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Japanese Beetle Adults Emerge, Breed and Feed (GDD 50)
through Sat, Dec. 13. 2025

 
  

Madison, WI

        

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° 2 0 0 0 0
02-16 7° 25° 2 0 0 0 0
02-17 -7° 6° 2 0 0 0 0
02-18 -10° 8° 2 0 0 0 0
02-19 -2° 10° 2 0 0 0 0
02-20 0° 23° 2 0 0 0 0
02-21 3° 25° 2 0 0 0 0
02-22 12° 27° 2 0 0 0 0
02-23 16° 35° 5 0 0 0 0
02-24 35° 51° 26 11 1 0 0
02-25 31° 49° 45 19 1 0 0
02-26 31° 44° 60 25 1 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 32° 44° 76 31 1 0 0
02-28 31° 54° 97 41 2 0 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 17° 30° 98 41 2 0 0
03-02 12° 35° 99 41 2 0 0
03-03 30° 47° 116 48 2 0 0
03-04 39° 49° 138 60 4 0 0
03-05 27° 42° 150 62 4 0 0
03-06 22° 39° 159 62 4 0 0
03-07 31° 37° 171 64 4 0 0
03-08 22° 48° 184 67 4 0 0
03-09 31° 60° 207 81 7 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 34° 67° 236 99 15 1 0
03-11 33° 53° 256 110 16 1 0
03-12 30° 52° 276 119 16 1 0
03-13 29° 64° 300 134 21 1 0
03-14 42° 77° 338 161 38 10 5
03-15 35° 58° 362 176 43 10 5
03-16 28° 40° 374 178 43 10 5
03-17 19° 57° 391 184 43 10 5
03-18 37° 61° 418 202 50 10 5
03-19 33° 41° 433 207 50 10 5
03-20 29° 39° 445 209 50 10 5
03-21 29° 59° 467 221 52 10 5
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 28° 45° 482 225 52 10 5
03-23 33° 47° 500 233 52 10 5
03-24 30° 46° 516 239 52 10 5
03-25 28° 48° 532 245 52 10 5
03-26 30° 54° 552 255 52 10 5
03-27 42° 59° 580 273 60 11 5
03-28 45° 79° 620 304 81 23 12
03-29 36° 69° 651 324 91 25 12
03-30 33° 39° 664 328 91 25 12
03-31 31° 45° 681 334 91 25 12
04-01 25° 41° 692 335 91 25 12
04-02 35° 66° 720 353 99 26 12
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 38° 50° 742 365 101 26 12
04-04 31° 50° 760 374 101 26 12
04-05 36° 49° 781 384 102 26 12
04-06 29° 52° 799 393 102 26 12
04-07 29° 43° 813 397 102 26 12
04-08 20° 43° 823 397 102 26 12
04-09 33° 49° 842 405 102 26 12
04-10 33° 43° 858 411 102 26 12
04-11 29° 54° 877 421 102 26 12
04-12 31° 62° 901 435 107 26 12
04-13 48° 62° 934 458 119 30 12
04-14 48° 58° 965 479 130 33 12
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 36° 53° 988 492 133 33 12
04-16 29° 54° 1007 501 133 33 12
04-17 37° 60° 1034 517 139 33 12
04-18 50° 65° 1069 543 155 41 15
04-19 44° 59° 1098 562 164 42 15
04-20 37° 52° 1121 574 166 42 15
04-21 44° 55° 1148 592 174 42 15
04-22 37° 70° 1180 614 186 46 15
04-23 45° 72° 1216 640 202 54 18
04-24 54° 72° 1257 671 223 67 26
04-25 46° 54° 1285 689 231 67 26
04-26 42° 59° 1313 707 239 67 26
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 38° 68° 1344 728 250 70 26
04-28 52° 84° 1390 764 276 88 39
04-29 50° 75° 1431 795 297 101 47
04-30 38° 66° 1461 814 306 103 47
05-01 47° 53° 1488 832 314 103 47
05-02 47° 58° 1519 852 324 105 47
05-03 43° 54° 1545 869 331 105 47
05-04 39° 64° 1575 888 340 106 47
05-05 45° 63° 1607 911 353 110 47
05-06 45° 77° 1646 940 372 121 53
05-07 52° 68° 1683 967 389 131 57
05-08 40° 64° 1713 987 399 133 57
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 34° 71° 1744 1008 410 135 57
05-10 52° 73° 1784 1038 430 148 65
05-11 39° 75° 1820 1063 445 155 67
05-12 45° 83° 1862 1096 468 169 76
05-13 59° 76° 1907 1131 493 187 89
05-14 57° 82° 1955 1169 521 207 103
05-15 58° 87° 2006 1209 551 229 121
05-16 56° 81° 2052 1246 578 248 135
05-17 50° 63° 2086 1270 592 254 136
05-18 47° 64° 2120 1294 606 259 136
05-19 39° 55° 2145 1309 611 259 136
05-20 42° 50° 2169 1323 615 259 136
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 45° 50° 2194 1338 620 259 136
05-22 44° 59° 2224 1358 630 261 136
05-23 43° 64° 2255 1379 641 265 136
05-24 41° 64° 2286 1400 652 267 136
05-25 44° 68° 2320 1424 666 273 137
05-26 43° 68° 2353 1447 679 278 137
05-27 54° 71° 2394 1477 699 291 145
05-28 54° 61° 2429 1503 715 298 147
05-29 49° 68° 2466 1530 732 307 151
05-30 49° 73° 2505 1559 751 318 157
05-31 48° 70° 2542 1586 768 328 162
06-01 43° 73° 2578 1612 784 336 165
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 51° 83° 2624 1648 810 353 177
06-03 63° 82° 2674 1688 840 376 195
06-04 58° 73° 2718 1722 864 391 205
06-05 52° 76° 2760 1753 885 405 214
06-06 58° 78° 2805 1789 911 422 226
06-07 56° 76° 2849 1823 935 438 237
06-08 54° 72° 2890 1854 956 452 246
06-09 55° 64° 2928 1882 974 461 250
06-10 53° 73° 2970 1913 995 475 259
06-11 60° 86° 3021 1954 1026 498 277
06-12 61° 77° 3067 1991 1053 517 291
06-13 54° 75° 3110 2024 1076 531 300
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 53° 79° 3154 2058 1100 547 311
06-15 59° 76° 3199 2093 1125 565 324
06-16 63° 81° 3250 2134 1156 587 341
06-17 66° 84° 3303 2177 1189 612 361
06-18 64° 74° 3350 2214 1216 631 375
06-19 62° 82° 3401 2254 1246 654 393
06-20 67° 85° 3454 2298 1280 680 414
06-21 74° 92° 3516 2349 1321 713 442
06-22 77° 92° 3578 2402 1364 747 471
06-23 68° 92° 3636 2450 1402 777 496
06-24 68° 82° 3689 2493 1435 802 516
06-25 70° 84° 3744 2538 1470 830 539
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 70° 90° 3802 2586 1508 859 563
06-27 68° 80° 3854 2628 1540 883 582
06-28 62° 83° 3905 2669 1571 906 600
06-29 70° 89° 3962 2716 1608 935 624
06-30 66° 84° 4015 2759 1641 960 644
07-01 63° 82° 4066 2799 1671 983 662
07-02 64° 86° 4118 2842 1704 1008 682
07-03 66° 89° 4174 2887 1739 1035 704
07-04 69° 87° 4230 2933 1775 1063 727
07-05 71° 88° 4288 2981 1813 1093 752
07-06 70° 80° 4341 3024 1846 1118 772
07-07 59° 81° 4389 3062 1874 1138 787
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 65° 83° 4440 3104 1906 1162 806
07-09 65° 81° 4491 3145 1937 1184 823
07-10 62° 81° 4541 3185 1967 1206 840
07-11 67° 76° 4591 3224 1996 1228 857
07-12 68° 82° 4643 3267 2029 1252 876
07-13 60° 80° 4691 3305 2057 1272 891
07-14 61° 84° 4742 3346 2088 1295 909
07-15 65° 86° 4795 3389 2121 1321 930
07-16 67° 85° 4849 3433 2155 1347 951
07-17 59° 69° 4891 3465 2177 1360 959
07-18 50° 77° 4933 3497 2199 1374 968
07-19 69° 84° 4987 3541 2233 1400 989
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 65° 77° 5036 3580 2262 1421 1005
07-21 57° 80° 5083 3617 2289 1440 1019
07-22 62° 85° 5134 3658 2320 1463 1037
07-23 71° 89° 5193 3706 2358 1494 1063
07-24 73° 81° 5248 3752 2394 1521 1085
07-25 69° 82° 5301 3795 2427 1546 1105
07-26 68° 83° 5355 3838 2460 1572 1126
07-27 67° 89° 5411 3885 2497 1600 1149
07-28 73° 90° 5470 3934 2536 1631 1175
07-29 71° 85° 5526 3980 2572 1659 1198
07-30 60° 73° 5570 4014 2596 1676 1210
07-31 59° 74° 5615 4049 2621 1692 1221
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 52° 75° 5656 4080 2642 1705 1229
08-02 50° 77° 5698 4112 2664 1719 1238
08-03 53° 77° 5741 4145 2687 1734 1248
08-04 55° 79° 5786 4180 2712 1751 1260
08-05 58° 81° 5834 4217 2739 1771 1275
08-06 57° 82° 5881 4255 2767 1790 1289
08-07 65° 88° 5936 4300 2802 1817 1311
08-08 70° 88° 5993 4347 2839 1846 1335
08-09 74° 87° 6052 4395 2877 1877 1361
08-10 67° 77° 6101 4435 2907 1898 1377
08-11 69° 82° 6155 4479 2941 1924 1398
08-12 68° 81° 6208 4522 2974 1949 1418
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 62° 80° 6257 4561 3003 1970 1434
08-14 59° 81° 6305 4599 3031 1991 1450
08-15 66° 86° 6360 4643 3065 2017 1471
08-16 68° 84° 6414 4688 3100 2043 1492
08-17 67° 78° 6464 4728 3130 2065 1509
08-18 66° 77° 6514 4768 3160 2087 1526
08-19 66° 79° 6565 4808 3190 2110 1544
08-20 66° 76° 6614 4847 3219 2131 1560
08-21 59° 76° 6659 4883 3245 2148 1572
08-22 60° 79° 6707 4921 3273 2168 1587
08-23 59° 74° 6751 4955 3297 2185 1599
08-24 54° 69° 6791 4985 3317 2197 1606
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 50° 67° 6828 5011 3333 2205 1609
08-26 49° 71° 6865 5039 3351 2214 1613
08-27 48° 73° 6904 5067 3369 2225 1619
08-28 58° 74° 6948 5101 3393 2241 1630
08-29 50° 66° 6984 5128 3410 2249 1633
08-30 57° 73° 7027 5161 3433 2264 1643
08-31 49° 74° 7066 5190 3452 2275 1649
09-01 49° 75° 7106 5220 3472 2287 1656
09-02 52° 76° 7148 5252 3494 2301 1665
09-03 52° 67° 7186 5280 3512 2311 1670
09-04 42° 62° 7216 5300 3522 2313 1670
09-05 50° 61° 7250 5324 3536 2319 1671
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 44° 63° 7282 5345 3547 2323 1671
09-07 42° 65° 7313 5367 3559 2326 1671
09-08 40° 71° 7346 5390 3572 2331 1671
09-09 52° 75° 7388 5422 3594 2345 1680
09-10 54° 74° 7430 5453 3615 2359 1689
09-11 56° 78° 7475 5488 3640 2376 1701
09-12 54° 82° 7521 5524 3666 2394 1714
09-13 64° 80° 7571 5565 3697 2416 1731
09-14 62° 83° 7622 5605 3727 2439 1749
09-15 60° 84° 7671 5645 3757 2461 1765
09-16 57° 85° 7721 5685 3787 2482 1782
09-17 58° 85° 7770 5724 3816 2503 1798
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 59° 84° 7820 5763 3845 2525 1815
09-19 64° 81° 7870 5804 3876 2548 1832
09-20 64° 76° 7918 5842 3904 2567 1847
09-21 60° 78° 7965 5879 3931 2586 1861
09-22 58° 78° 8011 5915 3957 2605 1874
09-23 60° 74° 8056 5950 3982 2621 1886
09-24 55° 65° 8094 5978 4000 2631 1891
09-25 49° 75° 8134 6008 4020 2643 1898
09-26 54° 84° 8181 6045 4047 2662 1912
09-27 58° 85° 8230 6084 4076 2684 1928
09-28 48° 80° 8272 6116 4098 2698 1937
09-29 53° 87° 8320 6154 4126 2718 1952
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 54° 83° 8367 6191 4153 2736 1966
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 27° 38° 10 0 0 0 0
02-16 13° 28° 10 0 0 0 0
02-17 10° 30° 10 0 0 0 0
02-18 24° 41° 21 1 0 0 0
02-19 20° 44° 32 2 0 0 0
02-20 27° 56° 51 11 0 0 0
02-21 40° 57° 77 27 7 0 0
02-22 32° 59° 101 41 10 0 0
02-23 20° 42° 110 41 10 0 0
02-24 12° 32° 110 41 10 0 0
02-25 32° 57° 133 53 12 0 0
02-26 31° 66° 159 70 19 0 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 46° 70° 195 96 35 8 3
02-28 14° 40° 200 96 35 8 3
02-29 12° 45° 207 96 35 8 3
03-01 31° 46° 223 102 35 8 3
03-02 32° 61° 248 117 39 8 3
03-03 43° 73° 284 143 55 16 6
03-04 36° 62° 311 160 62 16 6
03-05 35° 49° 331 170 62 16 6
03-06 31° 51° 349 178 62 16 6
03-07 33° 51° 369 188 62 16 6
03-08 37° 43° 387 196 62 16 6
03-09 29° 38° 399 198 62 16 6
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 26° 45° 412 201 62 16 6
03-11 30° 64° 437 216 67 16 6
03-12 48° 68° 473 242 83 24 9
03-13 35° 65° 501 260 91 24 9
03-14 38° 51° 524 272 94 24 9
03-15 32° 53° 544 283 94 24 9
03-16 38° 50° 566 295 96 24 9
03-17 29° 38° 577 296 96 24 9
03-18 23° 36° 585 296 96 24 9
03-19 30° 56° 606 307 97 24 9
03-20 25° 41° 617 308 97 24 9
03-21 23° 34° 623 308 97 24 9
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 28° 35° 632 308 97 24 9
03-23 17° 34° 636 308 97 24 9
03-24 28° 38° 647 309 97 24 9
03-25 38° 54° 671 323 102 24 9
03-26 31° 51° 691 333 102 24 9
03-27 27° 38° 701 333 102 24 9
03-28 28° 44° 716 338 102 24 9
03-29 25° 49° 731 343 102 24 9
03-30 36° 51° 753 355 103 24 9
03-31 35° 47° 771 363 103 24 9
04-01 34° 46° 790 372 103 24 9
04-02 33° 39° 804 376 103 24 9
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 33° 35° 816 378 103 24 9
04-04 33° 41° 831 383 103 24 9
04-05 31° 49° 850 392 103 24 9
04-06 30° 53° 869 401 103 24 9
04-07 36° 46° 888 410 103 24 9
04-08 44° 61° 918 430 114 27 9
04-09 41° 59° 946 448 122 27 9
04-10 44° 66° 979 471 135 32 9
04-11 45° 60° 1010 492 145 34 9
04-12 46° 60° 1040 512 156 37 9
04-13 38° 70° 1072 534 168 41 9
04-14 59° 81° 1120 572 196 61 24
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 42° 67° 1153 595 208 65 24
04-16 46° 66° 1187 619 223 72 25
04-17 55° 60° 1223 645 238 79 28
04-18 43° 49° 1247 659 242 79 28
04-19 36° 51° 1268 670 243 79 28
04-20 32° 39° 1281 673 243 79 28
04-21 30° 47° 1298 680 243 79 28
04-22 35° 64° 1325 697 251 79 28
04-23 50° 68° 1362 724 267 88 32
04-24 35° 51° 1383 735 268 88 32
04-25 31° 60° 1406 748 272 88 32
04-26 39° 58° 1433 765 278 88 32
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 54° 76° 1476 798 301 103 42
04-28 46° 63° 1508 820 313 107 42
04-29 52° 66° 1545 847 330 116 46
04-30 46° 69° 1580 872 346 124 48
05-01 58° 72° 1623 905 368 138 58
05-02 55° 71° 1664 936 389 151 66
05-03 50° 70° 1702 963 407 161 70
05-04 45° 73° 1738 990 424 170 74
05-05 43° 65° 1770 1012 436 173 74
05-06 44° 71° 1806 1038 451 181 77
05-07 54° 68° 1845 1067 470 192 83
05-08 46° 75° 1884 1095 489 203 88
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 52° 60° 1917 1119 503 209 89
05-10 45° 67° 1952 1143 517 215 90
05-11 48° 68° 1987 1169 533 223 93
05-12 47° 82° 2030 1202 555 237 103
05-13 59° 71° 2073 1235 578 252 113
05-14 49° 64° 2107 1259 593 259 114
05-15 46° 70° 2143 1285 609 267 117
05-16 49° 75° 2184 1316 629 279 125
05-17 51° 78° 2226 1348 652 294 134
05-18 54° 85° 2274 1386 679 313 149
05-19 59° 78° 2320 1422 706 332 162
05-20 58° 69° 2361 1453 727 345 170
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 57° 82° 2409 1491 754 364 185
05-22 57° 71° 2451 1523 776 378 194
05-23 53° 76° 2493 1555 799 393 203
05-24 55° 69° 2533 1585 818 404 210
05-25 48° 73° 2571 1613 837 415 215
05-26 54° 64° 2609 1641 854 424 220
05-27 55° 70° 2649 1671 875 437 227
05-28 51° 67° 2686 1698 892 446 231
05-29 49° 68° 2723 1725 908 454 235
05-30 46° 70° 2759 1751 924 462 238
05-31 48° 78° 2800 1782 946 476 246
06-01 59° 66° 2841 1813 966 488 254
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 57° 74° 2884 1846 990 504 264
06-03 60° 76° 2930 1882 1016 521 277
06-04 66° 81° 2982 1923 1047 545 295
06-05 64° 77° 3030 1962 1075 565 311
06-06 59° 70° 3072 1994 1098 580 320
06-07 56° 74° 3115 2027 1121 595 330
06-08 55° 67° 3154 2056 1140 605 336
06-09 54° 75° 3197 2089 1162 620 346
06-10 50° 72° 3235 2117 1181 631 351
06-11 48° 73° 3274 2146 1200 642 357
06-12 60° 87° 3326 2188 1231 665 376
06-13 66° 82° 3378 2230 1263 689 395
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 57° 78° 3423 2265 1289 706 407
06-15 57° 78° 3469 2301 1314 724 420
06-16 66° 88° 3524 2345 1349 751 441
06-17 71° 90° 3582 2394 1388 782 467
06-18 73° 89° 3641 2443 1427 813 493
06-19 71° 83° 3696 2488 1462 840 515
06-20 67° 75° 3746 2528 1491 861 532
06-21 67° 85° 3800 2572 1525 887 553
06-22 68° 79° 3851 2613 1556 910 571
06-23 66° 76° 3900 2652 1586 931 587
06-24 61° 82° 3950 2691 1615 953 603
06-25 75° 88° 4009 2741 1655 985 630
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 68° 82° 4063 2784 1688 1010 650
06-27 56° 72° 4105 2816 1710 1024 659
06-28 60° 73° 4149 2851 1734 1040 671
06-29 67° 84° 4202 2894 1767 1065 691
06-30 53° 72° 4242 2924 1787 1077 698
07-01 51° 73° 4282 2954 1807 1089 705
07-02 59° 72° 4325 2987 1831 1105 715
07-03 67° 84° 4379 3031 1864 1130 736
07-04 66° 82° 4431 3073 1896 1154 755
07-05 64° 74° 4478 3110 1923 1173 769
07-06 60° 79° 4526 3147 1951 1193 783
07-07 61° 83° 4576 3187 1981 1215 800
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 67° 81° 4628 3230 2013 1239 820
07-09 65° 80° 4678 3270 2044 1261 837
07-10 67° 81° 4730 3312 2076 1286 856
07-11 65° 80° 4781 3353 2106 1308 874
07-12 62° 83° 4831 3393 2137 1330 891
07-13 63° 86° 4884 3435 2169 1355 910
07-14 66° 84° 4937 3479 2202 1380 931
07-15 69° 86° 4992 3524 2238 1408 953
07-16 69° 82° 5046 3567 2271 1433 973
07-17 61° 74° 5091 3603 2297 1450 986
07-18 54° 74° 5133 3635 2319 1465 995
07-19 56° 77° 5178 3670 2343 1481 1007
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 62° 79° 5226 3708 2372 1501 1022
07-21 63° 78° 5275 3747 2400 1522 1038
07-22 60° 79° 5323 3784 2428 1542 1052
07-23 65° 78° 5372 3824 2458 1564 1069
07-24 64° 74° 5419 3861 2485 1583 1083
07-25 55° 77° 5464 3896 2509 1599 1095
07-26 56° 79° 5509 3931 2535 1617 1107
07-27 56° 83° 5556 3968 2562 1636 1121
07-28 65° 81° 5607 4009 2593 1659 1139
07-29 70° 81° 5661 4053 2626 1684 1160
07-30 64° 86° 5714 4096 2659 1709 1180
07-31 68° 90° 5771 4143 2696 1738 1204
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 68° 85° 5825 4187 2731 1764 1225
08-02 65° 86° 5879 4231 2764 1790 1246
08-03 67° 86° 5933 4275 2799 1817 1267
08-04 67° 87° 5988 4320 2833 1843 1289
08-05 70° 80° 6041 4363 2866 1868 1309
08-06 59° 74° 6085 4397 2890 1884 1320
08-07 55° 77° 6129 4431 2914 1900 1331
08-08 58° 76° 6174 4466 2939 1917 1343
08-09 51° 66° 6210 4492 2955 1925 1346
08-10 52° 72° 6250 4522 2975 1937 1353
08-11 53° 76° 6292 4554 2998 1952 1362
08-12 55° 80° 6338 4590 3023 1969 1375
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 58° 82° 6386 4628 3051 1989 1390
08-14 60° 83° 6435 4667 3081 2011 1406
08-15 66° 73° 6483 4705 3108 2030 1421
08-16 69° 84° 6537 4749 3143 2057 1442
08-17 67° 76° 6587 4789 3172 2078 1459
08-18 65° 78° 6637 4829 3202 2100 1476
08-19 58° 75° 6681 4863 3226 2116 1487
08-20 53° 70° 6721 4893 3246 2128 1494
08-21 49° 74° 6760 4922 3265 2139 1500
08-22 50° 75° 6800 4952 3286 2152 1507
08-23 55° 78° 6845 4987 3310 2168 1519
08-24 55° 85° 6893 5025 3339 2188 1534
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 67° 89° 6949 5071 3375 2216 1557
08-26 73° 92° 7010 5122 3415 2249 1585
08-27 74° 91° 7070 5172 3456 2282 1612
08-28 67° 85° 7124 5216 3490 2308 1633
08-29 65° 80° 7175 5257 3521 2330 1651
08-30 63° 78° 7223 5295 3549 2351 1666
08-31 55° 82° 7270 5332 3575 2369 1680
09-01 56° 74° 7313 5365 3598 2384 1690
09-02 47° 74° 7352 5394 3617 2395 1696
09-03 51° 75° 7393 5425 3638 2408 1704
09-04 48° 79° 7434 5456 3660 2422 1712
09-05 53° 77° 7478 5489 3683 2437 1722
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 51° 65° 7513 5515 3699 2445 1725
09-07 42° 64° 7545 5536 3710 2448 1725
09-08 43° 74° 7581 5563 3726 2456 1729
09-09 57° 80° 7627 5599 3753 2474 1742
09-10 50° 81° 7671 5633 3776 2490 1752
09-11 63° 84° 7722 5674 3807 2513 1771
09-12 53° 85° 7769 5711 3835 2532 1785
09-13 57° 84° 7818 5750 3863 2553 1801
09-14 60° 85° 7869 5790 3894 2576 1818
09-15 61° 87° 7921 5833 3926 2600 1837
09-16 59° 85° 7971 5873 3956 2622 1854
09-17 54° 86° 8018 5910 3984 2642 1869
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 51° 83° 8063 5945 4009 2658 1881
09-19 55° 86° 8112 5983 4037 2679 1896
09-20 63° 84° 8163 6025 4069 2703 1915
09-21 56° 87° 8213 6065 4098 2724 1931
09-22 55° 69° 8253 6095 4118 2736 1938
09-23 50° 67° 8289 6121 4135 2745 1942
09-24 55° 67° 8328 6150 4154 2756 1948
09-25 48° 73° 8367 6179 4172 2766 1954
09-26 52° 77° 8410 6211 4195 2781 1963
09-27 53° 75° 8451 6243 4217 2795 1972
09-28 57° 77° 8497 6278 4242 2812 1984
09-29 57° 78° 8542 6314 4268 2830 1997
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 56° 80° 8588 6350 4293 2847 2010

 

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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