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 Fri, Aug. 14. 2026

 

GDD Total: 1627 (Base 50) through Fri, Aug. 14, 2026

  

Hornell, NY

        

Forecast »

“Flashback” to 2025

8/10

8/11

8/12

8/13

8/14

8/16

8/17

8/18

8/19

8/20

8/21

8/22

Done

2701

Over

2151

Adult Emergence

950

Close

751

Under

0

 

Generously Supported By:



Tabular Data

Daily GDD accumulation for various base temperature models in 2025 & 2026

2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 21° 40° 8 0 0 0 0
02-16 33° 43° 25 6 0 0 0
02-17 35° 45° 43 15 0 0 0
02-18 33° 36° 55 17 0 0 0
02-19 31° 44° 71 23 0 0 0
02-20 31° 42° 85 27 0 0 0
02-21 28° 31° 93 27 0 0 0
02-22 25° 32° 99 27 0 0 0
02-23 14° 26° 99 27 0 0 0
02-24 9° 22° 99 27 0 0 0
02-25 22° 36° 107 27 0 0 0
02-26 18° 29° 108 27 0 0 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 19° 44° 117 27 0 0 0
02-28 26° 49° 133 33 0 0 0
03-01 9° 24° 133 33 0 0 0
03-02 4° 30° 133 33 0 0 0
03-03 22° 35° 139 33 0 0 0
03-04 33° 52° 159 43 0 0 0
03-05 35° 43° 176 50 0 0 0
03-06 31° 56° 198 62 2 0 0
03-07 46° 64° 232 86 16 6 1
03-08 42° 57° 259 103 23 6 1
03-09 41° 66° 291 124 34 9 1
03-10 51° 70° 329 153 53 19 6
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 49° 66° 365 179 69 27 9
03-12 26° 52° 382 186 69 27 9
03-13 21° 38° 389 186 69 27 9
03-14 24° 31° 395 186 69 27 9
03-15 26° 51° 411 192 69 27 9
03-16 26° 62° 433 204 71 27 9
03-17 13° 24° 433 204 71 27 9
03-18 9° 30° 433 204 71 27 9
03-19 28° 43° 447 207 71 27 9
03-20 29° 48° 463 214 71 27 9
03-21 29° 39° 475 216 71 27 9
03-22 30° 53° 495 226 71 27 9
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 26° 31° 501 226 71 27 9
03-24 20° 42° 510 226 71 27 9
03-25 27° 54° 528 234 71 27 9
03-26 44° 66° 561 257 83 32 9
03-27 21° 45° 572 258 83 32 9
03-28 16° 30° 573 258 83 32 9
03-29 24° 53° 589 264 83 32 9
03-30 41° 63° 619 284 93 34 9
03-31 54° 66° 657 312 111 44 14
04-01 34° 57° 681 326 115 44 14
04-02 33° 52° 702 336 116 44 14
04-03 49° 69° 739 363 133 53 18
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 37° 71° 771 385 145 57 18
04-05 31° 66° 797 402 151 57 18
04-06 30° 39° 810 405 151 57 18
04-07 20° 32° 814 405 151 57 18
04-08 17° 51° 826 407 151 57 18
04-09 37° 66° 856 426 161 59 18
04-10 43° 67° 889 450 174 64 18
04-11 34° 48° 908 458 174 64 18
04-12 31° 64° 933 474 180 64 18
04-13 57° 70° 975 506 201 78 27
04-14 55° 75° 1018 539 224 93 37
04-15 55° 77° 1062 573 249 109 48
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 57° 78° 1108 609 274 127 61
04-17 53° 66° 1145 636 291 136 65
04-18 51° 74° 1186 667 312 149 73
04-19 32° 52° 1206 677 312 149 73
04-20 25° 33° 1213 677 312 149 73
04-21 21° 53° 1228 682 312 149 73
04-22 44° 67° 1261 705 326 154 73
04-23 42° 66° 1294 727 338 158 73
04-24 41° 56° 1320 744 344 158 73
04-25 41° 45° 1341 755 345 158 73
04-26 38° 56° 1367 770 351 158 73
04-27 38° 68° 1398 792 362 161 73
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 48° 57° 1428 812 373 164 73
04-29 42° 53° 1454 828 379 164 73
04-30 38° 44° 1474 837 379 164 73
05-01 34° 44° 1491 844 379 164 73
05-02 30° 41° 1504 848 379 164 73
05-03 31° 52° 1524 858 379 164 73
05-04 43° 70° 1559 882 393 170 75
05-05 50° 66° 1595 909 409 179 78
05-06 40° 50° 1618 922 412 179 78
05-07 33° 50° 1637 931 412 179 78
05-08 35° 54° 1659 943 415 179 78
05-09 44° 60° 1689 963 424 180 78
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 41° 57° 1716 980 432 180 78
05-11 33° 51° 1737 991 432 180 78
05-12 31° 59° 1760 1004 435 180 78
05-13 43° 61° 1791 1024 446 183 78
05-14 40° 43° 1810 1034 446 183 78
05-15 41° 61° 1839 1053 455 184 78
05-16 44° 76° 1877 1081 473 194 83
05-17 59° 81° 1925 1119 501 214 98
05-18 63° 87° 1978 1162 534 239 118
05-19 65° 82° 2029 1203 565 262 136
05-20 49° 71° 2068 1231 583 272 141
05-21 42° 59° 2096 1250 592 273 141
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 38° 61° 2123 1267 599 273 141
05-23 43° 57° 2151 1285 607 273 141
05-24 45° 59° 2181 1305 617 275 141
05-25 53° 71° 2221 1335 637 287 148
05-26 48° 79° 2262 1366 658 300 157
05-27 58° 78° 2309 1403 685 319 170
05-28 48° 60° 2341 1425 696 323 170
05-29 43° 71° 2376 1450 712 330 173
05-30 43° 59° 2405 1469 720 331 173
05-31 41° 67° 2437 1491 732 335 173
06-01 44° 65° 2469 1513 745 339 173
06-02 42° 69° 2503 1537 759 345 173
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 46° 75° 2541 1565 777 355 179
06-04 50° 77° 2583 1597 799 369 188
06-05 55° 81° 2629 1633 825 387 200
06-06 63° 75° 2676 1670 852 406 214
06-07 58° 70° 2718 1702 874 420 223
06-08 50° 78° 2760 1733 895 433 232
06-09 59° 82° 2808 1772 924 454 247
06-10 67° 79° 2859 1813 955 477 266
06-11 67° 85° 2913 1857 989 503 286
06-12 62° 77° 2961 1895 1017 523 301
06-13 56° 77° 3005 1929 1041 539 313
06-14 56° 71° 3047 1961 1063 553 321
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 48° 57° 3077 1981 1073 555 321
06-16 46° 70° 3113 2007 1089 563 324
06-17 53° 72° 3154 2037 1109 575 332
06-18 59° 71° 3197 2070 1132 590 341
06-19 57° 68° 3237 2101 1152 603 349
06-20 54° 68° 3275 2129 1171 613 354
06-21 53° 71° 3315 2159 1191 625 361
06-22 56° 59° 3351 2184 1206 632 364
06-23 54° 70° 3391 2214 1226 644 370
06-24 51° 71° 3429 2243 1245 655 376
06-25 58° 63° 3468 2272 1263 666 382
06-26 58° 73° 3511 2305 1287 681 392
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 58° 74° 3556 2339 1311 697 403
06-28 56° 79° 3601 2375 1336 715 416
06-29 60° 82° 3650 2414 1365 736 432
06-30 68° 87° 3705 2459 1401 763 454
07-01 72° 90° 3764 2508 1439 794 480
07-02 72° 90° 3823 2557 1479 825 506
07-03 72° 87° 3880 2604 1516 854 530
07-04 69° 82° 3934 2648 1549 880 551
07-05 66° 76° 3983 2687 1579 901 567
07-06 63° 73° 4029 2723 1605 919 580
07-07 63° 73° 4075 2759 1631 937 593
07-08 60° 80° 4123 2797 1659 957 608
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 63° 82° 4174 2837 1689 979 626
07-10 63° 77° 4222 2876 1718 1000 641
07-11 59° 77° 4268 2912 1744 1018 654
07-12 55° 78° 4312 2946 1768 1034 665
07-13 61° 82° 4362 2986 1798 1056 682
07-14 63° 88° 4416 3029 1831 1081 702
07-15 68° 82° 4469 3073 1864 1107 723
07-16 64° 78° 4518 3111 1893 1127 738
07-17 57° 78° 4563 3147 1919 1145 751
07-18 63° 78° 4612 3186 1948 1166 767
07-19 56° 71° 4654 3217 1969 1179 775
07-20 49° 76° 4694 3248 1990 1192 783
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 63° 73° 4740 3284 2016 1210 796
07-22 55° 64° 4778 3311 2033 1219 801
07-23 45° 72° 4814 3338 2050 1228 804
07-24 50° 77° 4856 3369 2071 1241 812
07-25 56° 76° 4900 3403 2095 1257 824
07-26 61° 77° 4947 3440 2122 1276 837
07-27 60° 79° 4994 3478 2150 1296 852
07-28 63° 71° 5040 3513 2175 1313 865
07-29 60° 66° 5081 3544 2196 1326 873
07-30 60° 68° 5123 3576 2218 1340 882
07-31 56° 79° 5168 3612 2244 1358 894
08-01 59° 77° 5215 3649 2270 1377 908
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 67° 73° 5262 3686 2298 1396 922
08-03 59° 73° 5307 3720 2322 1412 933
08-04 53° 79° 5351 3754 2346 1428 944
08-05 59° 83° 5400 3793 2375 1449 961
08-06 68° 82° 5453 3836 2408 1474 980
08-07 64° 75° 5500 3874 2436 1494 995
08-08 64° 79° 5550 3914 2466 1516 1012
08-09 64° 78° 5599 3953 2495 1537 1028
08-10 62° 74° 5645 3989 2521 1555 1041
08-11 62° 74° 5691 4025 2547 1573 1054
08-12 57° 77° 5736 4060 2572 1590 1066
08-13 63° 76° 5784 4098 2600 1610 1081
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 58° 77° 5830 4133 2625 1627 1093
08-15 55° 76° 0 0 0 0 0
08-16 58° 73° 44 34 24 16 11
08-17 67° 78° 94 74 54 38 28
08-18 57° 78° 139 109 79 55 40
08-19 59° 76° 185 145 105 73 53
08-20 55° 74° 227 177 127 87 62
08-21 52° 76° 269 209 149 101 71
08-22 55° 77° 313 243 173 117 82
08-23 57° 75° 357 277 197 133 93
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 18° 29° 2 0 0 0 0
02-16 17° 33° 5 0 0 0 0
02-17 9° 17° 5 0 0 0 0
02-18 3° 13° 5 0 0 0 0
02-19 6° 15° 5 0 0 0 0
02-20 11° 16° 5 0 0 0 0
02-21 11° 18° 5 0 0 0 0
02-22 17° 31° 7 0 0 0 0
02-23 22° 32° 12 0 0 0 0
02-24 25° 43° 25 2 0 0 0
02-25 34° 42° 41 8 0 0 0
02-26 31° 40° 55 12 0 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 33° 41° 70 18 0 0 0
02-28 25° 41° 81 19 0 0 0
03-01 11° 41° 85 19 0 0 0
03-02 8° 18° 85 19 0 0 0
03-03 16° 33° 87 19 0 0 0
03-04 31° 55° 108 30 1 0 0
03-05 43° 53° 134 46 7 0 0
03-06 24° 44° 146 48 7 0 0
03-07 22° 35° 153 48 7 0 0
03-08 20° 28° 155 48 7 0 0
03-09 20° 41° 164 48 7 0 0
03-10 36° 59° 189 63 12 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 36° 64° 217 81 20 0 0
03-12 22° 41° 226 81 20 0 0
03-13 29° 60° 249 93 22 0 0
03-14 34° 68° 277 112 31 1 0
03-15 44° 53° 304 128 38 1 0
03-16 47° 62° 336 151 50 5 0
03-17 27° 45° 350 155 50 5 0
03-18 23° 62° 371 166 51 5 0
03-19 44° 70° 406 190 66 12 2
03-20 33° 58° 429 204 69 12 2
03-21 26° 43° 442 206 69 12 2
03-22 21° 48° 454 209 69 12 2
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 16° 39° 460 209 69 12 2
03-24 35° 53° 482 220 71 12 2
03-25 26° 38° 492 220 71 12 2
03-26 24° 32° 498 220 71 12 2
03-27 20° 47° 509 222 71 12 2
03-28 34° 52° 530 233 71 12 2
03-29 47° 58° 561 253 82 15 2
03-30 48° 70° 598 280 99 24 6
03-31 33° 61° 623 295 104 24 6
04-01 28° 39° 634 297 104 24 6
04-02 27° 45° 648 301 104 24 6
04-03 46° 70° 684 327 120 32 9
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 41° 56° 711 343 126 32 9
04-05 44° 57° 739 362 135 33 9
04-06 33° 47° 757 370 135 33 9
04-07 30° 46° 774 376 135 33 9
04-08 20° 30° 776 376 135 33 9
04-09 17° 39° 782 376 135 33 9
04-10 28° 37° 793 377 135 33 9
04-11 36° 40° 809 383 135 33 9
04-12 34° 39° 824 387 135 33 9
04-13 37° 54° 847 401 139 33 9
04-14 36° 67° 877 421 149 34 9
04-15 34° 56° 900 434 151 34 9
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 30° 34° 910 434 151 34 9
04-17 30° 53° 929 443 151 34 9
04-18 37° 74° 962 467 165 40 9
04-19 50° 71° 1001 495 184 51 15
04-20 36° 53° 1024 508 186 51 15
04-21 40° 66° 1055 529 197 54 15
04-22 45° 61° 1086 550 208 57 15
04-23 38° 69° 1117 571 220 60 15
04-24 51° 78° 1160 604 242 74 24
04-25 56° 68° 1200 634 262 87 32
04-26 38° 59° 1226 650 269 87 32
04-27 38° 58° 1252 666 275 87 32
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 35° 71° 1283 687 286 90 32
04-29 55° 82° 1330 724 312 108 45
04-30 37° 60° 1356 740 319 108 45
05-01 44° 75° 1394 768 337 118 50
05-02 57° 70° 1435 800 358 131 58
05-03 45° 56° 1464 818 367 132 58
05-04 45° 52° 1491 835 373 132 58
05-05 52° 64° 1527 861 389 140 61
05-06 51° 64° 1562 886 405 148 64
05-07 49° 68° 1599 913 421 156 67
05-08 41° 56° 1625 929 427 156 67
05-09 37° 49° 1645 939 428 156 67
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 39° 68° 1677 961 439 160 67
05-11 42° 63° 1707 981 450 162 67
05-12 45° 80° 1748 1012 470 174 75
05-13 57° 68° 1788 1042 491 187 82
05-14 57° 60° 1825 1069 508 196 86
05-15 57° 71° 1867 1101 530 210 95
05-16 59° 80° 1915 1139 557 230 110
05-17 53° 72° 1955 1169 578 242 117
05-18 50° 56° 1986 1190 589 245 117
05-19 43° 56° 2014 1208 596 245 117
05-20 37° 59° 2040 1224 602 245 117
05-21 41° 50° 2063 1237 606 245 117
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 45° 53° 2090 1254 613 245 117
05-23 42° 51° 2115 1269 617 245 117
05-24 43° 49° 2139 1283 621 245 117
05-25 43° 56° 2166 1300 629 245 117
05-26 41° 66° 2198 1322 640 248 117
05-27 45° 68° 2232 1346 654 254 118
05-28 48° 53° 2261 1365 663 255 118
05-29 52° 67° 2298 1392 681 265 123
05-30 51° 69° 2336 1420 699 275 128
05-31 43° 53° 2362 1436 705 275 128
06-01 41° 56° 2389 1453 711 275 128
06-02 39° 68° 2420 1474 723 278 128
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 49° 79° 2462 1506 744 291 136
06-04 58° 85° 2511 1545 774 313 153
06-05 62° 81° 2561 1585 803 335 169
06-06 61° 70° 2604 1618 827 350 180
06-07 59° 72° 2648 1652 851 366 191
06-08 52° 71° 2688 1682 870 378 198
06-09 59° 73° 2732 1716 894 393 208
06-10 57° 68° 2772 1746 914 406 216
06-11 54° 76° 2815 1779 937 421 226
06-12 60° 73° 2859 1813 962 437 237
06-13 54° 69° 2899 1843 981 449 243
06-14 53° 63° 2935 1869 997 457 246
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 58° 68° 2976 1900 1018 470 255
06-16 60° 69° 3018 1932 1041 484 264
06-17 61° 73° 3063 1967 1066 501 276
06-18 66° 78° 3113 2007 1095 523 293
06-19 59° 76° 3159 2043 1121 540 305
06-20 58° 73° 3202 2076 1145 556 316
06-21 61° 81° 3251 2115 1174 577 332
06-22 73° 88° 3310 2164 1212 608 358
06-23 72° 89° 3369 2213 1251 638 383
06-24 72° 90° 3427 2261 1290 669 409
06-25 69° 81° 3480 2304 1323 694 429
06-26 66° 79° 3530 2344 1353 716 446
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 65° 74° 3578 2382 1381 736 461
06-28 64° 82° 3629 2423 1411 759 479
06-29 57° 80° 3675 2459 1438 777 492
06-30 62° 82° 3725 2499 1468 799 509
07-01 69° 79° 3777 2541 1500 823 528
07-02 60° 80° 3825 2579 1527 843 543
07-03 61° 76° 3871 2615 1554 861 556
07-04 51° 74° 3912 2646 1575 874 564
07-05 56° 86° 3961 2685 1604 895 580
07-06 70° 87° 4018 2732 1640 924 603
07-07 69° 86° 4073 2777 1676 951 626
07-08 65° 72° 4120 2814 1703 970 640
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 62° 77° 4168 2852 1730 990 654
07-10 62° 79° 4216 2890 1759 1010 670
07-11 64° 83° 4268 2932 1791 1034 689
07-12 65° 87° 4322 2977 1825 1060 710
07-13 69° 85° 4377 3021 1860 1087 732
07-14 66° 80° 4428 3062 1891 1110 750
07-15 61° 85° 4479 3103 1922 1133 768
07-16 67° 85° 4533 3147 1956 1159 789
07-17 67° 78° 4583 3188 1986 1181 806
07-18 56° 72° 4626 3220 2009 1196 816
07-19 55° 81° 4672 3256 2035 1214 829
07-20 65° 78° 4722 3296 2064 1236 845
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 55° 69° 4761 3326 2084 1247 852
07-22 48° 73° 4800 3354 2103 1258 858
07-23 54° 82° 4846 3390 2129 1276 871
07-24 67° 88° 4902 3436 2165 1304 894
07-25 69° 80° 4955 3479 2197 1329 913
07-26 64° 81° 5005 3519 2228 1351 931
07-27 70° 83° 5060 3564 2262 1378 953
07-28 66° 88° 5115 3609 2297 1405 974
07-29 67° 87° 5170 3654 2332 1432 996
07-30 64° 86° 5222 3696 2365 1456 1016
07-31 55° 69° 5262 3727 2385 1468 1023
08-01 50° 68° 5300 3754 2402 1478 1027
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 47° 71° 5337 3781 2420 1487 1032
08-03 51° 76° 5379 3813 2441 1500 1040
08-04 54° 79° 5423 3847 2466 1517 1052
08-05 59° 81° 5471 3885 2494 1537 1067
08-06 62° 75° 5518 3922 2520 1555 1080
08-07 62° 78° 5565 3959 2548 1575 1095
08-08 60° 79° 5613 3997 2575 1595 1110
08-09 60° 84° 5663 4037 2605 1617 1126
08-10 62° 86° 5715 4079 2637 1641 1146
08-11 61° 87° 5767 4121 2669 1665 1165
08-12 67° 89° 5823 4167 2706 1693 1188
08-13 68° 80° 5875 4209 2738 1717 1207
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 64° 81° 5926 4250 2768 1740 1225
08-15 58° 83° 5974 4288 2797 1760 1240
08-16 61° 84° 6025 4329 2827 1782 1257
08-17 61° 77° 6072 4366 2854 1801 1271
08-18 52° 72° 6112 4396 2874 1814 1279
08-19 52° 73° 6152 4427 2895 1826 1286
08-20 61° 70° 6196 4460 2919 1842 1297
08-21 57° 64° 6234 4489 2937 1852 1302
08-22 52° 76° 6276 4520 2959 1866 1311
08-23 59° 78° 6323 4557 2986 1885 1325
08-24 60° 78° 6370 4594 3013 1904 1339
08-25 54° 66° 6408 4622 3031 1914 1344
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 51° 64° 6443 4648 3046 1921 1346
08-27 49° 66° 6479 4673 3061 1929 1349
08-28 47° 70° 6515 4700 3078 1937 1352
08-29 46° 58° 6546 4720 3088 1940 1352
08-30 41° 64° 6576 4740 3099 1942 1352
08-31 44° 70° 6611 4765 3114 1949 1354
09-01 48° 73° 6650 4794 3132 1959 1359
09-02 51° 73° 6690 4824 3153 1972 1367
09-03 54° 76° 6733 4857 3176 1987 1377
09-04 53° 69° 6772 4886 3195 1998 1383
09-05 48° 73° 6811 4915 3213 2009 1389
09-06 52° 62° 6846 4940 3228 2016 1391
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 46° 61° 6877 4961 3240 2019 1391
09-08 43° 64° 6909 4983 3251 2022 1391
09-09 44° 70° 6943 5008 3266 2029 1393
09-10 46° 73° 6981 5035 3284 2039 1397
09-11 47° 73° 7019 5063 3302 2049 1402
09-12 48° 74° 7058 5092 3321 2060 1408
09-13 52° 71° 7098 5122 3340 2072 1415
09-14 53° 75° 7140 5154 3362 2086 1424
09-15 48° 76° 7179 5183 3382 2097 1430
09-16 51° 78° 7222 5216 3404 2111 1440
09-17 53° 75° 7264 5248 3426 2126 1449
09-18 50° 79° 7306 5281 3449 2140 1459
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 50° 70° 7345 5309 3467 2150 1464
09-20 42° 72° 7379 5333 3482 2157 1465
09-21 50° 75° 7420 5364 3502 2170 1473
09-22 61° 76° 7466 5401 3529 2188 1487
09-23 60° 70° 7509 5433 3552 2203 1496
09-24 58° 75° 7553 5468 3576 2219 1508
09-25 60° 68° 7596 5500 3598 2234 1517
09-26 56° 72° 7638 5532 3620 2248 1526
09-27 52° 75° 7679 5563 3642 2261 1534
09-28 54° 78° 7723 5597 3666 2277 1545
09-29 48° 74° 7762 5626 3684 2288 1551
09-30 49° 74° 7801 5655 3704 2299 1557
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55

 

Latest Updates

February 16th, 2026Welcome to the 2026 GDD Tracking Season

Although Punxsutawney Phil saw his shadow predicting six more weeks of winter, GDDTracker will start 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. As spring turns to summer, 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 2026!


 

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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