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Bluegrass Billbug Activity - OSU (GDD 50)
forecast for Tue, Apr. 14. 2026

 

Forecasted GDD Total: 131 (Base 50) through Tue, Apr. 14, 2026

  

Belleville, MI

        

Forecast »

“Flashback” to 2025

4/6

4/7

4/8

4/9

4/10

4/11

4/12

4/13

4/14

4/15

4/16

4/17

4/18

Visual turfgrass damage

1330

Larvae emergence - contacts

926

Larvae hatch; stem tunneling

650

Egg Lay - systemics

560

First Emergence

280

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 26° 48° 15 5 0 0 0
02-16 25° 51° 31 11 0 0 0
02-17 37° 54° 55 25 4 0 0
02-18 37° 60° 82 42 10 0 0
02-19 33° 38° 95 45 10 0 0
02-20 33° 42° 110 50 10 0 0
02-21 30° 35° 121 51 10 0 0
02-22 25° 31° 127 51 10 0 0
02-23 21° 26° 128 51 10 0 0
02-24 16° 34° 131 51 10 0 0
02-25 21° 36° 137 51 10 0 0
02-26 13° 35° 139 51 10 0 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 26° 57° 159 60 10 0 0
02-28 26° 50° 175 66 10 0 0
03-01 18° 29° 177 66 10 0 0
03-02 17° 33° 180 66 10 0 0
03-03 24° 38° 189 66 10 0 0
03-04 31° 45° 205 72 10 0 0
03-05 35° 43° 222 79 10 0 0
03-06 36° 56° 246 93 14 0 0
03-07 48° 66° 280 117 29 7 2
03-08 41° 59° 308 135 37 7 2
03-09 44° 72° 344 161 53 15 5
03-10 42° 74° 380 187 69 23 8
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 34° 61° 406 203 75 23 8
03-12 29° 43° 420 207 75 23 8
03-13 31° 50° 438 215 75 23 8
03-14 27° 39° 449 216 75 23 8
03-15 33° 70° 478 235 84 24 8
03-16 22° 67° 500 247 86 24 8
03-17 17° 25° 500 247 86 24 8
03-18 17° 33° 503 247 86 24 8
03-19 31° 54° 524 258 86 24 8
03-20 36° 72° 556 280 99 28 8
03-21 35° 43° 573 287 99 28 8
03-22 34° 55° 596 300 101 28 8
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 28° 36° 606 300 101 28 8
03-24 19° 45° 616 300 101 28 8
03-25 32° 62° 641 315 106 28 8
03-26 46° 69° 676 340 122 36 11
03-27 27° 41° 688 342 122 36 11
03-28 26° 43° 701 345 122 36 11
03-29 32° 56° 723 357 124 36 11
03-30 43° 73° 759 383 140 44 14
03-31 61° 75° 805 419 166 62 27
04-01 33° 55° 827 431 168 62 27
04-02 33° 53° 848 442 170 62 27
04-03 51° 72° 888 472 189 74 34
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 40° 63° 917 491 199 75 34
04-05 36° 47° 937 501 199 75 34
04-06 33° 51° 956 510 199 75 34
04-07 22° 39° 965 510 199 75 34
04-08 24° 53° 982 517 199 75 34
04-09 45° 67° 1016 542 213 82 35
04-10 41° 55° 1043 558 219 82 35
04-11 37° 55° 1067 572 223 82 35
04-12 42° 81° 1106 601 243 93 41
04-13 60° 77° 1152 638 269 111 55
04-14 62° 78° 1200 676 297 131 70
04-15 62° 74° 1246 712 323 149 83
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 60° 74° 1291 747 348 166 95
04-17 52° 77° 1334 779 371 181 104
04-18 58° 76° 1379 814 395 198 116
04-19 43° 58° 1407 832 404 198 116
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 21° 33° 5 0 0 0 0
02-16 21° 30° 8 0 0 0 0
02-17 6° 22° 8 0 0 0 0
02-18 0° 17° 8 0 0 0 0
02-19 4° 18° 8 0 0 0 0
02-20 13° 23° 8 0 0 0 0
02-21 20° 32° 12 0 0 0 0
02-22 17° 30° 14 0 0 0 0
02-23 22° 36° 21 0 0 0 0
02-24 32° 51° 40 10 0 0 0
02-25 37° 55° 65 24 4 0 0
02-26 29° 37° 76 25 4 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 34° 44° 93 32 4 0 0
02-28 29° 56° 114 43 5 0 0
03-01 23° 40° 123 43 5 0 0
03-02 17° 30° 125 43 5 0 0
03-03 20° 40° 133 43 5 0 0
03-04 34° 48° 152 52 5 0 0
03-05 36° 56° 175 66 9 0 0
03-06 27° 36° 185 66 9 0 0
03-07 27° 39° 196 67 9 0 0
03-08 23° 38° 205 67 9 0 0
03-09 32° 55° 226 79 11 0 0
03-10 34° 65° 254 96 18 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 34° 58° 278 111 22 0 0
03-12 29° 48° 295 117 22 0 0
03-13 28° 58° 315 128 23 0 0
03-14 34° 71° 346 148 34 3 0
03-15 57° 73° 389 181 57 18 10
03-16 32° 58° 412 195 60 18 10
03-17 27° 45° 427 199 60 18 10
03-18 35° 69° 457 219 70 20 10
03-19 55° 73° 499 251 92 34 19
03-20 33° 59° 523 265 96 34 19
03-21 27° 53° 540 273 96 34 19
03-22 29° 48° 557 280 96 34 19
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 23° 39° 566 280 96 34 19
03-24 33° 43° 582 286 96 34 19
03-25 29° 46° 598 291 96 34 19
03-26 29° 45° 613 296 96 34 19
03-27 26° 56° 632 306 96 34 19
03-28 42° 65° 663 327 107 37 19
03-29 60° 68° 705 359 129 51 28
03-30 52° 68° 743 387 147 61 33
03-31 40° 58° 770 404 154 61 33
04-01 25° 43° 782 406 154 61 33
04-02 34° 49° 802 416 154 61 33
04-03 47° 65° 836 440 168 67 34
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 38° 52° 859 452 171 67 34
04-05 43° 49° 882 466 174 67 34
04-06 36° 47° 902 475 174 67 34
04-07 28° 47° 917 481 174 67 34
04-08 24° 38° 926 481 174 67 34
04-09 25° 45° 939 484 174 67 34
04-10 33° 37° 952 487 174 67 34
04-11 31° 52° 972 497 174 67 34
04-12 29° 56° 993 507 175 67 34
04-13 39° 57° 1018 523 181 67 34
04-14 46° 72° 1055 550 198 76 38
04-15 41° 53° 1080 565 203 76 38
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 36° 53° 1103 577 205 76 38
04-17 30° 60° 1126 590 208 76 38
04-18 49° 83° 1170 624 232 92 49
04-19 52° 70° 1209 653 251 103 55
04-20 41° 58° 1236 671 259 103 55
04-21 47° 73° 1274 699 277 113 60
04-22 43° 66° 1307 721 289 117 60
04-23 47° 78° 1347 752 310 130 67
04-24 47° 83° 1390 785 333 145 77
04-25 54° 76° 1433 818 356 160 87
04-26 44° 62° 1464 838 366 162 87
04-27 37° 66° 1493 858 376 164 87
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 42° 73° 1529 883 391 171 89
04-29 54° 84° 1576 920 418 190 103
04-30 39° 62° 1604 939 426 191 103
05-01 45° 70° 1640 964 442 198 106
05-02 55° 70° 1680 995 463 211 114
05-03 46° 54° 1709 1013 471 211 114
05-04 43° 52° 1734 1029 477 211 114
05-05 48° 67° 1770 1055 492 219 117
05-06 54° 60° 1805 1079 507 226 119
05-07 51° 76° 1846 1111 528 239 127
05-08 44° 59° 1876 1130 538 241 127
05-09 35° 65° 1904 1149 547 241 127
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 45° 80° 1944 1179 567 254 134
05-11 45° 67° 1979 1203 581 260 135
05-12 45° 80° 2019 1233 601 272 142
05-13 62° 69° 2062 1267 625 287 153
05-14 59° 76° 2108 1302 650 305 165
05-15 59° 81° 2156 1341 678 325 181
05-16 59° 83° 2205 1380 708 346 197
05-17 58° 72° 2248 1413 730 361 207
05-18 52° 66° 2285 1440 748 370 211
05-19 48° 60° 2317 1462 760 375 211
05-20 40° 55° 2343 1478 765 375 211
05-21 49° 53° 2372 1496 774 375 211
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 49° 53° 2401 1515 783 376 211
05-23 42° 55° 2427 1532 789 376 211
05-24 43° 62° 2457 1552 800 379 211
05-25 40° 66° 2489 1573 811 382 211
05-26 43° 70° 2523 1598 826 389 212
05-27 51° 71° 2563 1627 845 400 219
05-28 53° 59° 2597 1651 859 406 220
05-29 55° 67° 2635 1680 878 417 225
05-30 50° 76° 2677 1711 899 430 234
05-31 52° 64° 2712 1737 915 438 237
06-01 42° 68° 2745 1760 928 443 237
06-02 44° 79° 2785 1790 948 455 243
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 54° 88° 2834 1829 977 475 259
06-04 66° 85° 2888 1872 1010 501 280
06-05 56° 66° 2926 1901 1029 512 286
06-06 58° 75° 2971 1935 1053 528 297
06-07 55° 78° 3015 1970 1078 545 308
06-08 58° 77° 3061 2006 1104 562 321
06-09 59° 78° 3108 2042 1130 581 335
06-10 52° 74° 3149 2073 1151 594 343
06-11 55° 85° 3197 2111 1179 614 358
06-12 62° 77° 3244 2149 1207 633 372
06-13 58° 72° 3287 2182 1230 648 382
06-14 58° 75° 3331 2216 1254 665 393
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 55° 81° 3377 2252 1280 683 407
06-16 58° 82° 3425 2290 1308 703 421
06-17 62° 87° 3478 2333 1341 727 441
06-18 68° 82° 3531 2376 1374 752 461
06-19 63° 76° 3578 2413 1401 772 475
06-20 59° 80° 3626 2451 1429 791 490
06-21 68° 92° 3684 2498 1466 821 515
06-22 78° 95° 3749 2553 1511 858 547
06-23 75° 96° 3812 2607 1554 893 577
06-24 76° 94° 3875 2660 1597 928 607
06-25 72° 85° 3932 2706 1634 957 631
06-26 66° 84° 3985 2749 1667 982 651
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 71° 91° 4044 2798 1706 1013 677
06-28 70° 83° 4098 2843 1741 1040 698
06-29 63° 87° 4151 2886 1774 1065 718
06-30 69° 84° 4206 2930 1808 1091 740
07-01 72° 85° 4262 2977 1845 1120 763
07-02 62° 87° 4315 3019 1877 1144 783
07-03 67° 87° 4370 3065 1913 1171 805
07-04 62° 89° 4424 3108 1946 1197 826
07-05 68° 92° 4481 3156 1984 1227 851
07-06 71° 93° 4542 3206 2024 1259 878
07-07 66° 77° 4591 3246 2054 1281 894
07-08 56° 85° 4640 3284 2082 1301 910
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 69° 80° 4692 3327 2115 1326 929
07-10 64° 86° 4745 3370 2148 1351 949
07-11 66° 86° 4799 3414 2182 1376 970
07-12 72° 88° 4857 3462 2219 1406 995
07-13 70° 88° 4914 3509 2257 1436 1019
07-14 65° 85° 4967 3552 2290 1461 1039
07-15 62° 89° 5021 3595 2323 1486 1060
07-16 71° 85° 5077 3641 2359 1514 1083
07-17 68° 77° 5127 3682 2389 1536 1100
07-18 57° 77° 5172 3717 2415 1553 1112
07-19 58° 83° 5220 3755 2443 1574 1128
07-20 66° 78° 5270 3795 2473 1596 1145
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 57° 79° 5317 3831 2499 1614 1158
07-22 54° 82° 5363 3867 2525 1632 1171
07-23 57° 88° 5413 3908 2556 1655 1188
07-24 72° 96° 5475 3960 2598 1689 1217
07-25 72° 85° 5531 4006 2634 1717 1240
07-26 72° 81° 5586 4050 2668 1743 1262
07-27 73° 90° 5646 4100 2708 1775 1289
07-28 69° 88° 5702 4147 2745 1804 1312
07-29 69° 87° 5758 4193 2781 1832 1335
07-30 64° 86° 5811 4236 2814 1857 1355
07-31 59° 74° 5856 4270 2838 1873 1367
08-01 56° 76° 5900 4304 2862 1889 1378
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 53° 77° 5943 4338 2886 1904 1388
08-03 55° 79° 5988 4372 2910 1921 1400
08-04 57° 81° 6035 4409 2937 1940 1414
08-05 63° 83° 6086 4450 2968 1963 1432
08-06 65° 83° 6138 4493 3000 1987 1451
08-07 65° 84° 6190 4535 3033 2012 1470
08-08 64° 86° 6243 4578 3066 2037 1490
08-09 68° 88° 6299 4624 3102 2064 1513
08-10 68° 91° 6356 4671 3139 2094 1537
08-11 69° 90° 6414 4718 3176 2123 1562
08-12 70° 90° 6472 4767 3214 2153 1587
08-13 69° 83° 6526 4811 3249 2179 1608
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 63° 84° 6577 4852 3280 2203 1626
08-15 63° 85° 6629 4894 3312 2227 1645
08-16 66° 89° 6685 4939 3347 2254 1668
08-17 65° 82° 6736 4981 3379 2278 1687
08-18 55° 79° 6781 5016 3404 2295 1699
08-19 62° 78° 6830 5054 3432 2315 1714
08-20 65° 70° 6875 5090 3458 2333 1727
08-21 64° 75° 6923 5127 3485 2352 1741
08-22 56° 81° 6969 5164 3511 2370 1754
08-23 62° 78° 7017 5202 3540 2390 1769
08-24 55° 75° 7060 5235 3563 2406 1779
08-25 53° 68° 7099 5264 3581 2416 1785
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 48° 70° 7136 5291 3599 2425 1789
08-27 47° 74° 7175 5319 3617 2436 1795
08-28 51° 71° 7214 5349 3636 2447 1801
08-29 48° 67° 7249 5374 3652 2455 1803
08-30 44° 72° 7285 5400 3668 2463 1806
08-31 46° 76° 7325 5429 3687 2474 1813
09-01 48° 79° 7366 5461 3709 2488 1821
09-02 51° 80° 7409 5494 3732 2503 1832
09-03 50° 82° 7453 5528 3756 2519 1842
09-04 52° 67° 7491 5556 3774 2529 1847
09-05 45° 72° 7528 5583 3791 2537 1851
09-06 51° 65° 7564 5609 3807 2545 1854
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 42° 67° 7597 5632 3819 2550 1854
09-08 43° 70° 7631 5656 3834 2557 1856
09-09 44° 75° 7669 5683 3851 2566 1860
09-10 49° 78° 7710 5715 3873 2580 1869
09-11 50° 80° 7753 5748 3896 2595 1879
09-12 51° 81° 7797 5782 3920 2611 1890
09-13 53° 78° 7841 5816 3943 2626 1900
09-14 52° 82° 7886 5851 3969 2643 1912
09-15 55° 82° 7933 5887 3995 2662 1926
09-16 53° 84° 7979 5924 4021 2680 1939
09-17 53° 83° 8025 5960 4048 2699 1952
09-18 54° 87° 8074 5998 4076 2719 1968
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 62° 80° 8123 6037 4105 2740 1984
09-20 57° 80° 8169 6074 4132 2759 1998
09-21 59° 74° 8214 6108 4156 2775 2009
09-22 62° 75° 8261 6145 4183 2794 2023
09-23 60° 74° 8305 6180 4208 2811 2035
09-24 64° 74° 8353 6217 4235 2830 2049
09-25 61° 75° 8399 6254 4261 2848 2062
09-26 56° 79° 8444 6289 4287 2866 2075
09-27 55° 85° 8492 6327 4315 2886 2089
09-28 59° 81° 8540 6365 4343 2905 2104
09-29 51° 81° 8584 6399 4367 2921 2115
09-30 52° 81° 8629 6434 4391 2938 2127
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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