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Early Season Fungicide App for Dollar Spot Suppression (GDD 50)
through Sun, Dec. 14. 2025

 
  

Rockford, 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 18° 26° 0 0 0 0 0
02-16 20° 27° 2 0 0 0 0
02-17 1° 19° 2 0 0 0 0
02-18 -8° 14° 2 0 0 0 0
02-19 8° 18° 2 0 0 0 0
02-20 14° 26° 2 0 0 0 0
02-21 17° 31° 4 0 0 0 0
02-22 18° 31° 7 0 0 0 0
02-23 28° 35° 16 0 0 0 0
02-24 33° 46° 34 7 0 0 0
02-25 33° 51° 53 17 0 0 0
02-26 27° 37° 63 17 0 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 33° 40° 78 22 0 0 0
02-28 27° 50° 94 28 0 0 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 18° 30° 96 28 0 0 0
03-02 17° 31° 98 28 0 0 0
03-03 20° 41° 107 28 0 0 0
03-04 36° 50° 128 39 1 0 0
03-05 29° 51° 146 47 1 0 0
03-06 25° 33° 153 47 1 0 0
03-07 28° 38° 164 48 1 0 0
03-08 18° 37° 170 48 1 0 0
03-09 31° 54° 191 59 2 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 35° 62° 217 75 8 0 0
03-11 36° 55° 241 89 12 0 0
03-12 30° 48° 258 96 12 0 0
03-13 26° 60° 279 107 13 0 0
03-14 42° 76° 316 134 30 9 4
03-15 51° 70° 354 162 48 19 9
03-16 28° 48° 370 168 48 19 9
03-17 19° 48° 381 170 48 19 9
03-18 41° 67° 414 192 60 24 9
03-19 49° 69° 451 219 78 33 14
03-20 29° 47° 467 225 78 33 14
03-21 25° 56° 485 233 78 33 14
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 25° 49° 500 238 78 33 14
03-23 23° 46° 512 240 78 33 14
03-24 32° 38° 525 243 78 33 14
03-25 27° 38° 536 244 78 33 14
03-26 23° 46° 549 247 78 33 14
03-27 28° 50° 566 254 78 33 14
03-28 40° 69° 598 277 90 38 14
03-29 36° 66° 627 295 99 39 14
03-30 35° 62° 654 312 106 39 14
03-31 31° 43° 669 317 106 39 14
04-01 21° 41° 678 317 106 39 14
04-02 33° 56° 701 330 109 39 14
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 38° 60° 728 347 116 39 14
04-04 30° 50° 746 355 116 39 14
04-05 38° 52° 769 368 119 39 14
04-06 30° 47° 786 375 119 39 14
04-07 27° 40° 798 376 119 39 14
04-08 23° 35° 805 376 119 39 14
04-09 25° 47° 819 381 119 39 14
04-10 33° 42° 835 386 119 39 14
04-11 28° 54° 853 395 119 39 14
04-12 28° 58° 874 406 120 39 14
04-13 45° 60° 905 426 130 41 14
04-14 48° 62° 937 449 143 46 14
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 36° 47° 957 459 143 46 14
04-16 34° 52° 978 470 144 46 14
04-17 30° 64° 1004 486 150 46 14
04-18 54° 69° 1043 515 169 57 20
04-19 43° 68° 1077 539 183 63 21
04-20 35° 55° 1100 552 186 63 21
04-21 44° 59° 1129 571 195 64 21
04-22 36° 62° 1156 588 202 64 21
04-23 43° 67° 1189 611 215 69 21
04-24 48° 80° 1231 643 237 83 29
04-25 49° 77° 1272 674 258 96 37
04-26 43° 60° 1301 693 267 97 37
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 36° 68° 1331 713 277 99 37
04-28 47° 77° 1371 743 297 111 45
04-29 47° 77° 1411 773 317 123 52
04-30 35° 61° 1437 789 323 123 52
05-01 46° 68° 1472 814 338 130 54
05-02 42° 58° 1500 832 346 130 54
05-03 39° 58° 1527 849 353 130 54
05-04 40° 62° 1556 868 362 131 54
05-05 48° 68° 1592 893 378 139 57
05-06 52° 62° 1627 919 393 146 59
05-07 45° 78° 1666 948 412 157 65
05-08 43° 57° 1694 966 420 158 65
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 32° 67° 1722 984 428 158 65
05-10 45° 75° 1760 1012 446 167 70
05-11 41° 71° 1794 1036 460 173 71
05-12 45° 83° 1836 1068 482 187 80
05-13 62° 72° 1881 1103 507 205 92
05-14 62° 76° 1928 1140 534 224 106
05-15 60° 84° 1978 1180 564 246 124
05-16 55° 83° 2026 1217 592 265 138
05-17 51° 62° 2060 1242 606 272 140
05-18 49° 61° 2093 1265 619 277 140
05-19 42° 54° 2119 1281 625 277 140
05-20 41° 49° 2142 1294 628 277 140
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 47° 49° 2168 1310 634 277 140
05-22 45° 57° 2198 1329 644 278 140
05-23 38° 53° 2221 1343 647 278 140
05-24 38° 61° 2249 1361 655 278 140
05-25 39° 66° 2280 1382 666 281 140
05-26 42° 71° 2314 1406 680 287 141
05-27 52° 73° 2354 1436 700 299 148
05-28 56° 64° 2393 1464 719 310 153
05-29 52° 68° 2431 1493 737 320 159
05-30 48° 69° 2468 1519 754 329 162
05-31 44° 62° 2498 1540 764 331 162
06-01 36° 67° 2528 1560 774 333 162
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 39° 77° 2565 1586 791 342 166
06-03 57° 86° 2614 1626 820 363 182
06-04 61° 78° 2661 1663 847 382 197
06-05 55° 76° 2705 1697 871 398 208
06-06 53° 78° 2749 1731 895 414 218
06-07 51° 79° 2792 1764 918 429 228
06-08 58° 79° 2838 1800 944 447 241
06-09 55° 75° 2881 1833 967 462 251
06-10 52° 66° 2918 1860 984 471 255
06-11 49° 83° 2962 1894 1008 487 266
06-12 63° 75° 3009 1931 1035 506 281
06-13 58° 72° 3053 1964 1059 522 291
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 54° 78° 3097 1999 1083 538 302
06-15 57° 78° 3142 2034 1108 555 315
06-16 59° 84° 3192 2074 1138 577 331
06-17 65° 87° 3246 2118 1172 603 352
06-18 68° 79° 3297 2159 1203 626 371
06-19 62° 77° 3345 2197 1231 646 386
06-20 60° 80° 3394 2235 1260 667 401
06-21 73° 94° 3455 2287 1301 700 429
06-22 80° 94° 3520 2341 1346 737 461
06-23 78° 95° 3584 2396 1390 773 492
06-24 72° 92° 3644 2446 1430 805 519
06-25 70° 79° 3696 2488 1462 829 539
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 66° 90° 3752 2534 1498 857 561
06-27 70° 87° 3808 2580 1534 885 585
06-28 65° 80° 3859 2621 1565 908 602
06-29 61° 89° 3912 2664 1598 933 622
06-30 72° 84° 3968 2709 1634 961 645
07-01 66° 81° 4019 2751 1665 984 663
07-02 64° 85° 4072 2794 1698 1009 683
07-03 62° 85° 4124 2835 1730 1033 702
07-04 65° 87° 4178 2879 1764 1059 723
07-05 71° 90° 4236 2928 1802 1089 749
07-06 71° 83° 4292 2973 1838 1117 771
07-07 64° 79° 4341 3013 1867 1138 787
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 59° 83° 4390 3052 1896 1159 803
07-09 67° 83° 4443 3095 1929 1184 824
07-10 62° 82° 4493 3135 1959 1206 841
07-11 65° 82° 4545 3176 1991 1230 859
07-12 71° 82° 4599 3221 2025 1256 880
07-13 65° 83° 4651 3263 2057 1280 899
07-14 57° 86° 4701 3302 2087 1302 916
07-15 59° 89° 4752 3344 2118 1325 935
07-16 69° 85° 4808 3390 2154 1353 957
07-17 60° 73° 4852 3424 2178 1369 968
07-18 54° 78° 4896 3458 2202 1385 979
07-19 63° 80° 4945 3497 2231 1406 996
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 67° 79° 4996 3538 2262 1429 1013
07-21 56° 79° 5042 3573 2288 1447 1026
07-22 59° 82° 5090 3612 2316 1467 1041
07-23 62° 89° 5144 3656 2350 1493 1062
07-24 73° 91° 5204 3706 2390 1525 1089
07-25 70° 84° 5259 3751 2425 1552 1112
07-26 71° 83° 5315 3796 2461 1580 1134
07-27 71° 92° 5374 3846 2500 1611 1160
07-28 69° 90° 5431 3893 2537 1640 1185
07-29 66° 91° 5488 3940 2574 1669 1208
07-30 63° 82° 5538 3980 2604 1691 1226
07-31 59° 76° 5584 4016 2630 1709 1238
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 56° 77° 5628 4050 2654 1725 1250
08-02 51° 78° 5671 4083 2677 1740 1259
08-03 54° 80° 5716 4118 2702 1757 1272
08-04 56° 81° 5763 4155 2729 1776 1285
08-05 61° 83° 5813 4195 2759 1798 1302
08-06 62° 86° 5865 4237 2791 1822 1321
08-07 65° 88° 5920 4282 2826 1849 1343
08-08 70° 89° 5977 4329 2863 1878 1368
08-09 69° 92° 6036 4377 2902 1909 1393
08-10 69° 91° 6094 4425 2940 1939 1418
08-11 70° 86° 6149 4471 2975 1966 1441
08-12 67° 84° 6203 4515 3009 1992 1461
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 68° 84° 6257 4559 3043 2018 1482
08-14 63° 82° 6308 4599 3074 2041 1500
08-15 65° 87° 6361 4643 3107 2066 1521
08-16 69° 89° 6418 4690 3144 2095 1545
08-17 65° 83° 6471 4732 3177 2120 1564
08-18 59° 82° 6519 4771 3205 2140 1579
08-19 65° 75° 6567 4809 3233 2160 1594
08-20 62° 77° 6615 4846 3261 2180 1609
08-21 60° 77° 6661 4883 3287 2198 1623
08-22 56° 80° 6707 4919 3313 2216 1635
08-23 62° 79° 6756 4958 3342 2237 1651
08-24 54° 70° 6796 4988 3362 2249 1658
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 53° 68° 6835 5016 3381 2260 1664
08-26 45° 69° 6870 5042 3396 2267 1666
08-27 42° 74° 6906 5068 3412 2275 1670
08-28 56° 76° 6950 5102 3436 2291 1680
08-29 44° 67° 6984 5126 3450 2297 1681
08-30 42° 73° 7019 5151 3465 2304 1684
08-31 46° 77° 7059 5180 3485 2316 1690
09-01 50° 77° 7100 5212 3506 2329 1699
09-02 50° 79° 7143 5244 3529 2344 1708
09-03 54° 68° 7182 5274 3548 2355 1714
09-04 45° 62° 7214 5295 3560 2359 1714
09-05 51° 62° 7248 5320 3574 2365 1716
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 48° 60° 7280 5342 3586 2369 1716
09-07 41° 64° 7311 5362 3597 2372 1716
09-08 38° 67° 7341 5383 3607 2374 1716
09-09 43° 73° 7377 5409 3623 2382 1719
09-10 49° 78° 7419 5441 3645 2396 1727
09-11 52° 79° 7462 5474 3668 2411 1738
09-12 51° 81° 7506 5508 3692 2427 1749
09-13 55° 76° 7549 5541 3715 2442 1759
09-14 55° 83° 7596 5578 3742 2461 1773
09-15 55° 82° 7643 5615 3769 2480 1786
09-16 55° 80° 7689 5650 3795 2498 1799
09-17 51° 83° 7734 5686 3820 2515 1811
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 57° 85° 7783 5725 3849 2536 1827
09-19 62° 81° 7832 5764 3878 2557 1844
09-20 56° 80° 7879 5800 3905 2576 1857
09-21 59° 74° 7923 5835 3929 2592 1869
09-22 62° 77° 7971 5873 3957 2612 1883
09-23 62° 74° 8017 5908 3983 2630 1896
09-24 59° 72° 8060 5942 4006 2645 1907
09-25 58° 73° 8103 5975 4029 2660 1917
09-26 52° 77° 8146 6008 4052 2675 1927
09-27 54° 82° 8192 6044 4078 2693 1939
09-28 56° 77° 8236 6078 4102 2709 1951
09-29 49° 82° 8279 6111 4125 2724 1961
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 51° 79° 8323 6145 4149 2740 1971
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 27° 35° 9 0 0 0 0
02-16 21° 27° 11 0 0 0 0
02-17 16° 26° 11 0 0 0 0
02-18 22° 32° 16 0 0 0 0
02-19 14° 39° 21 0 0 0 0
02-20 22° 50° 35 4 0 0 0
02-21 37° 62° 63 22 8 0 0
02-22 31° 55° 84 33 9 0 0
02-23 25° 42° 95 35 9 0 0
02-24 13° 30° 95 35 9 0 0
02-25 25° 48° 110 39 9 0 0
02-26 31° 59° 133 52 12 0 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 51° 74° 173 82 32 13 8
02-28 20° 58° 190 90 32 13 8
02-29 15° 35° 194 90 32 13 8
03-01 26° 49° 209 95 32 13 8
03-02 39° 54° 233 109 37 13 8
03-03 38° 65° 263 129 46 14 8
03-04 48° 69° 299 156 63 23 11
03-05 42° 63° 330 176 73 25 11
03-06 35° 52° 352 188 75 25 11
03-07 31° 48° 369 195 75 25 11
03-08 38° 46° 389 205 75 25 11
03-09 32° 45° 406 212 75 25 11
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 29° 38° 417 213 75 25 11
03-11 26° 60° 438 224 76 25 11
03-12 43° 68° 472 248 90 31 12
03-13 42° 69° 505 271 103 36 12
03-14 43° 57° 533 289 111 36 12
03-15 34° 50° 552 298 111 36 12
03-16 32° 53° 573 309 111 36 12
03-17 28° 38° 584 310 111 36 12
03-18 26° 33° 591 310 111 36 12
03-19 30° 43° 606 314 111 36 12
03-20 22° 34° 612 314 111 36 12
03-21 15° 35° 615 314 111 36 12
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 25° 31° 621 314 111 36 12
03-23 24° 35° 629 314 111 36 12
03-24 23° 38° 637 314 111 36 12
03-25 32° 64° 663 330 117 36 12
03-26 41° 59° 691 349 125 36 12
03-27 31° 38° 703 351 125 36 12
03-28 28° 42° 717 354 125 36 12
03-29 23° 51° 732 359 125 36 12
03-30 35° 43° 749 366 125 36 12
03-31 36° 45° 767 374 125 36 12
04-01 34° 51° 787 384 125 36 12
04-02 36° 44° 805 392 125 36 12
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 35° 42° 822 399 125 36 12
04-04 35° 44° 839 407 125 36 12
04-05 34° 50° 859 417 125 36 12
04-06 31° 58° 882 429 128 36 12
04-07 32° 59° 905 443 131 36 12
04-08 43° 70° 940 467 146 43 14
04-09 47° 65° 974 492 160 49 15
04-10 38° 66° 1004 512 170 51 15
04-11 47° 54° 1033 530 179 52 15
04-12 45° 54° 1060 548 186 52 15
04-13 40° 58° 1087 565 193 52 15
04-14 49° 76° 1128 595 214 64 22
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 45° 67° 1162 619 228 70 24
04-16 45° 66° 1195 643 241 76 24
04-17 53° 66° 1233 670 259 85 29
04-18 47° 54° 1262 689 267 86 29
04-19 42° 50° 1286 703 272 86 29
04-20 35° 44° 1304 711 272 86 29
04-21 33° 48° 1322 719 272 86 29
04-22 34° 63° 1348 736 278 86 29
04-23 49° 62° 1382 759 292 91 29
04-24 36° 53° 1404 772 294 91 29
04-25 29° 56° 1425 782 295 91 29
04-26 35° 64° 1452 800 302 91 29
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 52° 79° 1496 833 326 107 40
04-28 54° 71° 1536 864 346 120 47
04-29 51° 70° 1575 892 365 130 53
04-30 46° 62° 1607 914 377 134 53
05-01 50° 72° 1646 943 396 145 59
05-02 48° 76° 1686 973 416 157 66
05-03 57° 69° 1727 1004 437 170 74
05-04 50° 76° 1768 1036 458 184 82
05-05 53° 70° 1808 1065 477 195 88
05-06 49° 69° 1844 1092 494 204 92
05-07 49° 67° 1881 1118 511 212 96
05-08 50° 74° 1921 1148 531 224 103
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 51° 59° 1954 1171 544 229 103
05-10 43° 65° 1986 1193 556 233 103
05-11 49° 59° 2018 1215 568 237 103
05-12 39° 75° 2053 1240 583 244 105
05-13 61° 79° 2101 1279 611 264 120
05-14 53° 62° 2137 1304 627 272 123
05-15 50° 73° 2176 1334 646 284 129
05-16 47° 74° 2215 1362 664 294 135
05-17 58° 78° 2260 1398 690 312 147
05-18 48° 83° 2304 1431 714 327 158
05-19 61° 85° 2355 1472 745 350 176
05-20 52° 81° 2400 1507 770 367 188
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 58° 84° 2449 1546 799 388 204
05-22 61° 78° 2497 1584 826 408 219
05-23 53° 76° 2539 1616 849 422 228
05-24 50° 80° 2582 1650 872 437 238
05-25 56° 72° 2624 1682 894 452 247
05-26 51° 75° 2666 1713 916 465 256
05-27 56° 63° 2703 1741 933 475 260
05-28 53° 68° 2742 1769 951 485 266
05-29 54° 70° 2781 1799 971 497 272
05-30 45° 71° 2817 1825 987 505 275
05-31 46° 78° 2857 1855 1007 517 282
06-01 54° 74° 2899 1887 1029 531 291
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 60° 76° 2945 1923 1055 549 304
06-03 53° 82° 2991 1958 1081 566 317
06-04 66° 84° 3044 2001 1113 591 337
06-05 62° 77° 3091 2038 1141 610 351
06-06 58° 72° 3134 2072 1164 626 361
06-07 56° 69° 3175 2102 1185 638 369
06-08 51° 69° 3213 2130 1203 648 374
06-09 53° 73° 3254 2161 1224 661 382
06-10 50° 70° 3292 2190 1242 671 387
06-11 44° 73° 3328 2216 1258 680 390
06-12 58° 83° 3377 2254 1287 700 406
06-13 70° 84° 3432 2299 1321 727 428
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 59° 80° 3479 2336 1349 746 442
06-15 55° 80° 3524 2372 1374 764 454
06-16 63° 88° 3578 2416 1408 789 475
06-17 69° 92° 3637 2464 1446 820 501
06-18 77° 88° 3697 2515 1487 852 528
06-19 77° 91° 3759 2566 1529 886 557
06-20 71° 86° 3816 2613 1565 915 581
06-21 67° 89° 3871 2659 1601 943 603
06-22 71° 85° 3928 2705 1638 971 627
06-23 65° 75° 3976 2743 1666 991 642
06-24 57° 79° 4022 2780 1692 1009 655
06-25 66° 80° 4073 2821 1723 1033 673
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 66° 81° 4125 2863 1755 1056 692
06-27 54° 72° 4166 2894 1776 1069 700
06-28 59° 72° 4210 2927 1800 1085 711
06-29 67° 80° 4262 2969 1832 1109 730
06-30 56° 74° 4304 3002 1854 1124 739
07-01 46° 75° 4343 3031 1873 1134 745
07-02 55° 71° 4384 3062 1894 1147 753
07-03 68° 81° 4437 3104 1927 1172 773
07-04 66° 82° 4489 3146 1959 1196 792
07-05 62° 81° 4538 3186 1988 1217 808
07-06 64° 76° 4586 3223 2016 1237 823
07-07 57° 83° 4634 3261 2043 1257 838
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 67° 84° 4687 3305 2077 1282 858
07-09 67° 83° 4740 3348 2110 1308 878
07-10 66° 76° 4789 3387 2139 1329 894
07-11 61° 81° 4838 3426 2168 1350 910
07-12 64° 83° 4890 3467 2200 1373 929
07-13 62° 86° 4942 3510 2232 1397 948
07-14 68° 84° 4996 3554 2266 1424 969
07-15 67° 83° 5050 3597 2300 1449 990
07-16 67° 79° 5101 3638 2331 1472 1008
07-17 63° 78° 5149 3677 2359 1492 1023
07-18 54° 74° 5191 3709 2381 1506 1032
07-19 51° 79° 5234 3742 2404 1522 1042
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 55° 80° 5280 3777 2430 1539 1055
07-21 59° 82° 5328 3816 2458 1560 1070
07-22 61° 82° 5378 3856 2488 1581 1087
07-23 56° 82° 5425 3893 2515 1601 1101
07-24 64° 76° 5473 3931 2543 1621 1116
07-25 55° 78° 5518 3966 2568 1637 1128
07-26 54° 80° 5563 4001 2593 1655 1140
07-27 56° 83° 5611 4038 2621 1674 1155
07-28 58° 86° 5661 4078 2651 1696 1172
07-29 71° 85° 5717 4124 2687 1724 1195
07-30 70° 84° 5772 4169 2722 1751 1217
07-31 66° 86° 5826 4214 2756 1777 1238
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 67° 84° 5880 4257 2790 1803 1259
08-02 70° 86° 5936 4303 2826 1831 1282
08-03 66° 88° 5991 4348 2861 1858 1304
08-04 63° 86° 6044 4391 2893 1883 1324
08-05 68° 79° 6095 4433 2925 1907 1342
08-06 60° 73° 6140 4467 2949 1923 1354
08-07 56° 78° 6185 4502 2975 1940 1366
08-08 55° 80° 6230 4538 3000 1958 1378
08-09 60° 73° 6275 4572 3025 1974 1390
08-10 55° 68° 6314 4602 3044 1985 1396
08-11 58° 75° 6359 4636 3068 2002 1408
08-12 54° 80° 6404 4671 3094 2019 1420
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 56° 82° 6451 4708 3121 2038 1434
08-14 56° 83° 6499 4746 3149 2058 1449
08-15 60° 79° 6546 4783 3176 2077 1463
08-16 64° 82° 6597 4824 3207 2100 1481
08-17 65° 76° 6646 4863 3236 2121 1497
08-18 66° 76° 6695 4902 3265 2142 1513
08-19 56° 73° 6737 4935 3287 2157 1522
08-20 49° 70° 6775 4962 3305 2166 1527
08-21 46° 74° 6813 4990 3323 2176 1532
08-22 48° 76° 6853 5020 3343 2188 1539
08-23 51° 78° 6895 5053 3365 2203 1548
08-24 56° 84° 6943 5091 3393 2222 1563
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 65° 88° 6998 5135 3427 2249 1585
08-26 71° 91° 7056 5184 3466 2280 1610
08-27 72° 90° 7115 5233 3505 2310 1636
08-28 70° 83° 7170 5277 3540 2337 1658
08-29 65° 79° 7220 5317 3570 2359 1675
08-30 67° 82° 7273 5360 3603 2384 1695
08-31 58° 81° 7321 5398 3631 2404 1710
09-01 58° 75° 7365 5432 3655 2420 1721
09-02 46° 73° 7402 5460 3672 2430 1725
09-03 47° 76° 7442 5489 3692 2441 1732
09-04 49° 79° 7484 5521 3714 2455 1741
09-05 54° 84° 7530 5558 3740 2474 1754
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 54° 67° 7569 5586 3759 2484 1760
09-07 45° 61° 7600 5607 3770 2487 1760
09-08 41° 69° 7633 5630 3783 2492 1760
09-09 56° 78° 7678 5666 3808 2509 1772
09-10 48° 81° 7720 5698 3830 2524 1781
09-11 51° 85° 7766 5734 3856 2542 1794
09-12 52° 85° 7813 5770 3883 2560 1808
09-13 57° 84° 7861 5809 3911 2581 1823
09-14 55° 85° 7910 5847 3940 2601 1839
09-15 57° 87° 7960 5888 3970 2624 1856
09-16 55° 86° 8009 5926 3999 2644 1872
09-17 53° 83° 8055 5962 4025 2662 1885
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 52° 83° 8100 5998 4050 2680 1897
09-19 55° 84° 8148 6035 4078 2699 1912
09-20 62° 83° 8198 6076 4108 2722 1929
09-21 57° 85° 8247 6114 4137 2742 1945
09-22 62° 71° 8292 6149 4161 2759 1957
09-23 52° 66° 8329 6176 4178 2768 1961
09-24 56° 67° 8368 6205 4198 2779 1967
09-25 57° 73° 8411 6238 4221 2794 1977
09-26 49° 74° 8450 6268 4240 2806 1983
09-27 54° 74° 8492 6300 4262 2819 1992
09-28 61° 77° 8539 6336 4289 2838 2006
09-29 61° 80° 8587 6375 4317 2858 2021
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 56° 77° 8632 6409 4342 2875 2033

 

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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