Please Note

The GDD models have only been “ground-truthed” in the Great Lakes region. Use of models outside of this region, including the North East, Great Plains and Transition Zones, should be used with caution. We do not recommend the GDD models we use for the mid/southern transition zone and southern states.

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Japanese Beetle Adults Emerge, Breed and Feed (GDD 50)
forecast for Mon, Dec. 15. 2025

 
  

IA

        

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 24° 29° 4 0 0 0 0
02-16 6° 26° 4 0 0 0 0
02-17 -2° 7° 4 0 0 0 0
02-18 -8° 8° 4 0 0 0 0
02-19 2° 10° 4 0 0 0 0
02-20 -1° 17° 4 0 0 0 0
02-21 -0° 24° 4 0 0 0 0
02-22 12° 36° 6 0 0 0 0
02-23 25° 52° 23 7 0 0 0
02-24 39° 61° 51 25 8 0 0
02-25 34° 55° 74 37 11 0 0
02-26 37° 53° 97 51 14 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 33° 52° 118 61 15 0 0
02-28 35° 60° 143 77 20 0 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 21° 34° 149 77 20 0 0
03-02 15° 40° 154 77 20 0 0
03-03 31° 57° 176 89 22 0 0
03-04 45° 52° 202 105 28 0 0
03-05 31° 46° 219 112 28 0 0
03-06 23° 42° 230 112 28 0 0
03-07 32° 38° 243 115 28 0 0
03-08 27° 51° 260 123 28 0 0
03-09 29° 60° 282 135 31 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 33° 72° 313 156 41 3 0
03-11 41° 59° 341 173 49 3 0
03-12 30° 63° 365 188 54 3 0
03-13 34° 72° 397 209 65 6 0
03-14 55° 81° 443 245 91 24 13
03-15 35° 56° 466 259 95 24 13
03-16 29° 44° 481 264 95 24 13
03-17 23° 64° 503 275 96 24 13
03-18 39° 70° 535 298 109 29 13
03-19 35° 54° 558 310 112 29 13
03-20 30° 46° 574 316 112 29 13
03-21 30° 61° 597 330 115 29 13
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 26° 52° 614 337 115 29 13
03-23 38° 49° 636 348 117 29 13
03-24 31° 53° 656 358 117 29 13
03-25 39° 54° 681 373 121 29 13
03-26 32° 57° 703 386 124 29 13
03-27 43° 62° 734 406 135 32 13
03-28 52° 79° 778 440 159 47 24
03-29 61° 74° 823 476 184 65 37
03-30 41° 64° 854 496 194 67 37
03-31 35° 52° 875 508 196 67 37
04-01 31° 47° 893 515 196 67 37
04-02 44° 72° 929 542 213 76 40
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 41° 52° 953 556 217 76 40
04-04 34° 49° 973 565 217 76 40
04-05 40° 48° 995 577 219 76 40
04-06 31° 54° 1016 588 220 76 40
04-07 36° 45° 1034 597 220 76 40
04-08 23° 49° 1048 600 220 76 40
04-09 37° 61° 1075 617 227 76 40
04-10 35° 60° 1101 633 232 76 40
04-11 38° 57° 1126 648 238 76 40
04-12 34° 64° 1153 666 245 76 40
04-13 51° 74° 1194 696 266 88 48
04-14 52° 62° 1229 722 281 96 50
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 44° 59° 1258 741 290 97 50
04-16 32° 65° 1285 757 297 97 50
04-17 53° 65° 1322 784 314 106 54
04-18 55° 78° 1367 819 339 123 66
04-19 48° 61° 1399 842 351 128 66
04-20 46° 58° 1429 862 361 130 66
04-21 46° 61° 1461 883 373 133 66
04-22 41° 74° 1496 909 388 140 68
04-23 55° 78° 1541 944 413 157 80
04-24 51° 79° 1584 977 436 172 90
04-25 52° 67° 1622 1004 454 182 95
04-26 45° 62° 1654 1026 466 186 95
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 41° 70° 1687 1050 479 191 95
04-28 56° 85° 1736 1088 508 212 111
04-29 52° 78° 1779 1121 531 227 121
04-30 44° 63° 1811 1143 542 231 121
05-01 53° 63° 1847 1169 558 239 124
05-02 49° 62° 1880 1192 572 244 125
05-03 44° 58° 1909 1212 581 245 125
05-04 42° 67° 1942 1234 594 250 125
05-05 47° 64° 1975 1258 607 256 125
05-06 42° 76° 2012 1285 624 265 129
05-07 52° 82° 2057 1320 649 281 141
05-08 49° 71° 2095 1348 667 291 146
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 38° 72° 2128 1370 680 296 146
05-10 46° 82° 2170 1403 702 311 155
05-11 43° 80° 2210 1433 722 322 162
05-12 53° 84° 2257 1469 749 341 175
05-13 60° 82° 2305 1508 777 362 191
05-14 59° 85° 2356 1548 807 384 208
05-15 67° 92° 2413 1595 845 413 233
05-16 62° 86° 2465 1637 877 437 251
05-17 50° 67° 2501 1663 893 445 255
05-18 43° 74° 2537 1690 909 454 258
05-19 48° 60° 2570 1712 921 458 258
05-20 53° 65° 2606 1739 938 467 262
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 50° 57° 2638 1760 950 470 262
05-22 49° 62° 2672 1784 964 476 263
05-23 44° 70° 2707 1809 978 483 265
05-24 50° 70° 2744 1837 996 492 269
05-25 54° 63° 2781 1863 1013 501 273
05-26 45° 70° 2817 1889 1029 509 276
05-27 56° 74° 2860 1922 1052 524 286
05-28 55° 67° 2899 1951 1071 535 292
05-29 53° 72° 2939 1982 1091 548 300
05-30 53° 80° 2984 2017 1116 564 311
05-31 57° 82° 3032 2054 1144 584 326
06-01 51° 78° 3074 2087 1166 599 336
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 52° 87° 3122 2124 1194 618 350
06-03 67° 79° 3173 2165 1225 641 368
06-04 61° 70° 3216 2199 1248 657 379
06-05 55° 77° 3260 2233 1272 672 389
06-06 61° 79° 3308 2271 1300 693 405
06-07 56° 76° 3352 2305 1324 709 416
06-08 57° 80° 3399 2341 1351 727 429
06-09 53° 71° 3439 2371 1371 739 436
06-10 51° 80° 3482 2405 1394 754 446
06-11 64° 91° 3537 2450 1429 782 469
06-12 63° 85° 3589 2492 1461 805 487
06-13 63° 78° 3638 2530 1489 826 503
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 63° 82° 3688 2570 1520 848 520
06-15 64° 84° 3740 2612 1552 872 539
06-16 67° 86° 3794 2657 1586 899 561
06-17 68° 90° 3851 2704 1623 927 584
06-18 68° 75° 3900 2743 1652 949 601
06-19 64° 84° 3953 2785 1685 973 620
06-20 67° 86° 4007 2830 1719 999 641
06-21 76° 93° 4069 2882 1761 1034 671
06-22 77° 92° 4132 2934 1804 1068 700
06-23 76° 93° 4194 2987 1846 1102 729
06-24 72° 85° 4251 3033 1882 1131 753
06-25 72° 90° 4310 3082 1921 1162 779
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 75° 91° 4371 3133 1963 1195 807
06-27 70° 82° 4425 3178 1997 1221 828
06-28 63° 89° 4479 3222 2031 1247 849
06-29 71° 88° 4537 3269 2069 1277 874
06-30 70° 85° 4592 3315 2104 1304 896
07-01 64° 85° 4645 3357 2136 1329 916
07-02 64° 88° 4698 3401 2170 1354 936
07-03 63° 91° 4753 3446 2205 1381 958
07-04 73° 91° 4813 3495 2245 1413 985
07-05 72° 90° 4872 3544 2284 1444 1011
07-06 71° 85° 4928 3590 2320 1472 1034
07-07 66° 84° 4980 3633 2352 1497 1054
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 70° 82° 5034 3677 2386 1522 1074
07-09 67° 88° 5090 3722 2422 1550 1097
07-10 67° 87° 5145 3768 2457 1577 1119
07-11 67° 86° 5200 3812 2491 1604 1141
07-12 67° 82° 5252 3854 2524 1628 1160
07-13 64° 79° 5301 3894 2553 1650 1177
07-14 62° 84° 5352 3935 2584 1673 1195
07-15 65° 87° 5407 3979 2618 1699 1216
07-16 71° 85° 5463 4025 2654 1727 1239
07-17 67° 73° 5510 4063 2682 1747 1254
07-18 64° 79° 5560 4102 2711 1768 1270
07-19 70° 84° 5615 4147 2747 1795 1292
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 72° 84° 5671 4193 2782 1823 1315
07-21 66° 78° 5721 4233 2813 1845 1332
07-22 71° 87° 5778 4280 2850 1874 1356
07-23 76° 90° 5839 4331 2891 1907 1384
07-24 74° 84° 5896 4379 2928 1937 1409
07-25 73° 84° 5953 4426 2965 1965 1432
07-26 72° 84° 6009 4471 3001 1993 1455
07-27 73° 89° 6068 4520 3040 2024 1481
07-28 71° 88° 6125 4568 3077 2053 1505
07-29 71° 88° 6182 4615 3114 2083 1530
07-30 67° 79° 6233 4656 3145 2106 1548
07-31 63° 76° 6281 4693 3173 2125 1562
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 55° 77° 6325 4727 3197 2141 1573
08-02 56° 76° 6368 4761 3220 2157 1584
08-03 55° 78° 6413 4795 3245 2173 1595
08-04 59° 79° 6460 4832 3272 2192 1609
08-05 63° 82° 6510 4873 3302 2215 1627
08-06 61° 84° 6561 4913 3333 2237 1644
08-07 70° 85° 6616 4958 3368 2264 1666
08-08 71° 89° 6674 5007 3406 2294 1691
08-09 76° 87° 6734 5056 3446 2326 1718
08-10 72° 83° 6790 5102 3481 2354 1741
08-11 70° 83° 6844 5147 3516 2380 1762
08-12 69° 83° 6898 5190 3550 2406 1783
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 65° 82° 6949 5231 3581 2429 1801
08-14 60° 82° 6998 5270 3609 2450 1817
08-15 67° 89° 7053 5316 3645 2478 1840
08-16 69° 91° 7111 5364 3683 2508 1865
08-17 74° 90° 7171 5414 3723 2540 1892
08-18 73° 90° 7231 5463 3763 2571 1918
08-19 71° 81° 7285 5508 3797 2597 1939
08-20 67° 82° 7338 5550 3830 2622 1959
08-21 59° 79° 7385 5587 3857 2641 1973
08-22 62° 81° 7435 5627 3886 2663 1990
08-23 62° 78° 7483 5665 3915 2683 2005
08-24 54° 73° 7524 5697 3936 2697 2014
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 50° 70° 7562 5725 3954 2707 2019
08-26 47° 73° 7601 5753 3972 2717 2024
08-27 49° 73° 7639 5782 3991 2728 2030
08-28 61° 82° 7689 5821 4020 2749 2046
08-29 59° 79° 7736 5858 4048 2768 2060
08-30 62° 79° 7784 5897 4076 2788 2075
08-31 57° 77° 7829 5932 4101 2805 2087
09-01 53° 79° 7873 5966 4125 2821 2098
09-02 52° 79° 7917 5999 4149 2837 2109
09-03 56° 72° 7959 6031 4171 2851 2118
09-04 45° 67° 7993 6055 4185 2857 2119
09-05 52° 66° 8030 6082 4202 2866 2123
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 44° 67° 8063 6106 4215 2872 2124
09-07 41° 69° 8097 6129 4228 2877 2124
09-08 44° 74° 8134 6156 4246 2886 2128
09-09 49° 76° 8174 6187 4266 2898 2135
09-10 50° 82° 8218 6221 4290 2915 2147
09-11 54° 84° 8265 6258 4317 2934 2161
09-12 54° 88° 8315 6297 4347 2955 2177
09-13 71° 95° 8376 6349 4388 2988 2205
09-14 66° 93° 8434 6396 4425 3018 2230
09-15 66° 90° 8489 6442 4461 3046 2253
09-16 61° 91° 8543 6486 4495 3072 2274
09-17 59° 88° 8595 6528 4527 3095 2292
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 61° 83° 8645 6567 4557 3117 2309
09-19 66° 83° 8697 6610 4589 3141 2328
09-20 61° 77° 8744 6646 4616 3160 2342
09-21 60° 78° 8791 6684 4643 3179 2356
09-22 61° 83° 8841 6724 4673 3202 2374
09-23 60° 78° 8888 6761 4700 3220 2387
09-24 59° 76° 8934 6796 4726 3238 2400
09-25 52° 79° 8978 6830 4749 3254 2411
09-26 51° 86° 9024 6867 4776 3272 2424
09-27 54° 86° 9072 6905 4804 3292 2439
09-28 57° 88° 9123 6945 4835 3315 2457
09-29 54° 88° 9172 6985 4864 3336 2473
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 56° 88° 9222 7024 4894 3358 2490
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 34° 46° 18 8 0 0 0
02-16 18° 33° 22 8 0 0 0
02-17 11° 30° 22 8 0 0 0
02-18 26° 47° 36 12 0 0 0
02-19 21° 53° 51 17 0 0 0
02-20 27° 58° 72 28 1 0 0
02-21 44° 59° 102 48 11 2 0
02-22 42° 63° 132 69 21 5 0
02-23 30° 56° 154 80 23 5 0
02-24 19° 40° 161 80 23 5 0
02-25 31° 66° 188 96 29 5 0
02-26 32° 74° 219 117 40 7 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 35° 77° 253 141 54 13 1
02-28 15° 31° 253 141 54 13 1
02-29 16° 50° 264 142 54 13 1
03-01 32° 47° 282 150 54 13 1
03-02 29° 63° 306 164 58 13 1
03-03 47° 78° 346 194 78 26 8
03-04 42° 73° 382 220 94 33 11
03-05 40° 49° 405 233 97 33 11
03-06 32° 56° 427 245 99 33 11
03-07 39° 48° 449 256 101 33 11
03-08 40° 45° 469 267 101 33 11
03-09 30° 42° 483 271 101 33 11
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 27° 48° 499 277 101 33 11
03-11 32° 70° 528 296 110 35 11
03-12 50° 71° 567 325 129 45 17
03-13 45° 71° 603 351 145 53 20
03-14 46° 57° 632 370 155 55 20
03-15 38° 60° 660 387 162 55 20
03-16 39° 58° 686 404 168 55 20
03-17 29° 43° 700 408 168 55 20
03-18 22° 38° 708 408 168 55 20
03-19 27° 62° 731 420 171 55 20
03-20 31° 50° 749 429 171 55 20
03-21 30° 48° 766 436 171 55 20
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 34° 41° 782 441 171 55 20
03-23 27° 42° 795 444 171 55 20
03-24 34° 55° 817 457 174 55 20
03-25 50° 59° 850 479 186 59 20
03-26 32° 51° 869 489 186 59 20
03-27 27° 44° 883 493 186 59 20
03-28 30° 54° 903 502 186 59 20
03-29 35° 62° 929 519 193 59 20
03-30 43° 63° 961 540 204 63 20
03-31 40° 55° 986 556 209 63 20
04-01 42° 49° 1009 569 213 63 20
04-02 34° 44° 1027 576 213 63 20
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 33° 36° 1039 579 213 63 20
04-04 35° 44° 1057 587 213 63 20
04-05 38° 50° 1079 598 215 63 20
04-06 30° 55° 1099 609 215 63 20
04-07 42° 58° 1127 627 223 63 20
04-08 48° 68° 1163 653 239 71 23
04-09 41° 63° 1194 673 250 73 23
04-10 40° 68° 1226 696 262 77 23
04-11 48° 64° 1260 720 276 83 24
04-12 46° 63° 1293 743 289 88 24
04-13 37° 77° 1328 768 304 96 26
04-14 63° 84° 1380 810 336 120 45
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 51° 71° 1419 839 355 131 51
04-16 59° 76° 1465 875 381 148 64
04-17 56° 66° 1504 904 400 159 70
04-18 45° 51° 1530 920 406 159 70
04-19 36° 55° 1554 933 410 159 70
04-20 32° 42° 1569 939 410 159 70
04-21 31° 50° 1587 947 410 159 70
04-22 38° 65° 1617 967 419 161 70
04-23 55° 71° 1658 997 440 174 78
04-24 44° 60° 1687 1017 450 175 78
04-25 38° 63° 1716 1035 458 176 78
04-26 46° 62° 1748 1058 470 180 78
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 61° 78° 1796 1096 498 200 93
04-28 59° 72° 1839 1129 522 215 103
04-29 54° 68° 1878 1158 541 226 109
04-30 44° 77° 1917 1187 559 237 115
05-01 56° 73° 1959 1219 582 251 124
05-02 56° 71° 2001 1251 603 265 133
05-03 50° 75° 2042 1282 624 278 141
05-04 51° 78° 2084 1314 646 292 150
05-05 45° 70° 2119 1339 662 299 152
05-06 53° 76° 2162 1372 684 314 162
05-07 59° 75° 2207 1407 709 331 174
05-08 50° 80° 2250 1439 732 346 183
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 55° 66° 2288 1468 750 356 189
05-10 50° 70° 2326 1496 768 366 194
05-11 50° 75° 2366 1526 788 378 201
05-12 50° 84° 2411 1561 813 395 213
05-13 59° 75° 2456 1596 838 412 225
05-14 58° 63° 2494 1624 857 422 230
05-15 49° 76° 2535 1654 877 435 237
05-16 61° 76° 2581 1691 903 453 251
05-17 55° 81° 2627 1727 930 471 264
05-18 59° 86° 2678 1768 960 494 282
05-19 64° 85° 2731 1810 993 519 301
05-20 64° 85° 2783 1853 1026 543 321
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 68° 89° 2840 1900 1062 572 345
05-22 58° 75° 2884 1934 1087 588 356
05-23 53° 82° 2930 1969 1112 606 368
05-24 60° 74° 2975 2005 1137 623 381
05-25 51° 77° 3017 2037 1159 637 390
05-26 58° 78° 3063 2072 1185 655 402
05-27 56° 75° 3106 2106 1208 670 413
05-28 54° 71° 3146 2136 1229 682 420
05-29 51° 73° 3186 2166 1248 694 427
05-30 50° 76° 3228 2197 1270 708 435
05-31 55° 82° 3274 2234 1296 726 449
06-01 62° 69° 3317 2267 1320 741 459
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 56° 80° 3363 2303 1346 759 472
06-03 64° 89° 3418 2348 1380 786 494
06-04 71° 81° 3472 2392 1414 812 515
06-05 64° 83° 3523 2433 1446 835 533
06-06 61° 81° 3573 2473 1475 857 550
06-07 59° 82° 3622 2511 1504 878 565
06-08 60° 76° 3668 2547 1530 896 578
06-09 53° 82° 3713 2583 1555 913 591
06-10 57° 75° 3757 2617 1579 929 602
06-11 50° 82° 3801 2651 1603 945 613
06-12 64° 93° 3857 2697 1640 973 636
06-13 74° 92° 3918 2748 1680 1006 664
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 61° 87° 3970 2790 1712 1030 683
06-15 62° 86° 4022 2832 1744 1054 702
06-16 72° 90° 4081 2881 1784 1085 728
06-17 76° 94° 4144 2934 1826 1120 758
06-18 73° 91° 4205 2984 1867 1153 785
06-19 74° 88° 4263 3033 1906 1183 811
06-20 71° 86° 4320 3080 1942 1212 835
06-21 73° 91° 4380 3130 1982 1244 862
06-22 77° 91° 4442 3182 2024 1278 891
06-23 70° 85° 4498 3227 2060 1306 913
06-24 65° 88° 4552 3272 2095 1332 935
06-25 71° 91° 4611 3321 2134 1363 961
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 71° 88° 4669 3369 2171 1393 986
06-27 61° 80° 4718 3408 2200 1414 1002
06-28 60° 73° 4762 3442 2225 1430 1013
06-29 69° 85° 4818 3487 2260 1458 1035
06-30 57° 74° 4861 3521 2284 1473 1046
07-01 53° 74° 4903 3553 2305 1487 1055
07-02 66° 86° 4957 3597 2339 1513 1076
07-03 72° 83° 5012 3642 2375 1540 1098
07-04 68° 81° 5065 3685 2407 1565 1118
07-05 64° 75° 5112 3722 2435 1584 1132
07-06 61° 81° 5162 3761 2464 1606 1148
07-07 65° 78° 5211 3801 2493 1627 1165
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 63° 81° 5261 3841 2523 1649 1182
07-09 64° 79° 5311 3880 2553 1671 1198
07-10 66° 85° 5364 3924 2587 1696 1219
07-11 62° 81° 5413 3963 2616 1717 1235
07-12 62° 85° 5465 4005 2647 1741 1254
07-13 70° 90° 5523 4053 2685 1771 1279
07-14 71° 91° 5582 4102 2724 1802 1305
07-15 69° 92° 5640 4150 2763 1832 1330
07-16 66° 84° 5693 4193 2796 1857 1350
07-17 64° 80° 5743 4233 2825 1879 1367
07-18 56° 76° 5787 4267 2849 1895 1378
07-19 56° 78° 5832 4302 2874 1912 1390
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 59° 78° 5879 4339 2901 1931 1404
07-21 62° 82° 5929 4379 2931 1953 1421
07-22 62° 84° 5979 4419 2962 1975 1438
07-23 63° 83° 6031 4461 2993 1999 1457
07-24 65° 79° 6081 4501 3023 2021 1474
07-25 63° 81° 6131 4541 3053 2043 1491
07-26 60° 83° 6181 4580 3083 2065 1507
07-27 61° 85° 6231 4621 3114 2087 1525
07-28 69° 86° 6287 4667 3149 2115 1548
07-29 70° 84° 6342 4712 3184 2142 1570
07-30 68° 84° 6396 4756 3218 2168 1591
07-31 69° 86° 6452 4802 3254 2196 1614
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 72° 85° 6508 4848 3290 2224 1637
08-02 69° 86° 6563 4893 3326 2251 1659
08-03 68° 88° 6619 4939 3361 2279 1682
08-04 69° 90° 6676 4986 3399 2308 1706
08-05 75° 91° 6738 5037 3440 2342 1734
08-06 65° 80° 6788 5078 3470 2364 1752
08-07 59° 79° 6835 5115 3497 2383 1766
08-08 58° 79° 6882 5151 3524 2402 1779
08-09 53° 71° 6922 5182 3544 2414 1787
08-10 52° 74° 6963 5213 3565 2427 1795
08-11 51° 79° 7006 5246 3588 2442 1805
08-12 58° 79° 7052 5282 3615 2460 1818
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 60° 79° 7100 5320 3642 2480 1833
08-14 57° 80° 7146 5356 3669 2498 1846
08-15 69° 80° 7199 5398 3701 2523 1865
08-16 65° 85° 7252 5441 3734 2548 1885
08-17 67° 80° 7303 5483 3766 2571 1904
08-18 65° 81° 7354 5524 3797 2594 1922
08-19 61° 77° 7401 5561 3824 2613 1936
08-20 59° 75° 7446 5596 3849 2630 1948
08-21 55° 75° 7489 5629 3872 2645 1958
08-22 51° 76° 7530 5660 3893 2658 1966
08-23 54° 81° 7576 5696 3918 2676 1979
08-24 61° 89° 7629 5739 3951 2701 1999
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 74° 91° 7689 5789 3992 2733 2026
08-26 74° 94° 7751 5841 4034 2767 2055
08-27 76° 97° 7816 5895 4078 2804 2086
08-28 69° 84° 7870 5940 4112 2830 2108
08-29 69° 88° 7927 5986 4149 2859 2131
08-30 66° 78° 7976 6026 4179 2880 2148
08-31 56° 81° 8023 6063 4205 2899 2162
09-01 61° 77° 8070 6100 4232 2918 2176
09-02 52° 75° 8111 6131 4254 2931 2184
09-03 50° 76° 8153 6162 4275 2945 2192
09-04 49° 79° 8194 6194 4297 2958 2201
09-05 54° 83° 8241 6231 4323 2977 2215
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 56° 71° 8282 6262 4345 2990 2223
09-07 46° 67° 8317 6287 4359 2997 2225
09-08 40° 73° 8352 6311 4374 3004 2226
09-09 48° 78° 8393 6343 4395 3017 2235
09-10 48° 81° 8435 6375 4418 3031 2244
09-11 52° 85° 8482 6412 4444 3050 2258
09-12 54° 86° 8530 6450 4472 3070 2273
09-13 61° 82° 8579 6489 4502 3091 2289
09-14 64° 88° 8633 6533 4536 3117 2310
09-15 64° 88° 8687 6577 4570 3143 2331
09-16 61° 86° 8739 6619 4601 3167 2350
09-17 56° 87° 8788 6658 4631 3188 2366
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 52° 86° 8836 6696 4658 3208 2381
09-19 60° 90° 8889 6739 4691 3233 2401
09-20 66° 91° 8945 6785 4727 3261 2424
09-21 59° 88° 8996 6826 4759 3284 2442
09-22 61° 74° 9042 6862 4784 3302 2455
09-23 55° 69° 9082 6892 4804 3314 2462
09-24 58° 74° 9126 6926 4828 3330 2473
09-25 50° 78° 9167 6957 4850 3343 2481
09-26 51° 80° 9211 6991 4873 3359 2492
09-27 59° 76° 9256 7026 4899 3376 2504
09-28 61° 83° 9307 7066 4929 3399 2521
09-29 57° 83° 9354 7104 4957 3418 2536
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 55° 82° 9401 7141 4983 3437 2550

 

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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