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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Bluegrass Billbug Activity - OSU (GDD 50)
forecast for Sun, Apr. 12. 2026

 

Forecasted GDD Total: 127 (Base 50) through Sun, Apr. 12, 2026

  

New York, NY

        

Forecast »

“Flashback” to 2025

4/4

4/5

4/6

4/7

4/8

4/9

4/10

4/11

4/12

4/13

4/14

4/15

4/16

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 28° 41° 13 3 0 0 0
02-16 30° 39° 25 5 0 0 0
02-17 30° 48° 42 12 0 0 0
02-18 34° 40° 57 17 0 0 0
02-19 36° 41° 73 23 0 0 0
02-20 35° 38° 88 28 0 0 0
02-21 35° 47° 107 37 0 0 0
02-22 30° 39° 120 40 0 0 0
02-23 28° 35° 129 40 0 0 0
02-24 21° 31° 133 40 0 0 0
02-25 21° 42° 142 40 0 0 0
02-26 29° 46° 158 46 0 0 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 24° 41° 169 46 0 0 0
02-28 30° 52° 188 55 0 0 0
03-01 30° 45° 203 60 0 0 0
03-02 22° 31° 208 60 0 0 0
03-03 26° 35° 216 60 0 0 0
03-04 35° 46° 235 69 0 0 0
03-05 39° 43° 254 78 0 0 0
03-06 37° 41° 271 85 0 0 0
03-07 36° 48° 292 96 1 0 0
03-08 48° 69° 328 122 17 9 4
03-09 43° 72° 363 147 32 16 6
03-10 41° 79° 402 176 51 26 11
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 51° 70° 441 205 70 37 17
03-12 35° 60° 466 220 75 37 17
03-13 30° 43° 481 225 75 37 17
03-14 35° 53° 503 237 77 37 17
03-15 35° 44° 521 245 77 37 17
03-16 46° 60° 552 266 88 40 17
03-17 31° 56° 573 277 90 40 17
03-18 26° 36° 582 277 90 40 17
03-19 29° 43° 596 281 90 40 17
03-20 34° 58° 620 295 94 40 17
03-21 48° 60° 652 317 106 44 17
03-22 43° 62° 682 337 116 46 17
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 34° 50° 702 347 116 46 17
03-24 31° 49° 720 355 116 46 17
03-25 34° 52° 741 366 117 46 17
03-26 45° 75° 779 394 136 57 23
03-27 42° 67° 812 417 148 61 23
03-28 31° 44° 828 423 148 61 23
03-29 29° 56° 848 433 149 61 23
03-30 44° 71° 884 459 164 69 25
03-31 60° 80° 932 497 192 89 41
04-01 56° 80° 978 533 219 108 54
04-02 41° 54° 1004 549 225 108 54
04-03 41° 67° 1036 571 237 112 54
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 44° 72° 1072 597 253 120 57
04-05 42° 57° 1099 614 260 120 57
04-06 40° 56° 1126 630 266 120 57
04-07 35° 56° 1149 644 269 120 57
04-08 29° 47° 1165 650 269 120 57
04-09 31° 48° 1182 657 269 120 57
04-10 41° 61° 1211 676 278 120 57
04-11 50° 63° 1246 701 292 127 58
04-12 43° 57° 1274 719 301 127 58
04-13 50° 74° 1314 749 321 139 65
04-14 60° 79° 1362 787 349 159 80
04-15 61° 83° 1412 827 379 182 97
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 65° 80° 1463 868 410 204 115
04-17 60° 73° 1508 903 435 221 127
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 27° 36° 9 0 0 0 0
02-16 33° 45° 26 7 0 0 0
02-17 27° 35° 36 7 0 0 0
02-18 19° 28° 37 7 0 0 0
02-19 17° 31° 39 7 0 0 0
02-20 18° 29° 41 7 0 0 0
02-21 22° 35° 48 7 0 0 0
02-22 21° 41° 57 7 0 0 0
02-23 30° 47° 73 14 0 0 0
02-24 30° 49° 91 21 0 0 0
02-25 39° 55° 116 36 5 0 0
02-26 40° 57° 142 53 11 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 43° 53° 168 69 18 0 0
02-28 39° 51° 192 82 21 0 0
03-01 29° 64° 216 97 25 0 0
03-02 21° 34° 222 97 25 0 0
03-03 21° 39° 230 97 25 0 0
03-04 28° 53° 248 105 25 0 0
03-05 40° 56° 274 121 31 0 0
03-06 34° 53° 296 133 33 0 0
03-07 33° 51° 316 143 34 0 0
03-08 36° 45° 335 152 34 0 0
03-09 30° 54° 355 162 34 0 0
03-10 40° 65° 386 183 45 3 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 36° 64° 414 201 53 3 0
03-12 41° 53° 439 216 58 3 0
03-13 36° 49° 460 227 59 3 0
03-14 39° 54° 485 242 63 3 0
03-15 41° 47° 507 254 65 3 0
03-16 46° 61° 539 276 77 7 0
03-17 38° 60° 566 293 84 7 0
03-18 33° 62° 591 308 90 7 0
03-19 37° 60° 617 324 96 7 0
03-20 42° 49° 641 338 99 7 0
03-21 38° 52° 664 351 102 7 0
03-22 36° 62° 691 368 110 7 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 30° 49° 709 376 110 7 0
03-24 39° 50° 732 389 112 7 0
03-25 44° 59° 761 408 122 8 0
03-26 38° 50° 783 420 124 8 0
03-27 32° 53° 803 430 124 8 0
03-28 41° 63° 834 451 134 10 0
03-29 46° 82° 876 483 156 24 9
03-30 42° 48° 899 496 160 24 9
03-31 45° 74° 937 524 178 34 14
04-01 41° 59° 965 542 186 34 14
04-02 34° 47° 983 550 186 34 14
04-03 45° 72° 1020 577 202 42 17
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 59° 71° 1063 610 225 57 27
04-05 44° 57° 1091 628 233 58 27
04-06 43° 56° 1119 646 241 58 27
04-07 40° 51° 1142 659 244 58 27
04-08 37° 45° 1161 668 244 58 27
04-09 30° 49° 1179 676 244 58 27
04-10 37° 49° 1200 687 245 58 27
04-11 42° 46° 1222 699 247 58 27
04-12 36° 42° 1239 706 247 58 27
04-13 40° 57° 1265 722 254 58 27
04-14 43° 66° 1298 745 266 62 27
04-15 50° 70° 1335 772 284 72 32
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 45° 51° 1362 789 290 72 32
04-17 43° 64° 1393 810 302 76 32
04-18 40° 68° 1425 832 313 79 32
04-19 56° 85° 1473 870 342 100 47
04-20 56° 74° 1516 903 365 114 57
04-21 47° 55° 1545 922 374 116 57
04-22 52° 80° 1589 956 398 131 68
04-23 55° 74° 1631 988 420 146 77
04-24 52° 75° 1672 1019 441 159 85
04-25 56° 76° 1716 1053 465 175 96
04-26 57° 72° 1759 1086 487 189 105
04-27 48° 60° 1791 1108 499 193 105
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 49° 76° 1831 1138 520 206 113
04-29 51° 78° 1874 1171 543 221 123
04-30 62° 75° 1921 1208 569 239 137
05-01 50° 68° 1958 1235 586 248 140
05-02 57° 83° 2005 1272 614 268 155
05-03 60° 84° 2056 1313 644 290 172
05-04 60° 70° 2099 1346 667 305 183
05-05 59° 61° 2137 1374 686 315 188
05-06 58° 65° 2176 1403 705 327 194
05-07 56° 75° 2220 1437 728 342 205
05-08 58° 77° 2266 1473 754 360 217
05-09 54° 60° 2300 1497 769 367 219
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 50° 75° 2341 1528 789 379 227
05-11 52° 80° 2385 1562 813 395 237
05-12 51° 72° 2424 1591 833 407 244
05-13 58° 68° 2465 1622 854 420 252
05-14 59° 63° 2504 1651 873 430 258
05-15 61° 69° 2547 1684 895 445 267
05-16 62° 70° 2591 1718 920 461 279
05-17 63° 85° 2643 1760 952 486 298
05-18 61° 75° 2689 1796 977 503 311
05-19 56° 71° 2730 1827 999 516 319
05-20 48° 69° 2767 1854 1015 525 322
05-21 49° 58° 2798 1875 1027 528 322
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 48° 51° 2826 1893 1034 528 322
05-23 48° 63° 2859 1916 1048 534 323
05-24 48° 66° 2894 1941 1063 541 325
05-25 52° 68° 2932 1969 1081 551 330
05-26 51° 74° 2973 2000 1101 564 338
05-27 54° 75° 3015 2032 1124 578 347
05-28 54° 66° 3053 2060 1142 588 352
05-29 55° 67° 3092 2089 1161 599 358
05-30 60° 75° 3138 2125 1186 616 370
05-31 56° 69° 3178 2155 1207 629 378
06-01 49° 69° 3215 2182 1224 638 382
06-02 51° 74° 3255 2212 1244 650 389
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 54° 81° 3301 2248 1270 668 402
06-04 57° 85° 3350 2287 1299 689 418
06-05 67° 89° 3406 2333 1335 717 441
06-06 70° 85° 3462 2379 1370 745 464
06-07 68° 76° 3512 2419 1400 767 481
06-08 63° 74° 3558 2455 1427 785 494
06-09 61° 64° 3599 2486 1447 797 501
06-10 63° 77° 3646 2523 1475 817 516
06-11 63° 85° 3698 2565 1507 841 535
06-12 68° 91° 3756 2613 1544 870 559
06-13 68° 79° 3807 2654 1576 894 578
06-14 60° 68° 3849 2686 1598 908 587
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 58° 62° 3888 2715 1616 918 592
06-16 60° 67° 3929 2746 1638 932 601
06-17 63° 68° 3973 2780 1661 947 611
06-18 65° 83° 4025 2822 1693 971 630
06-19 70° 90° 4083 2870 1731 1001 655
06-20 67° 85° 4137 2914 1765 1027 676
06-21 71° 89° 4195 2962 1804 1058 702
06-22 74° 88° 4254 3011 1842 1088 727
06-23 79° 98° 4320 3067 1888 1126 760
06-24 80° 102° 4389 3126 1937 1167 796
06-25 81° 99° 4457 3184 1986 1208 832
06-26 68° 85° 4512 3229 2020 1234 853
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 65° 71° 4557 3264 2046 1252 866
06-28 64° 85° 4610 3307 2079 1277 886
06-29 76° 91° 4671 3358 2120 1310 914
06-30 73° 90° 4731 3408 2159 1341 940
07-01 74° 88° 4790 3457 2198 1372 966
07-02 72° 84° 4846 3503 2234 1400 989
07-03 69° 92° 4904 3551 2273 1431 1015
07-04 64° 85° 4957 3594 2305 1455 1034
07-05 64° 88° 5011 3638 2339 1481 1055
07-06 70° 90° 5069 3686 2377 1511 1080
07-07 76° 87° 5128 3735 2417 1543 1107
07-08 75° 97° 5192 3789 2461 1579 1138
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 74° 93° 5254 3841 2502 1612 1166
07-10 71° 82° 5308 3885 2537 1639 1188
07-11 72° 84° 5365 3932 2573 1667 1211
07-12 73° 84° 5421 3978 2610 1696 1235
07-13 72° 82° 5476 4023 2645 1723 1257
07-14 73° 85° 5534 4071 2682 1752 1281
07-15 73° 85° 5591 4118 2719 1782 1306
07-16 75° 88° 5650 4167 2759 1813 1332
07-17 76° 93° 5713 4220 2801 1847 1361
07-18 73° 84° 5770 4267 2838 1876 1385
07-19 68° 80° 5822 4309 2871 1901 1405
07-20 75° 90° 5882 4359 2911 1933 1432
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 69° 87° 5939 4406 2947 1961 1455
07-22 65° 79° 5989 4446 2977 1983 1472
07-23 66° 81° 6040 4487 3009 2007 1491
07-24 67° 88° 6096 4533 3044 2034 1513
07-25 74° 96° 6159 4586 3087 2069 1543
07-26 74° 84° 6216 4633 3124 2098 1567
07-27 71° 84° 6271 4678 3160 2126 1590
07-28 74° 95° 6334 4731 3203 2161 1620
07-29 77° 99° 6400 4787 3248 2199 1653
07-30 79° 95° 6465 4842 3294 2236 1685
07-31 67° 90° 6522 4889 3330 2264 1708
08-01 63° 73° 6568 4925 3356 2282 1721
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 61° 80° 6616 4963 3385 2303 1737
08-03 62° 84° 6667 5004 3416 2326 1755
08-04 63° 89° 6721 5048 3450 2352 1776
08-05 68° 84° 6775 5092 3483 2378 1797
08-06 68° 78° 6826 5133 3514 2401 1815
08-07 65° 79° 6876 5173 3544 2422 1831
08-08 60° 80° 6924 5211 3573 2443 1847
08-09 59° 82° 6973 5250 3601 2464 1863
08-10 62° 88° 7026 5293 3635 2489 1883
08-11 66° 87° 7081 5338 3670 2516 1905
08-12 67° 88° 7136 5383 3705 2543 1927
08-13 73° 89° 7195 5432 3744 2574 1953
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 72° 88° 7254 5481 3782 2604 1978
08-15 74° 88° 7312 5529 3821 2635 2004
08-16 74° 82° 7369 5576 3857 2663 2027
08-17 71° 91° 7428 5625 3896 2694 2053
08-18 65° 77° 7477 5664 3925 2715 2069
08-19 63° 76° 7524 5701 3953 2735 2084
08-20 59° 69° 7566 5733 3975 2749 2093
08-21 59° 73° 7610 5767 3999 2765 2104
08-22 57° 84° 7659 5806 4028 2786 2120
08-23 62° 82° 7709 5846 4058 2808 2137
08-24 64° 79° 7759 5886 4087 2830 2154
08-25 69° 86° 7814 5931 4123 2857 2176
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 61° 79° 7862 5969 4151 2877 2191
08-27 59° 75° 7907 6004 4176 2894 2203
08-28 56° 77° 7952 6039 4201 2911 2215
08-29 63° 78° 8000 6077 4229 2931 2230
08-30 55° 76° 8044 6111 4252 2946 2240
08-31 55° 78° 8088 6145 4277 2963 2252
09-01 59° 78° 8135 6182 4303 2981 2265
09-02 59° 76° 8180 6217 4329 2999 2278
09-03 60° 77° 8227 6254 4355 3017 2291
09-04 60° 77° 8273 6290 4382 3036 2305
09-05 67° 84° 8327 6334 4415 3061 2325
09-06 67° 86° 8381 6378 4450 3088 2347
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 61° 70° 8424 6411 4473 3103 2357
09-08 55° 73° 8466 6443 4495 3117 2366
09-09 54° 73° 8508 6475 4516 3130 2374
09-10 61° 72° 8552 6509 4541 3147 2386
09-11 58° 80° 8600 6547 4568 3166 2400
09-12 60° 78° 8647 6584 4595 3185 2414
09-13 61° 76° 8693 6620 4622 3204 2428
09-14 62° 81° 8743 6660 4652 3226 2445
09-15 65° 79° 8793 6700 4682 3248 2462
09-16 63° 74° 8839 6736 4708 3266 2475
09-17 61° 68° 8882 6769 4731 3281 2485
09-18 66° 84° 8935 6812 4764 3306 2505
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 64° 84° 8987 6854 4796 3330 2524
09-20 59° 74° 9031 6888 4820 3346 2535
09-21 56° 70° 9072 6919 4841 3359 2543
09-22 54° 71° 9113 6950 4861 3371 2550
09-23 62° 83° 9163 6990 4892 3394 2568
09-24 68° 78° 9214 7031 4923 3417 2586
09-25 71° 78° 9266 7073 4955 3441 2605
09-26 67° 81° 9319 7116 4987 3465 2624
09-27 64° 78° 9367 7154 5016 3486 2640
09-28 65° 83° 9419 7196 5048 3510 2659
09-29 63° 78° 9468 7235 5077 3531 2675
09-30 62° 81° 9517 7274 5106 3552 2691
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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