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Japanese Beetle Adults Emerge, Breed and Feed (GDD 50)
forecast for Mon, Apr. 6. 2026

 

Forecasted GDD Total: 239 (Base 50) through Mon, Apr. 6, 2026

  

Arcadia, IL

        

Forecast »

“Flashback” to 2025

3/28

3/29

3/30

3/31

4/1

4/2

4/3

4/4

4/5

4/6

4/7

4/8

4/9

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 40° 54° 25 15 5 0 0
02-16 37° 64° 54 34 14 0 0
02-17 45° 57° 82 52 22 1 0
02-18 49° 68° 119 79 39 9 3
02-19 41° 65° 149 99 49 12 3
02-20 25° 47° 164 104 49 12 3
02-21 23° 39° 173 104 49 12 3
02-22 15° 28° 173 104 49 12 3
02-23 13° 31° 173 104 49 12 3
02-24 20° 50° 186 107 49 12 3
02-25 33° 49° 205 116 49 12 3
02-26 32° 58° 228 129 52 12 3
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 32° 74° 259 150 63 15 3
02-28 32° 59° 282 163 67 15 3
03-01 22° 41° 292 163 67 15 3
03-02 32° 38° 305 166 67 15 3
03-03 36° 45° 324 175 67 15 3
03-04 40° 46° 345 186 68 15 3
03-05 43° 54° 371 202 74 15 3
03-06 51° 78° 413 235 96 30 12
03-07 40° 65° 444 255 107 32 12
03-08 34° 67° 472 274 115 33 12
03-09 49° 80° 515 306 138 47 22
03-10 60° 85° 566 347 169 70 40
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 35° 72° 597 369 181 74 40
03-12 31° 49° 615 376 181 74 40
03-13 41° 53° 640 392 186 74 40
03-14 34° 58° 664 406 190 74 40
03-15 33° 70° 694 425 199 75 40
03-16 17° 32° 696 425 199 75 40
03-17 11° 29° 696 425 199 75 40
03-18 26° 62° 718 437 201 75 40
03-19 37° 77° 754 462 216 82 42
03-20 47° 84° 797 496 240 98 53
03-21 49° 84° 842 531 265 115 65
03-22 45° 80° 883 561 285 127 72
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 32° 49° 901 570 285 127 72
03-24 32° 63° 926 585 291 127 72
03-25 45° 76° 965 614 309 138 78
03-26 51° 91° 1014 653 338 159 94
03-27 35° 51° 1035 663 339 159 94
03-28 28° 52° 1053 671 339 159 94
03-29 41° 67° 1085 693 351 163 94
03-30 58° 84° 1134 732 380 184 110
03-31 64° 79° 1183 772 410 206 127
04-01 42° 59° 1212 791 418 206 127
04-02 46° 75° 1251 819 437 217 132
04-03 54° 81° 1296 855 463 234 145
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 52° 56° 1328 877 475 239 145
04-05 36° 55° 1352 890 478 239 145
04-06 38° 57° 1377 906 484 239 145
04-07 31° 51° 1396 915 484 239 145
04-08 39° 71° 1429 938 497 243 145
04-09 51° 72° 1469 967 516 255 151
04-10 53° 72° 1509 998 537 268 159
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 28° 37° 10 0 0 0 0
02-16 14° 27° 10 0 0 0 0
02-17 8° 17° 10 0 0 0 0
02-18 1° 12° 10 0 0 0 0
02-19 3° 14° 10 0 0 0 0
02-20 -1° 22° 10 0 0 0 0
02-21 4° 28° 10 0 0 0 0
02-22 12° 39° 14 0 0 0 0
02-23 26° 57° 33 10 0 0 0
02-24 38° 60° 60 26 7 0 0
02-25 37° 59° 86 42 13 0 0
02-26 42° 63° 116 63 23 2 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 36° 56° 140 77 27 2 0
02-28 36° 69° 171 97 37 4 0
03-01 23° 42° 181 97 37 4 0
03-02 16° 44° 189 97 37 4 0
03-03 33° 60° 214 112 42 4 0
03-04 47° 55° 243 131 51 6 0
03-05 30° 50° 261 139 51 6 0
03-06 25° 44° 273 141 51 6 0
03-07 36° 58° 298 156 56 6 0
03-08 30° 52° 317 165 56 6 0
03-09 32° 62° 342 180 61 6 0
03-10 40° 72° 376 204 75 11 1
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 48° 72° 414 232 93 22 6
03-12 33° 71° 444 252 103 24 6
03-13 42° 78° 482 280 122 34 11
03-14 57° 82° 530 318 149 54 26
03-15 43° 62° 561 339 160 56 26
03-16 30° 44° 576 344 160 56 26
03-17 25° 63° 598 356 162 56 26
03-18 49° 79° 640 388 184 71 35
03-19 44° 70° 675 413 199 78 37
03-20 32° 46° 692 420 199 78 37
03-21 31° 64° 717 435 205 78 37
03-22 33° 57° 740 448 208 78 37
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 43° 59° 769 467 217 78 37
03-24 36° 54° 792 480 220 78 37
03-25 42° 56° 819 497 226 78 37
03-26 35° 59° 844 512 232 78 37
03-27 47° 52° 872 530 239 78 37
03-28 50° 80° 915 563 263 94 48
03-29 63° 68° 959 597 286 109 58
03-30 47° 70° 995 623 302 117 61
03-31 37° 53° 1018 636 306 117 61
04-01 35° 54° 1041 649 308 117 61
04-02 52° 73° 1081 679 328 130 69
04-03 47° 60° 1113 701 340 133 69
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 41° 48° 1135 713 343 133 69
04-05 42° 46° 1158 726 345 133 69
04-06 37° 50° 1179 737 346 133 69
04-07 34° 55° 1201 749 349 133 69
04-08 23° 50° 1216 754 349 133 69
04-09 40° 63° 1245 773 358 135 69
04-10 38° 65° 1275 793 368 136 69
04-11 41° 53° 1300 808 373 136 69
04-12 34° 62° 1326 824 379 136 69
04-13 50° 80° 1369 857 402 151 79
04-14 54° 66° 1408 886 420 162 84
04-15 43° 60° 1437 905 430 164 84
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 38° 69° 1469 927 442 167 84
04-17 57° 76° 1513 961 466 184 96
04-18 62° 78° 1562 1000 494 204 111
04-19 52° 66° 1599 1027 511 213 115
04-20 52° 72° 1638 1056 531 225 122
04-21 51° 64° 1674 1082 547 232 124
04-22 48° 77° 1714 1112 567 244 131
04-23 53° 78° 1758 1146 591 260 142
04-24 53° 81° 1803 1181 616 277 154
04-25 61° 76° 1849 1217 642 295 167
04-26 51° 65° 1885 1243 658 303 170
04-27 47° 64° 1918 1266 671 308 170
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 55° 86° 1966 1304 699 329 186
04-29 55° 77° 2011 1339 723 345 197
04-30 50° 67° 2047 1365 740 353 200
05-01 62° 72° 2092 1400 765 370 212
05-02 52° 68° 2130 1428 783 380 217
05-03 49° 57° 2161 1449 793 383 217
05-04 43° 61° 2191 1469 804 385 217
05-05 47° 62° 2223 1491 816 390 217
05-06 43° 73° 2259 1517 832 398 220
05-07 53° 76° 2302 1550 855 412 229
05-08 51° 71° 2341 1579 874 423 236
05-09 45° 71° 2377 1605 890 431 238
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 43° 81° 2417 1635 910 443 245
05-11 49° 80° 2459 1667 932 457 255
05-12 57° 75° 2503 1701 956 473 266
05-13 58° 79° 2550 1738 982 492 279
05-14 58° 86° 2599 1777 1012 514 296
05-15 69° 90° 2657 1825 1050 543 321
05-16 60° 87° 2708 1866 1081 567 339
05-17 57° 73° 2752 1900 1104 582 349
05-18 51° 76° 2793 1931 1126 596 358
05-19 59° 79° 2840 1968 1153 614 372
05-20 60° 74° 2885 2003 1178 631 384
05-21 54° 65° 2923 2031 1195 641 388
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 47° 61° 2955 2053 1207 645 388
05-23 44° 71° 2990 2078 1223 652 391
05-24 54° 72° 3031 2109 1244 665 398
05-25 56° 66° 3070 2138 1263 676 404
05-26 51° 71° 3109 2167 1282 687 411
05-27 55° 74° 3152 2200 1305 702 420
05-28 57° 69° 3193 2231 1326 715 428
05-29 54° 68° 3232 2260 1345 726 434
05-30 55° 77° 3276 2294 1369 742 445
05-31 58° 81° 3323 2331 1396 762 460
06-01 54° 75° 3366 2364 1419 776 470
06-02 55° 83° 3413 2401 1446 795 484
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 68° 84° 3467 2445 1480 822 505
06-04 64° 69° 3512 2480 1504 838 516
06-05 61° 74° 3557 2515 1530 855 528
06-06 61° 72° 3601 2549 1554 872 540
06-07 59° 73° 3645 2583 1578 888 551
06-08 59° 81° 3693 2621 1606 908 566
06-09 55° 77° 3738 2656 1630 924 577
06-10 53° 77° 3780 2688 1653 939 587
06-11 58° 85° 3830 2728 1683 961 604
06-12 63° 81° 3881 2769 1713 983 621
06-13 67° 78° 3931 2809 1744 1005 639
06-14 68° 77° 3982 2850 1775 1028 656
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 61° 79° 4030 2888 1803 1048 671
06-16 67° 85° 4083 2931 1836 1074 692
06-17 68° 87° 4139 2977 1872 1101 714
06-18 67° 76° 4188 3016 1901 1123 731
06-19 64° 83° 4240 3058 1933 1146 750
06-20 65° 86° 4294 3102 1966 1172 770
06-21 76° 93° 4356 3154 2009 1206 799
06-22 75° 93° 4418 3206 2051 1240 828
06-23 75° 93° 4480 3258 2093 1274 857
06-24 76° 91° 4542 3310 2134 1308 886
06-25 73° 92° 4602 3360 2175 1340 914
06-26 75° 91° 4663 3411 2216 1373 942
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 71° 86° 4720 3458 2253 1402 966
06-28 69° 89° 4777 3505 2290 1431 990
06-29 69° 82° 4831 3549 2323 1457 1010
06-30 68° 85° 4885 3593 2358 1484 1032
07-01 66° 83° 4938 3636 2391 1508 1051
07-02 63° 86° 4991 3679 2423 1533 1071
07-03 67° 89° 5047 3725 2459 1561 1094
07-04 68° 91° 5104 3772 2497 1590 1119
07-05 70° 90° 5162 3820 2535 1621 1144
07-06 74° 87° 5221 3869 2574 1651 1170
07-07 68° 86° 5276 3914 2609 1679 1192
07-08 68° 82° 5329 3957 2642 1703 1212
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 67° 88° 5385 4003 2678 1731 1234
07-10 69° 89° 5442 4050 2714 1760 1258
07-11 71° 91° 5501 4099 2753 1791 1284
07-12 66° 84° 5553 4141 2786 1816 1304
07-13 70° 79° 5606 4184 2819 1840 1323
07-14 67° 85° 5660 4228 2853 1866 1345
07-15 68° 85° 5714 4272 2887 1893 1366
07-16 71° 90° 5773 4321 2926 1923 1391
07-17 72° 83° 5828 4366 2961 1951 1414
07-18 66° 83° 5881 4409 2994 1975 1433
07-19 70° 83° 5935 4453 3028 2002 1455
07-20 73° 83° 5991 4499 3064 2029 1478
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 72° 86° 6048 4546 3101 2058 1502
07-22 72° 88° 6106 4594 3139 2088 1527
07-23 76° 92° 6168 4646 3181 2122 1556
07-24 76° 90° 6229 4697 3222 2155 1584
07-25 72° 89° 6288 4746 3260 2186 1609
07-26 72° 87° 6345 4793 3298 2215 1633
07-27 73° 89° 6404 4842 3337 2246 1660
07-28 77° 92° 6466 4894 3379 2281 1689
07-29 71° 91° 6525 4943 3418 2312 1715
07-30 71° 83° 6580 4988 3453 2339 1737
07-31 66° 78° 6630 5028 3483 2361 1754
08-01 61° 78° 6678 5066 3511 2380 1768
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 59° 77° 6724 5102 3537 2398 1782
08-03 56° 78° 6769 5137 3562 2415 1793
08-04 61° 81° 6818 5176 3591 2436 1810
08-05 62° 82° 6868 5216 3621 2458 1827
08-06 63° 86° 6920 5258 3653 2483 1846
08-07 71° 83° 6976 5304 3688 2510 1868
08-08 70° 89° 7033 5351 3726 2540 1893
08-09 73° 89° 7092 5400 3765 2570 1919
08-10 73° 84° 7148 5446 3801 2599 1942
08-11 69° 88° 7205 5493 3838 2627 1966
08-12 71° 86° 7262 5540 3875 2656 1989
08-13 66° 85° 7315 5583 3908 2681 2010
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 64° 85° 7368 5626 3941 2706 2030
08-15 69° 92° 7427 5675 3979 2737 2055
08-16 75° 94° 7489 5727 4022 2771 2085
08-17 74° 91° 7550 5778 4062 2804 2112
08-18 75° 93° 7612 5830 4104 2838 2141
08-19 73° 87° 7670 5878 4143 2868 2167
08-20 65° 84° 7723 5921 4176 2893 2186
08-21 61° 79° 7770 5958 4203 2913 2201
08-22 59° 80° 7818 5996 4231 2932 2215
08-23 62° 83° 7869 6037 4261 2955 2233
08-24 54° 75° 7911 6069 4284 2969 2243
08-25 50° 72° 7950 6098 4303 2980 2249
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 46° 74° 7989 6127 4321 2991 2254
08-27 48° 76° 8029 6157 4341 3003 2261
08-28 55° 83° 8075 6193 4368 3022 2275
08-29 57° 81° 8122 6230 4395 3041 2289
08-30 60° 79° 8170 6268 4423 3060 2304
08-31 59° 77° 8216 6304 4449 3078 2317
09-01 54° 80° 8261 6339 4474 3095 2329
09-02 49° 80° 8304 6372 4497 3110 2338
09-03 54° 80° 8348 6406 4521 3127 2350
09-04 48° 70° 8386 6434 4539 3136 2354
09-05 53° 67° 8424 6462 4557 3146 2360
09-06 45° 72° 8461 6489 4574 3155 2363
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 42° 70° 8495 6513 4588 3161 2364
09-08 44° 75° 8532 6540 4605 3170 2369
09-09 48° 77° 8573 6571 4625 3183 2376
09-10 53° 85° 8620 6608 4653 3202 2390
09-11 55° 87° 8669 6647 4682 3223 2406
09-12 58° 91° 8721 6689 4714 3247 2426
09-13 67° 95° 8780 6738 4753 3278 2452
09-14 65° 96° 8839 6787 4792 3309 2478
09-15 66° 92° 8896 6834 4829 3338 2501
09-16 59° 90° 8948 6876 4861 3363 2521
09-17 55° 89° 8999 6917 4891 3385 2538
09-18 56° 92° 9051 6959 4924 3409 2557
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 64° 85° 9103 7001 4956 3433 2577
09-20 61° 83° 9153 7041 4986 3456 2594
09-21 61° 84° 9204 7082 5017 3478 2612
09-22 64° 79° 9254 7122 5047 3500 2628
09-23 63° 79° 9303 7161 5075 3521 2644
09-24 63° 75° 9349 7197 5102 3540 2658
09-25 53° 77° 9393 7231 5125 3555 2668
09-26 50° 83° 9437 7265 5150 3571 2680
09-27 52° 86° 9484 7302 5177 3590 2694
09-28 52° 88° 9532 7340 5205 3611 2709
09-29 55° 89° 9583 7381 5235 3633 2726
09-30 57° 88° 9633 7421 5266 3655 2744
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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