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Relative Flowering Times for Broadleaf Weeds (GDD 50)
through Thu, Dec. 11. 2025

 
  

Hart, 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 20° 27° 1 0 0 0 0
02-16 20° 27° 3 0 0 0 0
02-17 10° 18° 3 0 0 0 0
02-18 8° 16° 3 0 0 0 0
02-19 12° 18° 3 0 0 0 0
02-20 18° 27° 4 0 0 0 0
02-21 15° 30° 4 0 0 0 0
02-22 23° 29° 8 0 0 0 0
02-23 25° 34° 16 0 0 0 0
02-24 32° 42° 32 5 0 0 0
02-25 33° 42° 47 11 0 0 0
02-26 31° 41° 61 15 0 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 33° 38° 75 18 0 0 0
02-28 30° 44° 90 24 0 0 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 17° 28° 90 24 0 0 0
03-02 21° 27° 92 24 0 0 0
03-03 22° 40° 101 24 0 0 0
03-04 37° 45° 120 32 0 0 0
03-05 25° 46° 134 36 0 0 0
03-06 25° 34° 141 36 0 0 0
03-07 28° 37° 152 37 0 0 0
03-08 21° 38° 159 37 0 0 0
03-09 33° 47° 177 45 0 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 34° 54° 199 56 2 0 0
03-11 34° 52° 220 67 3 0 0
03-12 31° 49° 238 75 3 0 0
03-13 26° 54° 256 83 3 0 0
03-14 44° 72° 292 109 19 8 3
03-15 43° 66° 324 132 31 13 3
03-16 26° 42° 337 134 31 13 3
03-17 19° 46° 347 135 31 13 3
03-18 42° 57° 375 152 39 13 3
03-19 37° 55° 399 167 43 13 3
03-20 30° 36° 410 167 43 13 3
03-21 29° 48° 426 174 43 13 3
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 25° 44° 439 176 43 13 3
03-23 24° 46° 452 179 43 13 3
03-24 31° 36° 463 181 43 13 3
03-25 31° 36° 475 182 43 13 3
03-26 25° 40° 486 183 43 13 3
03-27 29° 47° 502 189 43 13 3
03-28 39° 61° 529 207 51 13 3
03-29 40° 50° 553 220 54 13 3
03-30 36° 50° 574 231 55 13 3
03-31 31° 35° 585 233 55 13 3
04-01 23° 42° 595 233 55 13 3
04-02 31° 53° 615 242 55 13 3
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 37° 53° 638 256 58 13 3
04-04 31° 48° 656 263 58 13 3
04-05 38° 45° 675 273 58 13 3
04-06 29° 41° 689 276 58 13 3
04-07 28° 40° 700 278 58 13 3
04-08 26° 34° 708 278 58 13 3
04-09 28° 44° 723 282 58 13 3
04-10 35° 43° 739 289 58 13 3
04-11 29° 48° 756 296 58 13 3
04-12 27° 50° 773 302 58 13 3
04-13 44° 59° 802 321 68 14 3
04-14 45° 54° 829 339 75 14 3
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 34° 45° 847 346 75 14 3
04-16 34° 43° 863 353 75 14 3
04-17 31° 61° 887 367 79 14 3
04-18 48° 62° 920 390 92 19 3
04-19 39° 52° 944 403 96 19 3
04-20 34° 56° 967 416 99 19 3
04-21 44° 52° 993 433 105 19 3
04-22 35° 54° 1016 445 108 19 3
04-23 42° 63° 1046 466 118 22 3
04-24 48° 69° 1083 493 135 30 7
04-25 43° 56° 1111 510 143 30 7
04-26 40° 51° 1134 523 146 30 7
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 33° 57° 1157 536 149 30 7
04-28 48° 72° 1195 565 167 41 12
04-29 43° 69° 1229 589 181 47 13
04-30 32° 56° 1251 601 183 47 13
05-01 40° 54° 1276 616 188 47 13
05-02 40° 47° 1298 628 190 47 13
05-03 38° 50° 1320 640 192 47 13
05-04 37° 65° 1349 659 201 47 13
05-05 47° 59° 1380 680 212 51 13
05-06 46° 64° 1413 703 225 55 13
05-07 43° 61° 1443 723 235 57 13
05-08 42° 56° 1470 740 242 57 13
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 34° 53° 1492 751 244 57 13
05-10 43° 57° 1520 770 252 58 13
05-11 38° 63° 1549 788 261 58 13
05-12 46° 75° 1587 817 279 69 19
05-13 59° 66° 1628 848 300 81 26
05-14 59° 67° 1669 879 321 94 34
05-15 57° 79° 1715 915 347 113 48
05-16 51° 77° 1757 947 369 127 57
05-17 48° 57° 1788 967 380 129 57
05-18 42° 52° 1812 982 384 129 57
05-19 39° 56° 1838 997 390 129 57
05-20 45° 51° 1863 1013 395 129 57
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 46° 48° 1889 1028 401 129 57
05-22 43° 51° 1914 1044 406 129 57
05-23 41° 51° 1938 1057 410 129 57
05-24 39° 55° 1963 1072 415 129 57
05-25 39° 59° 1990 1089 422 129 57
05-26 41° 63° 2019 1109 431 131 57
05-27 50° 72° 2058 1138 450 142 63
05-28 50° 69° 2096 1165 468 151 67
05-29 49° 60° 2128 1188 480 156 67
05-30 49° 62° 2162 1211 494 161 67
05-31 44° 56° 2190 1230 502 161 67
06-01 36° 59° 2215 1245 507 161 67
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 42° 66° 2248 1268 520 166 67
06-03 60° 76° 2294 1303 546 184 80
06-04 53° 64° 2330 1330 562 192 83
06-05 53° 71° 2370 1359 582 204 90
06-06 55° 73° 2412 1392 604 218 100
06-07 53° 72° 2453 1422 625 230 107
06-08 54° 68° 2492 1452 644 242 113
06-09 51° 62° 2526 1476 658 248 115
06-10 53° 61° 2562 1501 674 255 117
06-11 52° 72° 2602 1532 694 268 124
06-12 59° 73° 2646 1566 718 284 135
06-13 59° 73° 2690 1599 742 299 146
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 54° 72° 2730 1630 762 312 154
06-15 58° 72° 2773 1663 785 327 164
06-16 61° 75° 2819 1699 811 345 176
06-17 65° 76° 2868 1737 840 366 192
06-18 64° 71° 2913 1773 865 383 205
06-19 60° 70° 2956 1806 888 398 215
06-20 60° 74° 3001 1841 913 415 227
06-21 70° 79° 3054 1884 946 440 247
06-22 72° 81° 3108 1928 980 466 268
06-23 69° 80° 3161 1970 1013 491 287
06-24 65° 77° 3210 2010 1042 512 303
06-25 67° 76° 3260 2049 1072 533 320
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 67° 77° 3310 2089 1102 556 337
06-27 68° 77° 3360 2130 1132 578 355
06-28 63° 71° 3405 2165 1157 595 366
06-29 62° 81° 3454 2204 1186 616 383
06-30 69° 75° 3504 2244 1216 638 400
07-01 64° 74° 3551 2281 1243 657 414
07-02 65° 77° 3600 2320 1272 678 430
07-03 64° 78° 3650 2359 1302 699 446
07-04 65° 77° 3699 2398 1331 721 462
07-05 71° 83° 3754 2444 1366 748 484
07-06 65° 76° 3802 2482 1394 768 500
07-07 62° 71° 3847 2517 1419 785 511
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 56° 77° 3891 2551 1443 801 523
07-09 64° 75° 3939 2589 1471 821 537
07-10 57° 76° 3983 2623 1495 837 549
07-11 65° 74° 4031 2661 1523 857 563
07-12 69° 75° 4081 2700 1553 878 580
07-13 63° 73° 4127 2737 1579 897 593
07-14 62° 76° 4174 2774 1606 916 608
07-15 64° 80° 4224 2814 1636 938 625
07-16 70° 81° 4278 2857 1670 963 645
07-17 58° 71° 4320 2890 1692 978 655
07-18 53° 72° 4361 2920 1713 990 662
07-19 60° 77° 4407 2957 1739 1009 676
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 63° 75° 4454 2994 1766 1028 690
07-21 55° 74° 4497 3026 1789 1043 699
07-22 60° 76° 4543 3063 1815 1061 713
07-23 65° 83° 4595 3105 1847 1085 732
07-24 72° 78° 4648 3148 1880 1110 752
07-25 67° 82° 4701 3191 1913 1135 771
07-26 70° 74° 4751 3231 1943 1157 789
07-27 68° 83° 4805 3274 1977 1182 809
07-28 67° 83° 4858 3317 2010 1207 829
07-29 63° 81° 4908 3358 2040 1230 846
07-30 62° 74° 4954 3394 2066 1248 859
07-31 59° 75° 4999 3429 2091 1265 872
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 56° 73° 5041 3461 2113 1279 881
08-02 52° 74° 5082 3492 2134 1292 889
08-03 55° 76° 5126 3526 2158 1308 900
08-04 60° 78° 5173 3563 2185 1327 914
08-05 61° 80° 5222 3602 2214 1348 929
08-06 62° 79° 5270 3640 2242 1368 945
08-07 64° 82° 5322 3681 2274 1391 963
08-08 71° 84° 5377 3727 2309 1419 985
08-09 72° 84° 5433 3773 2345 1447 1009
08-10 70° 81° 5486 3816 2378 1472 1029
08-11 70° 77° 5538 3858 2410 1496 1048
08-12 69° 74° 5588 3897 2440 1517 1064
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 66° 78° 5637 3937 2469 1539 1081
08-14 59° 78° 5684 3974 2496 1558 1095
08-15 66° 80° 5735 4015 2527 1581 1113
08-16 71° 82° 5789 4059 2561 1607 1134
08-17 68° 78° 5840 4100 2592 1630 1152
08-18 62° 74° 5886 4136 2618 1648 1165
08-19 67° 72° 5934 4173 2646 1668 1179
08-20 63° 75° 5981 4210 2673 1687 1193
08-21 57° 76° 6025 4245 2697 1703 1205
08-22 60° 75° 6071 4280 2723 1720 1217
08-23 64° 72° 6117 4317 2749 1739 1231
08-24 59° 68° 6159 4349 2771 1753 1239
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 57° 65° 6198 4378 2790 1764 1245
08-26 52° 67° 6235 4405 2807 1773 1250
08-27 49° 71° 6273 4433 2825 1783 1254
08-28 55° 69° 6313 4463 2845 1795 1262
08-29 45° 64° 6346 4485 2858 1800 1262
08-30 45° 68° 6380 4510 2872 1806 1263
08-31 47° 71° 6417 4537 2889 1815 1267
09-01 52° 73° 6457 4567 2909 1827 1274
09-02 54° 73° 6499 4599 2931 1841 1283
09-03 57° 66° 6538 4628 2950 1852 1289
09-04 48° 61° 6571 4650 2963 1857 1289
09-05 54° 61° 6606 4676 2978 1864 1292
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 50° 58° 6639 4698 2991 1868 1292
09-07 48° 60° 6671 4720 3003 1872 1292
09-08 43° 65° 6703 4742 3015 1876 1292
09-09 51° 69° 6741 4770 3033 1886 1297
09-10 53° 71° 6780 4800 3052 1898 1304
09-11 53° 73° 6821 4831 3073 1911 1311
09-12 53° 73° 6862 4862 3094 1924 1320
09-13 59° 74° 6907 4897 3119 1941 1331
09-14 57° 79° 6953 4933 3145 1959 1344
09-15 57° 78° 6999 4969 3171 1977 1357
09-16 56° 76° 7043 5003 3195 1993 1368
09-17 56° 76° 7087 5036 3219 2008 1379
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 59° 76° 7132 5072 3244 2026 1391
09-19 62° 80° 7181 5111 3273 2047 1407
09-20 59° 77° 7228 5147 3300 2065 1421
09-21 61° 72° 7272 5182 3324 2082 1432
09-22 62° 72° 7317 5217 3349 2099 1444
09-23 60° 71° 7361 5250 3373 2115 1455
09-24 57° 69° 7402 5281 3394 2128 1463
09-25 58° 68° 7443 5312 3415 2140 1471
09-26 56° 70° 7484 5344 3436 2154 1479
09-27 53° 74° 7526 5375 3458 2168 1488
09-28 52° 72° 7566 5406 3478 2180 1495
09-29 49° 76° 7607 5436 3499 2192 1503
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 53° 78° 7650 5470 3522 2208 1513
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 29° 36° 10 0 0 0 0
02-16 23° 30° 15 0 0 0 0
02-17 16° 30° 16 0 0 0 0
02-18 25° 32° 22 0 0 0 0
02-19 19° 39° 29 0 0 0 0
02-20 24° 47° 42 4 0 0 0
02-21 35° 51° 63 15 1 0 0
02-22 30° 53° 83 24 1 0 0
02-23 19° 37° 89 24 1 0 0
02-24 12° 30° 89 24 1 0 0
02-25 31° 44° 105 30 1 0 0
02-26 27° 55° 124 38 1 0 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 51° 57° 156 61 13 4 0
02-28 18° 51° 168 63 13 4 0
02-29 17° 32° 170 63 13 4 0
03-01 30° 45° 186 68 13 4 0
03-02 37° 48° 206 79 14 4 0
03-03 39° 65° 237 99 24 7 0
03-04 45° 59° 267 119 34 9 0
03-05 39° 46° 287 130 35 9 0
03-06 35° 53° 309 141 36 9 0
03-07 28° 46° 324 147 36 9 0
03-08 36° 44° 342 155 36 9 0
03-09 31° 40° 356 158 36 9 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 30° 38° 368 160 36 9 0
03-11 29° 50° 385 168 36 9 0
03-12 39° 55° 410 183 41 9 0
03-13 34° 61° 436 198 47 9 0
03-14 39° 52° 459 212 50 9 0
03-15 32° 43° 475 217 50 9 0
03-16 33° 47° 493 226 50 9 0
03-17 26° 37° 502 226 50 9 0
03-18 24° 33° 509 226 50 9 0
03-19 32° 42° 524 231 50 9 0
03-20 24° 34° 531 231 50 9 0
03-21 19° 31° 535 231 50 9 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 24° 33° 541 231 50 9 0
03-23 25° 34° 549 231 50 9 0
03-24 23° 38° 557 231 50 9 0
03-25 35° 60° 583 246 56 9 0
03-26 37° 58° 608 262 61 9 0
03-27 30° 37° 620 263 61 9 0
03-28 30° 38° 632 265 61 9 0
03-29 27° 43° 645 269 61 9 0
03-30 32° 40° 659 273 61 9 0
03-31 30° 42° 674 277 61 9 0
04-01 34° 50° 693 287 61 9 0
04-02 37° 42° 711 294 61 9 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 35° 41° 727 301 61 9 0
04-04 35° 42° 744 307 61 9 0
04-05 34° 45° 761 315 61 9 0
04-06 30° 50° 779 323 61 9 0
04-07 34° 56° 802 336 64 9 0
04-08 44° 60° 833 356 74 11 0
04-09 44° 55° 860 374 82 11 0
04-10 38° 59° 887 391 89 11 0
04-11 44° 55° 914 408 96 11 0
04-12 43° 53° 940 424 102 11 0
04-13 40° 54° 965 439 107 11 0
04-14 50° 68° 1002 466 124 20 4
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 41° 57° 1029 483 131 20 4
04-16 43° 65° 1061 505 143 24 4
04-17 50° 56° 1092 526 154 27 4
04-18 45° 51° 1118 542 160 27 4
04-19 39° 47° 1139 553 161 27 4
04-20 36° 42° 1156 560 161 27 4
04-21 35° 45° 1174 568 161 27 4
04-22 35° 56° 1198 581 165 27 4
04-23 39° 56° 1223 597 170 27 4
04-24 34° 45° 1241 604 170 27 4
04-25 28° 51° 1258 612 170 27 4
04-26 36° 62° 1285 628 177 27 4
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 54° 68° 1323 657 196 37 10
04-28 52° 64° 1359 683 212 45 13
04-29 53° 60° 1394 707 226 52 14
04-30 47° 55° 1422 726 235 52 14
05-01 49° 60° 1455 749 248 57 14
05-02 46° 69° 1491 775 263 65 17
05-03 51° 63° 1526 799 278 72 19
05-04 46° 70° 1562 825 294 80 21
05-05 48° 58° 1592 846 305 82 21
05-06 46° 67° 1627 870 319 89 23
05-07 48° 64° 1660 894 333 94 23
05-08 48° 63° 1694 918 347 100 24
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 49° 60° 1727 941 359 105 24
05-10 42° 57° 1755 959 367 105 24
05-11 45° 56° 1784 977 376 106 24
05-12 40° 69° 1816 1000 389 110 24
05-13 53° 61° 1852 1025 404 118 27
05-14 51° 61° 1886 1050 418 124 28
05-15 48° 64° 1920 1073 432 130 29
05-16 47° 69° 1956 1099 448 138 32
05-17 54° 68° 1995 1128 467 149 37
05-18 48° 74° 2034 1157 486 160 43
05-19 58° 72° 2076 1190 509 174 53
05-20 53° 71° 2116 1220 529 186 60
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 52° 80° 2161 1254 553 203 72
05-22 57° 76° 2205 1289 578 219 83
05-23 53° 69° 2244 1318 596 230 89
05-24 51° 75° 2285 1349 618 243 97
05-25 52° 63° 2321 1374 633 251 99
05-26 51° 71° 2360 1403 652 262 105
05-27 51° 62° 2394 1428 667 268 107
05-28 52° 62° 2429 1452 681 275 109
05-29 50° 62° 2463 1477 695 281 110
05-30 40° 63° 2492 1496 705 282 110
05-31 45° 69° 2527 1521 720 289 112
06-01 54° 70° 2568 1551 740 302 119
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 55° 66° 2607 1580 759 313 125
06-03 52° 74° 2648 1612 780 326 134
06-04 66° 78° 2698 1652 811 348 151
06-05 62° 73° 2744 1687 836 366 163
06-06 57° 65° 2782 1716 855 376 169
06-07 56° 64° 2821 1745 873 387 175
06-08 53° 65° 2857 1771 890 395 178
06-09 51° 67° 2894 1798 907 404 182
06-10 49° 60° 2927 1821 919 409 182
06-11 42° 64° 2958 1842 931 412 182
06-12 58° 74° 3002 1876 955 428 193
06-13 62° 73° 3048 1911 980 446 206
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 57° 74° 3091 1945 1004 461 216
06-15 53° 76° 3134 1978 1026 476 226
06-16 64° 81° 3184 2018 1057 498 243
06-17 68° 84° 3239 2062 1091 525 265
06-18 71° 82° 3293 2107 1126 551 286
06-19 70° 81° 3347 2150 1159 577 307
06-20 67° 78° 3397 2191 1190 599 324
06-21 66° 75° 3446 2230 1218 620 340
06-22 67° 72° 3493 2267 1246 639 354
06-23 61° 69° 3537 2301 1269 655 365
06-24 58° 72° 3580 2334 1293 670 375
06-25 67° 75° 3629 2373 1322 691 391
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 61° 75° 3675 2409 1348 709 404
06-27 53° 67° 3713 2437 1366 719 409
06-28 58° 71° 3756 2469 1388 734 419
06-29 67° 76° 3805 2509 1417 755 435
06-30 54° 70° 3842 2536 1434 764 439
07-01 47° 68° 3878 2561 1450 772 442
07-02 57° 67° 3918 2591 1470 784 449
07-03 66° 74° 3966 2629 1498 804 464
07-04 64° 76° 4014 2668 1527 824 479
07-05 62° 75° 4061 2704 1553 843 493
07-06 62° 69° 4104 2738 1577 858 503
07-07 57° 77° 4149 2773 1602 875 515
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 66° 77° 4199 2813 1631 897 532
07-09 64° 77° 4247 2851 1660 917 547
07-10 66° 72° 4295 2888 1687 937 562
07-11 61° 75° 4341 2924 1713 955 575
07-12 62° 79° 4389 2963 1742 975 590
07-13 61° 81° 4439 3002 1771 997 607
07-14 68° 80° 4490 3044 1803 1020 625
07-15 69° 79° 4542 3086 1835 1044 644
07-16 66° 76° 4592 3126 1864 1066 661
07-17 63° 73° 4638 3162 1890 1084 674
07-18 55° 72° 4679 3193 1912 1097 682
07-19 52° 75° 4721 3225 1933 1111 691
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 61° 76° 4768 3261 1960 1130 705
07-21 63° 77° 4815 3299 1988 1149 719
07-22 60° 78° 4862 3336 2015 1168 733
07-23 58° 77° 4908 3371 2040 1186 746
07-24 61° 71° 4952 3406 2065 1202 757
07-25 55° 73° 4994 3438 2087 1216 766
07-26 53° 76° 5037 3470 2109 1231 776
07-27 58° 78° 5083 3507 2135 1249 789
07-28 60° 82° 5132 3546 2165 1270 805
07-29 70° 78° 5184 3588 2197 1294 824
07-30 67° 79° 5235 3629 2228 1317 842
07-31 70° 80° 5288 3672 2261 1342 862
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 69° 81° 5341 3715 2294 1367 882
08-02 71° 83° 5396 3759 2328 1394 904
08-03 66° 82° 5448 3802 2360 1418 923
08-04 65° 82° 5500 3843 2392 1442 942
08-05 66° 79° 5550 3884 2423 1464 959
08-06 56° 75° 5594 3917 2446 1480 970
08-07 55° 77° 5638 3952 2470 1496 981
08-08 59° 74° 5683 3986 2495 1513 993
08-09 60° 68° 5724 4018 2517 1526 1001
08-10 60° 68° 5767 4050 2539 1541 1011
08-11 58° 72° 5809 4083 2562 1555 1020
08-12 58° 75° 5854 4118 2586 1572 1032
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 56° 76° 5898 4152 2611 1588 1043
08-14 56° 78° 5943 4187 2636 1605 1055
08-15 61° 75° 5990 4223 2662 1624 1069
08-16 65° 75° 6038 4262 2690 1644 1084
08-17 66° 73° 6086 4299 2718 1664 1099
08-18 64° 73° 6133 4336 2745 1683 1113
08-19 59° 70° 6175 4369 2768 1697 1122
08-20 51° 68° 6212 4396 2785 1706 1126
08-21 47° 69° 6248 4422 2801 1714 1129
08-22 49° 71° 6287 4450 2819 1725 1135
08-23 54° 73° 6328 4482 2841 1738 1143
08-24 57° 76° 6373 4517 2865 1755 1155
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 63° 82° 6423 4557 2896 1777 1172
08-26 72° 83° 6479 4602 2931 1805 1195
08-27 72° 81° 6533 4647 2965 1831 1216
08-28 67° 75° 6582 4685 2994 1852 1232
08-29 65° 76° 6630 4724 3023 1872 1247
08-30 69° 74° 6680 4763 3052 1894 1264
08-31 61° 76° 6726 4800 3079 1912 1277
09-01 57° 70° 6768 4831 3100 1926 1286
09-02 50° 71° 6806 4860 3119 1936 1291
09-03 50° 72° 6845 4889 3138 1947 1297
09-04 53° 75° 6887 4921 3160 1961 1306
09-05 56° 77° 6931 4955 3184 1977 1317
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 53° 67° 6970 4983 3202 1988 1323
09-07 47° 59° 7001 5005 3214 1991 1323
09-08 44° 68° 7035 5029 3228 1997 1324
09-09 57° 73° 7078 5062 3251 2012 1334
09-10 52° 73° 7119 5093 3272 2025 1342
09-11 57° 76° 7164 5128 3296 2042 1353
09-12 56° 82° 7211 5164 3323 2061 1367
09-13 59° 83° 7260 5203 3352 2082 1383
09-14 59° 82° 7308 5242 3380 2102 1399
09-15 61° 80° 7356 5280 3409 2122 1414
09-16 59° 82° 7405 5319 3437 2143 1430
09-17 57° 78° 7451 5354 3463 2161 1442
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 54° 78° 7495 5388 3487 2177 1453
09-19 54° 79° 7539 5423 3512 2193 1465
09-20 63° 77° 7587 5461 3540 2213 1480
09-21 57° 78° 7633 5496 3565 2231 1492
09-22 58° 68° 7674 5528 3587 2244 1501
09-23 50° 67° 7710 5554 3603 2252 1504
09-24 56° 61° 7747 5580 3619 2261 1507
09-25 57° 69° 7788 5611 3640 2274 1515
09-26 53° 72° 7828 5642 3660 2286 1523
09-27 55° 75° 7871 5675 3683 2301 1533
09-28 57° 76° 7916 5709 3708 2318 1544
09-29 53° 78° 7959 5743 3732 2333 1555
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 54° 74° 8002 5775 3754 2348 1564

 

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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