Welcome!

It appears to be your first time visiting GDDTracker
Please enter your zip code for a customized experience. Also, be sure and watch our video introduction video.

   
       

Early Season Fungicide App for Dollar Spot Suppression (GDD 50)
forecast for Tue, Dec. 16. 2025

 
  

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 21° 26° 2 0 0 0 0
02-16 9° 21° 2 0 0 0 0
02-17 8° 11° 2 0 0 0 0
02-18 8° 15° 2 0 0 0 0
02-19 15° 21° 2 0 0 0 0
02-20 20° 23° 2 0 0 0 0
02-21 10° 30° 2 0 0 0 0
02-22 22° 31° 7 0 0 0 0
02-23 24° 32° 13 0 0 0 0
02-24 32° 39° 27 4 0 0 0
02-25 28° 35° 36 4 0 0 0
02-26 30° 38° 48 5 0 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 26° 36° 57 5 0 0 0
02-28 16° 34° 60 5 0 0 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 11° 22° 60 5 0 0 0
03-02 18° 31° 63 5 0 0 0
03-03 27° 39° 74 6 0 0 0
03-04 33° 35° 86 8 0 0 0
03-05 21° 34° 91 8 0 0 0
03-06 21° 32° 96 8 0 0 0
03-07 19° 28° 98 8 0 0 0
03-08 16° 35° 101 8 0 0 0
03-09 28° 44° 115 12 0 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 32° 47° 133 20 0 0 0
03-11 20° 40° 140 20 0 0 0
03-12 26° 35° 149 20 0 0 0
03-13 30° 39° 162 22 0 0 0
03-14 36° 42° 178 29 0 0 0
03-15 35° 44° 196 37 0 0 0
03-16 23° 34° 203 37 0 0 0
03-17 27° 36° 212 37 0 0 0
03-18 32° 34° 223 38 0 0 0
03-19 33° 35° 235 40 0 0 0
03-20 29° 35° 245 40 0 0 0
03-21 24° 38° 254 40 0 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 14° 22° 254 40 0 0 0
03-23 19° 32° 258 40 0 0 0
03-24 30° 32° 267 40 0 0 0
03-25 26° 30° 272 40 0 0 0
03-26 20° 38° 280 40 0 0 0
03-27 32° 36° 292 42 0 0 0
03-28 31° 33° 302 42 0 0 0
03-29 30° 33° 311 42 0 0 0
03-30 29° 34° 321 42 0 0 0
03-31 26° 32° 328 42 0 0 0
04-01 22° 35° 335 42 0 0 0
04-02 31° 34° 345 42 0 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 32° 36° 357 44 0 0 0
04-04 31° 38° 370 47 0 0 0
04-05 32° 35° 382 49 0 0 0
04-06 30° 35° 393 50 0 0 0
04-07 23° 32° 398 50 0 0 0
04-08 26° 30° 404 50 0 0 0
04-09 27° 36° 413 50 0 0 0
04-10 33° 38° 427 53 0 0 0
04-11 32° 42° 442 58 0 0 0
04-12 34° 43° 458 65 0 0 0
04-13 41° 44° 479 75 1 0 0
04-14 34° 40° 494 80 1 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 32° 35° 505 82 1 0 0
04-16 32° 37° 518 84 1 0 0
04-17 33° 44° 534 91 1 0 0
04-18 36° 40° 550 97 1 0 0
04-19 34° 37° 563 100 1 0 0
04-20 32° 41° 578 104 1 0 0
04-21 34° 37° 591 107 1 0 0
04-22 35° 38° 606 112 1 0 0
04-23 35° 45° 623 120 1 0 0
04-24 37° 40° 640 126 1 0 0
04-25 36° 38° 655 132 1 0 0
04-26 35° 42° 672 138 1 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 33° 44° 688 145 1 0 0
04-28 42° 49° 712 159 4 0 0
04-29 31° 46° 729 165 4 0 0
04-30 29° 40° 741 167 4 0 0
05-01 38° 42° 759 175 4 0 0
05-02 35° 38° 774 180 4 0 0
05-03 35° 42° 790 187 4 0 0
05-04 37° 43° 809 195 4 0 0
05-05 35° 48° 828 205 4 0 0
05-06 39° 50° 851 217 7 0 0
05-07 37° 41° 868 224 7 0 0
05-08 34° 39° 883 229 7 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 32° 52° 902 239 7 0 0
05-10 38° 42° 921 247 7 0 0
05-11 38° 58° 946 263 13 0 0
05-12 46° 61° 978 285 24 4 0
05-13 48° 56° 1008 305 34 6 0
05-14 46° 52° 1035 322 42 6 0
05-15 45° 50° 1061 337 47 6 0
05-16 44° 56° 1089 355 55 6 0
05-17 38° 44° 1108 364 55 6 0
05-18 35° 39° 1123 369 55 6 0
05-19 36° 40° 1139 376 55 6 0
05-20 38° 42° 1157 384 55 6 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 40° 47° 1179 395 57 6 0
05-22 39° 42° 1197 404 57 6 0
05-23 39° 43° 1216 413 57 6 0
05-24 40° 45° 1237 423 57 6 0
05-25 40° 45° 1257 433 58 6 0
05-26 38° 46° 1277 444 58 6 0
05-27 40° 48° 1299 455 59 6 0
05-28 42° 50° 1323 469 63 6 0
05-29 43° 55° 1350 486 70 6 0
05-30 41° 52° 1374 501 75 6 0
05-31 38° 47° 1394 511 75 6 0
06-01 38° 46° 1414 521 75 6 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 42° 62° 1444 541 85 8 0
06-03 44° 59° 1474 560 94 9 0
06-04 46° 61° 1505 582 106 13 0
06-05 43° 52° 1531 598 112 13 0
06-06 44° 50° 1556 613 117 13 0
06-07 42° 49° 1580 626 120 13 0
06-08 45° 50° 1605 642 126 13 0
06-09 42° 48° 1628 655 129 13 0
06-10 42° 52° 1654 670 134 13 0
06-11 46° 55° 1682 688 143 13 0
06-12 41° 48° 1704 701 145 13 0
06-13 38° 44° 1723 710 145 13 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 38° 44° 1742 719 145 13 0
06-15 40° 48° 1764 731 147 13 0
06-16 45° 54° 1792 748 154 13 0
06-17 46° 61° 1823 769 165 17 0
06-18 44° 55° 1851 787 173 17 0
06-19 43° 50° 1875 801 177 17 0
06-20 41° 50° 1899 815 181 17 0
06-21 46° 60° 1930 836 192 20 0
06-22 45° 61° 1960 857 203 22 0
06-23 49° 65° 1996 882 218 30 2
06-24 46° 56° 2024 901 227 30 2
06-25 43° 49° 2049 915 231 30 2
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 46° 51° 2075 932 238 30 2
06-27 46° 51° 2102 948 244 30 2
06-28 49° 54° 2131 968 254 32 2
06-29 46° 61° 2163 989 265 35 2
06-30 53° 62° 2198 1015 281 43 5
07-01 50° 63° 2233 1039 295 49 6
07-02 48° 58° 2264 1060 306 53 6
07-03 45° 53° 2291 1077 313 53 6
07-04 45° 66° 2324 1100 326 58 7
07-05 52° 65° 2361 1127 343 67 10
07-06 48° 55° 2390 1146 352 68 10
07-07 45° 55° 2418 1164 360 68 10
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 45° 54° 2445 1181 367 68 10
07-09 48° 56° 2475 1201 377 70 10
07-10 48° 55° 2504 1221 387 71 10
07-11 49° 59° 2536 1243 399 75 10
07-12 52° 60° 2570 1267 413 81 12
07-13 54° 68° 2610 1296 432 92 18
07-14 55° 64° 2647 1324 450 102 22
07-15 53° 66° 2685 1351 467 112 27
07-16 47° 54° 2713 1370 476 112 27
07-17 48° 57° 2744 1390 486 115 27
07-18 50° 58° 2776 1412 498 119 27
07-19 52° 59° 2809 1436 512 124 27
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 52° 60° 2843 1460 526 130 28
07-21 51° 62° 2878 1484 540 137 30
07-22 53° 65° 2915 1511 557 145 33
07-23 61° 65° 2955 1542 578 158 41
07-24 57° 61° 2993 1569 595 168 45
07-25 55° 60° 3028 1595 611 175 48
07-26 56° 65° 3067 1623 629 185 53
07-27 59° 64° 3106 1653 648 197 60
07-28 61° 68° 3149 1685 671 211 69
07-29 58° 62° 3186 1713 689 221 74
07-30 54° 60° 3222 1738 704 228 76
07-31 52° 60° 3256 1762 718 235 77
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 54° 64° 3293 1789 735 244 82
08-02 59° 68° 3334 1821 757 257 90
08-03 57° 65° 3373 1850 775 268 96
08-04 55° 60° 3409 1875 791 276 99
08-05 57° 62° 3446 1903 808 285 103
08-06 58° 63° 3484 1931 827 295 108
08-07 62° 67° 3527 1964 850 310 118
08-08 64° 70° 3572 1999 874 327 130
08-09 64° 71° 3617 2034 900 344 142
08-10 64° 69° 3662 2068 924 360 153
08-11 64° 69° 3706 2102 948 377 165
08-12 63° 69° 3750 2137 972 393 176
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 61° 66° 3791 2168 994 406 184
08-14 58° 65° 3831 2197 1013 418 191
08-15 65° 73° 3878 2235 1041 437 205
08-16 63° 68° 3922 2268 1064 453 215
08-17 57° 62° 3959 2296 1082 462 220
08-18 57° 66° 3999 2325 1101 474 227
08-19 62° 66° 4041 2357 1123 488 235
08-20 60° 65° 4081 2388 1144 500 243
08-21 59° 66° 4122 2418 1164 513 250
08-22 63° 67° 4165 2451 1187 528 261
08-23 62° 65° 4206 2483 1209 541 269
08-24 58° 62° 4244 2511 1227 551 274
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 57° 63° 4282 2539 1245 561 279
08-26 55° 63° 4319 2566 1262 570 283
08-27 56° 65° 4358 2595 1280 581 289
08-28 52° 61° 4393 2619 1295 588 291
08-29 49° 61° 4426 2642 1308 592 291
08-30 53° 65° 4462 2669 1325 601 294
08-31 59° 66° 4503 2699 1345 614 302
09-01 60° 66° 4544 2731 1367 627 310
09-02 60° 68° 4587 2763 1389 642 320
09-03 45° 63° 4619 2785 1401 646 320
09-04 46° 55° 4648 2804 1410 646 320
09-05 48° 53° 4676 2822 1418 647 320
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 50° 58° 4708 2844 1430 651 320
09-07 51° 57° 4740 2866 1442 655 320
09-08 51° 60° 4774 2890 1456 661 321
09-09 58° 61° 4811 2917 1473 670 325
09-10 56° 58° 4846 2943 1488 677 327
09-11 54° 59° 4880 2967 1503 683 328
09-12 54° 61° 4916 2992 1518 691 331
09-13 59° 62° 4954 3021 1536 701 336
09-14 56° 62° 4991 3048 1554 710 340
09-15 58° 65° 5031 3077 1573 722 347
09-16 60° 69° 5073 3110 1596 736 356
09-17 61° 66° 5115 3141 1617 750 365
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 57° 61° 5152 3168 1634 759 369
09-19 56° 59° 5187 3194 1650 766 371
09-20 56° 61° 5224 3220 1666 775 375
09-21 58° 65° 5263 3250 1686 786 381
09-22 58° 61° 5301 3277 1703 795 386
09-23 56° 60° 5337 3304 1719 804 389
09-24 54° 58° 5371 3328 1734 810 390
09-25 52° 67° 5409 3355 1751 820 395
09-26 53° 59° 5443 3379 1765 826 396
09-27 53° 62° 5478 3405 1781 833 398
09-28 55° 68° 5518 3434 1800 845 405
09-29 56° 65° 5556 3463 1819 855 410
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 55° 60° 5592 3488 1834 863 413
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 25° 34° 8 0 0 0 0
02-16 17° 24° 8 0 0 0 0
02-17 14° 31° 8 0 0 0 0
02-18 23° 32° 13 0 0 0 0
02-19 20° 26° 14 0 0 0 0
02-20 26° 39° 24 0 0 0 0
02-21 34° 38° 38 4 0 0 0
02-22 33° 41° 53 9 0 0 0
02-23 14° 32° 54 9 0 0 0
02-24 16° 36° 58 9 0 0 0
02-25 33° 38° 72 13 0 0 0
02-26 27° 40° 83 14 0 0 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 19° 38° 90 14 0 0 0
02-28 11° 17° 90 14 0 0 0
02-29 11° 26° 90 14 0 0 0
03-01 27° 43° 103 17 0 0 0
03-02 36° 41° 120 24 0 0 0
03-03 36° 41° 136 31 0 0 0
03-04 36° 41° 153 37 0 0 0
03-05 30° 36° 163 38 0 0 0
03-06 31° 37° 176 40 0 0 0
03-07 33° 39° 190 44 0 0 0
03-08 32° 37° 202 46 0 0 0
03-09 29° 33° 211 46 0 0 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 29° 35° 221 46 0 0 0
03-11 29° 41° 234 50 0 0 0
03-12 33° 43° 251 56 0 0 0
03-13 35° 41° 267 62 0 0 0
03-14 34° 37° 281 66 0 0 0
03-15 31° 39° 294 69 0 0 0
03-16 31° 40° 308 73 0 0 0
03-17 22° 31° 312 73 0 0 0
03-18 22° 28° 315 73 0 0 0
03-19 27° 34° 324 73 0 0 0
03-20 17° 26° 324 73 0 0 0
03-21 18° 24° 324 73 0 0 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 20° 29° 327 73 0 0 0
03-23 18° 26° 327 73 0 0 0
03-24 19° 32° 330 73 0 0 0
03-25 31° 36° 342 75 0 0 0
03-26 30° 43° 357 80 0 0 0
03-27 25° 29° 362 80 0 0 0
03-28 26° 32° 369 80 0 0 0
03-29 28° 35° 378 80 0 0 0
03-30 31° 35° 389 81 0 0 0
03-31 32° 37° 402 84 0 0 0
04-01 31° 35° 413 85 0 0 0
04-02 31° 39° 426 88 0 0 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 32° 38° 439 91 0 0 0
04-04 35° 40° 455 97 0 0 0
04-05 34° 40° 470 102 0 0 0
04-06 33° 40° 485 106 0 0 0
04-07 33° 42° 500 112 0 0 0
04-08 39° 44° 520 121 0 0 0
04-09 38° 44° 539 130 0 0 0
04-10 35° 44° 556 138 0 0 0
04-11 39° 43° 575 147 0 0 0
04-12 38° 42° 593 155 0 0 0
04-13 36° 41° 610 161 0 0 0
04-14 35° 41° 626 167 0 0 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 38° 40° 643 175 0 0 0
04-16 35° 39° 658 179 0 0 0
04-17 37° 39° 674 186 0 0 0
04-18 37° 44° 692 194 0 0 0
04-19 36° 39° 708 200 0 0 0
04-20 34° 39° 723 204 0 0 0
04-21 36° 39° 738 210 0 0 0
04-22 35° 54° 761 222 2 0 0
04-23 34° 48° 779 231 2 0 0
04-24 28° 35° 789 231 2 0 0
04-25 26° 41° 800 232 2 0 0
04-26 36° 45° 819 241 2 0 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 39° 49° 840 253 4 0 0
04-28 35° 39° 855 258 4 0 0
04-29 36° 39° 871 263 4 0 0
04-30 38° 42° 889 271 4 0 0
05-01 37° 41° 906 278 4 0 0
05-02 37° 40° 923 285 4 0 0
05-03 39° 49° 945 297 6 0 0
05-04 40° 50° 968 310 9 0 0
05-05 40° 50° 991 323 12 0 0
05-06 38° 46° 1011 333 12 0 0
05-07 40° 46° 1032 344 13 0 0
05-08 39° 47° 1053 355 14 0 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 38° 43° 1071 363 14 0 0
05-10 36° 42° 1088 370 14 0 0
05-11 39° 47° 1110 382 15 0 0
05-12 42° 52° 1135 397 21 0 0
05-13 40° 44° 1155 407 21 0 0
05-14 38° 42° 1173 415 21 0 0
05-15 36° 43° 1191 423 21 0 0
05-16 39° 44° 1210 432 21 0 0
05-17 43° 47° 1233 445 24 0 0
05-18 43° 57° 1261 463 32 0 0
05-19 46° 61° 1293 485 44 4 0
05-20 44° 52° 1319 501 50 4 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 42° 45° 1340 513 52 4 0
05-22 41° 53° 1366 528 57 4 0
05-23 41° 51° 1389 541 60 4 0
05-24 39° 45° 1409 552 61 4 0
05-25 43° 53° 1435 568 67 4 0
05-26 44° 53° 1462 584 73 4 0
05-27 43° 50° 1486 598 77 4 0
05-28 44° 48° 1510 612 81 4 0
05-29 39° 50° 1532 624 83 4 0
05-30 39° 48° 1553 636 85 4 0
05-31 47° 58° 1584 656 95 6 0
06-01 47° 55° 1613 675 104 7 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 43° 51° 1638 690 109 7 0
06-03 44° 56° 1666 708 117 7 0
06-04 49° 54° 1695 728 127 8 0
06-05 49° 55° 1725 747 136 10 0
06-06 48° 51° 1753 765 144 10 0
06-07 46° 52° 1780 782 151 10 0
06-08 46° 53° 1807 799 158 10 0
06-09 43° 48° 1831 813 162 10 0
06-10 43° 51° 1856 828 167 10 0
06-11 41° 52° 1880 842 171 10 0
06-12 50° 62° 1914 866 185 16 1
06-13 46° 58° 1944 886 195 18 1
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 43° 51° 1969 901 200 18 1
06-15 46° 57° 1999 921 210 20 1
06-16 49° 59° 2031 944 223 24 1
06-17 49° 58° 2063 965 234 28 1
06-18 48° 62° 2096 988 247 32 1
06-19 53° 60° 2130 1012 261 39 3
06-20 44° 53° 2157 1029 268 39 3
06-21 48° 53° 2185 1047 276 39 3
06-22 47° 51° 2212 1064 283 39 3
06-23 48° 57° 2242 1084 293 41 3
06-24 47° 62° 2275 1107 306 46 3
06-25 53° 65° 2312 1134 323 55 7
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 46° 52° 2339 1151 330 55 7
06-27 46° 53° 2367 1169 338 55 7
06-28 49° 54° 2397 1189 348 57 7
06-29 46° 56° 2426 1208 357 58 7
06-30 45° 57° 2455 1227 366 59 7
07-01 47° 56° 2484 1247 376 61 7
07-02 51° 55° 2516 1268 387 64 7
07-03 54° 67° 2554 1296 405 75 12
07-04 52° 60° 2588 1320 419 81 13
07-05 51° 57° 2620 1342 431 85 13
07-06 53° 57° 2653 1365 444 90 13
07-07 54° 63° 2690 1392 461 98 16
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 53° 60° 2724 1416 475 105 18
07-09 54° 60° 2759 1441 490 112 20
07-10 55° 58° 2794 1466 505 118 21
07-11 52° 60° 2828 1490 519 124 22
07-12 53° 63° 2864 1516 535 132 25
07-13 61° 73° 2909 1551 560 149 37
07-14 61° 67° 2951 1583 582 163 46
07-15 57° 65° 2990 1612 601 174 52
07-16 57° 61° 3027 1639 618 184 57
07-17 56° 60° 3063 1665 634 192 60
07-18 54° 64° 3100 1692 651 201 64
07-19 58° 69° 3142 1724 673 214 72
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 58° 64° 3181 1753 692 226 79
07-21 55° 62° 3217 1779 708 234 82
07-22 54° 61° 3253 1805 724 241 84
07-23 58° 60° 3290 1832 741 251 89
07-24 57° 62° 3328 1860 759 260 93
07-25 55° 63° 3365 1887 776 269 97
07-26 57° 67° 3405 1917 796 281 104
07-27 63° 72° 3450 1952 821 299 117
07-28 67° 73° 3498 1990 849 319 132
07-29 64° 69° 3543 2025 874 335 143
07-30 64° 68° 3586 2058 897 351 154
07-31 63° 68° 3630 2092 921 366 164
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 65° 70° 3675 2127 946 384 177
08-02 65° 71° 3721 2163 972 402 190
08-03 63° 69° 3765 2197 996 418 201
08-04 63° 68° 3809 2231 1020 434 212
08-05 60° 67° 3851 2263 1042 447 220
08-06 60° 68° 3893 2295 1064 461 229
08-07 57° 68° 3934 2326 1085 474 237
08-08 61° 68° 3976 2358 1107 489 247
08-09 57° 63° 4014 2387 1126 499 252
08-10 57° 60° 4051 2413 1142 507 255
08-11 58° 66° 4091 2443 1162 520 263
08-12 58° 65° 4131 2473 1182 531 269
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 57° 67° 4171 2503 1202 543 276
08-14 59° 66° 4212 2534 1223 556 284
08-15 62° 67° 4254 2566 1245 571 294
08-16 63° 67° 4297 2599 1268 586 304
08-17 62° 65° 4339 2631 1290 599 312
08-18 62° 65° 4380 2662 1311 612 320
08-19 58° 63° 4418 2690 1329 623 326
08-20 55° 63° 4455 2717 1346 632 330
08-21 54° 66° 4493 2745 1364 641 334
08-22 58° 67° 4533 2775 1384 654 342
08-23 63° 67° 4576 2808 1407 668 351
08-24 63° 69° 4620 2842 1431 684 362
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 62° 70° 4663 2876 1455 700 373
08-26 67° 74° 4712 2914 1483 720 388
08-27 63° 70° 4756 2949 1508 737 400
08-28 59° 63° 4795 2977 1526 748 406
08-29 57° 65° 4835 3007 1546 759 412
08-30 64° 69° 4880 3042 1571 776 424
08-31 62° 72° 4925 3077 1596 793 436
09-01 60° 65° 4965 3107 1616 806 444
09-02 54° 66° 5004 3136 1635 816 449
09-03 59° 69° 5046 3168 1657 830 458
09-04 63° 69° 5090 3202 1681 846 469
09-05 55° 66° 5128 3231 1700 857 475
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 51° 55° 5160 3252 1711 860 475
09-07 51° 56° 5191 3273 1722 864 475
09-08 54° 64° 5229 3301 1740 873 479
09-09 56° 63° 5266 3328 1757 883 484
09-10 57° 66° 5305 3358 1777 894 490
09-11 61° 67° 5347 3389 1798 908 499
09-12 58° 64° 5386 3418 1817 918 504
09-13 58° 64° 5425 3447 1836 929 510
09-14 60° 66° 5466 3478 1857 942 518
09-15 64° 69° 5510 3512 1881 959 530
09-16 66° 71° 5556 3548 1907 977 543
09-17 64° 72° 5602 3585 1934 995 556
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 65° 71° 5648 3621 1960 1013 569
09-19 62° 69° 5692 3654 1983 1028 580
09-20 64° 69° 5736 3688 2007 1045 591
09-21 60° 66° 5777 3719 2028 1058 599
09-22 58° 66° 5817 3749 2048 1070 606
09-23 52° 61° 5852 3774 2063 1076 607
09-24 55° 62° 5888 3801 2080 1085 611
09-25 55° 65° 5927 3829 2098 1095 616
09-26 58° 66° 5967 3859 2118 1107 623
09-27 59° 68° 6008 3890 2139 1120 631
09-28 56° 66° 6047 3919 2158 1132 638
09-29 57° 65° 6086 3948 2177 1142 643
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 54° 68° 6125 3977 2196 1153 649

 

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.


 

 

© Copyright 2004-2025, Department of Crop and Soil Sciences, Michigan State University.
Weather data and programming assistance provided by Enviro-Weather and NWS
All Rights Reserved. Custom web development by Dynamite Inc.