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Relative Flowering Times for Broadleaf Weeds (GDD 50)
through Sun, Dec. 14. 2025

 
  

Waterford, MI

        

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 19° 31° 3 0 0 0 0
02-16 20° 28° 5 0 0 0 0
02-17 7° 19° 5 0 0 0 0
02-18 -0° 15° 5 0 0 0 0
02-19 2° 16° 5 0 0 0 0
02-20 14° 21° 5 0 0 0 0
02-21 21° 30° 8 0 0 0 0
02-22 16° 29° 9 0 0 0 0
02-23 21° 35° 15 0 0 0 0
02-24 30° 48° 32 7 0 0 0
02-25 37° 52° 55 20 3 0 0
02-26 27° 39° 66 21 3 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 34° 41° 81 26 3 0 0
02-28 29° 54° 101 36 3 0 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 19° 37° 107 36 3 0 0
03-02 17° 28° 107 36 3 0 0
03-03 18° 37° 113 36 3 0 0
03-04 33° 46° 131 43 3 0 0
03-05 35° 53° 153 56 5 0 0
03-06 25° 33° 160 56 5 0 0
03-07 28° 37° 171 56 5 0 0
03-08 20° 36° 177 56 5 0 0
03-09 32° 54° 198 67 6 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 34° 64° 225 84 13 0 0
03-11 33° 55° 247 96 15 0 0
03-12 29° 46° 263 102 15 0 0
03-13 27° 58° 284 113 16 0 0
03-14 35° 71° 314 133 27 3 0
03-15 56° 72° 356 165 49 17 9
03-16 30° 57° 378 177 50 17 9
03-17 26° 44° 391 180 50 17 9
03-18 34° 66° 419 198 59 17 9
03-19 53° 71° 460 229 79 29 16
03-20 31° 57° 482 241 81 29 16
03-21 24° 52° 498 246 81 29 16
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 28° 48° 514 252 81 29 16
03-23 22° 39° 522 252 81 29 16
03-24 34° 41° 538 258 81 29 16
03-25 27° 42° 550 260 81 29 16
03-26 26° 42° 562 262 81 29 16
03-27 25° 55° 580 270 81 29 16
03-28 39° 65° 611 291 91 32 16
03-29 56° 68° 650 321 111 44 23
03-30 51° 66° 687 347 128 52 27
03-31 35° 57° 711 361 132 52 27
04-01 23° 42° 722 362 132 52 27
04-02 32° 49° 740 371 132 52 27
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 44° 63° 772 392 143 55 27
04-04 35° 51° 793 403 144 55 27
04-05 41° 49° 816 416 147 55 27
04-06 32° 44° 832 422 147 55 27
04-07 27° 44° 846 426 147 55 27
04-08 22° 36° 853 426 147 55 27
04-09 24° 45° 865 429 147 55 27
04-10 32° 36° 878 431 147 55 27
04-11 30° 51° 896 439 147 55 27
04-12 27° 55° 915 449 147 55 27
04-13 38° 55° 940 464 152 55 27
04-14 45° 70° 976 489 168 63 30
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 39° 51° 999 503 171 63 30
04-16 34° 51° 1020 513 172 63 30
04-17 29° 60° 1043 526 175 63 30
04-18 50° 79° 1085 559 197 78 39
04-19 48° 68° 1122 585 213 86 42
04-20 37° 56° 1146 599 218 86 42
04-21 46° 71° 1183 626 234 94 46
04-22 41° 64° 1213 646 245 97 46
04-23 46° 75° 1252 675 264 107 51
04-24 49° 82° 1295 708 287 122 61
04-25 52° 75° 1336 740 308 136 70
04-26 42° 57° 1364 757 316 136 70
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 37° 66° 1394 777 325 137 70
04-28 44° 73° 1430 803 341 146 73
04-29 50° 83° 1474 838 366 162 85
04-30 36° 62° 1502 855 374 162 85
05-01 44° 68° 1536 879 388 169 86
05-02 53° 67° 1574 907 406 179 91
05-03 44° 52° 1600 923 412 179 91
05-04 40° 53° 1624 938 416 179 91
05-05 48° 67° 1660 963 431 186 93
05-06 53° 60° 1694 987 445 192 94
05-07 50° 75° 1734 1017 466 204 102
05-08 41° 55° 1760 1033 472 204 102
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 34° 63° 1787 1050 479 204 102
05-10 46° 76° 1826 1079 497 215 107
05-11 43° 67° 1859 1102 511 220 108
05-12 45° 80° 1899 1133 531 233 115
05-13 63° 68° 1942 1166 554 248 125
05-14 60° 74° 1988 1201 579 265 137
05-15 58° 81° 2035 1238 607 284 152
05-16 59° 82° 2084 1277 635 305 167
05-17 55° 70° 2124 1308 656 318 175
05-18 52° 60° 2158 1332 670 324 176
05-19 44° 57° 2187 1350 679 324 176
05-20 38° 55° 2211 1364 683 324 176
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 47° 51° 2238 1382 690 324 176
05-22 47° 52° 2266 1399 698 324 176
05-23 40° 53° 2290 1414 702 324 176
05-24 41° 61° 2319 1433 711 325 176
05-25 40° 64° 2349 1453 721 327 176
05-26 42° 70° 2383 1477 735 333 177
05-27 50° 72° 2422 1506 754 344 183
05-28 52° 59° 2456 1529 767 349 183
05-29 54° 64° 2492 1556 784 358 187
05-30 51° 76° 2534 1587 805 371 196
05-31 48° 63° 2567 1611 819 377 196
06-01 41° 67° 2599 1632 831 381 196
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 43° 78° 2638 1661 850 392 202
06-03 55° 86° 2686 1700 878 412 218
06-04 63° 82° 2737 1740 909 435 235
06-05 55° 69° 2777 1770 929 447 242
06-06 56° 76° 2821 1804 953 463 253
06-07 54° 78° 2865 1838 977 479 264
06-08 57° 76° 2909 1873 1001 495 276
06-09 58° 77° 2955 1908 1027 513 288
06-10 51° 72° 2994 1938 1046 524 295
06-11 52° 85° 3041 1974 1073 543 308
06-12 60° 75° 3086 2010 1098 560 321
06-13 56° 71° 3128 2041 1120 574 329
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 55° 77° 3172 2075 1143 589 340
06-15 55° 79° 3217 2110 1169 607 352
06-16 57° 83° 3265 2148 1196 626 367
06-17 62° 88° 3317 2191 1229 651 387
06-18 67° 79° 3369 2232 1260 674 405
06-19 61° 72° 3413 2267 1285 691 417
06-20 59° 76° 3459 2302 1311 709 429
06-21 66° 88° 3514 2347 1346 736 451
06-22 77° 92° 3577 2400 1388 770 481
06-23 74° 94° 3638 2452 1430 804 510
06-24 73° 91° 3699 2502 1470 836 537
06-25 71° 79° 3752 2545 1503 861 557
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 65° 84° 3804 2588 1536 886 577
06-27 72° 89° 3863 2636 1575 917 602
06-28 67° 77° 3913 2676 1605 939 619
06-29 61° 87° 3965 2718 1636 962 638
06-30 68° 81° 4017 2761 1669 987 658
07-01 70° 83° 4072 2805 1704 1014 679
07-02 62° 85° 4123 2847 1735 1037 698
07-03 66° 84° 4176 2890 1768 1062 717
07-04 61° 87° 4228 2932 1800 1086 736
07-05 68° 91° 4285 2979 1837 1115 761
07-06 71° 91° 4345 3028 1877 1147 787
07-07 64° 75° 4393 3066 1904 1166 802
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 56° 83° 4440 3103 1932 1186 816
07-09 67° 79° 4491 3144 1963 1209 834
07-10 62° 85° 4542 3186 1994 1232 853
07-11 64° 84° 4595 3228 2027 1257 872
07-12 71° 86° 4651 3275 2063 1285 895
07-13 69° 86° 4707 3320 2099 1313 918
07-14 63° 84° 4759 3362 2131 1337 937
07-15 63° 88° 4813 3406 2164 1362 958
07-16 70° 85° 4868 3451 2200 1390 980
07-17 64° 75° 4916 3489 2228 1410 995
07-18 54° 77° 4959 3522 2251 1425 1005
07-19 59° 81° 5007 3560 2279 1445 1020
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 65° 79° 5056 3600 2308 1466 1037
07-21 57° 77° 5102 3635 2333 1483 1049
07-22 53° 81° 5147 3670 2359 1501 1061
07-23 58° 88° 5198 3711 2390 1524 1079
07-24 73° 95° 5260 3763 2432 1558 1108
07-25 72° 84° 5316 3809 2468 1586 1131
07-26 69° 81° 5369 3852 2501 1611 1151
07-27 72° 91° 5428 3902 2540 1642 1178
07-28 69° 89° 5485 3949 2577 1671 1201
07-29 69° 87° 5541 3994 2613 1699 1224
07-30 63° 84° 5593 4036 2645 1723 1243
07-31 60° 74° 5638 4071 2670 1740 1255
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 56° 76° 5682 4105 2694 1756 1266
08-02 53° 78° 5725 4139 2717 1771 1277
08-03 57° 80° 5772 4175 2744 1790 1290
08-04 58° 82° 5820 4213 2771 1809 1305
08-05 62° 84° 5870 4254 2802 1832 1323
08-06 64° 83° 5922 4295 2834 1856 1341
08-07 64° 84° 5974 4338 2866 1880 1361
08-08 65° 88° 6029 4382 2901 1907 1382
08-09 69° 89° 6086 4429 2938 1936 1406
08-10 69° 91° 6144 4477 2976 1966 1431
08-11 70° 90° 6202 4525 3014 1996 1456
08-12 69° 89° 6259 4572 3051 2025 1480
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 68° 82° 6312 4615 3084 2050 1500
08-14 62° 83° 6363 4656 3115 2073 1518
08-15 63° 85° 6415 4698 3147 2097 1537
08-16 66° 89° 6471 4744 3183 2125 1560
08-17 62° 80° 6520 4784 3212 2146 1576
08-18 54° 80° 6565 4818 3237 2163 1588
08-19 64° 75° 6613 4856 3265 2183 1603
08-20 64° 70° 6658 4891 3289 2199 1615
08-21 62° 74° 6703 4927 3315 2217 1628
08-22 55° 82° 6750 4963 3342 2236 1641
08-23 64° 78° 6799 5002 3371 2257 1657
08-24 55° 75° 6842 5035 3393 2271 1667
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 52° 67° 6879 5063 3411 2281 1671
08-26 48° 69° 6916 5089 3427 2289 1675
08-27 47° 74° 6954 5117 3446 2300 1680
08-28 53° 68° 6992 5146 3464 2310 1686
08-29 47° 65° 7027 5170 3479 2317 1687
08-30 44° 72° 7063 5196 3495 2325 1690
08-31 46° 75° 7102 5225 3513 2335 1696
09-01 49° 78° 7143 5256 3535 2349 1704
09-02 49° 79° 7185 5288 3557 2363 1713
09-03 53° 80° 7230 5323 3581 2379 1725
09-04 51° 65° 7266 5349 3598 2388 1728
09-05 46° 70° 7302 5375 3614 2396 1731
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 50° 63° 7336 5400 3628 2402 1733
09-07 42° 67° 7369 5422 3640 2406 1733
09-08 42° 69° 7402 5446 3654 2412 1733
09-09 46° 75° 7441 5474 3672 2422 1738
09-10 51° 78° 7483 5506 3695 2437 1748
09-11 51° 79° 7526 5539 3717 2451 1758
09-12 51° 80° 7569 5572 3741 2467 1768
09-13 55° 78° 7614 5607 3766 2484 1780
09-14 51° 82° 7658 5641 3790 2500 1791
09-15 55° 82° 7705 5678 3816 2518 1805
09-16 53° 83° 7751 5714 3842 2536 1818
09-17 52° 83° 7796 5749 3868 2554 1830
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 55° 86° 7845 5788 3897 2575 1846
09-19 62° 79° 7893 5826 3925 2595 1861
09-20 55° 78° 7938 5861 3949 2611 1872
09-21 57° 70° 7979 5892 3971 2625 1881
09-22 61° 75° 8025 5929 3997 2643 1894
09-23 60° 73° 8070 5963 4021 2659 1906
09-24 62° 74° 8116 5999 4047 2677 1918
09-25 61° 75° 8162 6035 4073 2695 1931
09-26 54° 80° 8207 6070 4098 2712 1943
09-27 54° 85° 8254 6107 4126 2732 1958
09-28 60° 81° 8303 6146 4154 2752 1973
09-29 50° 83° 8347 6180 4179 2769 1985
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 51° 81° 8391 6214 4203 2785 1996
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 27° 37° 10 0 0 0 0
02-16 24° 29° 14 0 0 0 0
02-17 19° 26° 15 0 0 0 0
02-18 18° 34° 19 0 0 0 0
02-19 19° 39° 26 0 0 0 0
02-20 22° 48° 39 3 0 0 0
02-21 30° 59° 62 16 3 0 0
02-22 35° 52° 83 27 4 0 0
02-23 23° 48° 97 31 4 0 0
02-24 19° 32° 100 31 4 0 0
02-25 24° 48° 115 35 4 0 0
02-26 32° 54° 136 46 5 0 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 43° 72° 171 71 21 7 2
02-28 22° 60° 190 80 21 7 2
02-29 19° 35° 195 80 21 7 2
03-01 26° 47° 210 85 21 7 2
03-02 38° 52° 233 98 24 7 2
03-03 34° 58° 257 112 27 7 2
03-04 41° 71° 291 136 42 13 3
03-05 41° 58° 318 153 49 13 3
03-06 36° 44° 336 161 49 13 3
03-07 35° 52° 358 173 51 13 3
03-08 40° 51° 381 186 54 13 3
03-09 34° 53° 403 198 56 13 3
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 29° 36° 414 199 56 13 3
03-11 28° 55° 433 208 56 13 3
03-12 41° 68° 466 231 68 18 3
03-13 48° 69° 502 257 85 27 7
03-14 44° 53° 528 273 91 27 7
03-15 36° 46° 547 282 91 27 7
03-16 32° 57° 570 295 94 27 7
03-17 30° 40° 583 298 94 27 7
03-18 26° 32° 590 298 94 27 7
03-19 29° 44° 605 303 94 27 7
03-20 25° 36° 614 303 94 27 7
03-21 19° 35° 618 303 94 27 7
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 25° 28° 623 303 94 27 7
03-23 25° 33° 630 303 94 27 7
03-24 20° 39° 638 303 94 27 7
03-25 31° 61° 662 317 98 27 7
03-26 44° 56° 690 335 106 27 7
03-27 29° 43° 704 339 106 27 7
03-28 26° 46° 719 343 106 27 7
03-29 26° 50° 735 350 106 27 7
03-30 34° 42° 751 356 106 27 7
03-31 36° 45° 769 364 106 27 7
04-01 35° 53° 792 376 108 27 7
04-02 38° 47° 812 387 109 27 7
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 36° 47° 832 397 109 27 7
04-04 33° 47° 849 404 109 27 7
04-05 34° 46° 867 412 109 27 7
04-06 38° 55° 892 427 114 27 7
04-07 31° 57° 914 439 115 27 7
04-08 47° 72° 951 466 133 36 11
04-09 48° 74° 990 495 152 47 17
04-10 41° 65° 1021 516 163 50 17
04-11 45° 53° 1049 533 170 50 17
04-12 44° 50° 1074 549 175 50 17
04-13 40° 60° 1102 567 183 50 17
04-14 47° 77° 1142 597 203 62 24
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 45° 63° 1174 619 215 66 24
04-16 44° 64° 1206 640 227 70 24
04-17 51° 64° 1241 666 243 78 27
04-18 50° 64° 1276 691 258 85 29
04-19 42° 56° 1304 708 265 85 29
04-20 36° 45° 1322 717 265 85 29
04-21 36° 44° 1340 725 265 85 29
04-22 32° 63° 1365 740 271 85 29
04-23 48° 57° 1396 760 281 87 29
04-24 32° 48° 1414 769 281 87 29
04-25 28° 54° 1432 777 281 87 29
04-26 33° 63° 1458 793 287 87 29
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 51° 79° 1501 826 310 102 39
04-28 61° 77° 1548 863 337 121 53
04-29 57° 79° 1594 899 362 139 66
04-30 53° 70° 1634 929 382 151 73
05-01 48° 79° 1676 960 404 164 81
05-02 47° 71° 1713 988 421 174 86
05-03 56° 71° 1754 1019 443 187 94
05-04 56° 73° 1797 1051 465 201 103
05-05 55° 67° 1835 1080 484 212 109
05-06 46° 67° 1870 1105 498 219 111
05-07 43° 67° 1903 1128 512 224 111
05-08 53° 75° 1945 1160 534 238 120
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 48° 58° 1976 1181 545 241 120
05-10 43° 64° 2008 1203 556 244 120
05-11 49° 55° 2038 1222 566 246 120
05-12 41° 70° 2071 1246 580 252 121
05-13 57° 81° 2118 1283 606 271 135
05-14 56° 69° 2159 1314 627 284 142
05-15 51° 73° 2199 1344 647 296 149
05-16 48° 77° 2239 1374 668 308 157
05-17 60° 74° 2284 1409 693 325 169
05-18 60° 80° 2332 1447 720 345 183
05-19 57° 87° 2382 1487 750 367 200
05-20 59° 84° 2431 1526 780 388 217
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 63° 86° 2484 1568 812 412 236
05-22 67° 85° 2537 1612 846 438 257
05-23 56° 78° 2582 1647 871 455 269
05-24 52° 80° 2626 1681 895 471 280
05-25 61° 77° 2674 1718 922 490 294
05-26 53° 78° 2717 1752 945 506 305
05-27 58° 65° 2757 1782 965 517 311
05-28 56° 70° 2797 1812 986 530 319
05-29 50° 66° 2833 1838 1002 538 322
05-30 42° 69° 2867 1862 1015 544 322
05-31 45° 77° 2906 1891 1034 554 328
06-01 52° 77° 2948 1923 1057 569 338
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 61° 71° 2993 1957 1081 585 349
06-03 52° 78° 3035 1990 1104 600 359
06-04 60° 85° 3086 2031 1134 622 376
06-05 67° 82° 3138 2073 1167 647 396
06-06 59° 76° 3184 2109 1193 665 409
06-07 58° 67° 3225 2140 1213 678 417
06-08 51° 75° 3266 2171 1234 691 425
06-09 53° 72° 3307 2202 1255 703 432
06-10 51° 68° 3344 2229 1272 713 436
06-11 44° 73° 3380 2255 1289 721 440
06-12 59° 84° 3430 2295 1318 743 456
06-13 68° 89° 3487 2341 1355 771 480
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 63° 79° 3535 2380 1384 792 496
06-15 52° 77° 3578 2413 1406 807 505
06-16 56° 85° 3626 2451 1435 827 521
06-17 68° 89° 3683 2498 1472 856 545
06-18 73° 88° 3742 2547 1510 887 570
06-19 75° 90° 3802 2597 1550 919 598
06-20 70° 86° 3858 2643 1587 947 621
06-21 66° 85° 3912 2686 1620 972 641
06-22 69° 88° 3968 2733 1656 1001 664
06-23 67° 78° 4018 2773 1687 1023 682
06-24 62° 79° 4067 2812 1716 1044 698
06-25 66° 81° 4119 2854 1748 1068 717
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 67° 79° 4170 2895 1779 1091 735
06-27 58° 72° 4213 2928 1802 1106 745
06-28 54° 72° 4255 2959 1823 1119 753
06-29 66° 86° 4308 3003 1857 1145 774
06-30 57° 79° 4351 3036 1880 1160 784
07-01 48° 74° 4390 3065 1899 1171 790
07-02 53° 78° 4434 3099 1922 1187 800
07-03 67° 84° 4488 3142 1956 1212 821
07-04 62° 82° 4537 3182 1986 1234 838
07-05 65° 79° 4588 3223 2016 1257 855
07-06 63° 77° 4636 3261 2044 1277 870
07-07 57° 82° 4683 3298 2072 1296 885
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 66° 87° 4738 3343 2107 1323 907
07-09 69° 81° 4791 3386 2139 1348 927
07-10 62° 72° 4836 3421 2164 1365 938
07-11 63° 80° 4885 3460 2194 1386 955
07-12 65° 81° 4936 3501 2225 1409 973
07-13 64° 86° 4989 3544 2258 1434 993
07-14 70° 85° 5045 3590 2293 1462 1015
07-15 70° 83° 5100 3634 2328 1488 1037
07-16 69° 85° 5154 3679 2363 1515 1059
07-17 67° 81° 5206 3721 2395 1539 1078
07-18 57° 73° 5249 3754 2417 1554 1088
07-19 55° 78° 5293 3788 2442 1570 1099
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 57° 79° 5340 3825 2468 1588 1112
07-21 62° 83° 5390 3865 2499 1611 1130
07-22 64° 80° 5440 3905 2528 1633 1146
07-23 63° 82° 5490 3945 2559 1655 1164
07-24 66° 76° 5539 3984 2587 1676 1180
07-25 61° 77° 5586 4021 2615 1695 1194
07-26 57° 79° 5632 4057 2641 1713 1207
07-27 55° 83° 5679 4094 2668 1732 1221
07-28 60° 87° 5731 4136 2700 1756 1240
07-29 72° 81° 5786 4181 2734 1783 1261
07-30 69° 83° 5840 4225 2768 1809 1282
07-31 67° 88° 5896 4271 2804 1837 1305
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 69° 88° 5952 4317 2841 1865 1329
08-02 71° 80° 6005 4360 2874 1890 1349
08-03 67° 87° 6060 4405 2909 1917 1371
08-04 65° 87° 6114 4449 2943 1943 1392
08-05 69° 82° 6168 4493 2977 1969 1413
08-06 60° 71° 6212 4527 3000 1985 1423
08-07 58° 76° 6257 4562 3026 2002 1436
08-08 59° 80° 6305 4600 3053 2022 1450
08-09 63° 76° 6353 4638 3081 2041 1465
08-10 55° 72° 6394 4669 3103 2055 1474
08-11 58° 74° 6438 4703 3127 2071 1485
08-12 53° 79° 6482 4737 3150 2087 1496
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 57° 81° 6529 4774 3177 2106 1510
08-14 58° 82° 6577 4812 3206 2126 1525
08-15 58° 80° 6624 4849 3233 2145 1539
08-16 65° 78° 6674 4889 3262 2167 1555
08-17 66° 76° 6723 4928 3291 2188 1571
08-18 66° 76° 6772 4966 3320 2208 1587
08-19 57° 69° 6812 4997 3341 2221 1595
08-20 53° 69° 6851 5026 3360 2232 1601
08-21 48° 72° 6889 5054 3378 2242 1606
08-22 48° 76° 6930 5085 3398 2255 1613
08-23 53° 79° 6974 5119 3422 2270 1624
08-24 57° 84° 7022 5157 3450 2291 1639
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 65° 87° 7076 5201 3484 2317 1661
08-26 68° 92° 7134 5249 3522 2347 1685
08-27 70° 93° 7194 5299 3562 2379 1712
08-28 71° 81° 7248 5343 3596 2405 1733
08-29 65° 78° 7298 5382 3626 2426 1750
08-30 67° 89° 7353 5428 3662 2454 1773
08-31 67° 82° 7406 5471 3694 2479 1792
09-01 61° 76° 7452 5507 3721 2497 1806
09-02 49° 70° 7490 5535 3738 2507 1810
09-03 47° 74° 7528 5563 3757 2517 1816
09-04 50° 78° 7570 5595 3779 2531 1825
09-05 54° 83° 7617 5632 3805 2550 1838
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 56° 69° 7657 5662 3825 2562 1845
09-07 48° 60° 7689 5684 3837 2565 1845
09-08 42° 69° 7722 5707 3850 2571 1846
09-09 55° 78° 7766 5741 3875 2587 1857
09-10 53° 80° 7810 5775 3899 2603 1868
09-11 56° 84° 7858 5813 3927 2623 1883
09-12 55° 84° 7906 5851 3954 2643 1898
09-13 59° 81° 7954 5889 3982 2663 1913
09-14 58° 80° 8001 5926 4010 2682 1927
09-15 59° 84° 8051 5966 4039 2704 1944
09-16 55° 81° 8097 6002 4066 2722 1957
09-17 53° 79° 8141 6036 4090 2738 1968
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 57° 80° 8188 6073 4117 2757 1982
09-19 57° 81° 8235 6110 4144 2776 1996
09-20 57° 83° 8283 6148 4172 2796 2011
09-21 61° 84° 8334 6189 4202 2818 2028
09-22 58° 80° 8381 6226 4229 2838 2043
09-23 58° 66° 8421 6256 4249 2850 2050
09-24 58° 68° 8461 6286 4270 2862 2057
09-25 62° 73° 8507 6322 4296 2880 2070
09-26 56° 71° 8549 6354 4317 2894 2079
09-27 58° 73° 8593 6387 4341 2909 2089
09-28 64° 68° 8636 6421 4365 2925 2100
09-29 64° 70° 8681 6456 4390 2942 2112
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 60° 71° 8725 6490 4413 2958 2123

 

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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