386 1773
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 64° 79° 6965 5145 3514 2407 1790
08-27 58° 81° 7012 5182 3541 2426 1804
08-28 53° 82° 7058 5218 3567 2444 1817
08-29 66° 78° 7108 5258 3597 2466 1833
08-30 66° 85° 7161 5302 3631 2492 1854
08-31 70° 90° 7219 5350 3669 2522 1879
09-01 63° 88° 7273 5393 3702 2547 1899
09-02 65° 87° 7327 5437 3736 2573 1920
09-03 71° 84° 7382 5482 3772 2600 1943
09-04 70° 85° 7438 5528 3807 2628 1965
09-05 66° 85° 7491 5571 3841 2654 1986
09-06 67° 80° 7543 5613 3872 2677 2005
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 67° 83° 7596 5656 3906 2702 2025
09-08 65° 80° 7647 5697 3936 2725 2043
09-09 61° 79° 7695 5735 3965 2746 2058
09-10 55° 80° 7741 5771 3990 2763 2070
09-11 62° 85° 7792 5813 4022 2787 2089
09-12 60° 74° 7838 5848 4047 2804 2101
09-13 51° 70° 7876 5876 4066 2814 2107
09-14 47° 63° 7909 5900 4079 2820 2107
09-15 56° 71° 7951 5931 4101 2834 2116
09-16 49° 75° 7991 5961 4121 2846 2123
09-17 58° 77° 8037 5997 4146 2863 2135
09-18 58° 66° 8077 6027 4166 2875 2142
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 58° 69° 8118 6058 4188 2888 2151
09-20 57° 68° 8159 6089 4208 2901 2158
09-21 55° 68° 8198 6118 4227 2912 2165
09-22 53° 70° 8238 6148 4247 2924 2171
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 15° 21° 0 0 0 0 0
02-16 -0° 13° 0 0 0 0 0
02-17 -13° -2° 0 0 0 0 0
02-18 -16° 4° 0 0 0 0 0
02-19 -12° 8° 0 0 0 0 0
02-20 1° 20° 0 0 0 0 0
02-21 2° 26° 0 0 0 0 0
02-22 11° 35° 1 0 0 0 0
02-23 30° 44° 16 5 0 0 0
02-24 41° 52° 40 19 4 0 0
02-25 29° 50° 58 27 4 0 0
02-26 37° 54° 81 40 8 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 34° 48° 100 49 8 0 0
02-28 26° 45° 114 53 8 0 0
03-01 12° 24° 114 53 8 0 0
03-02 13° 40° 119 53 8 0 0
03-03 29° 47° 135 59 8 0 0
03-04 32° 45° 151 66 8 0 0
03-05 24° 32° 157 66 8 0 0
03-06 14° 40° 162 66 8 0 0
03-07 21° 42° 172 66 8 0 0
03-08 29° 50° 189 73 8 0 0
03-09 32° 59° 213 87 11 0 0
03-10 35° 63° 240 104 18 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 28° 49° 257 110 18 0 0
03-12 32° 57° 279 123 21 0 0
03-13 31° 62° 303 137 25 0 0
03-14 49° 75° 344 167 45 12 7
03-15 28° 53° 362 176 45 12 7
03-16 19° 39° 369 176 45 12 7
03-17 31° 61° 393 190 49 12 7
03-18 33° 48° 411 198 49 12 7
03-19 33° 38° 425 202 49 12 7
03-20 26° 46° 439 206 49 12 7
03-21 31° 50° 457 214 49 12 7
03-22 16° 41° 464 214 49 12 7
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 30° 45° 480 220 49 12 7
03-24 24° 46° 492 223 49 12 7
03-25 26° 52° 510 230 49 12 7
03-26 30° 54° 530 240 49 12 7
03-27 40° 61° 558 259 58 13 7
03-28 44° 69° 593 283 72 19 9
03-29 33° 41° 608 288 72 19 9
03-30 30° 34° 618 288 72 19 9
03-31 25° 44° 630 290 72 19 9
04-01 31° 38° 643 293 72 19 9
04-02 32° 37° 655 295 72 19 9
04-03 33° 44° 672 302 72 19 9
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 28° 50° 689 309 72 19 9
04-05 31° 43° 704 314 72 19 9
04-06 27° 58° 724 325 73 19 9
04-07 26° 43° 737 327 73 19 9
04-08 21° 49° 750 330 73 19 9
04-09 37° 61° 776 347 80 19 9
04-10 40° 51° 800 360 83 19 9
04-11 38° 55° 825 375 88 19 9
04-12 38° 67° 855 396 99 22 9
04-13 52° 65° 892 422 115 30 12
04-14 41° 59° 920 440 123 30 12
04-15 37° 53° 943 453 126 30 12
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 32° 58° 966 466 129 30 12
04-17 47° 72° 1004 494 147 40 17
04-18 45° 57° 1033 513 156 41 17
04-19 33° 53° 1054 524 157 41 17
04-20 35° 55° 1077 537 160 41 17
04-21 37° 60° 1103 554 167 41 17
04-22 48° 69° 1140 580 183 50 20
04-23 47° 68° 1175 606 199 57 23
04-24 45° 51° 1201 621 204 57 23
04-25 42° 56° 1228 638 211 57 23
04-26 35° 63° 1255 655 218 57 23
04-27 49° 64° 1289 680 233 64 25
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 57° 70° 1331 711 254 78 33
04-29 42° 58° 1359 730 263 78 33
04-30 38° 69° 1391 751 274 81 33
05-01 52° 64° 1427 777 290 90 36
05-02 44° 52° 1453 793 296 90 36
05-03 42° 65° 1485 815 308 93 36
05-04 45° 79° 1525 845 328 106 44
05-05 53° 75° 1567 878 351 120 53
05-06 49° 82° 1611 911 374 135 63
05-07 53° 70° 1650 941 394 147 70
05-08 43° 70° 1685 965 408 154 72
05-09 45° 84° 1727 998 431 168 81
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 52° 74° 1768 1029 452 181 89
05-11 57° 89° 1819 1069 482 203 107
05-12 58° 86° 1869 1109 512 225 124
05-13 61° 86° 1920 1151 544 249 142
05-14 63° 84° 1972 1192 575 272 161
05-15 59° 78° 2018 1229 602 291 174
05-16 50° 60° 2051 1252 615 296 174
05-17 45° 51° 2077 1268 621 296 174
05-18 42° 55° 2104 1284 627 296 174
05-19 38° 58° 2130 1301 634 296 174
05-20 42° 48° 2153 1314 637 296 174
05-21 44° 49° 2178 1328 641 296 174
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 40° 64° 2208 1348 651 298 174
05-23 42° 63° 2238 1369 662 300 174
05-24 43° 65° 2270 1391 674 305 174
05-25 43° 68° 2304 1414 687 310 175
05-26 45° 71° 2340 1441 704 318 178
05-27 56° 63° 2377 1468 721 328 182
05-28 53° 59° 2412 1492 735 334 183
05-29 54° 71° 2452 1523 756 346 191
05-30 54° 77° 2496 1556 779 362 201
05-31 56° 77° 2540 1590 803 378 213
06-01 51° 79° 2583 1624 827 394 223
06-02 63° 90° 2638 1668 861 420 245
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 54° 70° 2678 1698 881 432 252
06-04 50° 76° 2719 1729 902 445 259
06-05 51° 78° 2761 1762 925 459 269
06-06 60° 71° 2805 1795 948 475 279
06-07 57° 75° 2849 1829 972 491 290
06-08 58° 70° 2891 1861 994 505 299
06-09 51° 66° 2927 1887 1010 513 303
06-10 58° 80° 2974 1924 1037 532 317
06-11 61° 71° 3018 1959 1062 548 328
06-12 57° 70° 3060 1990 1083 562 336
06-13 52° 59° 3093 2013 1096 567 337
06-14 53° 62° 3129 2039 1112 575 339
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 58° 73° 3172 2072 1135 590 350
06-16 64° 79° 3222 2112 1165 612 366
06-17 61° 79° 3270 2150 1193 632 382
06-18 61° 81° 3319 2189 1222 653 397
06-19 60° 86° 3369 2230 1253 675 415
06-20 69° 83° 3423 2274 1287 701 436
06-21 79° 94° 3488 2328 1331 738 468
06-22 81° 93° 3553 2384 1377 775 500
06-23 71° 87° 3611 2431 1414 805 524
06-24 61° 78° 3658 2469 1442 824 539
06-25 63° 70° 3703 2503 1466 841 551
06-26 61° 65° 3744 2534 1487 854 559
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 58° 71° 3786 2567 1510 869 568
06-28 61° 82° 3836 2606 1539 890 584
06-29 67° 81° 3888 2648 1571 914 603
06-30 63° 80° 3937 2687 1600 935 619
07-01 63° 84° 3988 2729 1632 958 638
07-02 65° 88° 4043 2773 1666 985 659
07-03 69° 89° 4100 2820 1703 1014 683
07-04 78° 92° 4163 2873 1746 1049 714
07-05 72° 82° 4218 2918 1781 1076 735
07-06 66° 83° 4270 2961 1814 1101 755
07-07 61° 84° 4321 3001 1844 1123 772
07-08 64° 83° 4372 3043 1876 1146 791
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 63° 83° 4424 3084 1907 1170 809
07-10 69° 80° 4476 3127 1940 1194 829
07-11 67° 84° 4530 3170 1973 1220 850
07-12 67° 78° 4580 3211 2004 1242 867
07-13 61° 86° 4632 3252 2035 1266 885
07-14 68° 89° 4689 3299 2072 1295 909
07-15 72° 92° 4749 3349 2112 1327 937
07-16 56° 71° 4790 3381 2134 1340 945
07-17 50° 72° 4829 3410 2153 1351 951
07-18 56° 73° 4872 3442 2175 1366 961
07-19 65° 76° 4921 3481 2204 1387 976
07-20 57° 79° 4967 3517 2230 1405 990
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 62° 79° 5016 3556 2259 1426 1005
07-22 73° 87° 5074 3604 2297 1456 1030
07-23 70° 80° 5127 3647 2330 1481 1050
07-24 69° 83° 5180 3691 2364 1507 1071
07-25 64° 84° 5232 3733 2396 1531 1090
07-26 68° 88° 5289 3779 2432 1559 1114
07-27 71° 90° 5348 3828 2471 1590 1139
07-28 66° 86° 5402 3872 2505 1616 1160
07-29 65° 83° 5454 3914 2537 1640 1180
07-30 68° 79° 5505 3956 2569 1663 1198
07-31 56° 76° 5549 3990 2593 1680 1209
08-01 59° 77° 5595 4026 2619 1697 1222
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 56° 78° 5640 4061 2644 1714 1234
08-03 59° 76° 5686 4096 2669 1732 1246
08-04 65° 76° 5734 4134 2697 1752 1262
08-05 60° 80° 5782 4173 2726 1772 1277
08-06 68° 81° 5835 4215 2758 1797 1296
08-07 67° 85° 5889 4259 2792 1823 1318
08-08 71° 87° 5946 4306 2829 1852 1342
08-09 69° 82° 5999 4350 2863 1877 1362
08-10 67° 82° 6051 4392 2895 1902 1381
08-11 61° 77° 6099 4429 2922 1921 1395
08-12 68° 80° 6151 4471 2954 1945 1414
08-13 60° 79° 6198 4508 2981 1964 1429
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 65° 76° 6247 4547 3010 1985 1445
08-15 69° 84° 6301 4592 3045 2011 1466
08-16 69° 82° 6354 4635 3078 2036 1486
08-17 69° 78° 6406 4676 3109 2060 1504
08-18 67° 77° 6455 4716 3139 2081 1521
08-19 68° 85° 6510 4760 3173 2108 1542
08-20 66° 80° 6561 4801 3204 2131 1560
08-21 64° 82° 6612 4842 3235 2154 1578
08-22 68° 77° 6662 4883 3266 2176 1596
08-23 58° 70° 6705 4915 3288 2191 1605
08-24 56° 65° 6743 4943 3306 2201 1611
08-25 50° 68° 6780 4970 3323 2210 1615
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 54° 74° 6822 5002 3345 2224 1623
08-27 54° 78° 6866 5036 3369 2240 1635
08-28 59° 78° 6912 5073 3396 2258 1648
08-29 60° 75° 6958 5108 3421 2276 1661
08-30 58° 76° 7003 5143 3446 2293 1673
08-31 53° 77° 7046 5176 3469 2308 1683
09-01 57° 79° 7092 5212 3495 2326 1695
09-02 59° 74° 7136 5246 3519 2342 1707
09-03 50° 66° 7172 5272 3535 2350 1710
09-04 44° 59° 7202 5292 3545 2352 1710
09-05 45° 58° 7231 5311 3554 2353 1710
09-06 44° 58° 7260 5330 3563 2354 1710
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 42° 63° 7290 5351 3574 2356 1710
09-08 46° 77° 7330 5381 3594 2368 1717
09-09 63° 68° 7374 5414 3617 2384 1727
09-10 61° 72° 7418 5449 3642 2400 1739
09-11 55° 76° 7462 5482 3665 2416 1749
09-12 61° 82° 7511 5521 3694 2437 1765
09-13 64° 82° 7562 5563 3726 2460 1784
09-14 67° 84° 7616 5606 3759 2486 1804
09-15 71° 80° 7669 5650 3793 2512 1825
09-16 68° 90° 7727 5697 3830 2541 1849
09-17 65° 81° 7778 5738 3861 2564 1867
09-18 64° 81° 7829 5779 3892 2587 1885
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 65° 74° 7876 5816 3919 2606 1899
09-20 63° 70° 7921 5851 3944 2623 1911
09-21 64° 76° 7968 5889 3972 2643 1926
09-22 58° 73° 8012 5922 3995 2658 1937
09-23 58° 73° 8056 5956 4019 2674 1947
09-24 55° 73° 8098 5988 4041 2688 1956
09-25 54° 80° 8143 6024 4067 2705 1969
09-26 56° 76° 8187 6058 4091 2721 1980
09-27 54° 72° 8228 6089 4112 2735 1988
09-28 47° 77° 8269 6119 4132 2747 1995
09-29 53° 85° 8316 6156 4159 2766 2009
09-30 64° 81° 8366 6196 4189 2788 2027
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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