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)
through Sun, Dec. 14. 2025

 
  

Mountain Top, PA

        

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° 30° 3 0 0 0 0
02-16 28° 40° 16 2 0 0 0
02-17 17° 28° 16 2 0 0 0
02-18 10° 20° 16 2 0 0 0
02-19 8° 23° 16 2 0 0 0
02-20 13° 19° 16 2 0 0 0
02-21 15° 28° 16 2 0 0 0
02-22 18° 37° 21 2 0 0 0
02-23 25° 40° 32 3 0 0 0
02-24 25° 48° 46 7 0 0 0
02-25 35° 52° 68 19 2 0 0
02-26 31° 48° 86 27 2 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 37° 48° 107 37 3 0 0
02-28 33° 43° 123 44 3 0 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 20° 51° 136 47 3 0 0
03-02 12° 27° 136 47 3 0 0
03-03 17° 34° 139 47 3 0 0
03-04 26° 50° 155 53 3 0 0
03-05 42° 52° 180 68 8 0 0
03-06 30° 50° 198 76 8 0 0
03-07 29° 43° 212 80 8 0 0
03-08 29° 38° 224 82 8 0 0
03-09 25° 49° 239 87 8 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 35° 60° 265 102 14 0 0
03-11 35° 66° 293 121 22 1 0
03-12 29° 50° 311 129 22 1 0
03-13 31° 54° 332 140 23 1 0
03-14 30° 57° 353 151 24 1 0
03-15 38° 47° 374 161 25 1 0
03-16 48° 63° 407 185 38 6 0
03-17 29° 51° 426 193 38 6 0
03-18 28° 57° 446 204 39 6 0
03-19 35° 67° 475 223 48 7 0
03-20 42° 64° 506 244 59 10 0
03-21 29° 46° 522 249 59 10 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 32° 52° 542 260 59 10 0
03-23 22° 41° 552 260 59 10 0
03-24 34° 53° 573 271 60 10 0
03-25 36° 52° 595 283 62 10 0
03-26 30° 39° 607 285 62 10 0
03-27 25° 47° 621 289 62 10 0
03-28 36° 56° 645 303 66 10 0
03-29 47° 75° 685 333 86 22 7
03-30 42° 54° 711 349 92 22 7
03-31 48° 72° 749 377 110 32 12
04-01 31° 47° 766 384 110 32 12
04-02 28° 45° 781 389 110 32 12
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 39° 71° 814 412 123 37 12
04-04 51° 64° 850 438 139 45 15
04-05 44° 53° 876 454 146 45 15
04-06 40° 47° 897 465 147 45 15
04-07 32° 39° 911 469 147 45 15
04-08 27° 37° 921 469 147 45 15
04-09 23° 43° 933 471 147 45 15
04-10 33° 42° 948 476 147 45 15
04-11 34° 42° 964 482 147 45 15
04-12 34° 39° 979 487 147 45 15
04-13 38° 54° 1003 501 151 45 15
04-14 32° 63° 1028 516 156 45 15
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 42° 60° 1057 535 165 46 15
04-16 35° 41° 1074 542 165 46 15
04-17 33° 57° 1097 555 168 46 15
04-18 34° 67° 1125 573 177 47 15
04-19 57° 81° 1172 610 204 65 29
04-20 46° 66° 1206 634 218 72 30
04-21 41° 59° 1234 652 226 72 30
04-22 52° 67° 1272 680 244 82 35
04-23 46° 72° 1309 707 260 90 39
04-24 46° 78° 1349 737 280 102 46
04-25 53° 73° 1389 768 301 115 54
04-26 46° 70° 1425 794 317 123 57
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 42° 62° 1455 813 327 125 57
04-28 38° 71° 1488 836 340 130 57
04-29 48° 78° 1529 867 360 142 64
04-30 49° 65° 1564 892 375 149 66
05-01 42° 75° 1600 918 392 158 70
05-02 58° 75° 1645 953 417 175 82
05-03 55° 73° 1687 985 439 189 90
05-04 57° 65° 1726 1014 458 200 97
05-05 59° 64° 1766 1044 477 211 103
05-06 51° 67° 1802 1070 494 220 107
05-07 48° 67° 1838 1096 509 227 109
05-08 50° 69° 1875 1123 526 236 113
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 44° 48° 1899 1137 530 236 113
05-10 42° 69° 1932 1160 544 242 114
05-11 42° 69° 1966 1184 557 247 114
05-12 44° 77° 2004 1212 576 258 120
05-13 58° 62° 2042 1240 594 268 125
05-14 56° 60° 2078 1266 610 276 128
05-15 59° 69° 2120 1298 632 290 137
05-16 58° 75° 2165 1333 657 307 148
05-17 58° 79° 2211 1369 683 325 162
05-18 52° 64° 2248 1396 699 333 165
05-19 46° 63° 2280 1418 711 337 165
05-20 38° 58° 2306 1434 718 337 165
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 44° 49° 2331 1449 722 337 165
05-22 44° 49° 2355 1463 727 337 165
05-23 44° 57° 2384 1482 735 338 165
05-24 41° 58° 2411 1499 743 338 165
05-25 47° 62° 2443 1521 755 342 165
05-26 42° 67° 2476 1544 767 346 165
05-27 44° 68° 2510 1568 781 352 166
05-28 51° 56° 2541 1589 793 356 166
05-29 51° 68° 2578 1617 810 365 171
05-30 56° 72° 2621 1649 832 380 180
05-31 46° 58° 2651 1669 843 382 180
06-01 45° 60° 2682 1690 853 385 180
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 41° 65° 2713 1711 864 388 180
06-03 44° 74° 2750 1738 881 397 184
06-04 53° 84° 2796 1774 908 415 197
06-05 61° 84° 2847 1815 938 437 215
06-06 63° 77° 2894 1852 966 457 230
06-07 63° 73° 2941 1889 992 476 243
06-08 55° 72° 2982 1920 1014 489 251
06-09 58° 71° 3025 1953 1036 504 261
06-10 60° 75° 3070 1988 1062 521 274
06-11 52° 75° 3112 2020 1084 535 283
06-12 60° 81° 3160 2059 1112 555 298
06-13 58° 74° 3205 2093 1136 572 309
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 56° 64° 3243 2121 1154 581 314
06-15 55° 61° 3279 2147 1171 590 317
06-16 57° 61° 3316 2174 1188 599 321
06-17 59° 68° 3358 2206 1209 612 330
06-18 66° 77° 3407 2245 1239 634 346
06-19 64° 84° 3459 2287 1271 658 365
06-20 58° 77° 3504 2323 1296 675 378
06-21 62° 83° 3555 2363 1327 698 396
06-22 69° 89° 3612 2411 1364 727 420
06-23 72° 91° 3672 2460 1404 759 446
06-24 69° 91° 3730 2508 1442 789 471
06-25 68° 88° 3786 2554 1477 816 494
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 62° 83° 3836 2594 1508 839 512
06-27 58° 62° 3874 2622 1526 849 516
06-28 57° 79° 3920 2658 1552 867 529
06-29 67° 82° 3973 2701 1584 892 549
06-30 64° 84° 4025 2743 1616 916 568
07-01 69° 82° 4078 2786 1650 941 588
07-02 67° 81° 4130 2828 1682 965 607
07-03 58° 80° 4177 2865 1709 984 621
07-04 53° 76° 4220 2898 1731 998 631
07-05 54° 81° 4265 2933 1757 1016 644
07-06 64° 83° 4317 2975 1788 1039 662
07-07 68° 85° 4371 3019 1823 1066 683
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 68° 83° 4425 3063 1856 1091 704
07-09 70° 81° 4478 3106 1889 1117 724
07-10 67° 82° 4530 3148 1922 1141 744
07-11 65° 85° 4583 3192 1955 1166 764
07-12 69° 83° 4637 3235 1989 1192 785
07-13 71° 79° 4691 3279 2022 1217 805
07-14 67° 81° 4742 3321 2054 1241 824
07-15 67° 84° 4796 3364 2087 1267 844
07-16 68° 84° 4850 3408 2121 1292 865
07-17 70° 86° 4906 3454 2157 1320 888
07-18 62° 75° 4952 3490 2184 1339 901
07-19 60° 71° 4996 3524 2207 1355 912
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 67° 82° 5048 3566 2240 1379 931
07-21 60° 76° 5094 3602 2266 1397 944
07-22 54° 76° 5137 3635 2289 1412 955
07-23 58° 80° 5184 3672 2316 1431 969
07-24 64° 84° 5236 3714 2348 1455 988
07-25 69° 86° 5292 3760 2384 1483 1010
07-26 65° 80° 5343 3801 2414 1506 1028
07-27 68° 83° 5396 3844 2448 1531 1049
07-28 66° 86° 5450 3889 2482 1557 1070
07-29 68° 88° 5507 3935 2518 1586 1093
07-30 69° 87° 5563 3981 2554 1613 1116
07-31 62° 73° 5608 4016 2580 1631 1128
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 57° 72° 5651 4049 2602 1646 1138
08-02 51° 73° 5691 4079 2623 1658 1145
08-03 50° 78° 5733 4111 2645 1672 1154
08-04 54° 80° 5778 4146 2670 1689 1166
08-05 57° 82° 5826 4184 2698 1709 1181
08-06 63° 75° 5873 4221 2725 1728 1195
08-07 56° 77° 5917 4256 2749 1744 1207
08-08 56° 79° 5963 4291 2774 1762 1219
08-09 55° 82° 6009 4327 2801 1780 1232
08-10 57° 84° 6058 4366 2829 1800 1248
08-11 56° 85° 6106 4404 2858 1821 1263
08-12 62° 87° 6159 4447 2890 1845 1283
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 68° 83° 6212 4490 2924 1871 1303
08-14 68° 86° 6267 4535 2959 1898 1325
08-15 66° 84° 6320 4578 2992 1923 1345
08-16 68° 83° 6374 4622 3025 1948 1366
08-17 65° 83° 6426 4664 3058 1973 1385
08-18 61° 77° 6473 4701 3085 1992 1399
08-19 59° 74° 6518 4736 3109 2008 1411
08-20 56° 64° 6556 4764 3128 2019 1416
08-21 54° 70° 6596 4794 3148 2031 1423
08-22 52° 78° 6639 4827 3171 2046 1433
08-23 56° 78° 6684 4862 3196 2063 1445
08-24 64° 72° 6730 4898 3222 2081 1458
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 60° 75° 6775 4934 3247 2098 1471
08-26 49° 69° 6813 4961 3265 2108 1475
08-27 47° 68° 6848 4986 3280 2115 1478
08-28 46° 72° 6886 5014 3297 2125 1482
08-29 54° 69° 6925 5043 3317 2136 1488
08-30 43° 69° 6959 5067 3331 2142 1489
08-31 45° 73° 6996 5094 3348 2151 1493
09-01 50° 74° 7036 5124 3368 2163 1500
09-02 49° 73° 7075 5153 3387 2174 1506
09-03 51° 76° 7117 5185 3408 2187 1515
09-04 56° 76° 7160 5218 3432 2203 1526
09-05 58° 78° 7206 5254 3458 2221 1539
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 60° 72° 7250 5288 3482 2237 1549
09-07 55° 69° 7290 5319 3502 2249 1557
09-08 43° 68° 7324 5342 3516 2255 1557
09-09 44° 71° 7360 5368 3531 2263 1560
09-10 50° 74° 7400 5398 3551 2275 1567
09-11 49° 75° 7440 5428 3572 2287 1574
09-12 51° 75° 7481 5459 3593 2300 1582
09-13 54° 78° 7525 5493 3616 2316 1593
09-14 54° 78° 7569 5527 3641 2332 1604
09-15 54° 77° 7613 5561 3664 2348 1615
09-16 54° 74° 7655 5593 3686 2362 1624
09-17 57° 73° 7698 5626 3709 2377 1634
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 56° 81° 7744 5662 3736 2395 1648
09-19 53° 77° 7787 5695 3759 2410 1658
09-20 48° 76° 7827 5725 3779 2422 1664
09-21 53° 69° 7866 5754 3798 2433 1671
09-22 56° 71° 7908 5786 3820 2447 1679
09-23 60° 75° 7953 5821 3845 2464 1692
09-24 62° 73° 7999 5857 3871 2482 1704
09-25 63° 71° 8044 5892 3896 2499 1716
09-26 59° 74° 8089 5927 3921 2516 1728
09-27 54° 74° 8131 5959 3943 2530 1738
09-28 56° 80° 8177 5995 3969 2548 1750
09-29 54° 73° 8219 6027 3990 2561 1759
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 54° 76° 8261 6059 4013 2576 1769
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 13° 34° 2 0 0 0 0
02-16 26° 34° 9 0 0 0 0
02-17 19° 28° 11 0 0 0 0
02-18 12° 32° 11 0 0 0 0
02-19 20° 33° 16 0 0 0 0
02-20 13° 35° 18 0 0 0 0
02-21 19° 36° 23 0 0 0 0
02-22 29° 36° 33 0 0 0 0
02-23 34° 42° 49 6 0 0 0
02-24 17° 35° 53 6 0 0 0
02-25 13° 39° 57 6 0 0 0
02-26 31° 55° 79 17 1 0 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 37° 57° 104 33 7 0 0
02-28 33° 57° 127 45 9 0 0
02-29 25° 33° 134 45 9 0 0
03-01 19° 44° 143 45 9 0 0
03-02 32° 46° 161 53 9 0 0
03-03 41° 55° 187 69 15 0 0
03-04 45° 60° 217 89 26 3 0
03-05 42° 46° 240 102 28 3 0
03-06 45° 51° 265 117 34 3 0
03-07 37° 49° 286 128 35 3 0
03-08 31° 52° 306 138 35 3 0
03-09 35° 39° 321 143 35 3 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 32° 40° 335 147 35 3 0
03-11 31° 47° 352 154 35 3 0
03-12 36° 61° 379 171 42 3 0
03-13 38° 67° 409 191 53 5 0
03-14 42° 70° 443 215 66 11 1
03-15 42° 63° 473 235 77 13 1
03-16 35° 54° 496 248 79 13 1
03-17 38° 51° 518 260 81 13 1
03-18 31° 38° 530 262 81 13 1
03-19 29° 38° 542 264 81 13 1
03-20 28° 41° 555 267 81 13 1
03-21 21° 34° 560 267 81 13 1
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 17° 38° 566 267 81 13 1
03-23 27° 39° 577 268 81 13 1
03-24 25° 40° 587 268 81 13 1
03-25 27° 54° 606 277 81 13 1
03-26 32° 57° 628 289 84 13 1
03-27 39° 47° 649 300 85 13 1
03-28 37° 44° 668 309 85 13 1
03-29 33° 46° 685 316 85 13 1
03-30 32° 52° 705 326 85 13 1
03-31 39° 53° 729 340 89 13 1
04-01 40° 47° 750 351 90 13 1
04-02 40° 45° 771 362 91 13 1
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 37° 41° 788 369 91 13 1
04-04 34° 43° 805 376 91 13 1
04-05 34° 41° 820 381 91 13 1
04-06 35° 45° 838 389 91 13 1
04-07 37° 57° 863 404 96 13 1
04-08 31° 61° 887 418 100 13 1
04-09 39° 74° 922 443 115 20 3
04-10 53° 65° 959 470 132 29 6
04-11 52° 65° 996 497 148 38 10
04-12 49° 61° 1029 520 162 43 10
04-13 39° 48° 1050 531 163 43 10
04-14 38° 74° 1084 555 177 48 11
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 51° 69° 1122 583 195 58 16
04-16 42° 63° 1153 604 205 61 16
04-17 46° 59° 1183 624 216 63 16
04-18 46° 51° 1210 641 223 63 16
04-19 41° 51° 1234 655 227 63 16
04-20 40° 60° 1262 673 235 63 16
04-21 30° 42° 1276 677 235 63 16
04-22 31° 58° 1299 690 238 63 16
04-23 34° 64° 1326 707 245 63 16
04-24 41° 61° 1355 726 254 65 16
04-25 32° 57° 1378 739 256 65 16
04-26 31° 61° 1402 753 260 65 16
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 38° 52° 1425 766 263 65 16
04-28 45° 77° 1464 795 282 76 22
04-29 56° 83° 1511 832 310 95 36
04-30 59° 80° 1558 869 337 114 50
05-01 54° 75° 1601 902 360 129 60
05-02 54° 81° 1646 937 385 146 73
05-03 51° 67° 1683 964 402 155 76
05-04 45° 55° 1711 982 409 155 76
05-05 45° 51° 1737 998 415 155 76
05-06 52° 69° 1775 1026 434 166 82
05-07 50° 76° 1816 1057 455 179 90
05-08 62° 81° 1866 1097 485 200 107
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 53° 64° 1902 1123 501 209 110
05-10 44° 51° 1928 1139 507 209 110
05-11 40° 57° 1954 1155 513 209 110
05-12 42° 52° 1980 1171 518 209 110
05-13 46° 67° 2014 1195 533 215 111
05-14 50° 67° 2050 1221 549 223 114
05-15 56° 63° 2088 1249 567 233 119
05-16 54° 66° 2127 1278 585 244 125
05-17 55° 66° 2165 1306 604 254 130
05-18 57° 63° 2203 1334 622 264 135
05-19 59° 74° 2248 1369 646 280 147
05-20 55° 79° 2293 1404 671 297 159
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 57° 83° 2340 1441 699 317 173
05-22 58° 83° 2389 1480 728 338 189
05-23 61° 75° 2435 1516 754 356 202
05-24 54° 78° 2479 1550 777 372 213
05-25 53° 82° 2524 1585 803 389 225
05-26 61° 79° 2572 1623 831 409 240
05-27 63° 72° 2618 1659 856 427 253
05-28 57° 72° 2660 1691 879 441 262
05-29 54° 68° 2699 1720 897 451 268
05-30 48° 64° 2733 1744 912 458 269
05-31 43° 70° 2768 1769 926 464 271
06-01 45° 75° 2806 1797 944 474 276
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 52° 76° 2848 1829 966 489 285
06-03 56° 77° 2893 1864 991 505 297
06-04 60° 82° 2941 1902 1020 526 312
06-05 61° 77° 2988 1939 1047 545 326
06-06 66° 80° 3039 1980 1078 568 344
06-07 58° 75° 3084 2015 1103 585 356
06-08 53° 72° 3124 2045 1123 597 363
06-09 54° 71° 3165 2076 1144 610 371
06-10 53° 68° 3204 2105 1162 621 377
06-11 54° 65° 3241 2132 1180 630 381
06-12 48° 73° 3280 2161 1199 641 387
06-13 52° 82° 3325 2196 1223 658 399
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 60° 76° 3371 2232 1250 676 412
06-15 54° 74° 3413 2264 1272 690 421
06-16 48° 76° 3453 2294 1292 702 428
06-17 62° 84° 3504 2335 1323 725 446
06-18 68° 87° 3559 2380 1358 752 468
06-19 69° 88° 3615 2426 1394 780 491
06-20 66° 89° 3671 2472 1429 808 514
06-21 67° 91° 3728 2519 1467 837 538
06-22 68° 88° 3784 2565 1503 865 561
06-23 71° 86° 3841 2612 1539 894 585
06-24 65° 73° 3888 2649 1566 913 599
06-25 60° 81° 3936 2687 1595 933 614
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 64° 86° 3989 2730 1628 958 634
06-27 60° 76° 4035 2766 1654 976 647
06-28 50° 75° 4076 2797 1674 989 655
06-29 62° 77° 4123 2834 1702 1008 669
06-30 65° 84° 4176 2877 1734 1032 689
07-01 57° 72° 4218 2909 1757 1047 698
07-02 52° 78° 4261 2942 1780 1062 708
07-03 59° 81° 4309 2980 1808 1082 723
07-04 66° 86° 4363 3024 1842 1108 744
07-05 68° 84° 4417 3068 1876 1134 765
07-06 71° 87° 4474 3115 1913 1163 789
07-07 68° 85° 4529 3160 1947 1189 811
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 63° 88° 4582 3203 1981 1215 831
07-09 70° 91° 4641 3252 2019 1246 857
07-10 73° 90° 4700 3301 2059 1277 883
07-11 66° 74° 4748 3339 2087 1297 898
07-12 63° 77° 4796 3377 2115 1317 913
07-13 66° 86° 4850 3421 2149 1343 934
07-14 66° 86° 4904 3465 2183 1369 955
07-15 70° 89° 4962 3513 2220 1399 980
07-16 66° 90° 5018 3559 2257 1427 1003
07-17 68° 86° 5073 3604 2291 1454 1025
07-18 65° 79° 5122 3643 2321 1475 1041
07-19 56° 77° 5167 3678 2346 1492 1053
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 58° 78° 5213 3714 2372 1510 1066
07-21 64° 82° 5264 3755 2403 1533 1084
07-22 61° 76° 5311 3792 2429 1552 1098
07-23 66° 77° 5360 3831 2459 1573 1114
07-24 65° 79° 5411 3872 2490 1596 1132
07-25 63° 78° 5459 3910 2518 1616 1147
07-26 55° 77° 5503 3944 2542 1632 1158
07-27 53° 80° 5548 3979 2567 1649 1170
07-28 57° 82° 5595 4016 2594 1668 1184
07-29 62° 84° 5646 4057 2625 1691 1202
07-30 70° 82° 5700 4101 2658 1717 1223
07-31 70° 85° 5755 4146 2694 1744 1245
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 64° 88° 5809 4190 2728 1770 1266
08-02 70° 85° 5865 4236 2763 1798 1289
08-03 68° 82° 5918 4279 2796 1823 1309
08-04 67° 83° 5970 4321 2829 1847 1328
08-05 63° 83° 6022 4363 2860 1871 1347
08-06 67° 84° 6075 4406 2894 1896 1367
08-07 62° 70° 6119 4440 2918 1912 1378
08-08 61° 68° 6162 4473 2941 1927 1388
08-09 68° 75° 6211 4512 2970 1948 1404
08-10 62° 78° 6259 4550 2998 1968 1419
08-11 54° 75° 6302 4583 3020 1983 1429
08-12 55° 74° 6344 4615 3043 1997 1438
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 53° 75° 6387 4648 3065 2011 1448
08-14 56° 79° 6432 4683 3091 2029 1460
08-15 56° 80° 6478 4719 3117 2047 1473
08-16 57° 82° 6526 4757 3144 2066 1488
08-17 66° 71° 6572 4793 3171 2085 1501
08-18 65° 73° 6619 4830 3198 2104 1515
08-19 59° 72° 6663 4864 3221 2119 1526
08-20 53° 64° 6699 4890 3238 2128 1529
08-21 46° 65° 6733 4914 3251 2133 1530
08-22 47° 70° 6769 4940 3268 2142 1533
08-23 49° 75° 6809 4970 3288 2154 1540
08-24 53° 78° 6852 5003 3311 2169 1550
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 57° 81° 6900 5041 3339 2189 1565
08-26 57° 82° 6947 5078 3366 2208 1579
08-27 56° 83° 6995 5116 3394 2228 1594
08-28 68° 88° 7051 5162 3430 2256 1617
08-29 66° 75° 7099 5200 3458 2276 1632
08-30 61° 66° 7141 5232 3479 2289 1641
08-31 62° 71° 7185 5266 3504 2306 1652
09-01 66° 80° 7236 5307 3535 2329 1670
09-02 54° 69° 7276 5337 3555 2341 1677
09-03 44° 68° 7310 5361 3569 2347 1678
09-04 45° 73° 7347 5388 3586 2356 1682
09-05 46° 74° 7385 5416 3603 2366 1687
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 53° 75° 7427 5448 3625 2380 1696
09-07 53° 66° 7464 5475 3642 2389 1700
09-08 44° 63° 7496 5497 3654 2392 1700
09-09 42° 68° 7529 5520 3667 2398 1700
09-10 50° 72° 7568 5549 3687 2409 1706
09-11 47° 77° 7608 5579 3707 2421 1713
09-12 53° 77° 7651 5612 3730 2436 1723
09-13 52° 79° 7695 5646 3753 2452 1734
09-14 53° 81° 7740 5681 3778 2469 1746
09-15 55° 78° 7785 5716 3803 2485 1758
09-16 48° 78° 7826 5747 3824 2498 1766
09-17 52° 75° 7867 5778 3846 2512 1774
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 60° 72° 7911 5812 3870 2528 1785
09-19 56° 81° 7957 5848 3896 2546 1798
09-20 54° 79° 8002 5883 3920 2563 1810
09-21 59° 75° 8047 5918 3945 2580 1822
09-22 57° 74° 8090 5951 3969 2595 1832
09-23 54° 60° 8125 5976 3984 2602 1834
09-24 54° 60° 8160 6001 3999 2609 1837
09-25 55° 60° 8196 6027 4015 2617 1839
09-26 60° 70° 8239 6060 4038 2632 1849
09-27 61° 67° 8281 6092 4060 2646 1858
09-28 60° 67° 8323 6124 4082 2660 1867
09-29 58° 62° 8361 6152 4100 2670 1872
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 59° 70° 8404 6185 4122 2684 1882

 

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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