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 Sun, Apr. 19. 2026

 

Forecasted GDD Total: 207 (Base 50) through Sun, Apr. 19, 2026

  

Hackettstown, NJ

        

Forecast »

“Flashback” to 2025

4/12

4/13

4/14

4/15

4/16

4/17

4/18

4/19

4/20

4/21

4/22

4/23

4/24

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 25° 40° 10 0 0 0 0
02-16 29° 37° 21 1 0 0 0
02-17 32° 48° 39 9 0 0 0
02-18 32° 42° 54 14 0 0 0
02-19 34° 38° 68 18 0 0 0
02-20 34° 36° 81 21 0 0 0
02-21 33° 44° 97 27 0 0 0
02-22 29° 35° 107 27 0 0 0
02-23 27° 34° 116 27 0 0 0
02-24 18° 28° 117 27 0 0 0
02-25 20° 42° 126 27 0 0 0
02-26 32° 46° 143 34 0 0 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 23° 50° 157 39 0 0 0
02-28 26° 57° 177 49 0 0 0
03-01 27° 41° 189 51 0 0 0
03-02 15° 33° 191 51 0 0 0
03-03 23° 35° 198 51 0 0 0
03-04 35° 47° 217 60 0 0 0
03-05 38° 43° 236 69 0 0 0
03-06 36° 40° 252 74 0 0 0
03-07 35° 49° 272 84 0 0 0
03-08 48° 66° 307 109 15 7 2
03-09 40° 70° 340 133 28 12 2
03-10 44° 78° 379 162 48 24 9
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 51° 75° 420 193 69 37 17
03-12 33° 64° 447 209 75 37 17
03-13 26° 42° 459 212 75 37 17
03-14 30° 49° 477 219 75 37 17
03-15 33° 43° 493 225 75 37 17
03-16 44° 64° 524 247 87 40 17
03-17 29° 52° 543 256 87 40 17
03-18 21° 35° 549 256 87 40 17
03-19 30° 44° 564 260 87 40 17
03-20 31° 62° 588 275 92 40 17
03-21 45° 54° 616 293 99 40 17
03-22 41° 68° 649 315 112 45 17
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 33° 53° 669 326 113 45 17
03-24 30° 46° 685 332 113 45 17
03-25 31° 54° 706 343 113 45 17
03-26 44° 73° 742 369 130 53 20
03-27 37° 60° 769 386 137 53 20
03-28 27° 41° 781 388 137 53 20
03-29 24° 54° 798 395 137 53 20
03-30 42° 69° 831 418 150 59 20
03-31 60° 77° 878 455 176 77 34
04-01 53° 74° 919 486 197 90 42
04-02 40° 50° 942 499 200 90 42
04-03 39° 62° 970 517 209 91 42
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 43° 71° 1005 542 223 98 44
04-05 40° 54° 1030 557 228 98 44
04-06 38° 52° 1053 570 232 98 44
04-07 31° 50° 1072 579 232 98 44
04-08 28° 50° 1089 586 232 98 44
04-09 29° 56° 1109 596 232 98 44
04-10 35° 68° 1139 616 242 99 44
04-11 46° 60° 1170 636 252 102 44
04-12 35° 61° 1196 652 258 102 44
04-13 45° 78° 1235 682 278 113 50
04-14 57° 83° 1283 720 306 133 65
04-15 59° 86° 1334 760 336 156 83
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 62° 88° 1387 803 369 181 103
04-17 62° 75° 1433 840 396 199 116
04-18 49° 68° 1469 866 412 207 119
04-19 46° 51° 1496 883 419 207 119
04-20 35° 48° 1516 892 419 207 119
04-21 27° 52° 1533 900 419 207 119
04-22 37° 63° 1561 918 427 208 119
04-23 39° 69° 1594 940 439 212 119
04-24 45° 71° 1630 967 455 220 123
04-25 47° 65° 1664 991 469 226 124
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 25° 33° 7 0 0 0 0
02-16 33° 40° 22 5 0 0 0
02-17 22° 32° 27 5 0 0 0
02-18 15° 24° 27 5 0 0 0
02-19 12° 28° 27 5 0 0 0
02-20 14° 24° 27 5 0 0 0
02-21 17° 31° 29 5 0 0 0
02-22 18° 39° 35 5 0 0 0
02-23 27° 44° 48 8 0 0 0
02-24 29° 51° 66 16 0 0 0
02-25 37° 55° 91 30 4 0 0
02-26 34° 53° 112 42 6 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 41° 51° 136 56 10 0 0
02-28 35° 47° 155 65 10 0 0
03-01 24° 58° 174 74 10 0 0
03-02 16° 31° 176 74 10 0 0
03-03 16° 38° 181 74 10 0 0
03-04 27° 52° 198 81 10 0 0
03-05 40° 58° 225 98 17 0 0
03-06 33° 54° 247 110 18 0 0
03-07 31° 48° 264 117 18 0 0
03-08 33° 42° 280 123 18 0 0
03-09 25° 52° 297 129 18 0 0
03-10 37° 64° 325 148 27 1 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 36° 67° 355 168 36 2 0
03-12 38° 54° 379 182 40 2 0
03-13 34° 50° 398 191 40 2 0
03-14 33° 57° 422 204 43 2 0
03-15 38° 49° 443 216 45 2 0
03-16 46° 68° 478 241 60 9 2
03-17 35° 60° 503 256 65 9 2
03-18 30° 61° 526 269 68 9 2
03-19 38° 66° 556 289 78 11 2
03-20 41° 59° 585 307 86 11 2
03-21 34° 49° 604 317 86 11 2
03-22 33° 57° 627 330 90 11 2
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 25° 46° 641 334 90 11 2
03-24 36° 46° 660 343 90 11 2
03-25 41° 55° 686 359 96 11 2
03-26 34° 48° 705 368 96 11 2
03-27 29° 50° 722 375 96 11 2
03-28 38° 59° 749 392 102 11 2
03-29 47° 77° 789 422 123 23 9
03-30 40° 47° 810 433 124 23 9
03-31 44° 75° 848 461 141 33 13
04-01 35° 58° 873 475 146 33 13
04-02 32° 46° 890 483 146 33 13
04-03 41° 70° 923 506 160 39 14
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 55° 69° 964 537 180 51 21
04-05 44° 55° 991 554 188 51 21
04-06 43° 53° 1017 570 194 51 21
04-07 37° 46° 1037 579 194 51 21
04-08 33° 41° 1051 584 194 51 21
04-09 29° 45° 1067 590 194 51 21
04-10 34° 49° 1086 599 194 51 21
04-11 38° 43° 1104 607 194 51 21
04-12 34° 40° 1119 612 194 51 21
04-13 37° 56° 1144 627 199 51 21
04-14 36° 63° 1172 645 207 51 21
04-15 46° 66° 1206 669 221 57 22
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 40° 47° 1228 681 222 57 22
04-17 37° 60° 1255 697 229 57 22
04-18 37° 71° 1286 719 241 61 22
04-19 58° 81° 1334 756 268 80 37
04-20 50° 70° 1371 784 286 90 42
04-21 42° 56° 1399 802 293 90 42
04-22 52° 75° 1440 833 315 103 50
04-23 50° 74° 1480 863 335 115 57
04-24 47° 78° 1521 894 356 128 65
04-25 52° 77° 1564 927 378 143 75
04-26 53° 74° 1605 958 400 156 83
04-27 46° 60° 1636 979 411 159 83
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 43° 73° 1672 1005 427 167 86
04-29 47° 79° 1713 1036 448 180 94
04-30 53° 70° 1753 1066 468 192 101
05-01 43° 72° 1789 1092 483 200 103
05-02 54° 81° 1834 1127 509 217 116
05-03 58° 82° 1882 1165 536 237 131
05-04 62° 69° 1925 1198 560 252 141
05-05 57° 63° 1963 1226 578 262 146
05-06 55° 69° 2003 1256 598 274 153
05-07 51° 71° 2043 1285 617 286 159
05-08 53° 74° 2084 1317 638 299 168
05-09 48° 57° 2115 1337 649 302 168
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 47° 69° 2151 1364 665 310 171
05-11 47° 74° 2189 1392 683 320 176
05-12 47° 76° 2228 1421 703 331 183
05-13 58° 65° 2268 1451 722 343 189
05-14 56° 59° 2304 1477 738 351 192
05-15 59° 68° 2346 1508 760 365 201
05-16 60° 75° 2391 1544 786 382 214
05-17 63° 80° 2441 1584 816 404 230
05-18 58° 68° 2482 1615 836 417 238
05-19 51° 66° 2518 1641 853 425 242
05-20 44° 65° 2551 1664 865 430 242
05-21 46° 54° 2579 1682 873 430 242
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 46° 50° 2605 1698 880 430 242
05-23 46° 62° 2637 1720 892 434 242
05-24 45° 62° 2669 1742 903 438 242
05-25 49° 65° 2704 1766 918 444 243
05-26 46° 70° 2740 1793 934 453 246
05-27 49° 71° 2778 1821 952 463 251
05-28 51° 60° 2812 1844 966 468 252
05-29 52° 69° 2850 1873 985 479 258
05-30 59° 77° 2896 1909 1010 497 271
05-31 51° 64° 2931 1934 1026 504 273
06-01 47° 63° 2964 1957 1039 509 273
06-02 45° 69° 2999 1982 1054 516 275
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 49° 76° 3040 2012 1074 528 282
06-04 54° 83° 3086 2049 1100 547 296
06-05 64° 85° 3138 2091 1133 571 315
06-06 65° 85° 3191 2134 1166 596 335
06-07 66° 77° 3241 2174 1195 617 351
06-08 61° 72° 3285 2208 1220 634 363
06-09 59° 64° 3325 2237 1239 645 369
06-10 61° 76° 3371 2274 1265 664 383
06-11 57° 78° 3417 2310 1291 682 395
06-12 62° 84° 3468 2351 1322 705 414
06-13 63° 75° 3515 2388 1349 724 427
06-14 60° 66° 3555 2418 1370 736 435
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 57° 60° 3592 2445 1386 745 439
06-16 58° 62° 3630 2473 1405 755 444
06-17 60° 68° 3672 2505 1427 769 453
06-18 66° 82° 3724 2547 1459 793 472
06-19 68° 85° 3779 2592 1493 820 494
06-20 63° 79° 3828 2631 1522 841 510
06-21 65° 85° 3881 2674 1556 866 530
06-22 70° 86° 3938 2721 1592 895 554
06-23 74° 93° 4000 2773 1634 929 583
06-24 74° 95° 4062 2825 1677 963 612
06-25 73° 92° 4123 2876 1718 996 640
06-26 64° 77° 4172 2915 1746 1016 655
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 61° 66° 4214 2946 1768 1030 664
06-28 60° 81° 4262 2985 1796 1050 679
06-29 70° 86° 4318 3031 1832 1079 702
06-30 65° 88° 4372 3075 1866 1105 724
07-01 70° 85° 4428 3121 1902 1133 746
07-02 69° 84° 4482 3165 1937 1159 768
07-03 63° 85° 4534 3207 1968 1183 786
07-04 60° 79° 4581 3244 1996 1202 801
07-05 58° 83° 4630 3283 2024 1222 816
07-06 66° 85° 4683 3326 2058 1248 837
07-07 72° 85° 4740 3373 2095 1277 861
07-08 71° 89° 4798 3421 2133 1307 886
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 71° 87° 4855 3468 2170 1336 910
07-10 66° 81° 4907 3510 2201 1359 928
07-11 69° 84° 4961 3554 2235 1386 950
07-12 72° 85° 5018 3600 2272 1414 973
07-13 71° 83° 5073 3646 2307 1442 995
07-14 70° 86° 5129 3692 2343 1470 1019
07-15 69° 87° 5185 3738 2379 1498 1042
07-16 71° 89° 5243 3785 2417 1527 1066
07-17 73° 88° 5301 3834 2455 1558 1092
07-18 67° 80° 5353 3876 2487 1582 1110
07-19 64° 77° 5401 3914 2516 1602 1126
07-20 72° 86° 5458 3961 2553 1631 1150
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 65° 83° 5510 4003 2585 1655 1169
07-22 60° 77° 5557 4040 2611 1673 1182
07-23 60° 81° 5605 4078 2640 1694 1198
07-24 64° 85° 5658 4121 2673 1719 1218
07-25 71° 93° 5719 4172 2713 1752 1245
07-26 70° 83° 5773 4216 2748 1778 1267
07-27 67° 86° 5828 4261 2782 1805 1289
07-28 70° 92° 5887 4310 2821 1836 1315
07-29 70° 95° 5948 4361 2862 1868 1342
07-30 71° 92° 6008 4410 2902 1900 1369
07-31 64° 83° 6059 4452 2934 1924 1388
08-01 61° 73° 6104 4487 2958 1941 1400
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 57° 78° 6149 4522 2984 1958 1412
08-03 56° 82° 6196 4559 3011 1977 1426
08-04 58° 86° 6246 4599 3041 1999 1443
08-05 62° 84° 6297 4640 3071 2022 1461
08-06 65° 76° 6345 4678 3100 2042 1476
08-07 61° 78° 6393 4716 3127 2062 1491
08-08 56° 80° 6439 4752 3154 2080 1504
08-09 55° 84° 6487 4790 3181 2100 1519
08-10 58° 87° 6537 4830 3212 2122 1536
08-11 62° 87° 6590 4873 3244 2147 1555
08-12 63° 91° 6645 4917 3279 2173 1577
08-13 70° 88° 6701 4964 3316 2202 1601
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 70° 88° 6758 5011 3353 2231 1625
08-15 71° 88° 6816 5059 3390 2261 1650
08-16 71° 86° 6873 5106 3427 2289 1673
08-17 70° 89° 6930 5153 3464 2319 1698
08-18 62° 74° 6976 5189 3490 2337 1711
08-19 60° 74° 7021 5224 3516 2354 1723
08-20 58° 66° 7061 5254 3536 2366 1730
08-21 57° 71° 7104 5287 3558 2380 1739
08-22 55° 80° 7149 5322 3584 2398 1752
08-23 57° 81° 7197 5360 3611 2418 1766
08-24 59° 79° 7244 5397 3639 2437 1781
08-25 65° 81° 7295 5438 3669 2460 1799
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 54° 75° 7337 5470 3692 2474 1808
08-27 51° 72° 7377 5500 3711 2486 1815
08-28 49° 75° 7417 5530 3732 2498 1822
08-29 56° 74° 7460 5563 3755 2513 1832
08-30 48° 73° 7499 5592 3773 2524 1838
08-31 50° 77° 7540 5623 3795 2537 1846
09-01 54° 76° 7583 5656 3818 2552 1856
09-02 53° 76° 7626 5689 3840 2566 1865
09-03 53° 78° 7669 5722 3863 2582 1876
09-04 56° 80° 7715 5758 3889 2600 1889
09-05 63° 81° 7765 5798 3919 2622 1906
09-06 65° 80° 7815 5838 3950 2644 1923
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 58° 72° 7859 5872 3973 2660 1933
09-08 48° 71° 7897 5900 3991 2670 1938
09-09 50° 71° 7935 5928 4010 2680 1944
09-10 57° 72° 7978 5961 4032 2695 1954
09-11 54° 77° 8022 5995 4056 2710 1964
09-12 56° 76° 8066 6028 4080 2726 1975
09-13 56° 79° 8111 6064 4106 2744 1988
09-14 58° 81° 8159 6102 4133 2763 2002
09-15 59° 78° 8205 6138 4160 2782 2016
09-16 59° 73° 8249 6172 4184 2798 2027
09-17 60° 69° 8292 6205 4206 2813 2037
09-18 60° 83° 8341 6244 4236 2834 2053
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 59° 80° 8389 6282 4263 2854 2067
09-20 54° 74° 8431 6314 4285 2867 2076
09-21 52° 70° 8470 6343 4304 2879 2083
09-22 50° 69° 8508 6371 4322 2889 2087
09-23 58° 81° 8555 6408 4350 2908 2102
09-24 63° 76° 8603 6446 4377 2928 2117
09-25 68° 77° 8653 6486 4408 2950 2134
09-26 64° 79° 8703 6526 4437 2972 2151
09-27 58° 78° 8749 6562 4463 2990 2164
09-28 61° 84° 8799 6602 4494 3012 2181
09-29 60° 75° 8845 6638 4519 3030 2194
09-30 58° 79° 8891 6674 4546 3048 2207
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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