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Relative Flowering Times for Broadleaf Weeds (GDD 50)
forecast for Mon, Dec. 15. 2025

 
  

Grand Rapids, 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° 28° 2 0 0 0 0
02-16 21° 28° 4 0 0 0 0
02-17 5° 20° 4 0 0 0 0
02-18 -1° 15° 4 0 0 0 0
02-19 7° 19° 4 0 0 0 0
02-20 12° 27° 4 0 0 0 0
02-21 16° 32° 5 0 0 0 0
02-22 18° 29° 7 0 0 0 0
02-23 19° 34° 11 0 0 0 0
02-24 31° 43° 26 5 0 0 0
02-25 31° 48° 44 13 0 0 0
02-26 28° 38° 56 14 0 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 33° 41° 70 19 0 0 0
02-28 27° 49° 86 25 0 0 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 19° 31° 89 25 0 0 0
03-02 18° 30° 91 25 0 0 0
03-03 20° 39° 98 25 0 0 0
03-04 35° 52° 120 36 2 0 0
03-05 29° 52° 138 45 2 0 0
03-06 26° 34° 146 45 2 0 0
03-07 30° 38° 158 46 2 0 0
03-08 20° 39° 165 46 2 0 0
03-09 32° 53° 186 57 2 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 35° 61° 212 73 8 0 0
03-11 37° 53° 235 86 11 0 0
03-12 30° 52° 254 95 11 0 0
03-13 27° 63° 277 108 14 0 0
03-14 43° 77° 315 136 32 10 5
03-15 50° 70° 353 164 50 20 10
03-16 28° 48° 369 170 50 20 10
03-17 20° 49° 382 173 50 20 10
03-18 42° 68° 415 196 63 25 10
03-19 48° 68° 451 222 80 34 14
03-20 29° 46° 467 228 80 34 14
03-21 26° 57° 486 237 80 34 14
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 28° 49° 503 244 80 34 14
03-23 25° 47° 517 248 80 34 14
03-24 32° 40° 530 251 80 34 14
03-25 26° 39° 541 252 80 34 14
03-26 25° 46° 555 256 80 34 14
03-27 30° 52° 573 264 80 34 14
03-28 43° 69° 607 288 94 40 15
03-29 45° 65° 641 312 107 45 15
03-30 43° 68° 675 336 121 51 16
03-31 31° 40° 688 339 121 51 16
04-01 23° 42° 699 340 121 51 16
04-02 35° 60° 724 355 126 51 16
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 39° 62° 753 374 135 52 16
04-04 31° 52° 772 383 135 52 16
04-05 40° 51° 796 397 139 52 16
04-06 31° 47° 813 404 139 52 16
04-07 27° 41° 824 405 139 52 16
04-08 23° 35° 832 405 139 52 16
04-09 26° 47° 846 410 139 52 16
04-10 33° 42° 862 416 139 52 16
04-11 30° 53° 881 425 139 52 16
04-12 29° 58° 903 437 140 52 16
04-13 45° 61° 934 458 151 55 16
04-14 48° 62° 967 481 165 60 16
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 36° 48° 987 491 165 60 16
04-16 34° 49° 1007 501 165 60 16
04-17 30° 65° 1033 517 170 60 16
04-18 57° 69° 1074 548 192 74 25
04-19 42° 68° 1107 571 205 79 25
04-20 36° 58° 1132 586 210 79 25
04-21 44° 59° 1162 606 220 81 25
04-22 36° 64° 1190 624 228 81 25
04-23 45° 70° 1225 649 243 88 27
04-24 48° 79° 1267 681 265 102 36
04-25 51° 75° 1308 712 285 115 44
04-26 43° 60° 1337 731 295 116 44
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 37° 68° 1368 752 305 119 44
04-28 48° 79° 1409 783 327 132 52
04-29 48° 77° 1450 813 347 145 60
04-30 38° 62° 1477 831 355 145 60
05-01 47° 70° 1514 858 372 153 63
05-02 42° 57° 1542 876 380 153 63
05-03 40° 59° 1570 894 388 153 63
05-04 41° 63° 1600 914 398 155 63
05-05 48° 67° 1635 939 413 163 66
05-06 49° 64° 1670 964 428 169 68
05-07 44° 76° 1708 992 446 179 73
05-08 46° 60° 1739 1013 457 182 73
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 33° 65° 1766 1030 464 182 73
05-10 43° 75° 1803 1057 481 191 77
05-11 42° 74° 1839 1083 497 200 80
05-12 46° 84° 1883 1117 521 215 91
05-13 64° 73° 1929 1153 547 234 104
05-14 63° 76° 1977 1191 575 253 119
05-15 61° 85° 2028 1232 606 276 137
05-16 56° 84° 2076 1270 634 296 152
05-17 53° 63° 2111 1295 649 304 154
05-18 50° 61° 2145 1319 663 309 155
05-19 42° 55° 2172 1336 670 309 155
05-20 43° 49° 2196 1350 674 309 155
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 47° 50° 2223 1367 680 309 155
05-22 46° 57° 2252 1386 690 311 155
05-23 39° 54° 2277 1400 694 311 155
05-24 38° 61° 2304 1418 702 311 155
05-25 40° 66° 2335 1439 713 314 155
05-26 42° 72° 2370 1464 728 321 157
05-27 53° 74° 2412 1495 749 334 165
05-28 56° 65° 2450 1524 768 345 171
05-29 51° 67° 2487 1551 785 354 175
05-30 47° 69° 2523 1577 801 362 178
05-31 44° 62° 2554 1598 812 365 178
06-01 37° 66° 2583 1617 821 366 178
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 39° 78° 2620 1644 837 374 181
06-03 60° 87° 2671 1685 869 398 199
06-04 61° 78° 2719 1723 897 418 214
06-05 57° 76° 2764 1757 921 434 226
06-06 54° 79° 2808 1792 946 451 238
06-07 52° 80° 2852 1826 970 467 249
06-08 60° 78° 2900 1863 997 486 263
06-09 56° 75° 2943 1897 1021 502 273
06-10 53° 66° 2981 1924 1038 511 278
06-11 51° 84° 3026 1960 1064 528 290
06-12 63° 78° 3074 1998 1092 549 306
06-13 59° 74° 3119 2033 1117 566 317
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 55° 80° 3165 2069 1143 583 330
06-15 57° 81° 3212 2106 1169 602 344
06-16 61° 85° 3262 2146 1200 625 362
06-17 66° 88° 3317 2191 1235 652 384
06-18 68° 82° 3370 2234 1268 677 404
06-19 63° 77° 3418 2272 1296 697 419
06-20 61° 81° 3467 2311 1325 718 435
06-21 74° 94° 3529 2363 1367 752 464
06-22 80° 94° 3594 2418 1412 789 495
06-23 78° 95° 3658 2472 1456 825 527
06-24 71° 92° 3718 2522 1496 857 554
06-25 72° 79° 3772 2566 1530 883 574
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 67° 91° 3829 2613 1567 912 599
06-27 71° 89° 3887 2661 1605 942 623
06-28 65° 81° 3938 2702 1636 965 642
06-29 61° 91° 3992 2746 1670 991 663
06-30 72° 84° 4048 2792 1706 1019 686
07-01 65° 82° 4100 2834 1738 1043 704
07-02 64° 87° 4153 2877 1771 1068 725
07-03 64° 87° 4207 2921 1805 1094 745
07-04 66° 88° 4262 2966 1840 1121 767
07-05 72° 92° 4321 3015 1879 1152 794
07-06 71° 83° 4377 3060 1914 1179 816
07-07 64° 81° 4427 3101 1945 1202 834
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 59° 84° 4477 3141 1975 1224 850
07-09 68° 83° 4530 3184 2008 1249 871
07-10 60° 84° 4580 3224 2038 1271 888
07-11 65° 81° 4631 3265 2069 1294 906
07-12 72° 82° 4686 3310 2104 1321 928
07-13 66° 83° 4739 3353 2137 1345 947
07-14 59° 85° 4789 3393 2167 1368 964
07-15 58° 90° 4841 3435 2199 1392 984
07-16 71° 86° 4897 3481 2235 1420 1007
07-17 60° 74° 4943 3516 2260 1437 1019
07-18 54° 80° 4988 3552 2286 1454 1031
07-19 64° 81° 5038 3592 2316 1477 1048
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 67° 80° 5089 3633 2347 1500 1066
07-21 56° 83° 5136 3670 2374 1519 1081
07-22 61° 85° 5187 3711 2405 1542 1099
07-23 62° 92° 5243 3756 2440 1569 1121
07-24 74° 92° 5304 3807 2481 1602 1149
07-25 72° 82° 5359 3853 2517 1629 1171
07-26 71° 83° 5414 3898 2551 1656 1193
07-27 71° 92° 5473 3947 2591 1688 1220
07-28 70° 88° 5531 3994 2628 1717 1244
07-29 66° 91° 5587 4041 2665 1746 1267
07-30 64° 83° 5638 4082 2696 1769 1286
07-31 59° 77° 5684 4118 2722 1787 1299
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 56° 78° 5730 4154 2747 1804 1311
08-02 51° 80° 5773 4187 2771 1820 1321
08-03 55° 82° 5819 4223 2797 1838 1335
08-04 57° 82° 5867 4261 2825 1857 1349
08-05 61° 84° 5917 4301 2855 1880 1366
08-06 61° 86° 5969 4343 2887 1903 1385
08-07 66° 89° 6024 4388 2922 1931 1407
08-08 71° 90° 6083 4437 2960 1961 1433
08-09 70° 92° 6142 4486 2999 1992 1459
08-10 69° 91° 6200 4534 3038 2022 1484
08-11 72° 84° 6255 4579 3073 2050 1507
08-12 69° 85° 6310 4624 3108 2077 1529
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 69° 83° 6364 4668 3142 2103 1550
08-14 61° 83° 6415 4708 3172 2125 1567
08-15 65° 88° 6469 4753 3207 2152 1588
08-16 70° 89° 6527 4801 3244 2181 1613
08-17 67° 85° 6581 4845 3278 2207 1634
08-18 60° 84° 6630 4884 3308 2229 1651
08-19 66° 76° 6679 4923 3337 2250 1666
08-20 63° 76° 6727 4961 3364 2269 1681
08-21 59° 79° 6774 4998 3392 2289 1695
08-22 57° 80° 6820 5034 3418 2307 1709
08-23 62° 79° 6869 5073 3447 2328 1724
08-24 55° 70° 6910 5104 3468 2340 1732
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 54° 68° 6949 5133 3487 2352 1738
08-26 46° 70° 6985 5159 3502 2359 1741
08-27 43° 74° 7021 5185 3519 2368 1745
08-28 56° 75° 7065 5219 3543 2384 1756
08-29 44° 67° 7099 5243 3557 2390 1756
08-30 42° 73° 7135 5269 3573 2398 1759
08-31 46° 77° 7174 5298 3592 2409 1766
09-01 50° 78° 7216 5330 3614 2423 1775
09-02 51° 79° 7259 5363 3637 2438 1785
09-03 55° 68° 7299 5393 3657 2450 1791
09-04 47° 62° 7331 5415 3669 2454 1791
09-05 52° 63° 7367 5440 3684 2461 1793
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 49° 60° 7400 5463 3697 2466 1793
09-07 42° 65° 7431 5485 3709 2470 1793
09-08 38° 68° 7462 5506 3720 2473 1793
09-09 43° 73° 7498 5532 3736 2481 1797
09-10 50° 78° 7541 5565 3758 2495 1806
09-11 53° 80° 7585 5599 3783 2512 1817
09-12 52° 81° 7629 5633 3807 2528 1828
09-13 56° 76° 7673 5667 3831 2544 1839
09-14 58° 84° 7722 5706 3860 2565 1855
09-15 56° 84° 7770 5744 3888 2585 1870
09-16 55° 81° 7816 5780 3914 2603 1883
09-17 51° 84° 7861 5815 3939 2620 1896
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 56° 85° 7910 5854 3968 2641 1912
09-19 61° 85° 7961 5895 3999 2664 1930
09-20 57° 81° 8008 5932 4026 2683 1944
09-21 60° 75° 8054 5968 4052 2701 1956
09-22 63° 78° 8102 6006 4080 2721 1972
09-23 62° 73° 8148 6042 4106 2739 1984
09-24 59° 71° 8191 6075 4129 2754 1994
09-25 57° 71° 8233 6107 4151 2768 2003
09-26 54° 77° 8277 6141 4175 2784 2014
09-27 54° 81° 8322 6176 4200 2801 2027
09-28 56° 78° 8368 6211 4225 2818 2039
09-29 49° 82° 8411 6245 4249 2834 2049
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 51° 81° 8455 6279 4273 2850 2060
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 30° 36° 11 1 0 0 0
02-16 22° 29° 14 1 0 0 0
02-17 17° 27° 14 1 0 0 0
02-18 24° 33° 20 1 0 0 0
02-19 16° 41° 27 1 0 0 0
02-20 28° 52° 45 9 0 0 0
02-21 39° 62° 73 27 8 0 0
02-22 33° 56° 95 39 10 0 0
02-23 26° 44° 108 42 10 0 0
02-24 14° 31° 109 42 10 0 0
02-25 26° 47° 123 47 10 0 0
02-26 32° 61° 148 61 15 0 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 53° 74° 189 93 36 14 8
02-28 21° 58° 207 100 36 14 8
02-29 19° 34° 211 100 36 14 8
03-01 27° 47° 226 105 36 14 8
03-02 39° 54° 251 120 41 14 8
03-03 39° 66° 281 140 51 16 8
03-04 51° 69° 320 168 70 26 13
03-05 44° 63° 351 190 81 30 13
03-06 35° 52° 373 202 83 30 13
03-07 32° 48° 391 210 83 30 13
03-08 38° 47° 412 221 84 30 13
03-09 32° 45° 429 227 84 30 13
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 30° 37° 440 229 84 30 13
03-11 28° 60° 462 241 86 30 13
03-12 43° 68° 496 265 99 35 14
03-13 43° 70° 530 289 113 42 15
03-14 43° 56° 557 306 121 42 15
03-15 34° 50° 577 316 121 42 15
03-16 32° 53° 598 326 121 42 15
03-17 28° 38° 609 327 121 42 15
03-18 24° 33° 615 327 121 42 15
03-19 30° 44° 630 332 121 42 15
03-20 23° 36° 637 332 121 42 15
03-21 17° 35° 641 332 121 42 15
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 26° 31° 648 332 121 42 15
03-23 26° 35° 657 332 121 42 15
03-24 25° 40° 667 333 121 42 15
03-25 33° 65° 694 350 128 42 15
03-26 40° 62° 723 369 137 43 15
03-27 32° 38° 736 372 137 43 15
03-28 28° 43° 749 375 137 43 15
03-29 24° 50° 764 380 137 43 15
03-30 35° 45° 782 388 137 43 15
03-31 37° 46° 802 397 137 43 15
04-01 35° 53° 824 410 139 43 15
04-02 38° 47° 845 420 140 43 15
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 35° 42° 861 427 140 43 15
04-04 36° 45° 880 435 140 43 15
04-05 35° 49° 900 445 140 43 15
04-06 30° 56° 921 457 141 43 15
04-07 33° 60° 945 471 145 43 15
04-08 44° 71° 981 496 161 50 17
04-09 48° 65° 1015 521 175 56 19
04-10 38° 67° 1045 541 185 59 19
04-11 48° 55° 1075 560 194 60 19
04-12 45° 56° 1103 579 203 60 19
04-13 40° 58° 1130 596 210 60 19
04-14 51° 75° 1171 627 231 73 27
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 47° 68° 1207 653 247 81 29
04-16 46° 69° 1242 678 262 89 32
04-17 57° 69° 1283 709 283 101 40
04-18 48° 54° 1313 728 293 103 40
04-19 42° 52° 1338 743 297 103 40
04-20 36° 45° 1356 751 297 103 40
04-21 34° 48° 1374 760 297 103 40
04-22 35° 63° 1402 777 305 103 40
04-23 48° 62° 1435 801 318 108 40
04-24 37° 53° 1458 813 321 108 40
04-25 29° 58° 1479 825 322 108 40
04-26 36° 65° 1508 844 331 109 40
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 54° 79° 1553 879 356 126 52
04-28 62° 77° 1601 916 384 145 66
04-29 57° 69° 1642 947 405 158 74
04-30 47° 64° 1675 971 418 163 74
05-01 52° 72° 1715 1001 438 176 82
05-02 49° 77° 1757 1032 460 189 90
05-03 56° 70° 1798 1063 481 202 98
05-04 51° 78° 1841 1096 504 217 108
05-05 53° 69° 1880 1125 523 228 114
05-06 48° 71° 1917 1153 540 238 119
05-07 52° 68° 1955 1181 558 248 124
05-08 50° 72° 1994 1210 577 259 130
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 52° 59° 2028 1234 591 264 130
05-10 45° 65° 2061 1256 604 269 130
05-11 49° 60° 2093 1279 616 274 130
05-12 40° 76° 2129 1305 632 282 134
05-13 63° 80° 2179 1344 662 303 150
05-14 56° 63° 2217 1372 680 313 155
05-15 51° 75° 2257 1403 700 326 162
05-16 48° 75° 2297 1432 720 337 169
05-17 59° 78° 2343 1469 746 356 182
05-18 50° 84° 2388 1504 771 373 194
05-19 59° 84° 2438 1543 801 394 211
05-20 52° 83° 2483 1579 826 412 223
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 57° 86° 2533 1618 856 433 240
05-22 62° 79° 2581 1657 884 454 255
05-23 55° 76° 2625 1690 908 469 266
05-24 51° 81° 2669 1724 932 485 277
05-25 55° 71° 2710 1756 953 499 285
05-26 51° 77° 2752 1788 975 513 294
05-27 55° 65° 2790 1816 993 523 299
05-28 53° 68° 2829 1844 1012 533 305
05-29 55° 71° 2869 1875 1032 546 312
05-30 45° 73° 2906 1902 1049 555 316
05-31 46° 79° 2946 1932 1069 567 324
06-01 55° 76° 2990 1965 1093 582 334
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 59° 75° 3035 2000 1118 599 346
06-03 53° 83° 3081 2036 1144 617 359
06-04 66° 85° 3135 2080 1178 643 380
06-05 63° 76° 3182 2118 1205 663 394
06-06 59° 72° 3226 2151 1229 678 405
06-07 58° 70° 3267 2183 1250 692 414
06-08 52° 71° 3307 2212 1270 703 420
06-09 52° 75° 3348 2244 1291 717 428
06-10 51° 71° 3387 2273 1310 727 434
06-11 43° 72° 3423 2298 1326 735 437
06-12 59° 84° 3472 2338 1355 757 453
06-13 70° 85° 3528 2383 1391 784 476
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 62° 82° 3578 2423 1421 806 493
06-15 57° 82° 3625 2461 1448 826 507
06-16 64° 89° 3680 2506 1483 853 529
06-17 70° 92° 3739 2555 1522 884 555
06-18 77° 90° 3801 2606 1564 917 584
06-19 77° 92° 3863 2659 1606 952 613
06-20 72° 86° 3920 2706 1643 981 637
06-21 70° 88° 3977 2753 1680 1009 661
06-22 72° 85° 4034 2799 1717 1038 685
06-23 65° 76° 4082 2838 1745 1059 700
06-24 57° 80° 4129 2875 1772 1078 714
06-25 66° 80° 4180 2916 1803 1101 732
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 67° 81° 4232 2958 1835 1125 751
06-27 55° 72° 4274 2989 1857 1138 760
06-28 61° 72° 4318 3024 1881 1155 771
06-29 67° 81° 4370 3066 1913 1179 790
06-30 57° 75° 4413 3099 1936 1194 800
07-01 46° 76° 4452 3128 1955 1205 806
07-02 55° 74° 4495 3161 1978 1219 816
07-03 70° 82° 4549 3204 2012 1245 837
07-04 65° 83° 4601 3246 2044 1269 856
07-05 63° 81° 4651 3286 2074 1291 873
07-06 63° 74° 4697 3323 2100 1310 886
07-07 56° 84° 4746 3361 2129 1330 902
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 67° 85° 4800 3405 2163 1356 923
07-09 67° 84° 4854 3449 2197 1382 944
07-10 67° 75° 4903 3488 2226 1403 960
07-11 61° 81° 4952 3527 2255 1424 976
07-12 64° 84° 5004 3569 2287 1448 995
07-13 62° 88° 5056 3612 2319 1473 1014
07-14 69° 87° 5112 3657 2355 1500 1037
07-15 68° 85° 5166 3702 2389 1527 1059
07-16 67° 79° 5218 3743 2421 1550 1077
07-17 64° 79° 5267 3783 2450 1571 1093
07-18 55° 73° 5309 3815 2472 1586 1102
07-19 51° 80° 5353 3848 2496 1601 1113
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 55° 80° 5398 3884 2521 1619 1126
07-21 59° 83° 5447 3923 2550 1640 1141
07-22 62° 82° 5497 3963 2580 1662 1159
07-23 58° 83° 5546 4001 2609 1682 1174
07-24 64° 76° 5594 4040 2637 1703 1189
07-25 55° 78° 5638 4074 2661 1719 1201
07-26 54° 82° 5684 4110 2687 1737 1213
07-27 57° 84° 5733 4149 2716 1758 1229
07-28 59° 87° 5784 4190 2747 1781 1247
07-29 71° 86° 5841 4236 2784 1809 1271
07-30 69° 83° 5895 4280 2818 1835 1292
07-31 67° 85° 5949 4325 2852 1861 1313
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 68° 86° 6004 4370 2887 1888 1335
08-02 70° 87° 6061 4416 2924 1917 1359
08-03 66° 89° 6116 4462 2959 1945 1381
08-04 63° 88° 6170 4505 2993 1970 1402
08-05 69° 81° 6223 4548 3026 1995 1422
08-06 60° 72° 6267 4583 3050 2012 1433
08-07 57° 79° 6313 4618 3076 2029 1446
08-08 56° 80° 6359 4654 3102 2047 1459
08-09 61° 72° 6403 4689 3126 2064 1470
08-10 56° 70° 6444 4720 3147 2076 1478
08-11 57° 75° 6488 4754 3171 2093 1489
08-12 56° 79° 6534 4790 3197 2111 1502
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 56° 83° 6582 4827 3225 2130 1517
08-14 57° 84° 6630 4866 3253 2151 1532
08-15 62° 78° 6678 4904 3281 2171 1547
08-16 66° 82° 6730 4946 3313 2195 1566
08-17 67° 76° 6780 4985 3343 2216 1583
08-18 67° 76° 6829 5025 3372 2238 1600
08-19 57° 73° 6873 5058 3396 2253 1610
08-20 49° 70° 6911 5086 3414 2263 1615
08-21 47° 74° 6949 5115 3432 2274 1620
08-22 49° 75° 6989 5145 3452 2286 1627
08-23 52° 78° 7032 5178 3475 2301 1638
08-24 57° 84° 7081 5217 3504 2322 1653
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 67° 89° 7137 5263 3540 2349 1676
08-26 73° 91° 7197 5313 3580 2382 1703
08-27 74° 90° 7257 5363 3620 2414 1730
08-28 70° 81° 7311 5406 3654 2439 1751
08-29 66° 82° 7363 5448 3686 2463 1770
08-30 70° 82° 7417 5492 3720 2489 1791
08-31 59° 81° 7465 5530 3748 2509 1806
09-01 58° 76° 7510 5565 3773 2526 1818
09-02 47° 73° 7548 5593 3791 2536 1823
09-03 49° 76° 7588 5624 3811 2549 1830
09-04 49° 81° 7631 5656 3834 2563 1840
09-05 55° 83° 7678 5693 3861 2582 1854
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 54° 68° 7716 5722 3879 2593 1859
09-07 46° 62° 7748 5744 3891 2597 1859
09-08 41° 69° 7781 5767 3904 2602 1859
09-09 57° 76° 7826 5801 3929 2618 1871
09-10 51° 80° 7869 5835 3952 2634 1882
09-11 52° 85° 7916 5871 3979 2652 1895
09-12 52° 86° 7963 5908 4006 2671 1909
09-13 58° 85° 8012 5948 4035 2693 1926
09-14 58° 87° 8063 5988 4066 2715 1943
09-15 58° 88° 8114 6030 4097 2739 1961
09-16 56° 87° 8164 6069 4127 2760 1978
09-17 53° 84° 8210 6106 4153 2779 1991
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 52° 84° 8256 6141 4179 2796 2004
09-19 55° 85° 8304 6179 4207 2816 2019
09-20 63° 81° 8354 6219 4237 2838 2036
09-21 60° 85° 8404 6260 4267 2861 2053
09-22 64° 71° 8450 6295 4293 2878 2066
09-23 54° 67° 8488 6324 4311 2889 2071
09-24 57° 68° 8528 6354 4331 2901 2079
09-25 56° 73° 8571 6386 4354 2915 2088
09-26 49° 76° 8611 6417 4374 2928 2095
09-27 55° 76° 8655 6450 4398 2943 2106
09-28 62° 78° 8703 6488 4426 2963 2121
09-29 63° 82° 8753 6528 4456 2985 2138
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 57° 78° 8798 6564 4481 3003 2151

 

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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