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Ester/Amine Spring Broadleaf Herbicide Timer - Purdue (GDD 50)
forecast for Tue, Apr. 7. 2026

 

Forecasted GDD Total: 231 (Base 50) through Tue, Apr. 7, 2026

  

Columbus, OH

        

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

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 35° 47° 19 9 0 0 0
02-16 32° 45° 36 16 0 0 0
02-17 30° 55° 57 27 1 0 0
02-18 48° 65° 91 51 15 6 1
02-19 48° 63° 124 74 29 12 2
02-20 34° 55° 147 87 31 12 2
02-21 30° 40° 160 90 31 12 2
02-22 25° 32° 166 90 31 12 2
02-23 22° 28° 169 90 31 12 2
02-24 20° 36° 175 90 31 12 2
02-25 35° 52° 196 101 33 12 2
02-26 26° 47° 211 106 33 12 2
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 30° 58° 233 118 35 12 2
02-28 40° 60° 262 136 43 12 2
03-01 25° 39° 272 137 43 12 2
03-02 22° 34° 278 137 43 12 2
03-03 33° 50° 298 146 43 12 2
03-04 45° 55° 325 164 51 12 2
03-05 55° 63° 362 190 67 20 5
03-06 55° 75° 405 223 90 35 15
03-07 59° 71° 448 256 113 50 25
03-08 44° 60° 478 276 123 52 25
03-09 40° 70° 510 299 136 57 25
03-10 58° 75° 555 333 160 73 37
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 38° 69° 586 355 172 77 37
03-12 31° 45° 602 361 172 77 37
03-13 35° 59° 628 376 177 77 37
03-14 31° 47° 645 384 177 77 37
03-15 39° 75° 680 409 192 84 39
03-16 27° 65° 705 423 197 84 39
03-17 22° 27° 707 423 197 84 39
03-18 21° 39° 715 423 197 84 39
03-19 36° 65° 743 442 205 85 39
03-20 47° 69° 779 468 221 93 42
03-21 39° 63° 809 487 230 94 42
03-22 46° 85° 852 520 254 110 52
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 33° 43° 868 526 254 110 52
03-24 25° 50° 884 532 254 110 52
03-25 38° 65° 913 551 264 111 52
03-26 58° 80° 960 588 290 130 66
03-27 34° 54° 982 600 292 130 66
03-28 29° 45° 997 605 292 130 66
03-29 32° 64° 1023 621 298 130 66
03-30 58° 73° 1066 654 322 145 76
03-31 62° 79° 1115 693 350 166 92
04-01 45° 69° 1150 718 365 173 94
04-02 45° 81° 1191 749 386 186 102
04-03 66° 80° 1242 790 417 209 120
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 63° 82° 1292 830 447 231 137
04-05 45° 53° 1319 847 454 231 137
04-06 36° 56° 1343 861 458 231 137
04-07 34° 49° 1363 871 458 231 137
04-08 28° 60° 1385 883 460 231 137
04-09 44° 71° 1420 908 476 239 140
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 30° 39° 12 2 0 0 0
02-16 27° 39° 24 4 0 0 0
02-17 11° 26° 24 4 0 0 0
02-18 8° 19° 24 4 0 0 0
02-19 12° 21° 24 4 0 0 0
02-20 14° 20° 24 4 0 0 0
02-21 20° 29° 26 4 0 0 0
02-22 15° 33° 27 4 0 0 0
02-23 21° 40° 36 4 0 0 0
02-24 31° 51° 55 12 0 0 0
02-25 37° 58° 80 28 6 0 0
02-26 27° 54° 99 37 6 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 38° 51° 121 49 8 0 0
02-28 30° 58° 144 61 10 0 0
03-01 25° 53° 160 68 10 0 0
03-02 18° 33° 164 68 10 0 0
03-03 20° 40° 172 68 10 0 0
03-04 36° 66° 201 87 19 1 0
03-05 34° 60° 227 102 24 1 0
03-06 30° 37° 238 104 24 1 0
03-07 28° 42° 251 107 24 1 0
03-08 30° 43° 266 111 24 1 0
03-09 28° 57° 287 122 25 1 0
03-10 31° 65° 313 138 31 1 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 39° 74° 347 163 46 7 2
03-12 36° 71° 379 184 57 11 2
03-13 35° 73° 411 207 69 15 2
03-14 44° 78° 450 236 89 27 8
03-15 57° 71° 492 268 111 41 17
03-16 38° 60° 519 285 118 41 17
03-17 30° 47° 536 292 118 41 17
03-18 35° 70° 567 312 129 43 17
03-19 54° 71° 607 343 149 56 24
03-20 37° 65° 636 362 158 57 24
03-21 25° 52° 653 368 158 57 24
03-22 37° 50° 675 380 160 57 24
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 29° 46° 690 385 160 57 24
03-24 37° 54° 713 399 163 57 24
03-25 36° 52° 735 411 165 57 24
03-26 28° 51° 753 418 165 57 24
03-27 32° 61° 777 433 170 57 24
03-28 48° 75° 817 463 190 68 31
03-29 63° 77° 866 501 218 89 47
03-30 56° 70° 907 532 239 102 55
03-31 41° 57° 934 549 246 102 55
04-01 39° 52° 957 563 249 102 55
04-02 43° 80° 997 592 269 113 61
04-03 50° 76° 1038 624 290 127 69
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 50° 55° 1068 644 301 129 69
04-05 48° 66° 1103 669 315 136 71
04-06 38° 48° 1124 680 316 136 71
04-07 31° 55° 1145 691 318 136 71
04-08 26° 41° 1157 693 318 136 71
04-09 26° 48° 1172 698 318 136 71
04-10 42° 59° 1200 716 326 136 71
04-11 34° 42° 1216 722 326 136 71
04-12 29° 54° 1236 731 326 136 71
04-13 31° 60° 1259 745 330 136 71
04-14 52° 75° 1300 776 351 150 80
04-15 42° 57° 1328 794 358 150 80
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 36° 54° 1351 807 362 150 80
04-17 32° 64° 1377 822 367 150 80
04-18 54° 81° 1422 858 393 167 92
04-19 62° 78° 1470 896 421 187 107
04-20 51° 72° 1510 925 440 198 113
04-21 58° 74° 1554 959 464 215 125
04-22 46° 70° 1590 985 480 223 128
04-23 46° 79° 1631 1016 501 235 135
04-24 51° 83° 1676 1051 526 253 148
04-25 62° 73° 1722 1087 552 270 160
04-26 47° 65° 1756 1111 566 277 162
04-27 38° 66° 1786 1131 576 279 162
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 45° 79° 1826 1161 596 291 168
04-29 63° 80° 1875 1201 625 312 185
04-30 52° 73° 1915 1231 646 324 192
05-01 61° 78° 1963 1269 673 344 207
05-02 60° 74° 2008 1304 698 361 219
05-03 50° 61° 2042 1327 712 366 219
05-04 48° 61° 2074 1350 724 371 219
05-05 47° 62° 2107 1372 737 375 219
05-06 51° 60° 2140 1396 751 381 220
05-07 53° 70° 2180 1426 770 393 227
05-08 50° 71° 2219 1454 789 403 232
05-09 42° 64° 2249 1475 800 406 232
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 39° 74° 2284 1500 815 413 234
05-11 49° 80° 2327 1532 837 428 244
05-12 58° 74° 2371 1566 861 444 255
05-13 63° 73° 2417 1602 887 462 268
05-14 61° 73° 2462 1638 912 479 280
05-15 62° 84° 2513 1678 943 502 297
05-16 64° 79° 2562 1718 972 523 314
05-17 63° 72° 2607 1753 998 540 326
05-18 60° 72° 2651 1787 1022 556 337
05-19 51° 72° 2691 1816 1041 567 343
05-20 51° 60° 2724 1839 1054 573 343
05-21 55° 68° 2763 1869 1074 584 350
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 51° 56° 2795 1890 1085 587 350
05-23 43° 61° 2825 1910 1095 590 350
05-24 43° 68° 2858 1934 1108 595 350
05-25 44° 67° 2892 1957 1122 600 351
05-26 44° 71° 2927 1983 1137 608 353
05-27 55° 63° 2964 2010 1155 617 357
05-28 54° 62° 3000 2036 1171 625 361
05-29 54° 74° 3042 2068 1192 639 369
05-30 56° 64° 3080 2095 1210 649 374
05-31 51° 67° 3117 2123 1228 658 379
06-01 44° 70° 3152 2148 1243 665 381
06-02 43° 79° 3191 2177 1262 676 387
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 52° 86° 3238 2214 1289 695 401
06-04 67° 87° 3294 2259 1324 723 423
06-05 65° 81° 3345 2301 1355 746 441
06-06 68° 82° 3398 2343 1388 771 461
06-07 65° 79° 3448 2383 1418 792 478
06-08 64° 77° 3496 2422 1447 813 493
06-09 65° 72° 3543 2458 1473 831 507
06-10 58° 76° 3587 2493 1498 848 518
06-11 55° 83° 3635 2530 1525 867 533
06-12 60° 87° 3686 2572 1557 891 552
06-13 70° 85° 3742 2618 1593 919 574
06-14 70° 81° 3796 2661 1626 945 595
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 68° 80° 3848 2703 1658 969 614
06-16 65° 83° 3900 2745 1690 993 633
06-17 69° 81° 3953 2788 1723 1017 653
06-18 68° 87° 4008 2833 1758 1045 675
06-19 65° 76° 4056 2872 1786 1065 690
06-20 62° 85° 4107 2913 1818 1088 709
06-21 68° 89° 4164 2960 1854 1117 732
06-22 73° 94° 4225 3011 1896 1150 761
06-23 72° 95° 4287 3062 1937 1184 789
06-24 74° 95° 4350 3115 1980 1218 819
06-25 75° 91° 4410 3166 2021 1251 847
06-26 72° 89° 4469 3214 2059 1281 872
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 73° 91° 4528 3264 2099 1313 899
06-28 71° 89° 4587 3312 2137 1344 924
06-29 71° 85° 4643 3358 2173 1371 947
06-30 72° 82° 4698 3404 2208 1399 969
07-01 71° 79° 4751 3446 2241 1424 989
07-02 65° 84° 4804 3489 2274 1448 1009
07-03 67° 89° 4860 3535 2310 1476 1032
07-04 68° 91° 4917 3583 2348 1506 1056
07-05 68° 91° 4975 3631 2385 1536 1081
07-06 70° 91° 5034 3679 2424 1566 1107
07-07 74° 87° 5092 3728 2462 1597 1132
07-08 72° 85° 5148 3774 2499 1625 1156
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 72° 85° 5205 3820 2535 1654 1179
07-10 71° 83° 5260 3865 2570 1680 1201
07-11 70° 90° 5318 3913 2608 1710 1226
07-12 73° 88° 5376 3961 2646 1740 1251
07-13 70° 85° 5431 4007 2682 1768 1274
07-14 71° 84° 5487 4052 2717 1795 1296
07-15 67° 88° 5542 4098 2753 1823 1319
07-16 75° 83° 5599 4145 2790 1852 1343
07-17 72° 84° 5656 4191 2826 1881 1366
07-18 71° 76° 5707 4233 2858 1904 1384
07-19 65° 83° 5759 4275 2889 1928 1403
07-20 71° 82° 5814 4319 2924 1955 1425
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 66° 79° 5864 4360 2955 1977 1442
07-22 60° 83° 5913 4399 2984 1998 1459
07-23 60° 87° 5965 4440 3015 2021 1477
07-24 65° 92° 6021 4487 3052 2050 1501
07-25 73° 88° 6080 4535 3090 2081 1526
07-26 70° 90° 6138 4583 3128 2111 1551
07-27 72° 84° 6194 4629 3164 2139 1574
07-28 73° 86° 6251 4677 3201 2168 1598
07-29 72° 85° 6308 4723 3238 2197 1622
07-30 70° 90° 6366 4771 3276 2226 1647
07-31 66° 76° 6415 4810 3305 2248 1663
08-01 57° 77° 6460 4845 3330 2265 1675
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 57° 76° 6504 4880 3355 2281 1686
08-03 54° 81° 6550 4916 3380 2299 1699
08-04 58° 80° 6597 4953 3408 2318 1713
08-05 61° 84° 6648 4994 3439 2341 1731
08-06 67° 84° 6702 5038 3472 2367 1752
08-07 65° 84° 6754 5080 3505 2391 1772
08-08 65° 86° 6808 5123 3538 2417 1792
08-09 64° 88° 6862 5167 3572 2442 1813
08-10 65° 90° 6917 5212 3607 2470 1835
08-11 67° 90° 6973 5259 3644 2498 1859
08-12 69° 91° 7031 5307 3682 2528 1883
08-13 71° 85° 7087 5352 3717 2556 1906
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 67° 87° 7142 5397 3752 2583 1928
08-15 67° 87° 7196 5442 3787 2609 1950
08-16 69° 91° 7254 5490 3825 2639 1974
08-17 72° 88° 7312 5537 3862 2669 1999
08-18 64° 85° 7364 5580 3895 2693 2018
08-19 65° 90° 7419 5625 3930 2720 2041
08-20 69° 76° 7470 5666 3960 2743 2058
08-21 66° 73° 7518 5704 3988 2763 2073
08-22 62° 82° 7568 5744 4018 2785 2090
08-23 63° 83° 7619 5785 4049 2808 2108
08-24 63° 79° 7668 5824 4079 2829 2124
08-25 54° 73° 7710 5855 4100 2843 2133
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 49° 72° 7749 5884 4119 2853 2139
08-27 47° 74° 7787 5913 4137 2864 2144
08-28 48° 71° 7825 5940 4155 2873 2149
08-29 53° 74° 7866 5971 4176 2887 2157
08-30 45° 73° 7903 5999 4194 2896 2161
08-31 48° 78° 7945 6030 4215 2909 2170
09-01 51° 80° 7988 6064 4238 2925 2180
09-02 48° 82° 8031 6097 4261 2940 2190
09-03 52° 83° 8076 6132 4287 2957 2202
09-04 55° 74° 8118 6164 4309 2971 2211
09-05 49° 80° 8161 6197 4331 2986 2221
09-06 53° 71° 8201 6227 4351 2998 2228
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 44° 70° 8236 6252 4366 3005 2230
09-08 42° 73° 8272 6277 4382 3013 2233
09-09 44° 77° 8310 6306 4401 3023 2239
09-10 45° 80° 8351 6337 4421 3036 2246
09-11 52° 83° 8396 6372 4447 3053 2259
09-12 51° 84° 8442 6407 4472 3070 2271
09-13 51° 85° 8487 6443 4498 3088 2284
09-14 56° 86° 8536 6482 4527 3109 2299
09-15 57° 88° 8587 6522 4557 3131 2317
09-16 58° 85° 8636 6562 4587 3153 2333
09-17 55° 86° 8685 6600 4615 3173 2349
09-18 54° 87° 8734 6639 4644 3194 2365
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 53° 88° 8782 6678 4673 3215 2380
09-20 60° 89° 8835 6720 4705 3239 2400
09-21 66° 86° 8888 6764 4739 3265 2421
09-22 66° 76° 8937 6803 4768 3286 2436
09-23 65° 80° 8987 6843 4798 3308 2453
09-24 67° 74° 9036 6881 4826 3329 2469
09-25 65° 74° 9083 6919 4854 3348 2483
09-26 57° 80° 9130 6956 4880 3367 2497
09-27 54° 83° 9177 6993 4907 3386 2511
09-28 55° 88° 9226 7032 4937 3407 2527
09-29 58° 87° 9276 7072 4967 3429 2545
09-30 56° 85° 9325 7111 4995 3450 2560
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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