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Japanese Beetle Adults Emerge, Breed and Feed (GDD 50)
through Mon, Mar. 30. 2026

 

GDD Total: 167 (Base 50) through Mon, Mar. 30, 2026

  

Indianapolis, IN

        

Forecast »

“Flashback” to 2025

3/27

3/28

3/29

3/30

3/31

4/1

4/2

4/3

4/4

4/5

4/6

4/7

4/8

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 38° 53° 24 14 4 0 0
02-16 33° 58° 47 27 7 0 0
02-17 37° 56° 71 41 11 0 0
02-18 50° 69° 109 69 29 10 5
02-19 50° 65° 144 94 44 17 7
02-20 32° 56° 166 106 46 17 7
02-21 26° 35° 175 106 46 17 7
02-22 22° 29° 178 106 46 17 7
02-23 19° 28° 179 106 46 17 7
02-24 18° 39° 186 106 46 17 7
02-25 35° 51° 207 117 47 17 7
02-26 32° 49° 225 126 47 17 7
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 35° 63° 252 142 54 17 7
02-28 38° 59° 278 159 60 17 7
03-01 29° 39° 290 160 60 17 7
03-02 27° 39° 301 161 60 17 7
03-03 36° 45° 319 170 60 17 7
03-04 43° 55° 347 187 68 17 7
03-05 55° 62° 384 214 84 26 11
03-06 58° 76° 429 249 110 43 23
03-07 45° 67° 463 273 124 49 24
03-08 39° 58° 489 289 130 49 24
03-09 42° 70° 523 313 144 55 25
03-10 63° 71° 568 349 169 72 37
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 37° 70° 600 370 181 76 37
03-12 30° 48° 617 377 181 76 37
03-13 41° 57° 644 394 188 76 37
03-14 34° 48° 663 403 188 76 37
03-15 42° 73° 698 429 203 83 39
03-16 21° 57° 716 436 203 83 39
03-17 15° 23° 716 436 203 83 39
03-18 21° 48° 728 439 203 83 39
03-19 38° 70° 760 461 215 87 39
03-20 48° 77° 801 491 235 99 47
03-21 43° 72° 836 517 251 107 49
03-22 49° 85° 881 552 276 124 62
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 32° 44° 897 558 276 124 62
03-24 29° 52° 916 567 276 124 62
03-25 41° 70° 950 590 289 129 62
03-26 60° 84° 999 630 319 151 79
03-27 36° 55° 1022 643 322 151 79
03-28 29° 48° 1039 649 322 151 79
03-29 36° 67° 1068 669 331 152 79
03-30 55° 76° 1112 702 354 167 89
03-31 63° 79° 1161 741 383 188 105
04-01 43° 74° 1197 767 400 197 108
04-02 43° 77° 1235 796 418 207 114
04-03 64° 78° 1284 835 447 228 130
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 64° 72° 1330 871 473 246 143
04-05 40° 52° 1354 885 477 246 143
04-06 38° 56° 1380 900 482 246 143
04-07 33° 50° 1399 910 482 246 143
04-08 33° 61° 1424 925 487 246 143
04-09 49° 71° 1462 953 506 256 148
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 33° 40° 15 5 0 0 0
02-16 21° 36° 21 5 0 0 0
02-17 8° 18° 21 5 0 0 0
02-18 8° 17° 21 5 0 0 0
02-19 13° 19° 21 5 0 0 0
02-20 2° 20° 21 5 0 0 0
02-21 14° 29° 21 5 0 0 0
02-22 14° 35° 23 5 0 0 0
02-23 21° 46° 35 6 0 0 0
02-24 33° 55° 57 18 2 0 0
02-25 38° 60° 83 34 8 0 0
02-26 32° 62° 108 49 13 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 41° 55° 134 65 19 0 0
02-28 30° 63° 158 79 23 0 0
03-01 21° 47° 170 81 23 0 0
03-02 15° 36° 174 81 23 0 0
03-03 25° 46° 187 85 23 0 0
03-04 43° 65° 219 107 35 4 0
03-05 33° 55° 242 119 38 4 0
03-06 31° 41° 256 123 38 4 0
03-07 32° 43° 271 128 38 4 0
03-08 31° 49° 289 137 38 4 0
03-09 33° 58° 312 150 41 4 0
03-10 35° 67° 341 169 49 5 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 46° 72° 378 195 66 14 4
03-12 38° 74° 412 219 80 19 5
03-13 40° 75° 447 245 96 27 7
03-14 52° 77° 490 278 118 42 17
03-15 56° 69° 531 308 139 54 25
03-16 33° 57° 554 321 142 54 25
03-17 28° 50° 571 329 142 54 25
03-18 41° 74° 607 354 158 62 27
03-19 55° 65° 645 383 176 72 33
03-20 35° 51° 666 394 177 72 33
03-21 29° 56° 687 404 178 72 33
03-22 39° 52° 710 418 181 72 33
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 34° 46° 728 426 181 72 33
03-24 36° 53° 750 438 184 72 33
03-25 37° 50° 772 449 185 72 33
03-26 30° 54° 792 459 185 72 33
03-27 37° 58° 818 475 191 72 33
03-28 49° 80° 860 508 214 87 42
03-29 64° 72° 906 544 240 105 55
03-30 56° 72° 948 576 262 119 64
03-31 36° 57° 973 591 266 119 64
04-01 29° 53° 992 600 266 119 64
04-02 47° 81° 1034 632 288 133 73
04-03 51° 65° 1070 658 304 141 77
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 46° 55° 1099 677 313 142 77
04-05 45° 60° 1130 697 324 145 77
04-06 36° 45° 1148 706 324 145 77
04-07 32° 55° 1170 717 325 145 77
04-08 26° 42° 1182 719 325 145 77
04-09 31° 45° 1197 725 325 145 77
04-10 38° 62° 1225 743 333 145 77
04-11 38° 51° 1248 755 336 145 77
04-12 31° 58° 1270 768 338 145 77
04-13 44° 63° 1302 790 350 148 77
04-14 56° 73° 1344 822 372 163 86
04-15 46° 54° 1372 840 380 163 86
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 36° 59° 1398 855 386 163 86
04-17 40° 66° 1429 876 396 165 86
04-18 58° 80° 1475 913 423 184 100
04-19 55° 72° 1517 945 445 198 108
04-20 50° 76° 1558 975 466 211 116
04-21 53° 70° 1597 1005 485 222 122
04-22 45° 72° 1634 1031 501 230 126
04-23 50° 78° 1676 1063 524 245 135
04-24 53° 82° 1721 1099 549 262 147
04-25 60° 69° 1764 1131 571 276 157
04-26 45° 61° 1794 1152 582 279 157
04-27 43° 66° 1827 1175 595 284 157
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 53° 82° 1873 1210 620 301 169
04-29 63° 79° 1921 1249 649 322 185
04-30 50° 72° 1960 1278 668 333 191
05-01 65° 75° 2008 1316 696 353 206
05-02 59° 73° 2052 1350 720 369 217
05-03 52° 61° 2087 1374 734 375 218
05-04 47° 51° 2113 1391 741 375 218
05-05 50° 61° 2147 1414 755 381 218
05-06 49° 72° 2185 1443 773 391 224
05-07 52° 77° 2228 1475 796 406 233
05-08 54° 71° 2268 1506 816 418 241
05-09 42° 67° 2301 1529 829 423 241
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 43° 77° 2339 1557 847 433 246
05-11 50° 80° 2382 1590 870 448 256
05-12 59° 76° 2428 1625 896 466 269
05-13 63° 75° 2475 1662 923 485 283
05-14 62° 77° 2522 1700 950 504 297
05-15 65° 86° 2576 1744 984 530 318
05-16 63° 84° 2628 1786 1016 554 337
05-17 61° 69° 2671 1819 1039 569 347
05-18 54° 75° 2713 1851 1061 583 356
05-19 52° 76° 2756 1883 1083 598 365
05-20 54° 68° 2794 1912 1102 608 371
05-21 54° 62° 2830 1938 1118 616 374
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 50° 57° 2862 1959 1130 620 374
05-23 42° 66° 2894 1981 1141 623 374
05-24 48° 70° 2930 2008 1158 632 378
05-25 51° 64° 2966 2033 1173 640 380
05-26 48° 71° 3003 2061 1191 649 385
05-27 59° 68° 3045 2092 1212 663 393
05-28 58° 67° 3085 2123 1233 675 401
05-29 54° 69° 3125 2153 1253 687 408
05-30 59° 74° 3170 2187 1277 704 419
05-31 58° 74° 3214 2221 1302 720 430
06-01 42° 75° 3250 2248 1318 728 434
06-02 48° 80° 3292 2280 1340 742 443
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 60° 86° 3343 2321 1371 765 461
06-04 69° 84° 3398 2366 1406 792 483
06-05 68° 75° 3448 2405 1435 814 499
06-06 67° 79° 3499 2446 1467 837 517
06-07 64° 76° 3547 2484 1494 856 532
06-08 65° 77° 3596 2523 1523 877 548
06-09 61° 76° 3642 2560 1550 896 561
06-10 57° 75° 3686 2593 1573 912 572
06-11 57° 83° 3734 2632 1602 932 587
06-12 62° 83° 3785 2672 1633 955 605
06-13 70° 79° 3837 2715 1665 979 625
06-14 69° 76° 3888 2755 1696 1002 642
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 66° 79° 3939 2796 1727 1025 660
06-16 66° 81° 3991 2838 1758 1048 679
06-17 70° 83° 4045 2882 1793 1075 700
06-18 68° 86° 4100 2928 1828 1102 723
06-19 69° 81° 4153 2970 1861 1127 742
06-20 65° 83° 4205 3013 1893 1151 761
06-21 70° 91° 4263 3061 1931 1181 787
06-22 75° 92° 4325 3112 1973 1215 815
06-23 74° 93° 4386 3164 2014 1248 844
06-24 76° 93° 4449 3216 2057 1283 873
06-25 76° 90° 4510 3267 2098 1316 901
06-26 73° 90° 4570 3317 2137 1347 928
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 76° 89° 4630 3367 2178 1380 955
06-28 74° 87° 4689 3416 2216 1411 981
06-29 73° 83° 4744 3462 2252 1438 1004
06-30 73° 85° 4801 3509 2289 1467 1028
07-01 72° 85° 4857 3555 2325 1495 1051
07-02 63° 84° 4909 3596 2357 1519 1069
07-03 69° 88° 4965 3643 2393 1547 1093
07-04 67° 89° 5021 3689 2429 1575 1116
07-05 70° 91° 5080 3737 2468 1606 1141
07-06 72° 88° 5138 3786 2506 1636 1167
07-07 71° 79° 5191 3829 2539 1661 1187
07-08 64° 86° 5244 3872 2572 1686 1207
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 70° 83° 5299 3916 2607 1713 1228
07-10 68° 89° 5355 3963 2643 1741 1252
07-11 71° 90° 5414 4011 2681 1771 1277
07-12 73° 86° 5471 4059 2719 1801 1302
07-13 70° 86° 5527 4105 2755 1829 1325
07-14 70° 85° 5583 4150 2791 1857 1347
07-15 71° 84° 5638 4196 2826 1884 1370
07-16 72° 85° 5694 4242 2862 1912 1393
07-17 69° 85° 5750 4287 2897 1939 1415
07-18 69° 82° 5803 4331 2931 1965 1436
07-19 68° 82° 5857 4374 2964 1990 1456
07-20 73° 83° 5913 4420 3001 2019 1479
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 72° 83° 5968 4466 3036 2046 1502
07-22 66° 85° 6021 4509 3069 2071 1522
07-23 65° 89° 6076 4554 3104 2098 1543
07-24 73° 92° 6136 4604 3144 2130 1571
07-25 76° 87° 6196 4653 3184 2162 1597
07-26 74° 89° 6255 4703 3223 2193 1624
07-27 76° 89° 6315 4753 3263 2225 1651
07-28 73° 86° 6373 4801 3301 2255 1676
07-29 73° 92° 6434 4851 3342 2288 1703
07-30 71° 90° 6492 4900 3380 2318 1729
07-31 67° 76° 6542 4939 3410 2340 1745
08-01 59° 75° 6587 4975 3435 2357 1758
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 58° 75° 6632 5009 3459 2374 1769
08-03 56° 80° 6678 5046 3486 2392 1782
08-04 63° 81° 6728 5086 3516 2414 1799
08-05 66° 80° 6779 5127 3547 2437 1818
08-06 64° 85° 6832 5169 3579 2462 1837
08-07 67° 87° 6887 5214 3614 2488 1859
08-08 67° 88° 6942 5259 3649 2516 1881
08-09 69° 89° 6999 5306 3687 2545 1905
08-10 69° 89° 7056 5353 3724 2574 1929
08-11 70° 90° 7114 5401 3761 2603 1954
08-12 70° 85° 7169 5447 3797 2631 1977
08-13 69° 85° 7224 5492 3832 2658 1999
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 66° 86° 7278 5536 3866 2684 2020
08-15 66° 89° 7334 5582 3902 2712 2043
08-16 70° 89° 7392 5629 3939 2742 2067
08-17 69° 87° 7448 5675 3975 2769 2090
08-18 70° 85° 7503 5721 4011 2797 2113
08-19 71° 85° 7559 5767 4047 2825 2136
08-20 69° 75° 7610 5807 4077 2847 2153
08-21 66° 76° 7659 5846 4106 2868 2169
08-22 62° 77° 7706 5884 4134 2888 2184
08-23 64° 79° 7756 5923 4163 2910 2200
08-24 59° 75° 7801 5958 4188 2927 2212
08-25 53° 71° 7841 5988 4208 2938 2219
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 50° 72° 7880 6017 4228 2950 2225
08-27 48° 75° 7920 6047 4248 2962 2232
08-28 54° 75° 7962 6080 4270 2976 2242
08-29 53° 75° 8004 6112 4292 2990 2251
08-30 49° 76° 8045 6143 4313 3003 2259
08-31 49° 77° 8086 6174 4334 3016 2267
09-01 51° 81° 8130 6208 4358 3032 2277
09-02 54° 82° 8176 6244 4384 3050 2291
09-03 54° 81° 8222 6279 4409 3068 2303
09-04 55° 70° 8262 6310 4430 3080 2311
09-05 53° 74° 8303 6341 4451 3093 2319
09-06 53° 69° 8343 6370 4470 3104 2325
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 50° 70° 8381 6398 4489 3115 2330
09-08 43° 73° 8417 6424 4504 3123 2333
09-09 46° 76° 8456 6453 4524 3134 2339
09-10 53° 82° 8502 6489 4549 3151 2352
09-11 56° 84° 8549 6527 4577 3171 2367
09-12 55° 85° 8598 6565 4605 3191 2382
09-13 56° 80° 8644 6601 4631 3209 2395
09-14 63° 86° 8696 6644 4664 3234 2415
09-15 59° 87° 8748 6685 4695 3258 2433
09-16 60° 86° 8798 6726 4726 3280 2451
09-17 57° 86° 8848 6765 4755 3302 2467
09-18 58° 88° 8899 6806 4787 3325 2485
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 59° 88° 8950 6847 4818 3348 2503
09-20 61° 88° 9002 6890 4850 3372 2523
09-21 65° 83° 9054 6932 4882 3396 2542
09-22 64° 72° 9100 6968 4908 3414 2555
09-23 63° 78° 9148 7006 4936 3434 2570
09-24 64° 79° 9198 7045 4966 3456 2586
09-25 63° 75° 9245 7082 4992 3475 2600
09-26 54° 79° 9289 7117 5017 3491 2612
09-27 54° 84° 9336 7154 5044 3510 2626
09-28 57° 88° 9387 7194 5074 3533 2643
09-29 58° 88° 9437 7235 5105 3555 2661
09-30 59° 84° 9487 7274 5134 3577 2677
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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