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 Wed, Apr. 15. 2026

 

Forecasted GDD Total: 795 (Base 32) through Wed, Apr. 15, 2026

  

Cedar Rapids, IA

        

Forecast »

“Flashback” to 2025

4/7

4/8

4/9

4/10

4/11

4/12

4/13

4/14

4/15

4/16

4/17

4/18

4/19

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 29° 61° 23 13 3 0 0
02-16 35° 69° 53 33 13 2 0
02-17 37° 59° 79 49 19 2 0
02-18 40° 61° 108 68 28 2 0
02-19 23° 40° 118 68 28 2 0
02-20 18° 33° 122 68 28 2 0
02-21 14° 23° 122 68 28 2 0
02-22 8° 16° 122 68 28 2 0
02-23 9° 21° 122 68 28 2 0
02-24 13° 39° 126 68 28 2 0
02-25 21° 30° 129 68 28 2 0
02-26 25° 47° 143 72 28 2 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 26° 65° 167 85 31 2 0
02-28 24° 38° 176 85 31 2 0
03-01 18° 35° 180 85 31 2 0
03-02 24° 40° 190 85 31 2 0
03-03 35° 46° 208 94 31 2 0
03-04 30° 44° 223 99 31 2 0
03-05 39° 57° 249 115 37 2 0
03-06 47° 66° 284 139 52 9 2
03-07 30° 61° 307 153 55 9 2
03-08 30° 68° 334 170 62 9 2
03-09 45° 74° 372 197 80 18 6
03-10 39° 56° 397 213 85 18 6
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 32° 45° 414 219 85 18 6
03-12 24° 46° 427 223 85 18 6
03-13 35° 49° 447 233 85 18 6
03-14 31° 45° 463 239 85 18 6
03-15 29° 40° 476 241 85 18 6
03-16 9° 29° 476 241 85 18 6
03-17 4° 22° 476 241 85 18 6
03-18 21° 50° 489 245 85 18 6
03-19 32° 69° 518 264 94 19 6
03-20 45° 73° 555 291 112 29 10
03-21 47° 85° 600 325 136 45 22
03-22 38° 65° 629 345 145 46 22
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 28° 48° 645 351 145 46 22
03-24 35° 58° 670 365 150 46 22
03-25 39° 75° 705 390 165 53 24
03-26 43° 64° 737 412 177 57 24
03-27 27° 46° 752 417 177 57 24
03-28 19° 55° 767 422 177 57 24
03-29 40° 65° 797 443 187 60 24
03-30 45° 85° 841 476 211 75 34
03-31 53° 71° 880 506 231 87 41
04-01 38° 51° 903 518 233 87 41
04-02 37° 62° 931 536 241 87 41
04-03 38° 49° 953 548 243 87 41
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 39° 49° 975 560 245 87 41
04-05 33° 56° 997 573 248 87 41
04-06 35° 48° 1017 583 248 87 41
04-07 30° 44° 1032 588 248 87 41
04-08 38° 73° 1066 611 261 93 42
04-09 40° 59° 1093 629 269 93 42
04-10 42° 53° 1118 644 274 93 42
04-11 36° 52° 1141 656 276 93 42
04-12 51° 72° 1180 686 296 104 48
04-13 58° 76° 1226 721 321 122 61
04-14 63° 80° 1275 761 351 143 77
04-15 59° 74° 1320 795 375 160 89
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 56° 75° 1363 829 399 175 99
04-17 56° 81° 1410 865 425 194 113
04-18 44° 57° 1438 884 434 194 113
04-19 32° 54° 1459 895 435 194 113
04-20 36° 65° 1488 913 443 195 113
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 20° 27° 2 0 0 0 0
02-16 3° 22° 2 0 0 0 0
02-17 -5° 1° 2 0 0 0 0
02-18 -13° 5° 2 0 0 0 0
02-19 -4° 8° 2 0 0 0 0
02-20 -6° 17° 2 0 0 0 0
02-21 -12° 22° 2 0 0 0 0
02-22 7° 32° 2 0 0 0 0
02-23 20° 49° 14 3 0 0 0
02-24 37° 56° 39 17 4 0 0
02-25 31° 55° 60 28 5 0 0
02-26 35° 52° 81 40 7 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 31° 53° 101 49 7 0 0
02-28 31° 58° 123 62 9 0 0
03-01 19° 32° 127 62 9 0 0
03-02 13° 42° 132 62 9 0 0
03-03 29° 59° 154 74 11 0 0
03-04 44° 53° 180 90 18 0 0
03-05 27° 44° 194 93 18 0 0
03-06 20° 41° 202 93 18 0 0
03-07 31° 37° 214 95 18 0 0
03-08 24° 48° 228 99 18 0 0
03-09 29° 61° 251 112 21 0 0
03-10 33° 74° 282 133 32 3 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 38° 54° 306 148 36 3 0
03-12 29° 63° 330 162 40 3 0
03-13 34° 71° 361 182 51 6 0
03-14 54° 80° 406 217 76 23 12
03-15 31° 53° 426 228 76 23 12
03-16 26° 43° 439 230 76 23 12
03-17 24° 70° 464 245 81 23 12
03-18 35° 74° 497 268 94 28 12
03-19 34° 53° 518 280 96 28 12
03-20 28° 42° 532 283 96 28 12
03-21 31° 60° 556 297 100 28 12
03-22 23° 52° 571 302 100 28 12
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 36° 50° 592 313 100 28 12
03-24 30° 52° 611 322 100 28 12
03-25 40° 54° 636 337 106 28 12
03-26 31° 58° 658 350 108 28 12
03-27 42° 63° 689 370 119 30 12
03-28 49° 82° 733 404 142 46 23
03-29 60° 75° 778 439 168 63 35
03-30 37° 60° 804 456 174 63 35
03-31 32° 50° 823 465 174 63 35
04-01 31° 45° 839 471 174 63 35
04-02 43° 70° 874 495 189 70 37
04-03 37° 53° 897 509 192 70 37
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 32° 49° 916 517 192 70 37
04-05 37° 48° 937 528 192 70 37
04-06 24° 55° 954 536 192 70 37
04-07 33° 44° 971 542 192 70 37
04-08 21° 49° 984 545 192 70 37
04-09 39° 59° 1011 562 199 70 37
04-10 34° 59° 1036 577 204 70 37
04-11 40° 57° 1063 594 211 70 37
04-12 32° 65° 1089 611 217 70 37
04-13 50° 74° 1129 641 237 82 44
04-14 46° 61° 1161 662 249 86 44
04-15 42° 59° 1189 681 258 86 44
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 31° 66° 1216 697 264 86 44
04-17 53° 71° 1256 727 284 98 51
04-18 51° 69° 1294 755 302 108 56
04-19 43° 58° 1322 773 310 108 56
04-20 41° 51° 1346 787 314 108 56
04-21 43° 60° 1376 807 324 110 56
04-22 44° 71° 1411 832 339 117 58
04-23 56° 74° 1454 865 362 132 68
04-24 58° 72° 1497 898 385 147 78
04-25 51° 60° 1530 922 398 152 78
04-26 41° 63° 1560 942 409 155 78
04-27 45° 69° 1595 967 423 161 80
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 56° 78° 1641 1002 449 179 92
04-29 45° 73° 1678 1029 466 188 97
04-30 42° 66° 1710 1051 478 192 97
05-01 53° 63° 1746 1077 494 200 99
05-02 46° 56° 1774 1096 503 201 99
05-03 46° 57° 1804 1115 512 202 99
05-04 40° 71° 1838 1139 526 208 100
05-05 45° 69° 1873 1164 541 215 102
05-06 44° 77° 1911 1193 559 225 108
05-07 53° 81° 1957 1228 585 243 120
05-08 49° 72° 1995 1256 603 253 125
05-09 41° 73° 2030 1282 619 261 128
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 51° 83° 2075 1317 644 278 140
05-11 48° 80° 2118 1349 666 292 149
05-12 51° 84° 2163 1385 692 310 162
05-13 60° 82° 2212 1424 721 331 178
05-14 59° 84° 2262 1464 750 352 195
05-15 67° 88° 2318 1509 786 380 217
05-16 56° 79° 2363 1545 812 398 230
05-17 50° 66° 2399 1571 827 405 233
05-18 47° 73° 2437 1599 846 416 238
05-19 48° 64° 2472 1623 860 422 239
05-20 50° 63° 2506 1648 875 429 241
05-21 49° 55° 2536 1668 884 430 241
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 47° 63° 2569 1691 897 435 241
05-23 44° 69° 2604 1715 912 442 242
05-24 51° 68° 2641 1743 929 451 247
05-25 55° 69° 2681 1773 949 463 254
05-26 48° 70° 2718 1800 967 473 258
05-27 56° 72° 2761 1832 989 487 267
05-28 55° 66° 2799 1860 1007 497 273
05-29 54° 70° 2839 1890 1027 509 280
05-30 53° 79° 2883 1925 1051 525 291
05-31 55° 83° 2930 1962 1078 544 305
06-01 53° 78° 2974 1995 1102 560 315
06-02 55° 88° 3023 2035 1131 581 332
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 61° 77° 3070 2072 1158 600 346
06-04 56° 74° 3113 2105 1181 615 356
06-05 55° 79° 3158 2139 1206 632 368
06-06 63° 79° 3207 2178 1235 653 384
06-07 60° 76° 3253 2215 1261 671 397
06-08 57° 77° 3298 2250 1287 689 409
06-09 55° 70° 3339 2280 1307 701 417
06-10 50° 82° 3383 2314 1331 717 428
06-11 62° 94° 3439 2360 1367 745 451
06-12 65° 87° 3493 2404 1401 771 471
06-13 62° 83° 3543 2444 1431 793 489
06-14 63° 85° 3595 2487 1464 818 508
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 69° 79° 3648 2529 1496 842 527
06-16 68° 84° 3701 2573 1530 868 548
06-17 65° 87° 3756 2617 1564 894 569
06-18 68° 74° 3805 2656 1593 915 586
06-19 61° 86° 3856 2698 1624 938 604
06-20 68° 88° 3912 2744 1660 966 627
06-21 77° 94° 3976 2797 1704 1002 658
06-22 76° 93° 4038 2850 1746 1036 687
06-23 73° 93° 4099 2900 1787 1069 715
06-24 72° 82° 4154 2946 1822 1096 737
06-25 73° 88° 4213 2994 1861 1127 762
06-26 71° 89° 4271 3042 1899 1157 788
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 68° 80° 4323 3084 1931 1181 807
06-28 65° 89° 4378 3129 1966 1208 829
06-29 71° 86° 4435 3176 2003 1237 852
06-30 65° 84° 4487 3218 2035 1261 872
07-01 63° 85° 4539 3260 2067 1285 891
07-02 64° 86° 4592 3304 2100 1310 911
07-03 65° 90° 4648 3349 2136 1338 934
07-04 73° 91° 4708 3399 2176 1370 960
07-05 70° 86° 4764 3445 2212 1398 984
07-06 70° 86° 4820 3491 2248 1426 1006
07-07 68° 84° 4874 3535 2282 1452 1028
07-08 70° 83° 4928 3580 2316 1478 1049
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 66° 86° 4982 3623 2350 1504 1070
07-10 69° 85° 5037 3669 2385 1531 1092
07-11 66° 81° 5089 3710 2417 1555 1111
07-12 66° 82° 5140 3752 2449 1579 1129
07-13 59° 81° 5188 3790 2477 1599 1144
07-14 61° 85° 5240 3831 2508 1622 1163
07-15 64° 87° 5293 3875 2542 1648 1183
07-16 71° 81° 5348 3919 2576 1674 1205
07-17 60° 71° 5391 3953 2599 1689 1215
07-18 59° 79° 5438 3989 2626 1708 1229
07-19 67° 85° 5492 4033 2660 1734 1250
07-20 72° 83° 5547 4079 2695 1761 1272
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 67° 80° 5599 4120 2727 1785 1290
07-22 74° 87° 5657 4169 2766 1816 1316
07-23 77° 91° 5720 4221 2808 1850 1346
07-24 71° 82° 5774 4266 2842 1876 1367
07-25 69° 85° 5829 4310 2877 1903 1389
07-26 72° 85° 5885 4357 2914 1932 1412
07-27 70° 89° 5943 4405 2951 1961 1437
07-28 69° 88° 6000 4451 2988 1990 1460
07-29 68° 87° 6055 4497 3023 2017 1483
07-30 67° 77° 6106 4537 3054 2040 1501
07-31 62° 75° 6152 4574 3081 2059 1514
08-01 55° 76° 6196 4607 3104 2074 1524
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 58° 76° 6241 4642 3129 2091 1536
08-03 56° 78° 6285 4677 3154 2108 1548
08-04 59° 79° 6332 4714 3181 2127 1562
08-05 62° 82° 6382 4754 3211 2149 1579
08-06 61° 82° 6432 4793 3240 2170 1596
08-07 69° 85° 6486 4838 3275 2197 1617
08-08 70° 90° 6544 4886 3313 2227 1642
08-09 75° 86° 6603 4934 3351 2257 1668
08-10 71° 81° 6657 4978 3385 2283 1689
08-11 66° 82° 6709 5020 3417 2307 1707
08-12 69° 82° 6762 5064 3450 2332 1728
08-13 61° 80° 6811 5102 3479 2353 1743
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 61° 79° 6859 5140 3507 2373 1758
08-15 66° 89° 6914 5185 3542 2400 1781
08-16 69° 92° 6973 5234 3581 2431 1806
08-17 72° 90° 7032 5283 3620 2462 1833
08-18 71° 88° 7089 5331 3657 2491 1857
08-19 69° 83° 7143 5375 3691 2517 1878
08-20 67° 84° 7197 5418 3725 2543 1899
08-21 62° 79° 7245 5457 3753 2563 1914
08-22 61° 80° 7294 5495 3782 2584 1930
08-23 62° 74° 7340 5531 3808 2602 1942
08-24 52° 72° 7380 5561 3828 2614 1950
08-25 48° 70° 7417 5589 3845 2623 1954
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 47° 73° 7456 5617 3864 2634 1959
08-27 49° 73° 7495 5646 3883 2645 1965
08-28 57° 81° 7542 5683 3910 2664 1980
08-29 59° 80° 7589 5721 3937 2683 1994
08-30 62° 77° 7637 5758 3965 2703 2008
08-31 59° 77° 7683 5794 3991 2721 2022
09-01 56° 77° 7727 5829 4016 2738 2033
09-02 54° 79° 7772 5863 4040 2754 2044
09-03 54° 69° 7811 5893 4059 2765 2051
09-04 42° 68° 7844 5916 4072 2770 2051
09-05 49° 64° 7879 5940 4087 2777 2053
09-06 41° 65° 7910 5961 4098 2780 2053
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 41° 69° 7943 5984 4111 2785 2053
09-08 47° 76° 7982 6014 4130 2796 2059
09-09 52° 78° 8025 6046 4153 2811 2069
09-10 56° 82° 8072 6083 4180 2830 2083
09-11 56° 84° 8120 6121 4208 2850 2098
09-12 59° 89° 8172 6164 4240 2874 2117
09-13 69° 96° 8232 6214 4281 2907 2144
09-14 66° 94° 8290 6262 4318 2936 2169
09-15 68° 89° 8347 6308 4355 2965 2193
09-16 64° 90° 8402 6353 4390 2992 2215
09-17 62° 87° 8455 6396 4423 3017 2234
09-18 66° 77° 8504 6435 4452 3038 2251
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 64° 78° 8553 6475 4481 3059 2267
09-20 59° 74° 8597 6509 4505 3075 2278
09-21 58° 78° 8643 6545 4532 3094 2291
09-22 61° 83° 8693 6585 4561 3115 2308
09-23 59° 77° 8739 6621 4587 3133 2321
09-24 56° 77° 8784 6656 4612 3150 2333
09-25 49° 79° 8826 6687 4634 3164 2342
09-26 52° 88° 8874 6726 4662 3184 2357
09-27 56° 87° 8924 6765 4692 3206 2373
09-28 55° 87° 8973 6804 4721 3227 2389
09-29 56° 89° 9023 6845 4751 3249 2407
09-30 57° 88° 9074 6885 4782 3272 2425
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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