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 Mon, Aug. 10. 2026

 
  

Marine On Saint, 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 23° 51° 15 5 0 0 0
02-16 31° 53° 35 15 0 0 0
02-17 30° 48° 53 23 0 0 0
02-18 28° 41° 65 25 0 0 0
02-19 30° 35° 76 26 0 0 0
02-20 22° 30° 79 26 0 0 0
02-21 12° 23° 79 26 0 0 0
02-22 8° 16° 79 26 0 0 0
02-23 2° 23° 79 26 0 0 0
02-24 18° 37° 85 26 0 0 0
02-25 10° 24° 85 26 0 0 0
02-26 15° 44° 92 26 0 0 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 25° 52° 109 32 0 0 0
02-28 16° 23° 109 32 0 0 0
03-01 12° 28° 109 32 0 0 0
03-02 21° 42° 118 32 0 0 0
03-03 34° 52° 139 43 1 0 0
03-04 30° 49° 157 51 1 0 0
03-05 32° 50° 176 60 1 0 0
03-06 42° 49° 200 74 5 0 0
03-07 28° 40° 211 75 5 0 0
03-08 34° 57° 235 89 8 0 0
03-09 40° 54° 260 104 13 0 0
03-10 31° 40° 273 107 13 0 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 27° 39° 284 108 13 0 0
03-12 20° 39° 292 108 13 0 0
03-13 23° 39° 302 108 13 0 0
03-14 18° 33° 305 108 13 0 0
03-15 26° 31° 311 108 13 0 0
03-16 8° 23° 311 108 13 0 0
03-17 -1° 18° 311 108 13 0 0
03-18 17° 44° 320 108 13 0 0
03-19 29° 52° 339 117 13 0 0
03-20 42° 60° 368 136 22 1 0
03-21 38° 77° 404 162 38 9 3
03-22 33° 48° 423 171 38 9 3
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 23° 45° 435 173 38 9 3
03-24 35° 54° 457 186 41 9 3
03-25 41° 72° 492 210 55 16 5
03-26 30° 56° 513 222 57 16 5
03-27 23° 35° 520 222 57 16 5
03-28 17° 54° 534 225 57 16 5
03-29 41° 68° 567 248 69 20 5
03-30 36° 70° 598 269 80 23 5
03-31 34° 52° 619 280 81 23 5
04-01 30° 43° 633 284 81 23 5
04-02 31° 38° 646 287 81 23 5
04-03 30° 38° 658 289 81 23 5
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 33° 37° 671 292 81 23 5
04-05 31° 52° 690 302 81 23 5
04-06 28° 41° 703 304 81 23 5
04-07 16° 43° 710 304 81 23 5
04-08 37° 59° 736 320 87 23 5
04-09 35° 47° 756 329 87 23 5
04-10 33° 54° 777 340 89 23 5
04-11 31° 48° 794 347 89 23 5
04-12 47° 78° 834 378 109 35 12
04-13 49° 66° 870 403 124 43 14
04-14 49° 61° 902 426 137 48 14
04-15 40° 66° 933 447 148 50 14
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 40° 77° 970 474 165 59 18
04-17 40° 66° 1001 495 176 62 18
04-18 30° 44° 1016 500 176 62 18
04-19 30° 45° 1032 505 176 62 18
04-20 24° 60° 1052 516 176 62 18
04-21 39° 74° 1087 540 191 69 20
04-22 45° 81° 1128 571 212 82 28
04-23 61° 72° 1172 606 236 98 39
04-24 42° 64° 1203 626 247 101 39
04-25 42° 58° 1230 644 254 101 39
04-26 44° 63° 1262 666 266 105 39
04-27 45° 56° 1291 684 275 105 39
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 41° 56° 1317 701 281 105 39
04-29 38° 51° 1339 713 283 105 39
04-30 31° 49° 1357 721 283 105 39
05-01 37° 53° 1380 734 286 105 39
05-02 33° 64° 1407 751 293 105 39
05-03 48° 69° 1444 777 309 114 43
05-04 45° 61° 1475 798 321 117 43
05-05 36° 49° 1496 809 321 117 43
05-06 32° 44° 1512 815 321 117 43
05-07 32° 57° 1534 828 324 117 43
05-08 36° 69° 1565 848 334 120 43
05-09 47° 59° 1596 869 345 123 43
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 37° 57° 1621 884 350 123 43
05-11 33° 65° 1648 901 357 123 43
05-12 55° 69° 1688 931 377 135 50
05-13 42° 70° 1722 955 391 141 51
05-14 47° 77° 1762 985 411 153 58
05-15 57° 85° 1811 1025 441 174 74
05-16 52° 77° 1853 1057 463 189 83
05-17 52° 66° 1891 1084 480 198 88
05-18 54° 62° 1927 1110 496 206 91
05-19 48° 58° 1958 1131 507 209 91
05-20 35° 59° 1983 1147 513 209 91
05-21 42° 63° 2014 1167 523 212 91
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 49° 65° 2049 1192 538 219 93
05-23 52° 66° 2086 1220 556 228 97
05-24 45° 81° 2127 1251 577 241 105
05-25 60° 83° 2177 1290 606 263 122
05-26 65° 84° 2229 1333 639 287 142
05-27 61° 89° 2283 1376 672 313 162
05-28 59° 82° 2331 1415 701 333 177
05-29 60° 85° 2381 1455 731 355 195
05-30 63° 80° 2431 1495 761 377 211
05-31 60° 74° 2476 1530 786 394 223
06-01 62° 77° 2524 1568 814 414 238
06-02 55° 81° 2570 1604 840 432 251
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 61° 83° 2620 1643 869 454 268
06-04 66° 82° 2672 1686 902 478 287
06-05 63° 78° 2721 1724 930 499 303
06-06 59° 84° 2771 1764 960 521 320
06-07 64° 85° 2823 1807 993 545 339
06-08 67° 80° 2875 1848 1024 569 358
06-09 67° 86° 2929 1893 1059 595 379
06-10 69° 87° 2985 1939 1095 623 402
06-11 57° 72° 3028 1971 1117 638 412
06-12 57° 78° 3073 2007 1143 655 424
06-13 60° 72° 3117 2041 1167 671 435
06-14 54° 72° 3158 2072 1188 684 443
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 47° 77° 3198 2102 1208 696 451
06-16 54° 71° 3239 2133 1229 709 458
06-17 55° 63° 3277 2160 1246 719 463
06-18 53° 69° 3316 2190 1266 730 469
06-19 47° 72° 3353 2217 1283 739 473
06-20 52° 73° 3393 2247 1303 751 480
06-21 50° 73° 3433 2277 1323 763 487
06-22 51° 75° 3474 2308 1344 776 495
06-23 56° 75° 3518 2342 1368 792 506
06-24 60° 76° 3564 2377 1393 810 519
06-25 57° 71° 3606 2409 1415 824 528
06-26 53° 77° 3649 2442 1438 839 538
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 60° 80° 3697 2480 1466 859 553
06-28 65° 79° 3747 2520 1496 881 570
06-29 74° 92° 3808 2572 1538 914 598
06-30 74° 89° 3868 2621 1577 946 625
07-01 65° 82° 3919 2663 1609 969 643
07-02 66° 81° 3971 2705 1641 993 662
07-03 69° 84° 4025 2749 1675 1019 683
07-04 65° 84° 4078 2792 1708 1044 703
07-05 64° 85° 4130 2834 1740 1068 722
07-06 67° 85° 4184 2878 1774 1094 743
07-07 66° 81° 4236 2919 1805 1118 762
07-08 69° 80° 4289 2962 1838 1143 782
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 64° 83° 4340 3003 1869 1166 800
07-10 62° 86° 4392 3045 1901 1190 819
07-11 67° 88° 4447 3091 1937 1217 841
07-12 72° 89° 4506 3139 1975 1248 867
07-13 71° 93° 4566 3189 2015 1280 894
07-14 70° 94° 4625 3239 2055 1311 920
07-15 71° 92° 4685 3288 2094 1343 947
07-16 66° 89° 4740 3334 2130 1370 970
07-17 73° 94° 4802 3385 2171 1404 998
07-18 67° 85° 4856 3429 2205 1430 1019
07-19 65° 88° 4910 3474 2240 1456 1040
07-20 69° 90° 4968 3521 2277 1486 1065
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 64° 76° 5016 3560 2306 1506 1080
07-22 55° 71° 5057 3590 2326 1519 1088
07-23 51° 79° 5100 3623 2349 1534 1098
07-24 64° 80° 5150 3663 2379 1556 1115
07-25 70° 84° 5205 3708 2414 1583 1137
07-26 71° 97° 5267 3760 2456 1617 1166
07-27 74° 94° 5329 3812 2498 1651 1195
07-28 65° 84° 5381 3855 2531 1675 1214
07-29 66° 91° 5437 3901 2567 1703 1238
07-30 71° 88° 5495 3949 2605 1733 1262
07-31 65° 76° 5544 3987 2633 1754 1278
08-01 64° 84° 5596 4029 2665 1778 1297
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 60° 83° 5645 4069 2695 1799 1313
08-03 64° 84° 5698 4111 2727 1824 1333
08-04 61° 75° 5744 4147 2753 1842 1346
08-05 55° 79° 5789 4182 2778 1859 1358
08-06 56° 81° 5835 4219 2805 1877 1371
08-07 64° 75° 5883 4257 2833 1897 1386
08-08 54° 81° 5929 4292 2858 1915 1399
08-09 65° 81° 5980 4333 2889 1938 1417
08-10 65° 83° 6032 4375 2921 1962 1436
08-11 63° 86° 6084 4418 2954 1986 1456
08-12 63° 83° 6136 4459 2985 2010 1474
08-13 62° 79° 6184 4498 3014 2030 1489
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 58° 77° 6230 4534 3040 2048 1502
08-15 59° 73° 6274 4568 3064 2064 1513
08-16 59° 76° 6320 4603 3089 2082 1526
08-17 57° 77° 6365 4638 3114 2099 1538
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 15° 22° 0 0 0 0 0
02-16 -1° 14° 0 0 0 0 0
02-17 -15° -2° 0 0 0 0 0
02-18 -19° 4° 0 0 0 0 0
02-19 -14° 8° 0 0 0 0 0
02-20 1° 20° 0 0 0 0 0
02-21 -4° 25° 0 0 0 0 0
02-22 8° 34° 0 0 0 0 0
02-23 31° 42° 15 5 0 0 0
02-24 41° 52° 39 19 4 0 0
02-25 29° 49° 57 27 4 0 0
02-26 36° 53° 79 39 7 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 34° 47° 98 48 7 0 0
02-28 25° 45° 111 51 7 0 0
03-01 11° 24° 111 51 7 0 0
03-02 12° 39° 114 51 7 0 0
03-03 29° 47° 130 56 7 0 0
03-04 32° 42° 145 62 7 0 0
03-05 24° 32° 151 62 7 0 0
03-06 12° 39° 154 62 7 0 0
03-07 17° 41° 161 62 7 0 0
03-08 26° 49° 177 67 7 0 0
03-09 31° 58° 199 80 10 0 0
03-10 34° 64° 226 97 17 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 27° 48° 242 102 17 0 0
03-12 31° 54° 263 113 17 0 0
03-13 29° 62° 286 127 21 0 0
03-14 48° 74° 326 156 40 11 6
03-15 29° 55° 346 166 40 11 6
03-16 19° 37° 352 166 40 11 6
03-17 30° 60° 375 179 43 11 6
03-18 32° 47° 392 186 43 11 6
03-19 33° 38° 406 189 43 11 6
03-20 25° 46° 419 193 43 11 6
03-21 31° 49° 437 201 43 11 6
03-22 15° 40° 443 201 43 11 6
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 29° 46° 458 206 43 11 6
03-24 25° 45° 471 209 43 11 6
03-25 24° 52° 487 215 43 11 6
03-26 29° 53° 506 224 43 11 6
03-27 39° 59° 533 241 50 11 6
03-28 41° 58° 560 258 58 11 6
03-29 33° 39° 574 262 58 11 6
03-30 30° 33° 584 262 58 11 6
03-31 22° 42° 595 263 58 11 6
04-01 31° 40° 608 266 58 11 6
04-02 31° 37° 620 268 58 11 6
04-03 34° 44° 637 275 58 11 6
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 27° 51° 654 282 58 11 6
04-05 31° 43° 669 287 58 11 6
04-06 25° 57° 688 296 58 11 6
04-07 26° 41° 699 298 58 11 6
04-08 17° 47° 709 298 58 11 6
04-09 36° 60° 735 313 64 11 6
04-10 39° 48° 757 325 65 11 6
04-11 37° 55° 780 339 69 11 6
04-12 37° 65° 809 358 78 12 6
04-13 51° 65° 845 383 93 20 9
04-14 41° 59° 873 401 101 20 9
04-15 37° 52° 895 414 104 20 9
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 31° 56° 917 425 105 20 9
04-17 46° 68° 952 450 120 27 11
04-18 44° 56° 980 469 129 28 11
04-19 32° 52° 1001 479 129 28 11
04-20 33° 54° 1022 491 131 28 11
04-21 36° 60° 1048 506 137 28 11
04-22 45° 67° 1082 531 151 34 13
04-23 45° 68° 1117 555 165 40 14
04-24 43° 50° 1141 569 170 40 14
04-25 42° 55° 1168 586 176 40 14
04-26 33° 63° 1193 602 182 40 14
04-27 49° 65° 1229 627 197 47 16
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 57° 70° 1270 658 218 61 24
04-29 41° 57° 1297 675 225 61 24
04-30 36° 68° 1327 696 236 63 24
05-01 52° 64° 1363 721 252 71 27
05-02 43° 51° 1388 737 257 71 27
05-03 42° 64° 1420 758 268 74 27
05-04 44° 80° 1459 788 288 86 34
05-05 52° 76° 1501 820 310 100 43
05-06 47° 82° 1544 852 332 114 52
05-07 53° 70° 1583 881 351 125 58
05-08 41° 70° 1616 905 365 131 59
05-09 43° 82° 1657 935 386 143 67
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 50° 73° 1697 965 405 155 74
05-11 55° 88° 1746 1005 435 177 90
05-12 57° 86° 1796 1044 464 198 106
05-13 60° 86° 1846 1085 495 221 124
05-14 62° 82° 1897 1125 525 243 142
05-15 59° 78° 1944 1162 552 262 155
05-16 50° 59° 1976 1184 565 266 155
05-17 45° 52° 2002 1201 571 266 155
05-18 39° 54° 2027 1215 575 266 155
05-19 37° 58° 2053 1231 581 266 155
05-20 42° 48° 2076 1244 584 266 155
05-21 43° 50° 2100 1259 589 266 155
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 39° 65° 2130 1279 599 268 155
05-23 40° 62° 2159 1298 608 269 155
05-24 41° 65° 2190 1319 619 272 155
05-25 40° 69° 2223 1341 631 277 155
05-26 43° 71° 2258 1366 646 284 157
05-27 53° 64° 2294 1393 663 292 161
05-28 52° 60° 2329 1417 677 299 162
05-29 54° 71° 2369 1448 698 311 170
05-30 53° 77° 2412 1481 721 326 180
05-31 53° 77° 2456 1514 744 342 190
06-01 48° 79° 2497 1545 765 355 199
06-02 62° 90° 2551 1589 799 381 220
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 54° 67° 2590 1618 818 392 225
06-04 47° 76° 2629 1647 838 403 232
06-05 49° 78° 2671 1679 859 417 240
06-06 59° 71° 2714 1712 882 432 251
06-07 56° 74° 2757 1745 905 447 261
06-08 57° 70° 2799 1777 927 461 269
06-09 51° 66° 2835 1803 943 469 273
06-10 57° 78° 2880 1839 969 486 285
06-11 60° 73° 2925 1873 994 503 297
06-12 57° 71° 2967 1905 1015 517 305
06-13 52° 59° 3000 1928 1028 522 306
06-14 53° 62° 3035 1954 1044 529 308
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 58° 71° 3078 1986 1066 544 318
06-16 63° 78° 3127 2025 1095 565 333
06-17 60° 78° 3174 2062 1122 584 348
06-18 60° 81° 3222 2101 1151 604 363
06-19 59° 84° 3272 2140 1181 626 380
06-20 68° 83° 3325 2184 1214 651 400
06-21 77° 93° 3389 2237 1257 687 430
06-22 82° 92° 3454 2292 1302 724 462
06-23 70° 87° 3510 2338 1338 752 485
06-24 59° 79° 3557 2375 1365 771 500
06-25 63° 70° 3601 2410 1390 787 511
06-26 60° 65° 3642 2440 1410 800 519
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 57° 70° 3684 2472 1432 814 528
06-28 61° 83° 3734 2512 1462 836 544
06-29 66° 81° 3785 2554 1494 859 563
06-30 63° 80° 3834 2593 1523 880 579
07-01 62° 83° 3885 2633 1553 903 597
07-02 63° 87° 3938 2676 1586 928 617
07-03 66° 88° 3993 2721 1622 955 639
07-04 75° 91° 4054 2772 1662 988 667
07-05 72° 81° 4108 2817 1697 1014 688
07-06 65° 82° 4160 2858 1729 1038 707
07-07 59° 83° 4209 2897 1758 1059 723
07-08 62° 82° 4259 2938 1788 1081 740
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 62° 82° 4309 2977 1818 1103 757
07-10 67° 81° 4361 3019 1849 1127 776
07-11 66° 83° 4413 3062 1882 1151 795
07-12 66° 77° 4463 3101 1911 1173 811
07-13 60° 85° 4513 3142 1942 1195 829
07-14 67° 89° 4569 3188 1978 1223 852
07-15 72° 92° 4630 3238 2018 1256 879
07-16 56° 71° 4671 3269 2039 1269 888
07-17 50° 72° 4710 3298 2058 1280 894
07-18 54° 73° 4752 3330 2080 1294 902
07-19 64° 75° 4799 3368 2108 1313 917
07-20 56° 79° 4845 3404 2134 1331 930
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 63° 78° 4894 3442 2162 1352 945
07-22 72° 87° 4951 3489 2200 1381 970
07-23 71° 79° 5004 3533 2233 1406 990
07-24 68° 82° 5057 3576 2266 1431 1010
07-25 63° 84° 5109 3617 2297 1455 1028
07-26 68° 88° 5164 3663 2333 1482 1051
07-27 71° 89° 5222 3711 2371 1512 1076
07-28 65° 86° 5276 3754 2404 1538 1096
07-29 63° 83° 5327 3795 2436 1561 1115
07-30 66° 79° 5377 3836 2466 1583 1132
07-31 54° 76° 5420 3869 2489 1598 1142
08-01 54° 76° 5463 3902 2512 1613 1152
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 53° 77° 5507 3935 2535 1629 1162
08-03 56° 75° 5550 3969 2559 1644 1173
08-04 63° 75° 5597 4006 2586 1663 1187
08-05 59° 79° 5645 4043 2613 1683 1201
08-06 68° 80° 5696 4085 2645 1706 1220
08-07 66° 85° 5750 4128 2679 1732 1241
08-08 70° 87° 5806 4175 2715 1760 1264
08-09 67° 82° 5859 4217 2747 1785 1284
08-10 65° 82° 5910 4259 2779 1808 1302
08-11 59° 77° 5956 4295 2805 1826 1315
08-12 66° 79° 6007 4336 2836 1849 1333
08-13 58° 78° 6053 4372 2862 1867 1346
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 64° 79° 6103 4411 2891 1889 1362
08-15 67° 83° 6156 4454 2924 1914 1382
08-16 67° 81° 6208 4496 2956 1938 1401
08-17 67° 76° 6257 4536 2986 1959 1418
08-18 64° 75° 6305 4573 3013 1979 1433
08-19 65° 84° 6358 4616 3046 2004 1452
08-20 65° 80° 6408 4656 3077 2026 1470
08-21 63° 81° 6458 4697 3107 2048 1487
08-22 67° 77° 6508 4737 3137 2070 1504
08-23 58° 69° 6550 4768 3158 2084 1512
08-24 54° 63° 6586 4795 3175 2092 1516
08-25 48° 68° 6622 4821 3191 2100 1519
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 51° 73° 6662 4851 3211 2112 1526
08-27 53° 77° 6705 4884 3234 2127 1536
08-28 59° 75° 6750 4919 3259 2144 1548
08-29 57° 72° 6793 4951 3281 2159 1558
08-30 58° 74° 6837 4985 3305 2175 1569
08-31 52° 76° 6879 5017 3328 2189 1578
09-01 54° 77° 6923 5051 3351 2205 1589
09-02 57° 74° 6966 5085 3375 2220 1599
09-03 49° 65° 7001 5110 3390 2227 1601
09-04 43° 57° 7029 5128 3398 2227 1601
09-05 44° 57° 7058 5146 3407 2228 1601
09-06 42° 57° 7086 5164 3414 2228 1601
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 40° 62° 7114 5183 3423 2229 1601
09-08 44° 76° 7152 5211 3441 2239 1606
09-09 62° 68° 7196 5244 3464 2254 1616
09-10 59° 71° 7238 5277 3487 2269 1626
09-11 55° 75° 7281 5310 3510 2284 1636
09-12 60° 80° 7330 5348 3538 2304 1651
09-13 64° 82° 7381 5389 3569 2327 1669
09-14 67° 79° 7432 5430 3600 2350 1687
09-15 70° 78° 7484 5472 3632 2374 1707
09-16 67° 89° 7540 5518 3668 2402 1730
09-17 64° 82° 7591 5559 3699 2425 1748
09-18 64° 81° 7641 5600 3730 2448 1765
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 65° 72° 7688 5636 3756 2466 1779
09-20 63° 71° 7733 5671 3781 2483 1791
09-21 63° 76° 7780 5709 3809 2503 1805
09-22 58° 72° 7823 5742 3832 2518 1815
09-23 58° 73° 7867 5776 3856 2534 1826
09-24 54° 73° 7909 5808 3878 2548 1835
09-25 53° 78° 7953 5841 3901 2563 1846
09-26 54° 74° 7995 5874 3924 2578 1855
09-27 52° 71° 8035 5903 3943 2589 1861
09-28 45° 74° 8072 5931 3961 2599 1866
09-29 51° 83° 8117 5966 3986 2616 1878
09-30 62° 80° 8166 6005 4015 2637 1894
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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