Crabgrass/Annual Bluegrass Preemergence Timer (GDD 32)
through Fri, Mar. 13. 2026
“Flashback” to 2025
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Tabular Data
Daily GDD accumulation for various base temperature models in 2025 & 2026
| 2026 | Lo (F) | Hi (F) | GDD 22 | GDD 32 | GDD 42 | GDD 50 | GDD 55 |
|---|---|---|---|---|---|---|---|
| 02-15 | 30° | 59° | 23 | 13 | 3 | 0 | 0 |
| 02-16 | 31° | 65° | 49 | 29 | 9 | 0 | 0 |
| 02-17 | 38° | 58° | 75 | 45 | 15 | 0 | 0 |
| 02-18 | 44° | 66° | 108 | 68 | 28 | 5 | 0 |
| 02-19 | 37° | 55° | 132 | 82 | 32 | 5 | 0 |
| 02-20 | 28° | 48° | 148 | 88 | 32 | 5 | 0 |
| 02-21 | 25° | 30° | 154 | 88 | 32 | 5 | 0 |
| 02-22 | 21° | 27° | 156 | 88 | 32 | 5 | 0 |
| 02-23 | 19° | 26° | 156 | 88 | 32 | 5 | 0 |
| 02-24 | 17° | 37° | 161 | 88 | 32 | 5 | 0 |
| 02-25 | 27° | 40° | 173 | 90 | 32 | 5 | 0 |
| 02-26 | 25° | 43° | 185 | 92 | 32 | 5 | 0 |
| 2026 | Lo (F) | Hi (F) | GDD 22 | GDD 32 | GDD 42 | GDD 50 | GDD 55 |
| 02-27 | 25° | 65° | 208 | 105 | 35 | 5 | 0 |
| 02-28 | 29° | 50° | 225 | 112 | 35 | 5 | 0 |
| 03-01 | 26° | 37° | 235 | 112 | 35 | 5 | 0 |
| 03-02 | 27° | 47° | 251 | 118 | 35 | 5 | 0 |
| 03-03 | 34° | 42° | 267 | 124 | 35 | 5 | 0 |
| 03-04 | 35° | 44° | 284 | 131 | 35 | 5 | 0 |
| 03-05 | 43° | 53° | 309 | 147 | 41 | 5 | 0 |
| 03-06 | 48° | 77° | 350 | 177 | 61 | 18 | 8 |
| 03-07 | 39° | 63° | 379 | 196 | 70 | 19 | 8 |
| 03-08 | 34° | 63° | 405 | 212 | 77 | 19 | 8 |
| 03-09 | 45° | 72° | 442 | 239 | 93 | 28 | 11 |
| 03-10 | 56° | 65° | 480 | 268 | 112 | 38 | 17 |
| 2026 | Lo (F) | Hi (F) | GDD 22 | GDD 32 | GDD 42 | GDD 50 | GDD 55 |
| 03-11 | 36° | 66° | 509 | 286 | 121 | 39 | 17 |
| 03-12 | 29° | 46° | 525 | 292 | 121 | 39 | 17 |
| 03-13 | 39° | 50° | 547 | 304 | 123 | 39 | 17 |
| 03-14 | 30° | 44° | 562 | 309 | 123 | 39 | 17 |
| 03-15 | 39° | 67° | 593 | 330 | 134 | 42 | 17 |
| 03-16 | 26° | 28° | 598 | 330 | 134 | 42 | 17 |
| 03-17 | 12° | 26° | 598 | 330 | 134 | 42 | 17 |
| 03-18 | 19° | 44° | 608 | 330 | 134 | 42 | 17 |
| 03-19 | 31° | 55° | 629 | 341 | 135 | 42 | 17 |
| 03-20 | 36° | 53° | 651 | 354 | 137 | 42 | 17 |
| 2025 | Lo (F) | Hi (F) | GDD 22 | GDD 32 | GDD 42 | GDD 50 | GDD 55 |
|---|---|---|---|---|---|---|---|
| 02-15 | 26° | 36° | 9 | 0 | 0 | 0 | 0 |
| 02-16 | 16° | 30° | 10 | 0 | 0 | 0 | 0 |
| 02-17 | 3° | 14° | 10 | 0 | 0 | 0 | 0 |
| 02-18 | -4° | 14° | 10 | 0 | 0 | 0 | 0 |
| 02-19 | 7° | 20° | 10 | 0 | 0 | 0 | 0 |
| 02-20 | 1° | 23° | 10 | 0 | 0 | 0 | 0 |
| 02-21 | 8° | 31° | 10 | 0 | 0 | 0 | 0 |
| 02-22 | 11° | 37° | 12 | 0 | 0 | 0 | 0 |
| 02-23 | 21° | 48° | 25 | 2 | 0 | 0 | 0 |
| 02-24 | 34° | 56° | 47 | 15 | 3 | 0 | 0 |
| 02-25 | 33° | 56° | 70 | 28 | 6 | 0 | 0 |
| 02-26 | 32° | 50° | 89 | 37 | 6 | 0 | 0 |
| 2025 | Lo (F) | Hi (F) | GDD 22 | GDD 32 | GDD 42 | GDD 50 | GDD 55 |
| 02-27 | 33° | 51° | 109 | 47 | 6 | 0 | 0 |
| 02-28 | 31° | 60° | 133 | 61 | 9 | 0 | 0 |
| 03-01 | 19° | 39° | 139 | 61 | 9 | 0 | 0 |
| 03-02 | 14° | 36° | 142 | 61 | 9 | 0 | 0 |
| 03-03 | 28° | 43° | 156 | 64 | 9 | 0 | 0 |
| 03-04 | 41° | 47° | 178 | 76 | 11 | 0 | 0 |
| 03-05 | 29° | 51° | 195 | 84 | 11 | 0 | 0 |
| 03-06 | 26° | 39° | 206 | 84 | 11 | 0 | 0 |
| 03-07 | 30° | 37° | 218 | 86 | 11 | 0 | 0 |
| 03-08 | 30° | 48° | 235 | 93 | 11 | 0 | 0 |
| 03-09 | 31° | 57° | 256 | 105 | 13 | 0 | 0 |
| 03-10 | 35° | 67° | 285 | 124 | 22 | 1 | 0 |
| 2025 | Lo (F) | Hi (F) | GDD 22 | GDD 32 | GDD 42 | GDD 50 | GDD 55 |
| 03-11 | 35° | 54° | 308 | 136 | 24 | 1 | 0 |
| 03-12 | 33° | 62° | 333 | 151 | 30 | 1 | 0 |
| 03-13 | 31° | 68° | 361 | 169 | 37 | 1 | 0 |
| 03-14 | 43° | 78° | 399 | 198 | 56 | 12 | 6 |
| 03-15 | 50° | 68° | 437 | 225 | 73 | 21 | 10 |
| 03-16 | 30° | 45° | 452 | 230 | 73 | 21 | 10 |
| 03-17 | 24° | 52° | 468 | 236 | 73 | 21 | 10 |
| 03-18 | 42° | 72° | 503 | 261 | 89 | 28 | 13 |
| 03-19 | 39° | 68° | 535 | 283 | 101 | 32 | 13 |
| 03-20 | 31° | 41° | 549 | 287 | 101 | 32 | 13 |
| 03-21 | 27° | 58° | 569 | 297 | 101 | 32 | 13 |
| 03-22 | 35° | 48° | 589 | 307 | 101 | 32 | 13 |
| 2025 | Lo (F) | Hi (F) | GDD 22 | GDD 32 | GDD 42 | GDD 50 | GDD 55 |
| 03-23 | 32° | 47° | 606 | 315 | 101 | 32 | 13 |
| 03-24 | 34° | 50° | 626 | 325 | 101 | 32 | 13 |
| 03-25 | 30° | 51° | 645 | 333 | 101 | 32 | 13 |
| 03-26 | 29° | 52° | 663 | 342 | 101 | 32 | 13 |
| 03-27 | 39° | 55° | 689 | 357 | 106 | 32 | 13 |
| 03-28 | 48° | 81° | 731 | 389 | 128 | 46 | 22 |
| 03-29 | 58° | 66° | 771 | 419 | 149 | 58 | 29 |
| 03-30 | 49° | 77° | 812 | 450 | 169 | 71 | 37 |
| 03-31 | 33° | 46° | 830 | 458 | 169 | 71 | 37 |
| 04-01 | 29° | 49° | 847 | 465 | 169 | 71 | 37 |
| 04-02 | 40° | 66° | 878 | 486 | 180 | 74 | 37 |
| 04-03 | 44° | 63° | 910 | 508 | 192 | 78 | 37 |
| 2025 | Lo (F) | Hi (F) | GDD 22 | GDD 32 | GDD 42 | GDD 50 | GDD 55 |
| 04-04 | 39° | 51° | 932 | 520 | 195 | 78 | 37 |
| 04-05 | 42° | 48° | 955 | 533 | 198 | 78 | 37 |
| 04-06 | 38° | 46° | 975 | 543 | 198 | 78 | 37 |
| 04-07 | 31° | 44° | 991 | 549 | 198 | 78 | 37 |
| 04-08 | 28° | 42° | 1003 | 552 | 198 | 78 | 37 |
| 04-09 | 31° | 43° | 1018 | 557 | 198 | 78 | 37 |
| 04-10 | 36° | 49° | 1039 | 567 | 198 | 78 | 37 |
| 04-11 | 34° | 50° | 1059 | 577 | 199 | 78 | 37 |
| 04-12 | 31° | 60° | 1083 | 591 | 202 | 78 | 37 |
| 04-13 | 47° | 62° | 1115 | 614 | 215 | 83 | 37 |
| 04-14 | 51° | 63° | 1151 | 639 | 230 | 90 | 39 |
| 04-15 | 41° | 55° | 1177 | 655 | 236 | 90 | 39 |
| 2025 | Lo (F) | Hi (F) | GDD 22 | GDD 32 | GDD 42 | GDD 50 | GDD 55 |
| 04-16 | 33° | 53° | 1197 | 666 | 237 | 90 | 39 |
| 04-17 | 37° | 65° | 1226 | 684 | 245 | 91 | 39 |
| 04-18 | 54° | 80° | 1271 | 719 | 270 | 108 | 51 |
| 04-19 | 44° | 69° | 1306 | 744 | 285 | 114 | 53 |
| 04-20 | 47° | 67° | 1341 | 769 | 300 | 121 | 55 |
| 04-21 | 49° | 61° | 1374 | 792 | 313 | 126 | 55 |
| 04-22 | 39° | 73° | 1408 | 816 | 327 | 132 | 56 |
| 04-23 | 50° | 78° | 1450 | 848 | 349 | 147 | 65 |
| 04-24 | 49° | 81° | 1493 | 881 | 372 | 161 | 75 |
| 04-25 | 46° | 67° | 1527 | 905 | 387 | 168 | 76 |
| 04-26 | 42° | 53° | 1553 | 921 | 392 | 168 | 76 |
| 04-27 | 33° | 69° | 1582 | 940 | 401 | 169 | 76 |
| 2025 | Lo (F) | Hi (F) | GDD 22 | GDD 32 | GDD 42 | GDD 50 | GDD 55 |
| 04-28 | 49° | 82° | 1625 | 974 | 425 | 184 | 87 |
| 04-29 | 54° | 78° | 1669 | 1007 | 449 | 200 | 98 |
| 04-30 | 44° | 64° | 1702 | 1030 | 461 | 205 | 98 |
| 05-01 | 53° | 71° | 1742 | 1060 | 481 | 217 | 105 |
| 05-02 | 48° | 63° | 1775 | 1084 | 495 | 223 | 106 |
| 05-03 | 44° | 58° | 1804 | 1102 | 504 | 223 | 106 |
| 05-04 | 45° | 51° | 1830 | 1118 | 510 | 223 | 106 |
| 05-05 | 47° | 64° | 1864 | 1142 | 523 | 229 | 106 |
| 05-06 | 45° | 75° | 1902 | 1170 | 541 | 239 | 111 |
| 05-07 | 49° | 76° | 1942 | 1201 | 562 | 252 | 119 |
| 05-08 | 46° | 64° | 1975 | 1223 | 575 | 256 | 119 |
| 05-09 | 37° | 66° | 2005 | 1243 | 584 | 258 | 119 |
| 2025 | Lo (F) | Hi (F) | GDD 22 | GDD 32 | GDD 42 | GDD 50 | GDD 55 |
| 05-10 | 39° | 75° | 2040 | 1268 | 600 | 265 | 121 |
| 05-11 | 41° | 78° | 2078 | 1296 | 617 | 275 | 126 |
| 05-12 | 50° | 81° | 2121 | 1330 | 641 | 290 | 136 |
| 05-13 | 59° | 79° | 2169 | 1367 | 668 | 310 | 150 |
| 05-14 | 59° | 80° | 2216 | 1404 | 696 | 329 | 165 |
| 05-15 | 63° | 92° | 2272 | 1450 | 731 | 357 | 188 |
| 05-16 | 61° | 87° | 2324 | 1493 | 764 | 381 | 207 |
| 05-17 | 56° | 70° | 2365 | 1523 | 785 | 394 | 215 |
| 05-18 | 50° | 66° | 2401 | 1550 | 801 | 403 | 218 |
| 05-19 | 47° | 63° | 2434 | 1573 | 814 | 408 | 218 |
| 05-20 | 49° | 60° | 2467 | 1595 | 826 | 412 | 218 |
| 05-21 | 50° | 56° | 2498 | 1616 | 837 | 415 | 218 |
| 2025 | Lo (F) | Hi (F) | GDD 22 | GDD 32 | GDD 42 | GDD 50 | GDD 55 |
| 05-22 | 46° | 56° | 2527 | 1635 | 846 | 416 | 218 |
| 05-23 | 38° | 65° | 2557 | 1655 | 856 | 418 | 218 |
| 05-24 | 42° | 68° | 2590 | 1678 | 869 | 423 | 219 |
| 05-25 | 53° | 66° | 2627 | 1705 | 887 | 432 | 223 |
| 05-26 | 44° | 73° | 2664 | 1732 | 903 | 441 | 226 |
| 05-27 | 55° | 74° | 2706 | 1764 | 925 | 455 | 235 |
| 05-28 | 53° | 62° | 2741 | 1790 | 941 | 462 | 238 |
| 05-29 | 49° | 69° | 2778 | 1816 | 958 | 471 | 242 |
| 05-30 | 52° | 75° | 2820 | 1848 | 979 | 485 | 250 |
| 05-31 | 48° | 66° | 2855 | 1873 | 995 | 492 | 253 |
| 06-01 | 40° | 71° | 2889 | 1897 | 1008 | 498 | 253 |
| 06-02 | 44° | 83° | 2930 | 1928 | 1030 | 511 | 262 |
| 2025 | Lo (F) | Hi (F) | GDD 22 | GDD 32 | GDD 42 | GDD 50 | GDD 55 |
| 06-03 | 63° | 89° | 2984 | 1972 | 1063 | 537 | 282 |
| 06-04 | 57° | 78° | 3029 | 2008 | 1089 | 554 | 295 |
| 06-05 | 56° | 66° | 3069 | 2037 | 1108 | 566 | 301 |
| 06-06 | 61° | 75° | 3115 | 2073 | 1134 | 584 | 314 |
| 06-07 | 57° | 78° | 3160 | 2108 | 1159 | 601 | 326 |
| 06-08 | 62° | 82° | 3210 | 2148 | 1189 | 623 | 343 |
| 06-09 | 54° | 76° | 3253 | 2181 | 1212 | 638 | 353 |
| 06-10 | 51° | 78° | 3295 | 2213 | 1235 | 652 | 363 |
| 06-11 | 58° | 88° | 3346 | 2254 | 1265 | 675 | 381 |
| 06-12 | 63° | 83° | 3397 | 2296 | 1297 | 698 | 399 |
| 06-13 | 66° | 73° | 3445 | 2333 | 1324 | 718 | 413 |
| 06-14 | 63° | 77° | 3493 | 2371 | 1352 | 738 | 428 |
| 2025 | Lo (F) | Hi (F) | GDD 22 | GDD 32 | GDD 42 | GDD 50 | GDD 55 |
| 06-15 | 60° | 82° | 3542 | 2410 | 1381 | 759 | 444 |
| 06-16 | 63° | 85° | 3594 | 2452 | 1413 | 783 | 463 |
| 06-17 | 68° | 90° | 3651 | 2499 | 1450 | 812 | 487 |
| 06-18 | 68° | 86° | 3706 | 2544 | 1485 | 839 | 509 |
| 06-19 | 65° | 82° | 3757 | 2585 | 1517 | 862 | 528 |
| 06-20 | 65° | 84° | 3809 | 2628 | 1549 | 886 | 547 |
| 06-21 | 73° | 92° | 3870 | 2678 | 1590 | 919 | 575 |
| 06-22 | 76° | 92° | 3933 | 2731 | 1632 | 954 | 604 |
| 06-23 | 75° | 93° | 3995 | 2783 | 1674 | 988 | 633 |
| 06-24 | 75° | 94° | 4057 | 2836 | 1717 | 1023 | 663 |
| 06-25 | 71° | 91° | 4116 | 2885 | 1756 | 1053 | 689 |
| 06-26 | 73° | 93° | 4177 | 2935 | 1797 | 1086 | 717 |
| 2025 | Lo (F) | Hi (F) | GDD 22 | GDD 32 | GDD 42 | GDD 50 | GDD 55 |
| 06-27 | 73° | 88° | 4236 | 2984 | 1835 | 1117 | 742 |
| 06-28 | 66° | 87° | 4291 | 3029 | 1870 | 1144 | 764 |
| 06-29 | 70° | 92° | 4349 | 3078 | 1909 | 1175 | 790 |
| 06-30 | 73° | 88° | 4408 | 3126 | 1947 | 1205 | 815 |
| 07-01 | 69° | 86° | 4463 | 3171 | 1982 | 1232 | 837 |
| 07-02 | 63° | 88° | 4517 | 3215 | 2016 | 1258 | 858 |
| 07-03 | 66° | 90° | 4573 | 3261 | 2052 | 1286 | 881 |
| 07-04 | 69° | 90° | 4630 | 3308 | 2090 | 1315 | 906 |
| 07-05 | 70° | 92° | 4689 | 3357 | 2128 | 1346 | 931 |
| 07-06 | 71° | 90° | 4748 | 3406 | 2167 | 1377 | 957 |
| 07-07 | 66° | 82° | 4799 | 3448 | 2199 | 1401 | 976 |
| 07-08 | 61° | 88° | 4852 | 3490 | 2231 | 1425 | 995 |
| 2025 | Lo (F) | Hi (F) | GDD 22 | GDD 32 | GDD 42 | GDD 50 | GDD 55 |
| 07-09 | 68° | 83° | 4905 | 3534 | 2265 | 1451 | 1016 |
| 07-10 | 64° | 88° | 4959 | 3578 | 2299 | 1476 | 1037 |
| 07-11 | 71° | 90° | 5018 | 3626 | 2337 | 1507 | 1063 |
| 07-12 | 72° | 84° | 5074 | 3672 | 2373 | 1535 | 1085 |
| 07-13 | 66° | 82° | 5126 | 3714 | 2406 | 1559 | 1105 |
| 07-14 | 61° | 85° | 5178 | 3756 | 2437 | 1583 | 1123 |
| 07-15 | 65° | 91° | 5234 | 3802 | 2473 | 1611 | 1146 |
| 07-16 | 72° | 91° | 5293 | 3851 | 2513 | 1642 | 1173 |
| 07-17 | 65° | 78° | 5343 | 3891 | 2542 | 1664 | 1189 |
| 07-18 | 61° | 83° | 5393 | 3931 | 2572 | 1686 | 1206 |
| 07-19 | 68° | 82° | 5446 | 3974 | 2605 | 1711 | 1226 |
| 07-20 | 68° | 78° | 5497 | 4015 | 2636 | 1734 | 1245 |
| 2025 | Lo (F) | Hi (F) | GDD 22 | GDD 32 | GDD 42 | GDD 50 | GDD 55 |
| 07-21 | 65° | 82° | 5549 | 4057 | 2668 | 1758 | 1263 |
| 07-22 | 64° | 83° | 5600 | 4098 | 2700 | 1781 | 1282 |
| 07-23 | 66° | 91° | 5657 | 4145 | 2736 | 1810 | 1305 |
| 07-24 | 74° | 95° | 5719 | 4197 | 2778 | 1844 | 1335 |
| 07-25 | 71° | 82° | 5774 | 4242 | 2813 | 1871 | 1356 |
| 07-26 | 70° | 80° | 5827 | 4285 | 2846 | 1896 | 1376 |
| 07-27 | 72° | 87° | 5885 | 4333 | 2884 | 1926 | 1401 |
| 07-28 | 75° | 90° | 5945 | 4383 | 2924 | 1958 | 1428 |
| 07-29 | 67° | 91° | 6002 | 4430 | 2962 | 1987 | 1453 |
| 07-30 | 70° | 85° | 6058 | 4476 | 2997 | 2015 | 1475 |
| 07-31 | 62° | 76° | 6105 | 4513 | 3024 | 2034 | 1489 |
| 08-01 | 57° | 77° | 6150 | 4548 | 3049 | 2051 | 1501 |
| 2025 | Lo (F) | Hi (F) | GDD 22 | GDD 32 | GDD 42 | GDD 50 | GDD 55 |
| 08-02 | 54° | 77° | 6193 | 4582 | 3073 | 2067 | 1512 |
| 08-03 | 55° | 78° | 6238 | 4616 | 3097 | 2083 | 1523 |
| 08-04 | 58° | 81° | 6285 | 4653 | 3125 | 2102 | 1538 |
| 08-05 | 58° | 83° | 6334 | 4692 | 3153 | 2123 | 1553 |
| 08-06 | 59° | 85° | 6384 | 4732 | 3183 | 2145 | 1570 |
| 08-07 | 68° | 88° | 6440 | 4778 | 3219 | 2173 | 1593 |
| 08-08 | 71° | 89° | 6498 | 4826 | 3257 | 2203 | 1618 |
| 08-09 | 69° | 90° | 6555 | 4873 | 3294 | 2232 | 1642 |
| 08-10 | 71° | 90° | 6613 | 4922 | 3333 | 2262 | 1668 |
| 08-11 | 71° | 85° | 6670 | 4968 | 3369 | 2291 | 1691 |
| 08-12 | 71° | 89° | 6728 | 5016 | 3407 | 2321 | 1716 |
| 08-13 | 67° | 85° | 6782 | 5060 | 3441 | 2347 | 1737 |
| 2025 | Lo (F) | Hi (F) | GDD 22 | GDD 32 | GDD 42 | GDD 50 | GDD 55 |
| 08-14 | 61° | 84° | 6833 | 5101 | 3472 | 2370 | 1755 |
| 08-15 | 65° | 90° | 6888 | 5146 | 3507 | 2397 | 1777 |
| 08-16 | 74° | 93° | 6949 | 5197 | 3549 | 2430 | 1806 |
| 08-17 | 70° | 85° | 7005 | 5243 | 3584 | 2458 | 1828 |
| 08-18 | 69° | 84° | 7059 | 5287 | 3619 | 2484 | 1850 |
| 08-19 | 70° | 81° | 7113 | 5331 | 3652 | 2510 | 1870 |
| 08-20 | 67° | 75° | 7162 | 5370 | 3681 | 2531 | 1886 |
| 08-21 | 59° | 77° | 7208 | 5406 | 3707 | 2549 | 1899 |
| 08-22 | 58° | 78° | 7253 | 5442 | 3733 | 2567 | 1912 |
| 08-23 | 63° | 84° | 7305 | 5483 | 3764 | 2590 | 1930 |
| 08-24 | 55° | 73° | 7347 | 5515 | 3786 | 2604 | 1939 |
| 08-25 | 52° | 68° | 7385 | 5543 | 3805 | 2614 | 1945 |
| 2025 | Lo (F) | Hi (F) | GDD 22 | GDD 32 | GDD 42 | GDD 50 | GDD 55 |
| 08-26 | 49° | 71° | 7423 | 5572 | 3823 | 2624 | 1950 |
| 08-27 | 48° | 74° | 7463 | 5601 | 3842 | 2636 | 1956 |
| 08-28 | 59° | 76° | 7508 | 5636 | 3867 | 2653 | 1969 |
| 08-29 | 49° | 71° | 7546 | 5665 | 3886 | 2663 | 1974 |
| 08-30 | 55° | 74° | 7589 | 5697 | 3908 | 2678 | 1983 |
| 08-31 | 51° | 76° | 7630 | 5728 | 3930 | 2691 | 1992 |
| 09-01 | 51° | 78° | 7672 | 5761 | 3952 | 2705 | 2001 |
| 09-02 | 53° | 80° | 7717 | 5795 | 3976 | 2722 | 2012 |
| 09-03 | 54° | 77° | 7760 | 5828 | 4000 | 2737 | 2023 |
| 09-04 | 49° | 65° | 7795 | 5853 | 4014 | 2744 | 2025 |
| 09-05 | 53° | 68° | 7834 | 5882 | 4033 | 2755 | 2030 |
| 09-06 | 44° | 66° | 7866 | 5905 | 4046 | 2759 | 2030 |
| 2025 | Lo (F) | Hi (F) | GDD 22 | GDD 32 | GDD 42 | GDD 50 | GDD 55 |
| 09-07 | 42° | 68° | 7899 | 5927 | 4058 | 2764 | 2030 |
| 09-08 | 39° | 71° | 7932 | 5950 | 4071 | 2769 | 2030 |
| 09-09 | 42° | 75° | 7969 | 5977 | 4088 | 2778 | 2034 |
| 09-10 | 56° | 82° | 8016 | 6014 | 4115 | 2797 | 2048 |
| 09-11 | 59° | 83° | 8064 | 6053 | 4144 | 2817 | 2064 |
| 09-12 | 53° | 84° | 8111 | 6089 | 4170 | 2836 | 2077 |
| 09-13 | 60° | 74° | 8156 | 6124 | 4195 | 2853 | 2089 |
| 09-14 | 60° | 85° | 8207 | 6165 | 4226 | 2876 | 2107 |
| 09-15 | 58° | 85° | 8257 | 6205 | 4256 | 2898 | 2124 |
| 09-16 | 56° | 82° | 8304 | 6242 | 4283 | 2917 | 2138 |
| 09-17 | 55° | 85° | 8351 | 6280 | 4311 | 2936 | 2153 |
| 09-18 | 55° | 87° | 8400 | 6318 | 4340 | 2957 | 2168 |
| 2025 | Lo (F) | Hi (F) | GDD 22 | GDD 32 | GDD 42 | GDD 50 | GDD 55 |
| 09-19 | 58° | 88° | 8452 | 6360 | 4371 | 2981 | 2187 |
| 09-20 | 64° | 79° | 8501 | 6399 | 4400 | 3002 | 2203 |
| 09-21 | 64° | 83° | 8553 | 6441 | 4432 | 3026 | 2222 |
| 09-22 | 64° | 79° | 8602 | 6480 | 4461 | 3047 | 2238 |
| 09-23 | 62° | 76° | 8649 | 6517 | 4488 | 3066 | 2252 |
| 09-24 | 62° | 72° | 8694 | 6552 | 4514 | 3083 | 2264 |
| 09-25 | 59° | 73° | 8738 | 6586 | 4537 | 3099 | 2275 |
| 09-26 | 52° | 81° | 8782 | 6621 | 4562 | 3116 | 2287 |
| 09-27 | 56° | 86° | 8831 | 6660 | 4591 | 3136 | 2303 |
| 09-28 | 56° | 86° | 8880 | 6699 | 4620 | 3157 | 2319 |
| 09-29 | 56° | 89° | 8931 | 6739 | 4650 | 3180 | 2336 |
| 09-30 | 56° | 84° | 8979 | 6777 | 4678 | 3200 | 2351 |
| 2025 | Lo (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.