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Early Season Fungicide App for Dollar Spot Suppression (GDD 50)
forecast for Sun, Apr. 5. 2026

 

Forecasted GDD Total: 104 (Base 50) through Sun, Apr. 5, 2026

  

Crestwood, IL

        

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

201

Late

177

Target

140

Early

101

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 30° 62° 24 14 4 0 0
02-16 36° 66° 53 33 13 1 0
02-17 42° 59° 82 52 22 2 0
02-18 47° 64° 115 75 35 7 1
02-19 40° 58° 143 93 43 7 1
02-20 25° 48° 157 97 43 7 1
02-21 25° 30° 163 97 43 7 1
02-22 20° 27° 164 97 43 7 1
02-23 19° 29° 166 97 43 7 1
02-24 19° 39° 174 97 43 7 1
02-25 26° 38° 183 97 43 7 1
02-26 22° 43° 194 98 43 7 1
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 29° 65° 219 112 47 7 1
02-28 28° 49° 235 119 47 7 1
03-01 25° 33° 242 119 47 7 1
03-02 24° 45° 254 121 47 7 1
03-03 34° 44° 271 128 47 7 1
03-04 34° 45° 289 136 47 7 1
03-05 40° 51° 312 149 51 7 1
03-06 45° 77° 351 178 70 18 7
03-07 39° 64° 381 197 79 20 7
03-08 34° 63° 407 214 86 20 7
03-09 49° 73° 446 243 105 31 12
03-10 39° 64° 475 262 114 32 12
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 34° 52° 496 273 115 32 12
03-12 29° 45° 511 278 115 32 12
03-13 38° 47° 532 289 115 32 12
03-14 29° 36° 542 289 115 32 12
03-15 33° 66° 570 307 123 32 12
03-16 21° 33° 574 307 123 32 12
03-17 15° 24° 574 307 123 32 12
03-18 23° 48° 588 310 123 32 12
03-19 34° 64° 615 327 130 32 12
03-20 43° 75° 652 354 147 41 16
03-21 42° 71° 686 378 161 47 17
03-22 33° 70° 715 398 170 48 17
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 30° 41° 729 401 170 48 17
03-24 25° 53° 746 408 170 48 17
03-25 41° 72° 781 433 185 55 19
03-26 35° 77° 815 457 199 61 20
03-27 32° 42° 830 462 199 61 20
03-28 28° 48° 846 468 199 61 20
03-29 41° 63° 876 488 209 63 20
03-30 53° 81° 921 523 234 80 32
03-31 41° 71° 955 547 248 86 33
04-01 37° 42° 972 555 248 86 33
04-02 39° 71° 1006 578 261 91 33
04-03 50° 65° 1041 603 277 99 36
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 46° 64° 1074 627 290 104 36
04-05 36° 51° 1096 638 291 104 36
04-06 37° 52° 1118 651 294 104 36
04-07 31° 44° 1134 656 294 104 36
04-08 32° 61° 1158 671 298 104 36
04-09 49° 66° 1194 696 314 111 38
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 24° 34° 7 0 0 0 0
02-16 12° 30° 7 0 0 0 0
02-17 2° 12° 7 0 0 0 0
02-18 -6° 15° 7 0 0 0 0
02-19 5° 19° 7 0 0 0 0
02-20 5° 24° 7 0 0 0 0
02-21 9° 29° 7 0 0 0 0
02-22 14° 36° 11 0 0 0 0
02-23 22° 47° 23 3 0 0 0
02-24 38° 56° 49 18 5 0 0
02-25 36° 56° 73 32 9 0 0
02-26 34° 53° 94 44 11 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 35° 50° 114 54 11 0 0
02-28 32° 58° 138 67 14 0 0
03-01 19° 38° 145 67 14 0 0
03-02 15° 37° 149 67 14 0 0
03-03 26° 47° 163 72 14 0 0
03-04 43° 47° 186 85 18 0 0
03-05 29° 51° 205 93 18 0 0
03-06 27° 40° 216 94 18 0 0
03-07 32° 36° 228 96 18 0 0
03-08 30° 50° 246 104 18 0 0
03-09 31° 58° 269 117 20 0 0
03-10 38° 68° 300 138 32 3 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 36° 58° 325 153 36 3 0
03-12 35° 55° 348 166 40 3 0
03-13 33° 64° 374 183 46 3 0
03-14 46° 79° 415 213 67 16 8
03-15 45° 69° 450 239 82 23 10
03-16 30° 44° 465 243 82 23 10
03-17 25° 53° 482 250 82 23 10
03-18 46° 74° 519 278 100 33 15
03-19 38° 61° 547 295 107 33 15
03-20 31° 42° 562 300 107 33 15
03-21 30° 58° 584 312 110 33 15
03-22 35° 52° 605 324 111 33 15
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 34° 48° 624 332 111 33 15
03-24 34° 49° 644 342 111 33 15
03-25 28° 50° 661 349 111 33 15
03-26 28° 53° 679 358 111 33 15
03-27 41° 54° 705 373 117 33 15
03-28 48° 80° 747 405 139 47 24
03-29 56° 68° 787 436 159 59 31
03-30 47° 76° 827 465 179 71 38
03-31 35° 46° 845 473 179 71 38
04-01 31° 47° 862 480 179 71 38
04-02 40° 69° 895 503 192 76 38
04-03 43° 64° 926 525 203 79 38
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 39° 50° 949 537 205 79 38
04-05 41° 52° 973 551 210 79 38
04-06 35° 47° 992 560 210 79 38
04-07 30° 44° 1007 565 210 79 38
04-08 26° 43° 1020 568 210 79 38
04-09 32° 43° 1035 574 210 79 38
04-10 38° 46° 1056 584 210 79 38
04-11 36° 51° 1077 595 211 79 38
04-12 32° 62° 1102 610 216 79 38
04-13 52° 64° 1138 636 233 88 41
04-14 53° 64° 1174 663 249 96 45
04-15 40° 55° 1200 678 255 96 45
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 33° 52° 1220 689 255 96 45
04-17 38° 65° 1250 708 264 97 45
04-18 58° 78° 1296 744 291 116 58
04-19 43° 68° 1329 768 304 121 58
04-20 47° 65° 1364 792 318 127 60
04-21 49° 63° 1398 816 332 133 60
04-22 40° 74° 1433 841 347 140 63
04-23 55° 76° 1476 875 371 156 73
04-24 52° 79° 1520 908 394 171 83
04-25 47° 62° 1552 930 407 176 83
04-26 42° 52° 1578 946 412 176 83
04-27 35° 70° 1608 966 423 178 83
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 53° 84° 1654 1003 449 197 97
04-29 53° 77° 1698 1036 472 212 107
04-30 46° 64° 1731 1059 485 217 107
05-01 54° 69° 1770 1089 505 229 114
05-02 46° 60° 1801 1110 516 232 114
05-03 44° 54° 1829 1127 523 232 114
05-04 45° 55° 1857 1145 531 232 114
05-05 47° 62° 1889 1168 544 236 114
05-06 46° 77° 1928 1197 563 248 120
05-07 48° 76° 1968 1227 583 260 127
05-08 45° 58° 1998 1247 593 261 127
05-09 38° 65° 2027 1266 602 263 127
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 44° 76° 2065 1294 620 273 132
05-11 43° 73° 2101 1320 636 280 135
05-12 50° 79° 2144 1352 658 295 144
05-13 62° 78° 2192 1390 687 315 160
05-14 58° 78° 2238 1427 713 333 173
05-15 63° 94° 2294 1473 749 362 196
05-16 62° 87° 2347 1515 782 386 216
05-17 54° 70° 2387 1545 801 398 222
05-18 47° 64° 2420 1569 815 404 223
05-19 45° 53° 2447 1586 822 404 223
05-20 50° 58° 2480 1608 834 408 223
05-21 50° 54° 2509 1628 844 410 223
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 48° 56° 2540 1648 854 412 223
05-23 42° 63° 2570 1669 865 414 223
05-24 42° 66° 2602 1691 877 418 223
05-25 51° 65° 2638 1717 893 426 226
05-26 44° 68° 2672 1741 907 432 227
05-27 53° 67° 2710 1769 925 442 232
05-28 55° 63° 2747 1796 942 451 236
05-29 52° 70° 2786 1825 961 462 242
05-30 52° 74° 2827 1856 982 475 250
05-31 50° 65° 2863 1881 997 483 253
06-01 42° 68° 2896 1904 1011 488 253
06-02 46° 85° 2939 1937 1034 503 263
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 67° 89° 2995 1983 1070 531 286
06-04 59° 76° 3040 2019 1095 549 298
06-05 55° 69° 3080 2049 1115 560 305
06-06 61° 78° 3128 2086 1143 580 320
06-07 57° 79° 3174 2122 1169 598 333
06-08 59° 81° 3222 2160 1197 618 348
06-09 54° 73° 3264 2192 1219 632 357
06-10 54° 79° 3308 2227 1243 648 368
06-11 63° 91° 3364 2272 1278 676 391
06-12 66° 84° 3417 2315 1311 701 411
06-13 62° 73° 3463 2351 1337 719 423
06-14 64° 75° 3510 2388 1365 738 438
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 59° 82° 3559 2427 1393 759 453
06-16 62° 88° 3612 2470 1426 784 474
06-17 72° 91° 3671 2519 1466 815 500
06-18 68° 83° 3725 2563 1499 841 520
06-19 66° 82° 3776 2605 1531 865 539
06-20 67° 84° 3830 2649 1565 890 560
06-21 76° 94° 3894 2702 1608 926 590
06-22 79° 94° 3958 2757 1653 962 622
06-23 78° 95° 4022 2811 1697 999 653
06-24 77° 94° 4086 2864 1741 1034 684
06-25 72° 87° 4144 2912 1778 1064 709
06-26 76° 94° 4207 2965 1821 1099 738
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 77° 88° 4267 3016 1862 1132 766
06-28 68° 89° 4324 3062 1899 1160 790
06-29 73° 92° 4384 3113 1939 1192 817
06-30 75° 90° 4444 3163 1979 1224 844
07-01 71° 87° 4501 3209 2016 1253 868
07-02 68° 89° 4558 3256 2053 1282 892
07-03 70° 92° 4617 3305 2092 1313 918
07-04 74° 90° 4677 3356 2132 1345 945
07-05 74° 93° 4739 3407 2173 1379 973
07-06 70° 86° 4795 3453 2210 1407 997
07-07 66° 83° 4847 3496 2242 1431 1016
07-08 67° 86° 4902 3540 2276 1458 1037
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 69° 83° 4956 3584 2310 1484 1058
07-10 67° 86° 5010 3628 2345 1510 1080
07-11 70° 90° 5068 3676 2383 1540 1105
07-12 71° 81° 5122 3720 2417 1566 1126
07-13 68° 82° 5175 3763 2450 1591 1146
07-14 61° 87° 5227 3805 2482 1615 1165
07-15 68° 92° 5285 3853 2519 1645 1189
07-16 73° 91° 5345 3903 2559 1677 1216
07-17 64° 76° 5393 3941 2588 1697 1232
07-18 59° 83° 5442 3980 2616 1718 1247
07-19 72° 82° 5497 4025 2652 1745 1270
07-20 68° 75° 5547 4065 2681 1767 1286
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 64° 83° 5598 4107 2713 1790 1305
07-22 66° 87° 5653 4151 2747 1817 1327
07-23 70° 93° 5712 4201 2787 1848 1353
07-24 71° 94° 5773 4251 2828 1881 1381
07-25 74° 83° 5829 4298 2864 1909 1404
07-26 72° 82° 5885 4343 2899 1937 1426
07-27 74° 88° 5943 4392 2938 1967 1452
07-28 77° 89° 6004 4443 2979 2000 1480
07-29 70° 91° 6063 4491 3018 2031 1506
07-30 70° 82° 6117 4536 3052 2057 1527
07-31 66° 75° 6166 4574 3080 2078 1542
08-01 61° 76° 6212 4610 3107 2096 1556
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 57° 79° 6258 4646 3132 2114 1569
08-03 58° 79° 6304 4683 3159 2132 1582
08-04 61° 82° 6354 4722 3189 2154 1599
08-05 62° 84° 6405 4763 3219 2177 1616
08-06 64° 87° 6458 4807 3253 2202 1637
08-07 71° 89° 6516 4855 3291 2233 1662
08-08 72° 91° 6576 4904 3331 2264 1689
08-09 73° 92° 6637 4955 3371 2297 1716
08-10 76° 90° 6698 5006 3412 2330 1744
08-11 74° 88° 6757 5055 3451 2361 1770
08-12 72° 86° 6814 5102 3489 2390 1795
08-13 69° 83° 6868 5146 3522 2416 1816
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 65° 84° 6920 5189 3555 2440 1835
08-15 66° 91° 6977 5235 3591 2469 1858
08-16 75° 95° 7040 5288 3634 2504 1888
08-17 70° 82° 7094 5332 3669 2530 1910
08-18 71° 85° 7150 5378 3705 2558 1933
08-19 70° 78° 7202 5420 3737 2582 1952
08-20 68° 75° 7251 5460 3766 2603 1968
08-21 62° 74° 7298 5496 3792 2622 1981
08-22 62° 79° 7346 5534 3821 2642 1997
08-23 65° 83° 7398 5576 3853 2666 2016
08-24 56° 72° 7440 5608 3875 2680 2025
08-25 53° 68° 7479 5637 3893 2691 2031
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 51° 72° 7518 5667 3913 2702 2037
08-27 50° 75° 7559 5697 3934 2715 2045
08-28 61° 76° 7605 5734 3960 2733 2058
08-29 53° 70° 7645 5763 3979 2745 2064
08-30 59° 73° 7689 5797 4003 2761 2075
08-31 52° 75° 7730 5829 4025 2775 2084
09-01 55° 77° 7774 5863 4049 2790 2095
09-02 56° 80° 7820 5899 4075 2808 2108
09-03 58° 72° 7863 5932 4098 2824 2118
09-04 49° 66° 7899 5957 4113 2831 2121
09-05 55° 68° 7938 5987 4133 2842 2127
09-06 46° 66° 7972 6010 4147 2848 2128
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 44° 67° 8006 6034 4160 2854 2128
09-08 44° 72° 8042 6060 4176 2862 2131
09-09 46° 76° 8080 6089 4195 2873 2137
09-10 58° 82° 8129 6127 4223 2893 2152
09-11 63° 80° 8178 6167 4253 2914 2169
09-12 58° 84° 8227 6206 4282 2936 2185
09-13 64° 77° 8276 6244 4311 2956 2201
09-14 63° 83° 8327 6285 4342 2979 2219
09-15 61° 85° 8378 6326 4372 3002 2237
09-16 59° 82° 8426 6365 4401 3022 2252
09-17 57° 84° 8475 6403 4429 3043 2268
09-18 58° 87° 8526 6444 4460 3066 2285
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 63° 89° 8580 6488 4495 3092 2307
09-20 66° 79° 8630 6529 4525 3114 2324
09-21 65° 82° 8682 6570 4556 3138 2342
09-22 65° 81° 8733 6611 4587 3161 2361
09-23 65° 76° 8781 6650 4616 3182 2376
09-24 62° 72° 8827 6685 4641 3199 2388
09-25 60° 74° 8871 6720 4666 3215 2400
09-26 55° 82° 8918 6756 4692 3234 2414
09-27 60° 86° 8969 6797 4723 3257 2432
09-28 60° 81° 9017 6836 4752 3277 2447
09-29 59° 89° 9069 6877 4784 3301 2466
09-30 60° 82° 9118 6917 4813 3322 2482
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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