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Ester/Amine Spring Broadleaf Herbicide Timer - Purdue (GDD 50)
forecast for Sun, Apr. 12. 2026

 

Forecasted GDD Total: 228 (Base 50) through Sun, Apr. 12, 2026

  

Urbana, OH

        

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

Over

601

Amine

201

Ester or Amine

151

Ester

110

Early

71

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 32° 47° 18 8 0 0 0
02-16 32° 47° 35 15 0 0 0
02-17 34° 55° 57 27 2 0 0
02-18 48° 64° 91 51 16 6 1
02-19 49° 62° 124 74 30 12 2
02-20 33° 52° 145 85 30 12 2
02-21 28° 35° 154 85 30 12 2
02-22 23° 29° 158 85 30 12 2
02-23 20° 25° 159 85 30 12 2
02-24 19° 34° 164 85 30 12 2
02-25 31° 49° 182 93 30 12 2
02-26 27° 44° 195 96 30 12 2
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 32° 56° 217 109 32 12 2
02-28 37° 55° 241 123 37 12 2
03-01 26° 36° 250 123 37 12 2
03-02 22° 33° 256 123 37 12 2
03-03 31° 47° 273 130 37 12 2
03-04 39° 53° 297 144 41 12 2
03-05 53° 61° 332 169 56 19 4
03-06 56° 73° 375 202 78 34 14
03-07 57° 68° 415 232 99 46 21
03-08 40° 56° 441 248 105 46 21
03-09 41° 68° 473 271 117 50 21
03-10 59° 73° 517 305 141 66 32
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 35° 68° 547 324 150 67 32
03-12 30° 45° 562 329 150 67 32
03-13 36° 57° 587 344 155 67 32
03-14 29° 45° 602 349 155 67 32
03-15 39° 72° 635 372 169 73 32
03-16 25° 66° 659 386 172 73 32
03-17 18° 25° 659 386 172 73 32
03-18 18° 38° 665 386 172 73 32
03-19 34° 64° 691 403 179 73 32
03-20 48° 70° 728 430 196 82 36
03-21 37° 63° 756 448 204 82 36
03-22 41° 83° 796 478 224 93 43
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 31° 39° 809 481 224 93 43
03-24 24° 47° 823 485 224 93 43
03-25 38° 64° 852 503 233 94 43
03-26 47° 79° 893 535 254 107 51
03-27 32° 49° 911 543 254 107 51
03-28 28° 43° 925 546 254 107 51
03-29 33° 62° 951 562 259 107 51
03-30 55° 72° 992 594 281 121 60
03-31 60° 76° 1039 630 308 140 73
04-01 39° 68° 1070 652 319 143 73
04-02 39° 78° 1107 678 336 152 77
04-03 66° 77° 1156 718 365 173 93
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 52° 79° 1200 751 388 188 103
04-05 37° 49° 1221 762 390 188 103
04-06 33° 55° 1243 774 392 188 103
04-07 29° 41° 1256 777 392 188 103
04-08 29° 63° 1280 791 396 188 103
04-09 49° 75° 1320 821 416 200 110
04-10 51° 70° 1358 850 434 211 116
04-11 43° 61° 1388 870 444 213 116
04-12 48° 81° 1431 903 467 228 125
04-13 64° 76° 1479 941 495 248 140
04-14 62° 80° 1528 980 524 269 157
04-15 65° 80° 1579 1020 555 291 174
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 59° 77° 1625 1056 581 309 187
04-17 58° 80° 1672 1093 608 328 201
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 29° 39° 12 2 0 0 0
02-16 25° 37° 21 2 0 0 0
02-17 7° 24° 21 2 0 0 0
02-18 3° 15° 21 2 0 0 0
02-19 11° 18° 21 2 0 0 0
02-20 11° 19° 21 2 0 0 0
02-21 15° 26° 21 2 0 0 0
02-22 13° 31° 21 2 0 0 0
02-23 19° 40° 28 2 0 0 0
02-24 32° 48° 46 9 0 0 0
02-25 34° 55° 69 22 3 0 0
02-26 28° 51° 86 30 3 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 35° 50° 107 40 3 0 0
02-28 30° 56° 128 51 4 0 0
03-01 20° 45° 139 52 4 0 0
03-02 16° 30° 140 52 4 0 0
03-03 19° 39° 147 52 4 0 0
03-04 36° 63° 175 70 12 0 0
03-05 34° 55° 197 82 14 0 0
03-06 30° 35° 207 83 14 0 0
03-07 28° 41° 220 85 14 0 0
03-08 30° 41° 233 89 14 0 0
03-09 31° 55° 255 100 16 0 0
03-10 36° 63° 282 118 23 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 43° 70° 316 142 37 6 1
03-12 35° 67° 345 161 46 7 1
03-13 33° 70° 375 180 56 9 1
03-14 45° 75° 413 208 74 19 6
03-15 56° 68° 453 238 94 31 13
03-16 36° 59° 478 254 99 31 13
03-17 30° 47° 494 260 99 31 13
03-18 36° 68° 525 280 109 33 13
03-19 53° 66° 562 308 127 42 17
03-20 33° 58° 585 321 130 42 17
03-21 28° 50° 602 328 130 42 17
03-22 34° 48° 621 337 130 42 17
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 27° 42° 634 339 130 42 17
03-24 35° 51° 655 350 131 42 17
03-25 33° 50° 674 360 131 42 17
03-26 26° 48° 690 365 131 42 17
03-27 34° 58° 714 379 135 42 17
03-28 45° 76° 752 408 153 53 23
03-29 62° 75° 798 444 180 71 36
03-30 55° 69° 839 474 200 83 43
03-31 39° 55° 864 489 205 83 43
04-01 34° 50° 884 499 205 83 43
04-02 39° 77° 920 525 221 91 46
04-03 51° 70° 958 554 239 102 52
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 46° 54° 986 572 248 102 52
04-05 45° 62° 1018 594 259 106 52
04-06 34° 45° 1036 601 259 106 52
04-07 29° 52° 1054 610 259 106 52
04-08 23° 38° 1063 610 259 106 52
04-09 26° 45° 1076 613 259 106 52
04-10 39° 53° 1100 627 263 106 52
04-11 33° 41° 1115 632 263 106 52
04-12 28° 52° 1133 640 263 106 52
04-13 33° 58° 1157 653 267 106 52
04-14 49° 72° 1195 682 285 116 57
04-15 40° 54° 1220 697 290 116 57
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 34° 51° 1240 707 291 116 57
04-17 33° 62° 1266 723 296 116 57
04-18 53° 80° 1311 758 321 132 69
04-19 56° 74° 1354 790 344 147 79
04-20 47° 69° 1390 817 360 155 82
04-21 52° 73° 1430 847 381 168 89
04-22 44° 68° 1465 872 395 174 91
04-23 48° 77° 1506 902 416 187 99
04-24 53° 82° 1551 938 442 205 111
04-25 62° 72° 1596 973 466 222 123
04-26 46° 64° 1629 996 479 227 123
04-27 38° 63° 1658 1015 488 228 123
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 46° 77° 1698 1044 508 239 130
04-29 64° 77° 1746 1083 536 260 146
04-30 47° 71° 1783 1110 553 269 149
05-01 60° 75° 1829 1145 579 286 162
05-02 59° 73° 1872 1179 603 302 173
05-03 46° 62° 1905 1201 615 306 173
05-04 45° 59° 1935 1221 625 308 173
05-05 47° 59° 1966 1242 636 311 173
05-06 49° 63° 2000 1266 650 317 174
05-07 50° 70° 2038 1294 668 327 179
05-08 46° 63° 2070 1317 680 332 179
05-09 40° 60° 2098 1335 689 332 179
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 41° 73° 2133 1360 703 339 181
05-11 48° 76° 2174 1390 724 351 188
05-12 54° 73° 2215 1422 746 365 197
05-13 60° 72° 2260 1456 770 381 208
05-14 59° 71° 2303 1490 793 397 218
05-15 61° 82° 2353 1529 823 418 235
05-16 60° 79° 2400 1567 850 438 249
05-17 58° 67° 2441 1597 871 450 257
05-18 55° 69° 2480 1627 891 462 264
05-19 48° 69° 2517 1654 907 471 267
05-20 48° 58° 2548 1675 918 473 267
05-21 52° 65° 2584 1701 934 482 270
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 49° 54° 2614 1720 944 483 270
05-23 41° 59° 2642 1738 952 483 270
05-24 42° 63° 2672 1759 962 486 270
05-25 45° 63° 2704 1781 974 490 270
05-26 44° 68° 2738 1805 988 496 271
05-27 54° 64° 2775 1832 1005 505 275
05-28 53° 62° 2810 1857 1020 512 278
05-29 54° 72° 2852 1888 1042 525 286
05-30 57° 68° 2892 1919 1062 538 293
05-31 51° 66° 2928 1945 1079 546 297
06-01 43° 68° 2962 1969 1092 552 297
06-02 44° 77° 3000 1997 1110 562 303
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 57° 84° 3049 2036 1139 583 318
06-04 67° 85° 3103 2080 1173 609 339
06-05 67° 77° 3153 2119 1203 631 356
06-06 65° 76° 3202 2158 1232 651 372
06-07 62° 77° 3249 2196 1259 671 387
06-08 61° 76° 3296 2233 1286 690 400
06-09 62° 75° 3343 2269 1313 709 414
06-10 53° 73° 3384 2301 1334 722 423
06-11 56° 80° 3430 2337 1360 740 436
06-12 61° 84° 3481 2377 1391 762 453
06-13 67° 83° 3534 2420 1424 787 473
06-14 67° 77° 3584 2460 1454 810 490
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 65° 81° 3635 2501 1485 832 508
06-16 64° 79° 3684 2541 1514 854 525
06-17 68° 81° 3736 2583 1546 878 544
06-18 66° 86° 3791 2627 1581 905 565
06-19 66° 74° 3839 2666 1609 925 580
06-20 62° 83° 3889 2706 1639 947 598
06-21 67° 88° 3945 2752 1675 975 621
06-22 74° 92° 4006 2803 1716 1008 649
06-23 71° 93° 4067 2853 1757 1040 676
06-24 73° 93° 4128 2904 1798 1073 704
06-25 73° 90° 4187 2954 1838 1105 731
06-26 71° 87° 4245 3001 1875 1134 755
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 71° 90° 4303 3050 1913 1165 780
06-28 72° 85° 4360 3097 1950 1194 804
06-29 68° 87° 4416 3143 1986 1222 827
06-30 71° 81° 4470 3186 2020 1247 848
07-01 70° 82° 4524 3230 2054 1273 869
07-02 64° 84° 4575 3272 2085 1297 888
07-03 66° 87° 4630 3317 2120 1324 909
07-04 67° 89° 4686 3363 2156 1352 932
07-05 69° 89° 4743 3410 2193 1381 957
07-06 70° 90° 4801 3458 2231 1411 982
07-07 72° 84° 4857 3504 2267 1439 1004
07-08 70° 85° 4912 3549 2302 1466 1027
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 69° 86° 4968 3595 2338 1494 1049
07-10 68° 84° 5022 3639 2372 1520 1070
07-11 69° 89° 5079 3686 2409 1549 1094
07-12 72° 89° 5137 3734 2447 1579 1119
07-13 69° 86° 5193 3780 2483 1607 1142
07-14 71° 86° 5249 3826 2519 1635 1166
07-15 68° 88° 5305 3872 2555 1663 1188
07-16 74° 81° 5360 3917 2591 1690 1211
07-17 72° 84° 5416 3963 2626 1718 1234
07-18 68° 74° 5465 4002 2656 1739 1250
07-19 63° 84° 5517 4044 2687 1763 1268
07-20 71° 81° 5571 4087 2721 1788 1289
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 64° 79° 5620 4127 2750 1810 1306
07-22 59° 81° 5669 4165 2779 1830 1321
07-23 61° 86° 5720 4207 2810 1854 1339
07-24 68° 90° 5777 4253 2847 1882 1363
07-25 71° 87° 5834 4300 2884 1912 1387
07-26 70° 89° 5891 4348 2921 1941 1412
07-27 71° 82° 5946 4393 2956 1968 1433
07-28 70° 85° 6001 4438 2991 1995 1456
07-29 69° 87° 6057 4484 3027 2023 1479
07-30 69° 89° 6114 4531 3064 2052 1503
07-31 65° 75° 6162 4569 3092 2072 1518
08-01 58° 74° 6206 4603 3117 2088 1529
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 56° 74° 6250 4636 3140 2103 1539
08-03 54° 78° 6293 4670 3163 2119 1550
08-04 59° 78° 6340 4707 3190 2138 1563
08-05 60° 82° 6389 4746 3219 2159 1580
08-06 66° 83° 6442 4789 3252 2184 1599
08-07 65° 82° 6494 4830 3284 2207 1618
08-08 64° 85° 6546 4873 3316 2232 1638
08-09 65° 86° 6600 4917 3350 2258 1658
08-10 66° 87° 6655 4961 3385 2284 1680
08-11 67° 88° 6710 5007 3420 2312 1703
08-12 69° 87° 6766 5053 3456 2340 1726
08-13 69° 83° 6820 5097 3490 2366 1746
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 64° 85° 6873 5139 3523 2391 1766
08-15 65° 88° 6927 5184 3557 2417 1788
08-16 69° 89° 6984 5231 3594 2446 1811
08-17 70° 82° 7038 5275 3628 2472 1832
08-18 64° 82° 7089 5316 3659 2495 1851
08-19 65° 87° 7143 5360 3693 2521 1871
08-20 67° 74° 7192 5398 3722 2541 1887
08-21 65° 70° 7237 5434 3747 2559 1900
08-22 59° 79° 7284 5471 3774 2578 1913
08-23 63° 79° 7333 5509 3803 2599 1929
08-24 60° 76° 7379 5545 3829 2616 1942
08-25 52° 70° 7417 5574 3847 2627 1948
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 48° 69° 7454 5601 3864 2636 1952
08-27 46° 71° 7491 5628 3881 2645 1955
08-28 52° 68° 7529 5655 3899 2655 1960
08-29 54° 71° 7569 5686 3919 2667 1968
08-30 47° 71° 7606 5713 3936 2676 1972
08-31 48° 75° 7645 5742 3956 2687 1978
09-01 50° 78° 7688 5774 3978 2701 1987
09-02 50° 80° 7731 5807 4001 2717 1997
09-03 52° 81° 7775 5842 4025 2733 2009
09-04 52° 71° 7815 5871 4045 2744 2015
09-05 48° 77° 7855 5902 4065 2757 2023
09-06 52° 69° 7894 5930 4084 2768 2028
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 47° 69° 7930 5956 4100 2776 2031
09-08 43° 71° 7965 5982 4115 2783 2033
09-09 46° 76° 8004 6010 4134 2793 2039
09-10 50° 79° 8046 6043 4156 2808 2048
09-11 54° 80° 8091 6078 4181 2825 2060
09-12 51° 81° 8135 6112 4205 2841 2071
09-13 53° 83° 8181 6148 4231 2859 2084
09-14 56° 84° 8229 6186 4259 2879 2100
09-15 57° 85° 8278 6225 4288 2900 2116
09-16 56° 85° 8327 6263 4317 2921 2131
09-17 55° 85° 8375 6301 4345 2940 2146
09-18 56° 86° 8424 6340 4374 2961 2162
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 57° 88° 8474 6380 4404 2984 2179
09-20 60° 87° 8525 6422 4436 3007 2198
09-21 64° 84° 8577 6464 4467 3031 2216
09-22 65° 70° 8623 6499 4493 3048 2229
09-23 64° 80° 8673 6539 4523 3070 2246
09-24 63° 74° 8719 6576 4549 3089 2259
09-25 61° 71° 8763 6610 4573 3105 2270
09-26 56° 78° 8808 6644 4598 3121 2282
09-27 54° 82° 8854 6681 4624 3140 2295
09-28 57° 87° 8904 6721 4654 3162 2312
09-29 58° 86° 8954 6760 4684 3184 2329
09-30 54° 83° 9000 6797 4710 3202 2343
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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