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)
forecast for Tue, Dec. 16. 2025

 
  

Rochester, NY

        

Generously Supported By:



Tabular Data

Daily GDD accumulation for various base temperature models in 2024 & 2023

2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 20° 28° 2 0 0 0 0
02-16 20° 30° 6 0 0 0 0
02-17 13° 21° 6 0 0 0 0
02-18 9° 19° 6 0 0 0 0
02-19 13° 21° 6 0 0 0 0
02-20 15° 20° 6 0 0 0 0
02-21 15° 20° 6 0 0 0 0
02-22 16° 34° 9 0 0 0 0
02-23 25° 33° 16 0 0 0 0
02-24 29° 47° 32 6 0 0 0
02-25 37° 44° 50 14 0 0 0
02-26 32° 41° 65 19 0 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 34° 43° 81 25 0 0 0
02-28 29° 44° 95 29 0 0 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 17° 43° 103 29 0 0 0
03-02 10° 22° 103 29 0 0 0
03-03 19° 35° 108 29 0 0 0
03-04 30° 56° 129 41 1 0 0
03-05 45° 58° 159 60 11 2 0
03-06 29° 43° 173 64 11 2 0
03-07 31° 39° 186 67 11 2 0
03-08 23° 36° 193 67 11 2 0
03-09 26° 47° 208 72 11 2 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 36° 59° 233 87 17 2 0
03-11 34° 64° 261 104 24 2 0
03-12 27° 35° 270 104 24 2 0
03-13 26° 56° 289 113 24 2 0
03-14 24° 69° 313 128 28 2 0
03-15 52° 65° 349 154 45 10 3
03-16 47° 73° 388 182 63 20 9
03-17 29° 46° 403 188 63 20 9
03-18 25° 65° 426 201 66 20 9
03-19 45° 76° 465 229 84 31 14
03-20 34° 61° 490 245 90 31 14
03-21 27° 46° 505 250 90 31 14
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 25° 52° 521 256 90 31 14
03-23 21° 34° 527 256 90 31 14
03-24 32° 53° 548 267 90 31 14
03-25 32° 40° 562 271 90 31 14
03-26 26° 36° 571 271 90 31 14
03-27 22° 49° 585 275 90 31 14
03-28 33° 52° 605 285 91 31 14
03-29 29° 39° 617 287 91 31 14
03-30 30° 60° 641 301 94 31 14
03-31 35° 61° 667 316 100 31 14
04-01 30° 40° 680 319 100 31 14
04-02 29° 44° 694 324 100 31 14
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 47° 68° 729 349 116 38 16
04-04 39° 50° 752 362 118 38 16
04-05 42° 62° 782 382 129 40 16
04-06 37° 45° 802 392 129 40 16
04-07 30° 48° 819 399 129 40 16
04-08 24° 32° 825 399 129 40 16
04-09 22° 40° 834 399 129 40 16
04-10 29° 43° 848 403 129 40 16
04-11 38° 44° 867 412 129 40 16
04-12 38° 43° 886 421 129 40 16
04-13 35° 58° 910 435 133 40 16
04-14 38° 68° 942 456 144 44 16
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 36° 58° 966 471 149 44 16
04-16 33° 41° 981 476 149 44 16
04-17 31° 54° 1002 487 149 44 16
04-18 36° 73° 1034 509 162 48 16
04-19 48° 72° 1072 537 179 58 21
04-20 38° 51° 1095 550 182 58 21
04-21 38° 68° 1126 571 193 61 21
04-22 47° 58° 1156 591 204 63 21
04-23 36° 63° 1184 609 211 63 21
04-24 48° 75° 1224 638 231 75 27
04-25 53° 64° 1260 665 248 84 31
04-26 42° 62° 1291 686 258 86 31
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 43° 64° 1322 707 269 89 31
04-28 39° 70° 1355 729 282 94 31
04-29 52° 84° 1401 765 308 112 44
04-30 38° 52° 1423 778 311 112 44
05-01 42° 66° 1456 800 323 116 44
05-02 53° 70° 1495 830 342 128 51
05-03 44° 53° 1522 847 349 128 51
05-04 47° 55° 1550 865 358 128 51
05-05 51° 67° 1588 892 375 137 55
05-06 55° 68° 1627 922 395 149 62
05-07 54° 67° 1666 951 413 160 67
05-08 43° 55° 1693 968 420 160 67
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 37° 55° 1717 982 424 160 67
05-10 42° 70° 1751 1006 439 166 68
05-11 44° 59° 1781 1025 448 167 68
05-12 41° 78° 1819 1053 466 177 73
05-13 57° 77° 1863 1088 491 194 85
05-14 62° 70° 1907 1122 514 210 96
05-15 61° 76° 1954 1159 541 228 110
05-16 61° 82° 2003 1198 571 250 126
05-17 56° 74° 2047 1231 594 265 136
05-18 51° 58° 2079 1254 606 270 136
05-19 45° 57° 2108 1273 615 270 136
05-20 38° 57° 2133 1288 621 270 136
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 45° 56° 2162 1306 629 271 136
05-22 48° 56° 2192 1326 639 273 136
05-23 48° 52° 2220 1345 647 273 136
05-24 48° 57° 2250 1365 657 275 136
05-25 47° 62° 2283 1388 670 280 136
05-26 45° 70° 2318 1413 686 287 139
05-27 45° 74° 2356 1441 704 297 144
05-28 49° 67° 2392 1467 720 305 147
05-29 55° 69° 2432 1497 740 317 154
05-30 56° 74° 2475 1530 763 332 164
05-31 47° 60° 2507 1552 774 336 164
06-01 49° 58° 2539 1573 786 340 164
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 45° 71° 2574 1599 802 347 167
06-03 52° 85° 2621 1636 829 366 181
06-04 65° 90° 2677 1681 864 394 203
06-05 64° 74° 2724 1719 891 413 217
06-06 62° 70° 2768 1753 915 429 228
06-07 59° 79° 2815 1790 942 448 242
06-08 52° 75° 2857 1821 964 462 251
06-09 63° 78° 2905 1860 993 482 267
06-10 62° 73° 2951 1896 1018 500 279
06-11 61° 81° 3000 1935 1047 521 295
06-12 62° 75° 3046 1971 1073 539 308
06-13 54° 66° 3084 1999 1092 549 314
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 56° 70° 3125 2030 1113 562 322
06-15 60° 74° 3170 2065 1138 579 334
06-16 56° 76° 3214 2099 1162 595 345
06-17 61° 84° 3265 2140 1192 618 362
06-18 70° 82° 3319 2183 1226 644 383
06-19 62° 79° 3367 2222 1254 664 398
06-20 62° 76° 3414 2259 1282 683 413
06-21 62° 85° 3466 2301 1313 707 431
06-22 78° 88° 3527 2352 1354 740 459
06-23 76° 93° 3590 2404 1397 775 489
06-24 77° 94° 3653 2458 1441 810 520
06-25 72° 85° 3710 2505 1477 839 543
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 60° 73° 3754 2539 1502 855 555
06-27 64° 81° 3805 2580 1532 878 572
06-28 66° 84° 3858 2623 1565 903 592
06-29 61° 78° 3905 2660 1592 922 606
06-30 62° 89° 3959 2704 1626 948 627
07-01 72° 81° 4014 2749 1661 975 649
07-02 65° 83° 4066 2791 1694 999 669
07-03 65° 79° 4116 2831 1724 1021 686
07-04 57° 77° 4161 2866 1748 1038 697
07-05 58° 92° 4214 2909 1781 1063 717
07-06 74° 94° 4276 2961 1823 1097 746
07-07 71° 87° 4333 3008 1860 1126 770
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 67° 76° 4383 3048 1890 1148 787
07-09 64° 79° 4432 3087 1920 1169 804
07-10 65° 84° 4485 3130 1952 1194 823
07-11 66° 88° 4540 3175 1987 1221 845
07-12 72° 91° 4599 3224 2027 1252 872
07-13 75° 89° 4660 3274 2067 1285 899
07-14 70° 81° 4713 3318 2101 1310 920
07-15 67° 88° 4769 3364 2136 1338 942
07-16 67° 88° 4824 3409 2172 1365 965
07-17 67° 83° 4877 3452 2205 1390 985
07-18 59° 74° 4921 3486 2229 1406 996
07-19 54° 83° 4968 3523 2255 1425 1009
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 65° 80° 5019 3563 2286 1448 1027
07-21 59° 72° 5062 3597 2310 1463 1038
07-22 51° 74° 5103 3628 2331 1476 1046
07-23 52° 86° 5150 3665 2357 1495 1059
07-24 67° 94° 5209 3714 2396 1526 1085
07-25 72° 82° 5264 3759 2431 1553 1107
07-26 66° 89° 5319 3804 2466 1580 1129
07-27 73° 88° 5378 3853 2505 1611 1155
07-28 69° 92° 5436 3901 2544 1641 1181
07-29 70° 88° 5494 3948 2581 1671 1205
07-30 65° 86° 5548 3992 2615 1697 1226
07-31 60° 75° 5593 4028 2640 1714 1238
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 54° 74° 5635 4060 2663 1728 1248
08-02 50° 79° 5678 4093 2685 1743 1257
08-03 55° 82° 5725 4129 2712 1762 1271
08-04 58° 82° 5773 4168 2740 1782 1286
08-05 59° 83° 5822 4207 2769 1803 1302
08-06 64° 84° 5874 4249 2801 1827 1321
08-07 65° 83° 5926 4291 2833 1851 1340
08-08 64° 86° 5979 4334 2866 1876 1360
08-09 67° 90° 6036 4381 2903 1905 1384
08-10 69° 92° 6095 4429 2942 1936 1410
08-11 67° 92° 6152 4477 2980 1965 1435
08-12 71° 90° 6211 4526 3018 1996 1460
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 71° 84° 6267 4571 3054 2024 1483
08-14 66° 83° 6319 4614 3086 2048 1502
08-15 59° 85° 6369 4654 3116 2070 1519
08-16 63° 87° 6422 4697 3150 2095 1540
08-17 62° 80° 6471 4736 3178 2116 1555
08-18 56° 70° 6512 4767 3199 2129 1563
08-19 54° 80° 6557 4802 3224 2146 1575
08-20 58° 69° 6599 4833 3246 2160 1584
08-21 57° 71° 6640 4865 3268 2173 1593
08-22 57° 81° 6687 4902 3294 2192 1606
08-23 61° 82° 6737 4941 3324 2214 1623
08-24 63° 76° 6784 4979 3352 2233 1638
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 58° 72° 6827 5012 3375 2248 1648
08-26 55° 72° 6869 5043 3396 2262 1656
08-27 55° 70° 6909 5074 3416 2274 1663
08-28 54° 75° 6952 5107 3439 2289 1673
08-29 52° 63° 6988 5132 3455 2297 1676
08-30 48° 69° 7024 5159 3472 2305 1680
08-31 51° 73° 7064 5189 3492 2317 1687
09-01 48° 76° 7104 5219 3512 2329 1694
09-02 53° 79° 7148 5253 3536 2345 1705
09-03 57° 82° 7196 5291 3563 2365 1719
09-04 55° 75° 7239 5323 3586 2380 1729
09-05 52° 79° 7282 5357 3609 2395 1739
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 56° 67° 7321 5386 3628 2406 1745
09-07 54° 67° 7360 5414 3647 2417 1751
09-08 47° 67° 7394 5439 3662 2423 1753
09-09 46° 75° 7433 5468 3680 2434 1758
09-10 51° 77° 7475 5500 3702 2448 1767
09-11 50° 76° 7516 5530 3723 2461 1775
09-12 51° 75° 7557 5561 3744 2474 1783
09-13 53° 74° 7598 5593 3766 2487 1792
09-14 57° 76° 7643 5628 3790 2504 1803
09-15 55° 75° 7686 5661 3813 2519 1813
09-16 51° 76° 7728 5692 3835 2533 1822
09-17 52° 78° 7771 5725 3858 2548 1832
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 51° 81° 7815 5759 3882 2564 1843
09-19 51° 69° 7853 5787 3900 2574 1848
09-20 45° 67° 7887 5812 3914 2580 1849
09-21 47° 84° 7930 5845 3937 2595 1859
09-22 62° 77° 7978 5882 3965 2615 1874
09-23 64° 75° 8025 5920 3992 2634 1888
09-24 59° 74° 8070 5954 4017 2651 1900
09-25 64° 69° 8114 5989 4041 2667 1911
09-26 60° 73° 8159 6024 4066 2684 1923
09-27 56° 78° 8204 6059 4091 2701 1935
09-28 56° 77° 8249 6093 4116 2718 1947
09-29 47° 78° 8289 6124 4137 2730 1955
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 50° 71° 8328 6153 4155 2741 1960
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 19° 35° 5 0 0 0 0
02-16 25° 33° 12 0 0 0 0
02-17 16° 25° 12 0 0 0 0
02-18 18° 32° 15 0 0 0 0
02-19 17° 29° 16 0 0 0 0
02-20 16° 42° 23 0 0 0 0
02-21 26° 55° 42 9 0 0 0
02-22 41° 48° 64 21 2 0 0
02-23 30° 50° 82 29 2 0 0
02-24 15° 26° 82 29 2 0 0
02-25 14° 47° 91 29 2 0 0
02-26 33° 50° 111 39 2 0 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 37° 71° 143 61 14 4 0
02-28 25° 66° 166 74 18 4 0
02-29 21° 28° 168 74 18 4 0
03-01 21° 53° 183 79 18 4 0
03-02 41° 48° 205 91 20 4 0
03-03 43° 51° 230 106 25 4 0
03-04 39° 73° 264 130 39 10 1
03-05 53° 72° 304 160 59 23 8
03-06 39° 53° 328 174 63 23 8
03-07 34° 48° 348 183 63 23 8
03-08 28° 59° 369 195 65 23 8
03-09 41° 52° 394 210 69 23 8
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 27° 40° 405 211 69 23 8
03-11 29° 43° 420 216 69 23 8
03-12 34° 58° 444 230 74 23 8
03-13 42° 68° 477 253 86 27 8
03-14 36° 61° 503 269 93 27 8
03-15 40° 51° 527 283 96 27 8
03-16 37° 54° 550 296 100 27 8
03-17 34° 45° 568 303 100 27 8
03-18 30° 37° 579 305 100 27 8
03-19 27° 35° 588 305 100 27 8
03-20 24° 34° 595 305 100 27 8
03-21 22° 30° 599 305 100 27 8
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 16° 27° 599 305 100 27 8
03-23 23° 31° 604 305 100 27 8
03-24 21° 34° 610 305 100 27 8
03-25 24° 58° 629 314 100 27 8
03-26 46° 66° 663 338 113 33 9
03-27 39° 55° 688 353 118 33 9
03-28 36° 47° 707 362 118 33 9
03-29 28° 41° 720 365 118 33 9
03-30 31° 48° 737 372 118 33 9
03-31 38° 49° 758 383 120 33 9
04-01 36° 51° 780 395 121 33 9
04-02 41° 47° 802 407 123 33 9
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 36° 47° 821 416 123 33 9
04-04 34° 37° 835 420 123 33 9
04-05 33° 41° 850 425 123 33 9
04-06 39° 55° 875 440 128 33 9
04-07 37° 56° 900 455 133 33 9
04-08 34° 61° 925 470 138 33 9
04-09 40° 77° 962 497 155 42 13
04-10 52° 63° 998 522 170 49 16
04-11 47° 69° 1034 549 186 57 19
04-12 43° 62° 1064 569 197 60 19
04-13 39° 50° 1087 582 200 60 19
04-14 42° 63° 1118 603 211 63 19
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 42° 56° 1145 620 218 63 19
04-16 42° 61° 1174 639 227 64 19
04-17 41° 49° 1197 652 230 64 19
04-18 52° 58° 1230 675 243 69 19
04-19 45° 61° 1261 696 254 72 19
04-20 41° 52° 1286 710 258 72 19
04-21 40° 44° 1306 721 258 72 19
04-22 32° 52° 1325 730 258 72 19
04-23 42° 67° 1358 753 271 77 19
04-24 34° 51° 1378 763 271 77 19
04-25 29° 45° 1393 768 271 77 19
04-26 25° 58° 1413 778 271 77 19
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 48° 59° 1444 799 283 80 19
04-28 55° 70° 1485 830 303 92 26
04-29 44° 59° 1514 849 313 94 26
04-30 47° 58° 1545 870 323 96 26
05-01 49° 71° 1582 897 341 106 31
05-02 53° 66° 1620 925 359 116 36
05-03 47° 75° 1659 954 378 127 42
05-04 53° 69° 1698 983 397 138 48
05-05 52° 66° 1735 1010 414 147 52
05-06 52° 69° 1774 1039 432 157 57
05-07 44° 71° 1809 1064 448 165 60
05-08 50° 74° 1849 1094 468 177 67
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 45° 61° 1880 1115 479 180 67
05-10 49° 62° 1914 1139 492 186 67
05-11 43° 64° 1945 1160 504 189 67
05-12 48° 62° 1978 1183 517 194 67
05-13 50° 72° 2017 1212 536 205 73
05-14 56° 75° 2061 1245 559 220 84
05-15 55° 63° 2097 1272 576 229 88
05-16 55° 72° 2139 1303 597 242 96
05-17 56° 76° 2183 1338 621 258 107
05-18 59° 70° 2225 1370 644 273 116
05-19 54° 75° 2267 1402 666 287 125
05-20 59° 83° 2316 1441 695 308 141
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 66° 86° 2370 1485 729 334 162
05-22 67° 88° 2426 1531 765 362 185
05-23 62° 79° 2474 1569 793 382 200
05-24 58° 77° 2520 1605 818 399 213
05-25 52° 72° 2560 1634 838 411 220
05-26 59° 74° 2604 1669 863 428 231
05-27 63° 77° 2652 1707 891 448 246
05-28 59° 68° 2693 1738 912 461 255
05-29 54° 67° 2732 1767 930 471 260
05-30 47° 65° 2766 1791 944 478 261
05-31 45° 74° 2804 1818 962 487 266
06-01 49° 77° 2845 1850 983 500 274
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 55° 76° 2888 1883 1007 516 284
06-03 62° 77° 2936 1921 1035 536 299
06-04 60° 84° 2986 1961 1065 558 316
06-05 66° 85° 3039 2004 1098 583 336
06-06 64° 77° 3088 2043 1126 603 352
06-07 59° 67° 3129 2074 1147 617 360
06-08 57° 72° 3171 2106 1170 631 369
06-09 54° 67° 3210 2135 1189 642 375
06-10 52° 58° 3243 2158 1201 647 375
06-11 54° 59° 3278 2183 1216 653 377
06-12 51° 73° 3318 2212 1236 665 384
06-13 59° 88° 3369 2254 1267 689 402
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 64° 77° 3417 2292 1296 709 417
06-15 57° 69° 3458 2323 1317 722 425
06-16 49° 78° 3500 2354 1338 735 434
06-17 68° 90° 3557 2402 1375 764 458
06-18 71° 92° 3616 2451 1415 796 485
06-19 75° 90° 3677 2502 1456 829 512
06-20 72° 89° 3736 2551 1494 860 538
06-21 68° 82° 3789 2594 1527 885 558
06-22 69° 81° 3842 2637 1561 910 578
06-23 67° 83° 3895 2680 1594 935 598
06-24 63° 81° 3945 2720 1624 957 615
06-25 63° 82° 3996 2761 1654 980 633
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 64° 81° 4047 2801 1685 1002 651
06-27 59° 72° 4090 2835 1708 1018 661
06-28 49° 78° 4132 2866 1730 1031 670
06-29 67° 77° 4182 2907 1760 1053 687
06-30 60° 77° 4227 2942 1785 1071 699
07-01 58° 74° 4270 2975 1809 1086 710
07-02 52° 78° 4314 3009 1832 1102 720
07-03 70° 90° 4371 3056 1870 1131 745
07-04 73° 85° 4429 3103 1907 1160 769
07-05 70° 86° 4485 3150 1944 1189 792
07-06 69° 83° 4539 3194 1977 1214 813
07-07 64° 82° 4590 3234 2008 1237 831
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 63° 86° 4642 3277 2041 1262 850
07-09 68° 85° 4697 3322 2075 1289 872
07-10 70° 77° 4748 3363 2107 1312 890
07-11 69° 75° 4798 3403 2136 1333 907
07-12 67° 82° 4850 3445 2169 1358 926
07-13 66° 85° 4903 3488 2202 1383 946
07-14 62° 90° 4957 3532 2236 1409 967
07-15 71° 85° 5013 3578 2272 1437 990
07-16 67° 83° 5066 3621 2305 1462 1010
07-17 69° 78° 5117 3662 2336 1485 1029
07-18 62° 73° 5163 3698 2362 1503 1041
07-19 58° 76° 5208 3733 2386 1519 1053
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 56° 81° 5254 3769 2413 1538 1067
07-21 62° 82° 5304 3809 2443 1560 1083
07-22 64° 83° 5355 3850 2474 1583 1102
07-23 66° 80° 5407 3891 2505 1606 1120
07-24 68° 84° 5461 3935 2539 1632 1141
07-25 63° 76° 5508 3973 2567 1652 1155
07-26 58° 79° 5554 4009 2593 1670 1169
07-27 56° 81° 5601 4046 2620 1689 1182
07-28 58° 86° 5651 4086 2650 1711 1199
07-29 63° 85° 5703 4128 2682 1735 1218
07-30 66° 89° 5759 4174 2717 1762 1241
07-31 71° 84° 5814 4219 2753 1790 1263
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 69° 89° 5870 4265 2789 1818 1287
08-02 71° 78° 5923 4308 2822 1843 1306
08-03 70° 78° 5975 4350 2854 1867 1325
08-04 68° 86° 6030 4395 2889 1894 1348
08-05 67° 83° 6083 4438 2922 1919 1368
08-06 65° 70° 6129 4474 2948 1937 1380
08-07 59° 76° 6174 4509 2973 1954 1393
08-08 63° 82° 6225 4550 3003 1977 1410
08-09 71° 77° 6277 4592 3035 2000 1429
08-10 60° 74° 6322 4627 3060 2017 1441
08-11 59° 74° 6366 4661 3085 2034 1452
08-12 59° 73° 6410 4695 3109 2050 1463
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 61° 78° 6457 4732 3136 2069 1478
08-14 60° 81° 6506 4771 3165 2090 1493
08-15 60° 83° 6555 4810 3194 2111 1510
08-16 60° 87° 6607 4852 3226 2135 1528
08-17 70° 84° 6662 4897 3261 2162 1550
08-18 68° 79° 6713 4938 3292 2185 1569
08-19 57° 69° 6755 4970 3313 2199 1577
08-20 55° 65° 6793 4998 3331 2209 1582
08-21 53° 67° 6831 5026 3350 2219 1587
08-22 56° 74° 6874 5059 3372 2234 1597
08-23 56° 78° 6918 5093 3397 2250 1609
08-24 55° 79° 6963 5128 3422 2267 1621
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 58° 81° 7011 5166 3450 2287 1636
08-26 60° 83° 7060 5205 3479 2308 1652
08-27 61° 90° 7114 5249 3512 2333 1672
08-28 65° 77° 7162 5287 3541 2354 1688
08-29 63° 71° 7207 5322 3566 2371 1700
08-30 62° 85° 7259 5364 3598 2395 1718
08-31 67° 80° 7310 5405 3629 2418 1737
09-01 60° 81° 7359 5444 3658 2439 1752
09-02 53° 65° 7396 5471 3675 2448 1756
09-03 49° 72° 7435 5500 3694 2459 1762
09-04 51° 78° 7477 5532 3716 2473 1772
09-05 53° 81° 7522 5567 3741 2490 1784
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 59° 80° 7570 5605 3769 2510 1798
09-07 52° 64° 7606 5630 3784 2517 1801
09-08 47° 64° 7639 5654 3798 2523 1802
09-09 53° 69° 7678 5683 3817 2534 1808
09-10 55° 72° 7720 5715 3838 2547 1816
09-11 49° 76° 7760 5745 3859 2560 1823
09-12 55° 80° 7805 5780 3884 2577 1836
09-13 57° 78° 7851 5816 3910 2595 1848
09-14 56° 79° 7897 5852 3936 2613 1861
09-15 58° 82° 7945 5890 3963 2633 1876
09-16 57° 82° 7993 5927 3991 2652 1891
09-17 57° 80° 8039 5964 4018 2671 1904
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 56° 77° 8083 5998 4042 2687 1915
09-19 60° 78° 8130 6035 4069 2706 1930
09-20 54° 79° 8175 6070 4093 2723 1941
09-21 62° 81° 8224 6109 4123 2744 1957
09-22 59° 81° 8272 6147 4150 2763 1972
09-23 60° 68° 8314 6179 4172 2777 1981
09-24 60° 67° 8355 6210 4194 2791 1990
09-25 61° 72° 8400 6245 4218 2808 2001
09-26 57° 73° 8443 6277 4241 2822 2011
09-27 51° 75° 8483 6308 4262 2835 2019
09-28 61° 74° 8529 6344 4287 2853 2031
09-29 62° 74° 8575 6380 4313 2871 2044
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 57° 72° 8617 6412 4336 2885 2054

 

Latest Updates

February 15th, 2025Welcome to the 2025 GDD Tracking Season

Although winter seems very much entrenched in the Great Lakes region with snow and frigid temperatures in the forecast, GDDTracker starts 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. Beyond the spring models, 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 2025!
 

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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