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.

Welcome!

It appears to be your first time visiting GDDTracker
Please enter your zip code for a customized experience. Also, be sure and watch our video introduction video.

   
       

Ester/Amine Spring Broadleaf Herbicide Timer - Purdue (GDD 50)
through Wed, Apr. 1. 2026

 

GDD Total: 162 (Base 50) through Wed, Apr. 1, 2026

  

NE

        

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 29° 66° 26 16 6 0 0
02-16 45° 67° 59 39 19 6 1
02-17 45° 71° 96 66 36 14 4
02-18 39° 62° 124 84 44 14 4
02-19 20° 40° 132 84 44 14 4
02-20 13° 21° 132 84 44 14 4
02-21 18° 29° 134 84 44 14 4
02-22 8° 23° 134 84 44 14 4
02-23 3° 28° 134 84 44 14 4
02-24 25° 51° 150 91 44 14 4
02-25 32° 46° 167 98 44 14 4
02-26 23° 66° 190 110 47 14 4
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 34° 70° 220 130 57 16 4
02-28 29° 47° 236 136 57 16 4
03-01 22° 36° 243 136 57 16 4
03-02 33° 48° 261 144 57 16 4
03-03 38° 47° 282 155 57 16 4
03-04 39° 50° 305 168 60 16 4
03-05 41° 62° 334 187 70 18 4
03-06 32° 68° 362 206 78 18 4
03-07 31° 53° 382 216 78 18 4
03-08 40° 75° 418 242 94 26 7
03-09 44° 81° 459 272 114 38 14
03-10 37° 62° 486 289 121 38 14
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 32° 47° 504 297 121 38 14
03-12 26° 69° 529 312 127 38 14
03-13 34° 61° 555 328 132 38 14
03-14 34° 63° 581 344 139 38 14
03-15 16° 56° 595 348 139 38 14
03-16 8° 27° 595 348 139 38 14
03-17 13° 41° 600 348 139 38 14
03-18 30° 78° 632 371 151 43 14
03-19 42° 80° 672 400 170 54 20
03-20 44° 86° 715 433 193 69 31
03-21 48° 95° 764 473 223 91 47
03-22 40° 71° 798 496 237 96 48
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 25° 50° 813 502 237 96 48
03-24 32° 70° 842 521 246 98 48
03-25 52° 83° 888 556 271 115 60
03-26 44° 71° 923 582 287 123 63
03-27 28° 52° 941 590 287 123 63
03-28 25° 62° 963 601 289 123 63
03-29 47° 76° 1002 631 308 134 69
03-30 45° 88° 1047 665 333 151 81
03-31 48° 74° 1086 695 352 162 87
04-01 39° 52° 1110 708 355 162 87
04-02 44° 48° 1134 722 359 162 87
04-03 41° 57° 1161 739 366 162 87
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 30° 53° 1180 748 366 162 87
04-05 29° 64° 1205 763 371 162 87
04-06 34° 52° 1226 774 372 162 87
04-07 28° 55° 1245 784 372 162 87
04-08 40° 76° 1281 810 388 170 90
04-09 44° 64° 1313 832 400 174 90
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 11° 31° 0 0 0 0 0
02-16 2° 13° 0 0 0 0 0
02-17 -4° 8° 0 0 0 0 0
02-18 -8° 0° 0 0 0 0 0
02-19 -8° 3° 0 0 0 0 0
02-20 -15° 10° 0 0 0 0 0
02-21 -10° 23° 0 0 0 0 0
02-22 13° 40° 5 0 0 0 0
02-23 28° 60° 26 12 2 0 0
02-24 40° 68° 58 34 14 4 0
02-25 30° 65° 84 49 19 4 0
02-26 39° 59° 111 66 26 4 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 35° 61° 137 82 32 4 0
02-28 39° 62° 166 101 41 5 0
03-01 24° 41° 176 102 41 5 0
03-02 23° 59° 195 111 41 5 0
03-03 40° 59° 223 128 48 5 0
03-04 30° 56° 244 139 50 5 0
03-05 23° 37° 252 139 50 5 0
03-06 23° 43° 263 141 50 5 0
03-07 30° 39° 276 143 50 5 0
03-08 21° 56° 293 150 50 5 0
03-09 25° 68° 317 165 54 5 0
03-10 33° 82° 353 190 70 12 3
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 37° 58° 378 206 76 12 3
03-12 27° 74° 407 224 84 13 3
03-13 33° 78° 440 248 98 18 3
03-14 55° 73° 483 280 120 32 13
03-15 34° 47° 501 289 120 32 13
03-16 22° 56° 518 296 120 32 13
03-17 41° 84° 558 326 140 45 20
03-18 42° 72° 593 351 155 52 22
03-19 31° 51° 613 360 155 52 22
03-20 17° 47° 623 360 155 52 22
03-21 40° 58° 650 378 162 52 22
03-22 32° 70° 679 397 171 53 22
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 45° 60° 709 417 182 55 22
03-24 36° 66° 738 436 191 56 22
03-25 38° 62° 766 454 199 56 22
03-26 33° 69° 795 473 208 57 22
03-27 46° 83° 838 505 230 71 31
03-28 65° 81° 889 546 261 94 49
03-29 40° 65° 919 567 271 97 49
03-30 35° 39° 934 572 271 97 49
03-31 34° 54° 956 584 273 97 49
04-01 43° 56° 984 601 281 97 49
04-02 44° 55° 1012 619 289 97 49
04-03 33° 56° 1035 632 292 97 49
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 40° 51° 1058 646 295 97 49
04-05 31° 49° 1076 653 295 97 49
04-06 22° 59° 1094 662 295 97 49
04-07 34° 50° 1115 672 296 97 49
04-08 26° 64° 1138 685 299 97 49
04-09 42° 74° 1174 711 315 105 52
04-10 48° 69° 1210 737 331 113 56
04-11 35° 68° 1239 757 340 114 56
04-12 48° 81° 1282 789 363 129 65
04-13 59° 79° 1329 826 389 148 79
04-14 46° 61° 1360 848 401 151 79
04-15 37° 66° 1390 867 411 153 79
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 47° 80° 1431 899 432 167 88
04-17 62° 85° 1483 941 464 190 106
04-18 46° 60° 1514 962 475 193 106
04-19 37° 59° 1540 978 481 193 106
04-20 42° 48° 1563 991 484 193 106
04-21 37° 77° 1598 1016 499 200 108
04-22 50° 73° 1637 1045 518 211 114
04-23 50° 77° 1679 1076 540 225 123
04-24 56° 69° 1719 1107 560 237 130
04-25 47° 56° 1748 1126 569 238 130
04-26 45° 61° 1780 1147 580 242 130
04-27 53° 65° 1816 1174 597 250 134
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 63° 88° 1870 1218 631 276 155
04-29 47° 67° 1905 1243 646 283 157
04-30 47° 65° 1939 1267 660 289 158
05-01 56° 69° 1979 1297 680 301 165
05-02 50° 58° 2012 1319 693 306 165
05-03 38° 68° 2043 1340 704 309 165
05-04 42° 74° 2079 1366 720 317 168
05-05 46° 79° 2119 1397 740 329 175
05-06 48° 77° 2160 1428 761 342 183
05-07 55° 77° 2204 1461 785 358 194
05-08 55° 80° 2249 1497 810 375 206
05-09 51° 84° 2294 1532 835 392 219
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 53° 88° 2343 1571 864 413 234
05-11 57° 87° 2393 1611 894 435 252
05-12 56° 86° 2442 1649 923 456 267
05-13 58° 87° 2492 1690 953 478 285
05-14 63° 89° 2546 1734 987 504 306
05-15 62° 80° 2595 1773 1016 525 322
05-16 57° 73° 2638 1805 1039 540 331
05-17 51° 75° 2678 1836 1059 552 339
05-18 47° 79° 2720 1867 1081 566 347
05-19 57° 76° 2764 1902 1105 582 359
05-20 51° 63° 2799 1927 1120 589 361
05-21 46° 70° 2835 1953 1136 597 363
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 46° 68° 2870 1977 1151 604 365
05-23 46° 61° 2901 1999 1162 607 365
05-24 54° 73° 2943 2030 1183 621 374
05-25 54° 67° 2981 2059 1202 631 379
05-26 54° 63° 3018 2085 1219 640 383
05-27 53° 60° 3052 2110 1233 646 384
05-28 48° 67° 3088 2135 1249 654 387
05-29 53° 70° 3127 2165 1268 665 393
05-30 50° 78° 3169 2197 1290 679 402
05-31 58° 86° 3219 2237 1320 701 419
06-01 57° 85° 3268 2276 1349 722 435
06-02 62° 91° 3323 2320 1384 749 457
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 56° 78° 3368 2355 1409 766 469
06-04 49° 73° 3407 2384 1428 777 475
06-05 57° 70° 3448 2416 1449 790 483
06-06 59° 76° 3494 2451 1475 808 496
06-07 62° 78° 3542 2489 1503 828 511
06-08 57° 68° 3583 2520 1523 841 519
06-09 55° 76° 3626 2554 1547 856 529
06-10 54° 89° 3676 2593 1576 878 546
06-11 66° 93° 3733 2641 1614 907 570
06-12 63° 84° 3785 2683 1646 931 589
06-13 64° 86° 3838 2726 1679 956 609
06-14 66° 88° 3893 2770 1714 983 631
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 68° 91° 3950 2818 1751 1012 655
06-16 71° 92° 4009 2867 1790 1043 681
06-17 68° 80° 4062 2909 1823 1068 701
06-18 63° 80° 4111 2949 1852 1089 717
06-19 61° 92° 4166 2993 1887 1116 739
06-20 76° 100° 4232 3049 1933 1154 772
06-21 81° 99° 4299 3107 1980 1193 806
06-22 79° 95° 4364 3162 2025 1230 838
06-23 72° 86° 4421 3209 2062 1259 862
06-24 71° 81° 4475 3253 2096 1285 883
06-25 71° 91° 4535 3302 2135 1317 910
06-26 71° 86° 4591 3349 2172 1345 933
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 66° 89° 4647 3394 2208 1373 956
06-28 72° 91° 4706 3444 2247 1404 982
06-29 67° 80° 4758 3485 2279 1428 1001
06-30 70° 83° 4812 3530 2313 1454 1022
07-01 60° 86° 4863 3571 2344 1477 1040
07-02 67° 92° 4921 3619 2382 1507 1065
07-03 71° 92° 4980 3668 2421 1538 1091
07-04 72° 88° 5038 3716 2459 1568 1116
07-05 73° 89° 5097 3765 2498 1599 1142
07-06 69° 85° 5153 3810 2533 1627 1165
07-07 67° 88° 5208 3856 2569 1654 1187
07-08 65° 87° 5262 3900 2603 1680 1208
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 68° 90° 5319 3947 2640 1709 1232
07-10 71° 91° 5378 3996 2679 1740 1258
07-11 68° 80° 5430 4037 2711 1764 1277
07-12 67° 78° 5480 4078 2741 1786 1294
07-13 58° 85° 5529 4117 2770 1807 1310
07-14 66° 91° 5586 4163 2807 1836 1334
07-15 68° 92° 5644 4212 2845 1866 1359
07-16 65° 79° 5694 4252 2875 1888 1376
07-17 61° 75° 5741 4288 2901 1907 1390
07-18 65° 84° 5793 4330 2934 1931 1409
07-19 73° 90° 5853 4380 2973 1963 1436
07-20 71° 89° 5911 4429 3012 1993 1461
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 71° 84° 5966 4474 3047 2020 1483
07-22 70° 86° 6023 4520 3083 2049 1507
07-23 76° 92° 6085 4572 3126 2083 1536
07-24 69° 81° 6138 4615 3159 2108 1556
07-25 69° 80° 6190 4658 3191 2132 1575
07-26 71° 88° 6248 4705 3229 2162 1600
07-27 73° 94° 6309 4757 3270 2195 1628
07-28 72° 94° 6371 4808 3312 2229 1657
07-29 76° 95° 6435 4862 3355 2265 1688
07-30 68° 85° 6489 4907 3390 2291 1709
07-31 68° 77° 6540 4947 3421 2314 1727
08-01 61° 74° 6585 4983 3446 2331 1739
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 57° 76° 6630 5017 3471 2348 1751
08-03 63° 69° 6674 5052 3495 2364 1762
08-04 61° 78° 6722 5089 3522 2384 1777
08-05 64° 83° 6773 5131 3554 2407 1795
08-06 66° 86° 6827 5175 3588 2433 1816
08-07 72° 88° 6886 5223 3626 2464 1842
08-08 75° 93° 6948 5275 3669 2498 1871
08-09 73° 87° 7006 5323 3707 2528 1896
08-10 68° 83° 7059 5367 3740 2553 1916
08-11 67° 78° 7110 5407 3771 2576 1934
08-12 64° 84° 7162 5450 3803 2600 1953
08-13 63° 86° 7215 5492 3836 2625 1973
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 70° 89° 7273 5540 3874 2655 1998
08-15 75° 93° 7335 5592 3916 2689 2027
08-16 77° 95° 7399 5646 3960 2725 2058
08-17 75° 92° 7461 5698 4002 2759 2087
08-18 71° 88° 7518 5746 4039 2788 2111
08-19 71° 89° 7577 5794 4078 2819 2137
08-20 69° 89° 7634 5841 4115 2848 2161
08-21 67° 89° 7690 5887 4151 2876 2184
08-22 66° 88° 7745 5933 4186 2903 2206
08-23 63° 77° 7793 5970 4214 2923 2221
08-24 58° 74° 7837 6004 4238 2939 2232
08-25 52° 74° 7877 6035 4258 2951 2239
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 53° 78° 7921 6068 4282 2967 2250
08-27 57° 79° 7967 6104 4308 2985 2263
08-28 60° 76° 8013 6140 4334 3003 2276
08-29 59° 80° 8060 6178 4361 3022 2290
08-30 64° 71° 8105 6213 4386 3039 2302
08-31 63° 68° 8149 6247 4410 3055 2313
09-01 60° 66° 8190 6278 4431 3068 2321
09-02 58° 75° 8235 6313 4456 3085 2333
09-03 56° 71° 8277 6344 4478 3099 2342
09-04 47° 72° 8314 6371 4495 3108 2346
09-05 55° 67° 8352 6400 4513 3118 2351
09-06 45° 70° 8388 6425 4529 3126 2354
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 46° 78° 8428 6455 4549 3138 2361
09-08 57° 71° 8470 6488 4571 3152 2370
09-09 63° 78° 8518 6526 4599 3172 2385
09-10 60° 82° 8568 6565 4629 3194 2402
09-11 63° 87° 8621 6608 4662 3219 2422
09-12 72° 91° 8681 6658 4701 3251 2449
09-13 68° 94° 8739 6707 4740 3281 2474
09-14 69° 87° 8795 6753 4776 3309 2497
09-15 63° 89° 8849 6797 4810 3335 2518
09-16 67° 91° 8906 6844 4847 3364 2542
09-17 66° 77° 8956 6884 4877 3386 2559
09-18 61° 72° 9001 6918 4902 3403 2571
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 56° 73° 9043 6951 4924 3417 2580
09-20 61° 75° 9089 6987 4950 3435 2593
09-21 56° 80° 9136 7023 4977 3454 2607
09-22 60° 88° 9188 7066 5009 3478 2626
09-23 63° 76° 9235 7103 5036 3497 2640
09-24 58° 78° 9281 7139 5062 3515 2653
09-25 53° 82° 9327 7175 5088 3533 2666
09-26 54° 85° 9375 7213 5116 3553 2681
09-27 58° 81° 9423 7250 5144 3573 2696
09-28 49° 87° 9469 7286 5170 3591 2709
09-29 57° 86° 9519 7326 5199 3613 2726
09-30 61° 81° 9568 7365 5229 3634 2742
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.


 

 

© Copyright 2004-2026, Department of Crop and Soil Sciences, Michigan State University.
Weather data and programming assistance provided by Enviro-Weather and NWS
All Rights Reserved. Custom web development by Dynamite Inc.