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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Crabgrass/Annual Bluegrass Preemergence Timer (GDD 32)
forecast for Thu, Apr. 16. 2026

 

Forecasted GDD Total: 1117 (Base 32) through Thu, Apr. 16, 2026

  

MD

        

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

Done

801

Late

500

Optimum

250

Early

171

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 35° 45° 18 8 0 0 0
02-16 35° 40° 34 14 0 0 0
02-17 35° 48° 53 23 0 0 0
02-18 36° 46° 72 32 0 0 0
02-19 37° 40° 89 39 0 0 0
02-20 37° 51° 111 51 2 0 0
02-21 37° 51° 133 63 4 0 0
02-22 32° 38° 146 66 4 0 0
02-23 30° 38° 158 68 4 0 0
02-24 22° 36° 165 68 4 0 0
02-25 32° 51° 185 77 4 0 0
02-26 37° 49° 206 88 5 0 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 28° 53° 224 97 5 0 0
02-28 32° 62° 249 112 10 0 0
03-01 33° 51° 269 121 10 0 0
03-02 28° 32° 277 121 10 0 0
03-03 29° 39° 288 123 10 0 0
03-04 40° 48° 310 135 11 0 0
03-05 43° 54° 337 152 18 0 0
03-06 42° 49° 360 165 21 0 0
03-07 39° 54° 384 179 26 0 0
03-08 49° 70° 422 207 44 10 5
03-09 42° 74° 458 233 60 18 8
03-10 46° 83° 500 265 82 32 17
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 56° 83° 548 303 109 52 32
03-12 33° 70° 578 322 119 53 32
03-13 28° 52° 596 331 119 53 32
03-14 44° 57° 624 349 127 54 32
03-15 39° 51° 647 362 131 54 32
03-16 35° 65° 675 380 139 54 32
03-17 29° 37° 687 381 139 54 32
03-18 22° 38° 695 381 139 54 32
03-19 33° 55° 717 393 141 54 32
03-20 36° 68° 747 414 151 56 32
03-21 49° 67° 782 439 166 63 34
03-22 46° 79° 823 470 187 76 42
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 42° 63° 854 491 198 79 42
03-24 30° 50° 872 499 198 79 42
03-25 37° 57° 897 514 203 79 42
03-26 49° 79° 939 546 225 92 51
03-27 38° 72° 972 569 238 97 51
03-28 32° 48° 990 577 238 97 51
03-29 30° 60° 1013 590 240 97 51
03-30 51° 69° 1051 618 259 108 56
03-31 60° 81° 1100 657 287 129 72
04-01 65° 85° 1153 700 321 154 92
04-02 45° 65° 1186 723 334 159 92
04-03 44° 78° 1225 752 353 170 99
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 62° 83° 1276 793 384 193 116
04-05 50° 71° 1314 821 402 203 121
04-06 42° 59° 1343 839 410 203 121
04-07 40° 53° 1367 854 415 203 121
04-08 30° 51° 1385 862 415 203 121
04-09 31° 59° 1408 875 418 203 121
04-10 40° 73° 1443 900 433 210 123
04-11 52° 66° 1480 927 450 219 127
04-12 44° 69° 1515 952 464 226 129
04-13 54° 81° 1560 987 490 243 141
04-14 61° 85° 1612 1028 521 267 159
04-15 63° 90° 1666 1073 556 293 181
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 66° 86° 1720 1117 590 319 202
04-17 62° 82° 1771 1157 620 342 219
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 30° 36° 11 1 0 0 0
02-16 34° 56° 35 15 3 0 0
02-17 28° 37° 46 16 3 0 0
02-18 18° 30° 48 16 3 0 0
02-19 16° 26° 48 16 3 0 0
02-20 18° 26° 48 16 3 0 0
02-21 23° 36° 55 16 3 0 0
02-22 18° 40° 62 16 3 0 0
02-23 27° 49° 78 22 3 0 0
02-24 31° 54° 99 32 4 0 0
02-25 36° 63° 126 50 11 0 0
02-26 36° 63° 154 67 19 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 44° 59° 183 86 28 1 0
02-28 41° 53° 208 102 33 1 0
03-01 27° 61° 230 114 35 1 0
03-02 18° 36° 236 114 35 1 0
03-03 23° 42° 246 114 35 1 0
03-04 31° 62° 270 129 40 1 0
03-05 51° 57° 302 151 52 5 0
03-06 35° 52° 324 162 53 5 0
03-07 33° 53° 345 173 54 5 0
03-08 35° 48° 364 182 54 5 0
03-09 30° 58° 386 194 56 5 0
03-10 37° 65° 415 213 65 6 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 37° 71° 446 235 76 10 0
03-12 44° 62° 477 256 87 13 0
03-13 41° 51° 501 269 91 13 0
03-14 38° 49° 522 281 92 13 0
03-15 43° 55° 549 298 99 13 0
03-16 51° 69° 587 326 117 23 5
03-17 38° 56° 612 341 122 23 5
03-18 35° 65° 640 358 130 23 5
03-19 38° 70° 672 381 142 27 5
03-20 45° 72° 709 407 159 36 8
03-21 37° 55° 732 421 162 36 8
03-22 39° 63° 762 440 171 37 8
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 33° 54° 783 451 173 37 8
03-24 44° 58° 812 470 182 38 8
03-25 46° 61° 844 492 194 41 8
03-26 37° 49° 865 503 195 41 8
03-27 29° 56° 885 514 195 41 8
03-28 40° 66° 916 534 206 44 8
03-29 56° 81° 962 571 232 62 22
03-30 59° 80° 1010 608 260 82 37
03-31 61° 82° 1060 648 290 104 53
04-01 42° 61° 1089 667 299 105 53
04-02 38° 55° 1114 682 304 105 53
04-03 50° 76° 1155 713 325 118 62
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 63° 72° 1201 749 350 136 74
04-05 58° 69° 1242 780 372 149 82
04-06 51° 58° 1275 803 385 154 82
04-07 41° 50° 1298 817 388 154 82
04-08 34° 46° 1317 825 388 154 82
04-09 28° 52° 1335 833 388 154 82
04-10 41° 55° 1361 849 394 154 82
04-11 44° 47° 1384 862 398 154 82
04-12 41° 50° 1408 876 401 154 82
04-13 43° 60° 1437 896 411 156 82
04-14 45° 72° 1474 923 428 165 86
04-15 49° 66° 1510 948 444 173 89
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 45° 58° 1540 968 453 174 89
04-17 36° 62° 1567 985 460 174 89
04-18 42° 78° 1604 1013 478 184 94
04-19 67° 79° 1656 1054 509 207 112
04-20 58° 72° 1699 1087 532 222 122
04-21 55° 71° 1740 1118 553 235 130
04-22 58° 77° 1785 1153 579 252 142
04-23 50° 76° 1826 1184 599 265 150
04-24 50° 77° 1868 1216 621 279 159
04-25 51° 75° 1909 1247 642 292 167
04-26 52° 73° 1950 1278 663 305 175
04-27 47° 69° 1985 1304 679 313 178
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 42° 73° 2021 1330 695 321 181
04-29 51° 82° 2066 1364 719 337 192
04-30 65° 81° 2117 1405 750 360 210
05-01 57° 81° 2164 1442 777 379 224
05-02 66° 83° 2216 1485 810 404 244
05-03 63° 82° 2267 1525 840 426 261
05-04 62° 72° 2312 1560 865 443 273
05-05 63° 72° 2357 1596 891 461 286
05-06 60° 70° 2400 1629 914 476 296
05-07 55° 71° 2442 1660 935 489 304
05-08 54° 77° 2485 1693 959 504 314
05-09 48° 64° 2519 1717 973 510 316
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 46° 73° 2557 1745 990 520 320
05-11 53° 81° 2602 1780 1015 537 332
05-12 55° 79° 2647 1815 1040 554 344
05-13 63° 67° 2690 1848 1064 569 354
05-14 60° 67° 2732 1880 1085 583 363
05-15 63° 78° 2780 1919 1114 604 379
05-16 66° 85° 2834 1962 1147 629 399
05-17 65° 85° 2887 2005 1180 654 419
05-18 64° 75° 2934 2043 1208 674 434
05-19 58° 73° 2978 2076 1232 689 444
05-20 51° 69° 3016 2104 1249 699 449
05-21 53° 60° 3050 2128 1264 705 450
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 53° 64° 3086 2155 1280 714 454
05-23 53° 64° 3123 2182 1297 723 458
05-24 49° 68° 3160 2208 1314 731 461
05-25 48° 70° 3197 2235 1331 740 465
05-26 57° 73° 3240 2268 1354 755 475
05-27 51° 70° 3278 2297 1372 766 481
05-28 50° 57° 3310 2318 1384 769 481
05-29 55° 73° 3352 2351 1406 784 490
05-30 61° 77° 3399 2388 1433 803 504
05-31 53° 68° 3438 2416 1452 813 510
06-01 46° 68° 3473 2442 1467 821 512
06-02 46° 73° 3511 2469 1485 830 517
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 53° 80° 3555 2504 1509 847 528
06-04 57° 87° 3605 2544 1539 869 545
06-05 65° 86° 3659 2587 1572 894 566
06-06 65° 85° 3712 2630 1605 919 586
06-07 68° 83° 3766 2674 1639 945 606
06-08 66° 73° 3813 2711 1667 964 621
06-09 66° 81° 3864 2753 1698 988 639
06-10 71° 84° 3920 2798 1733 1015 662
06-11 64° 84° 3972 2840 1765 1039 680
06-12 65° 90° 4027 2886 1801 1067 703
06-13 69° 88° 4084 2932 1837 1095 726
06-14 69° 81° 4137 2975 1870 1120 747
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 62° 68° 4180 3008 1893 1135 757
06-16 60° 66° 4221 3039 1914 1148 765
06-17 65° 75° 4268 3077 1942 1168 779
06-18 71° 83° 4323 3122 1977 1195 801
06-19 70° 89° 4381 3169 2015 1224 826
06-20 63° 84° 4433 3211 2046 1248 845
06-21 68° 89° 4489 3257 2083 1276 868
06-22 73° 92° 4550 3308 2123 1309 895
06-23 77° 97° 4614 3363 2168 1346 927
06-24 78° 98° 4680 3418 2214 1383 960
06-25 76° 96° 4744 3472 2258 1419 991
06-26 73° 94° 4806 3524 2299 1453 1020
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 65° 74° 4853 3562 2327 1473 1034
06-28 67° 89° 4909 3608 2363 1501 1057
06-29 72° 90° 4968 3656 2401 1531 1083
06-30 75° 90° 5028 3707 2442 1564 1110
07-01 73° 90° 5088 3756 2481 1595 1137
07-02 70° 86° 5144 3802 2517 1623 1160
07-03 69° 88° 5201 3849 2554 1652 1184
07-04 65° 85° 5254 3892 2587 1677 1203
07-05 63° 87° 5307 3935 2620 1702 1223
07-06 65° 86° 5360 3979 2654 1728 1244
07-07 75° 90° 5421 4029 2695 1760 1272
07-08 74° 93° 5483 4081 2736 1794 1301
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 72° 89° 5541 4129 2775 1824 1326
07-10 72° 83° 5597 4175 2810 1852 1349
07-11 71° 88° 5654 4223 2848 1882 1373
07-12 74° 87° 5713 4271 2886 1912 1399
07-13 76° 84° 5771 4319 2924 1942 1423
07-14 73° 87° 5829 4367 2962 1972 1448
07-15 72° 87° 5886 4414 3000 2001 1473
07-16 73° 87° 5944 4462 3037 2031 1498
07-17 72° 92° 6004 4512 3078 2063 1525
07-18 76° 84° 6062 4561 3116 2094 1550
07-19 73° 84° 6119 4607 3153 2122 1574
07-20 72° 88° 6177 4655 3191 2152 1599
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 72° 85° 6233 4701 3227 2180 1622
07-22 64° 84° 6285 4743 3259 2204 1641
07-23 69° 84° 6340 4788 3293 2231 1663
07-24 70° 88° 6397 4835 3330 2260 1686
07-25 73° 93° 6458 4886 3371 2293 1714
07-26 75° 89° 6517 4936 3411 2325 1741
07-27 75° 87° 6577 4985 3450 2356 1767
07-28 74° 93° 6638 5036 3492 2389 1796
07-29 73° 94° 6699 5088 3533 2423 1824
07-30 75° 94° 6762 5140 3575 2457 1853
07-31 74° 88° 6820 5189 3614 2488 1879
08-01 65° 73° 6867 5226 3641 2507 1893
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 62° 78° 6915 5264 3669 2527 1908
08-03 58° 80° 6962 5301 3696 2546 1922
08-04 59° 84° 7012 5340 3726 2567 1939
08-05 65° 81° 7063 5381 3757 2590 1957
08-06 69° 76° 7113 5422 3787 2613 1974
08-07 64° 80° 7163 5462 3817 2635 1991
08-08 63° 79° 7212 5501 3846 2656 2007
08-09 60° 81° 7261 5539 3874 2676 2023
08-10 57° 83° 7309 5577 3903 2696 2038
08-11 63° 85° 7361 5620 3935 2721 2057
08-12 71° 88° 7419 5667 3972 2750 2081
08-13 73° 86° 7476 5715 4010 2780 2106
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 72° 87° 7534 5762 4047 2809 2130
08-15 72° 88° 7591 5809 4085 2838 2155
08-16 74° 87° 7650 5858 4124 2869 2181
08-17 72° 93° 7710 5909 4164 2902 2208
08-18 67° 75° 7759 5947 4193 2922 2224
08-19 65° 72° 7805 5984 4219 2941 2237
08-20 65° 77° 7854 6023 4248 2962 2253
08-21 63° 71° 7899 6057 4273 2978 2265
08-22 64° 81° 7949 6098 4303 3001 2282
08-23 59° 81° 7997 6136 4331 3021 2297
08-24 65° 81° 8048 6176 4362 3043 2315
08-25 65° 81° 8099 6218 4393 3067 2333
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 56° 77° 8144 6252 4418 3083 2345
08-27 55° 75° 8187 6285 4440 3098 2355
08-28 53° 78° 8231 6319 4464 3114 2366
08-29 58° 78° 8277 6355 4490 3132 2379
08-30 50° 74° 8317 6385 4511 3144 2386
08-31 51° 76° 8359 6417 4532 3158 2394
09-01 54° 78° 8402 6451 4556 3174 2405
09-02 54° 76° 8445 6484 4579 3189 2415
09-03 53° 80° 8490 6518 4604 3205 2427
09-04 60° 83° 8540 6558 4633 3227 2444
09-05 62° 86° 8592 6600 4665 3251 2463
09-06 67° 88° 8648 6646 4701 3279 2485
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 59° 75° 8692 6681 4726 3296 2497
09-08 51° 73° 8733 6711 4746 3308 2504
09-09 51° 74° 8773 6741 4766 3320 2512
09-10 59° 69° 8815 6773 4789 3334 2521
09-11 63° 77° 8863 6811 4816 3354 2536
09-12 58° 79° 8909 6848 4843 3373 2549
09-13 55° 82° 8956 6884 4870 3391 2563
09-14 61° 84° 9007 6925 4900 3414 2580
09-15 61° 80° 9055 6963 4929 3434 2596
09-16 59° 69° 9097 6996 4951 3449 2605
09-17 59° 66° 9138 7026 4971 3461 2613
09-18 62° 83° 9188 7066 5002 3483 2630
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 60° 87° 9240 7108 5033 3507 2649
09-20 63° 73° 9286 7144 5060 3525 2662
09-21 64° 70° 9331 7179 5085 3542 2674
09-22 59° 78° 9378 7216 5111 3561 2688
09-23 62° 82° 9427 7256 5141 3583 2704
09-24 64° 76° 9475 7294 5169 3603 2719
09-25 69° 79° 9527 7336 5201 3627 2738
09-26 66° 82° 9579 7377 5233 3650 2757
09-27 64° 75° 9627 7415 5261 3670 2772
09-28 63° 84° 9679 7457 5292 3694 2790
09-29 63° 77° 9727 7495 5320 3714 2805
09-30 65° 76° 9775 7534 5349 3735 2821
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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