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Relative Flowering Times for Broadleaf Weeds (GDD 50)
through Sat, Mar. 28. 2026

 

GDD Total: 5 (Base 50) through Sat, Mar. 28, 2026

  

Glenview, 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

Late Season (Biennials and Perennials)

1401

Mid Season and Late Season (SA and Perennials)

601

Mid Season (Perennials)

201

Early and Mid Season (WA and Perennials)

21

Early Season (WA)

5

 

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 31° 50° 19 9 0 0 0
02-16 32° 58° 42 22 3 0 0
02-17 38° 49° 64 34 5 0 0
02-18 45° 56° 92 52 13 0 0
02-19 37° 46° 111 61 13 0 0
02-20 28° 42° 125 65 13 0 0
02-21 26° 29° 130 65 13 0 0
02-22 21° 27° 132 65 13 0 0
02-23 21° 27° 134 65 13 0 0
02-24 22° 38° 143 65 13 0 0
02-25 27° 36° 152 65 13 0 0
02-26 23° 39° 162 65 13 0 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 31° 56° 183 76 15 0 0
02-28 28° 46° 198 81 15 0 0
03-01 27° 29° 204 81 15 0 0
03-02 28° 36° 214 81 15 0 0
03-03 34° 38° 228 85 15 0 0
03-04 32° 39° 241 89 15 0 0
03-05 37° 41° 258 96 15 0 0
03-06 38° 56° 283 111 20 0 0
03-07 39° 58° 310 127 26 0 0
03-08 34° 56° 333 140 29 0 0
03-09 45° 63° 365 162 41 4 0
03-10 35° 57° 389 176 45 4 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 34° 40° 403 180 45 4 0
03-12 31° 41° 417 184 45 4 0
03-13 36° 42° 434 191 45 4 0
03-14 30° 35° 445 192 45 4 0
03-15 34° 51° 465 202 45 4 0
03-16 23° 34° 472 202 45 4 0
03-17 17° 24° 472 202 45 4 0
03-18 25° 42° 483 204 45 4 0
03-19 35° 46° 502 212 45 4 0
03-20 38° 57° 527 228 51 4 0
03-21 38° 65° 553 244 57 4 0
03-22 33° 64° 580 260 64 4 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 31° 36° 591 262 64 4 0
03-24 31° 43° 606 267 64 4 0
03-25 39° 63° 635 286 72 5 0
03-26 34° 56° 658 299 76 5 0
03-27 31° 38° 671 301 76 5 0
03-28 27° 44° 684 305 76 5 0
03-29 40° 56° 710 321 81 5 0
03-30 46° 70° 746 347 97 13 3
03-31 34° 63° 772 363 103 13 3
04-01 35° 38° 787 367 103 13 3
04-02 36° 61° 813 384 110 13 3
04-03 46° 49° 839 400 116 13 3
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 39° 58° 866 416 122 13 3
04-05 37° 50° 887 428 124 13 3
04-06 38° 49° 909 440 125 13 3
04-07 31° 40° 922 443 125 13 3
04-08 33° 56° 945 456 128 13 3
04-09 48° 60° 977 478 140 17 3
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 27° 33° 8 0 0 0 0
02-16 17° 30° 10 0 0 0 0
02-17 5° 14° 10 0 0 0 0
02-18 2° 13° 10 0 0 0 0
02-19 9° 17° 10 0 0 0 0
02-20 10° 25° 10 0 0 0 0
02-21 16° 29° 10 0 0 0 0
02-22 19° 33° 14 0 0 0 0
02-23 27° 40° 25 1 0 0 0
02-24 38° 49° 47 13 2 0 0
02-25 35° 45° 65 21 2 0 0
02-26 34° 39° 80 26 2 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 35° 43° 97 33 2 0 0
02-28 34° 52° 118 44 3 0 0
03-01 23° 37° 125 44 3 0 0
03-02 21° 34° 131 44 3 0 0
03-03 32° 43° 147 49 3 0 0
03-04 39° 44° 166 59 3 0 0
03-05 30° 46° 183 65 3 0 0
03-06 28° 39° 194 67 3 0 0
03-07 34° 37° 208 70 3 0 0
03-08 29° 45° 222 75 3 0 0
03-09 35° 53° 245 87 5 0 0
03-10 39° 60° 272 105 13 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 36° 55° 296 118 16 0 0
03-12 36° 41° 312 125 16 0 0
03-13 34° 46° 331 133 16 0 0
03-14 40° 63° 360 153 26 1 0
03-15 43° 59° 389 171 34 2 0
03-16 31° 41° 403 175 34 2 0
03-17 27° 47° 418 180 34 2 0
03-18 38° 58° 444 197 41 2 0
03-19 37° 39° 460 203 41 2 0
03-20 32° 41° 474 207 41 2 0
03-21 31° 53° 494 217 41 2 0
03-22 32° 49° 512 225 41 2 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 34° 43° 529 231 41 2 0
03-24 34° 44° 546 239 41 2 0
03-25 33° 42° 562 244 41 2 0
03-26 31° 42° 576 249 41 2 0
03-27 38° 50° 598 261 43 2 0
03-28 44° 69° 633 285 57 9 2
03-29 34° 63° 659 302 64 9 2
03-30 36° 61° 686 319 70 9 2
03-31 34° 42° 702 325 70 9 2
04-01 33° 42° 717 330 70 9 2
04-02 38° 61° 745 348 78 9 2
04-03 42° 58° 773 366 86 9 2
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 37° 42° 790 373 86 9 2
04-05 39° 47° 811 384 87 9 2
04-06 36° 41° 828 391 87 9 2
04-07 32° 41° 843 396 87 9 2
04-08 27° 37° 853 396 87 9 2
04-09 35° 40° 868 401 87 9 2
04-10 36° 39° 884 407 87 9 2
04-11 36° 43° 901 414 87 9 2
04-12 36° 49° 922 425 87 9 2
04-13 46° 54° 950 443 95 9 2
04-14 48° 57° 980 463 106 11 2
04-15 39° 49° 1002 475 107 11 2
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 36° 42° 1019 482 107 11 2
04-17 38° 55° 1043 496 112 11 2
04-18 51° 67° 1080 523 129 20 6
04-19 38° 62° 1109 542 138 21 6
04-20 41° 49° 1132 555 140 21 6
04-21 45° 54° 1159 572 148 21 6
04-22 40° 65° 1190 593 158 23 6
04-23 47° 61° 1222 615 170 27 6
04-24 45° 54° 1249 632 178 27 6
04-25 43° 49° 1273 646 182 27 6
04-26 41° 45° 1294 657 183 27 6
04-27 38° 54° 1318 671 186 27 6
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 47° 71° 1355 698 204 36 10
04-29 46° 68° 1390 723 218 43 12
04-30 41° 49° 1413 736 222 43 12
05-01 45° 61° 1444 757 232 46 12
05-02 41° 52° 1468 771 237 46 12
05-03 43° 45° 1491 784 239 46 12
05-04 43° 49° 1515 798 243 46 12
05-05 44° 49° 1539 812 248 46 12
05-06 43° 67° 1572 835 261 51 12
05-07 45° 56° 1601 854 269 52 12
05-08 43° 48° 1624 867 273 52 12
05-09 40° 51° 1648 881 276 52 12
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 45° 62° 1679 902 288 55 12
05-11 42° 53° 1705 918 293 55 12
05-12 45° 57° 1733 936 302 56 12
05-13 51° 60° 1767 960 316 61 12
05-14 49° 61° 1800 983 329 66 12
05-15 48° 76° 1840 1013 349 79 20
05-16 57° 75° 1884 1047 372 94 30
05-17 51° 64° 1919 1072 388 102 33
05-18 45° 56° 1948 1091 396 102 33
05-19 42° 49° 1972 1105 400 102 33
05-20 47° 50° 1998 1121 407 102 33
05-21 46° 49° 2024 1137 412 102 33
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 46° 50° 2050 1153 418 102 33
05-23 43° 52° 2075 1168 424 102 33
05-24 43° 52° 2101 1184 430 102 33
05-25 48° 53° 2130 1203 438 103 33
05-26 45° 54° 2157 1220 446 103 33
05-27 50° 57° 2188 1241 457 106 33
05-28 50° 54° 2219 1262 467 108 33
05-29 51° 60° 2252 1285 481 114 33
05-30 50° 66° 2289 1312 497 122 37
05-31 49° 57° 2319 1332 508 125 37
06-01 45° 54° 2347 1350 515 125 37
06-02 47° 70° 2384 1377 532 134 40
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 63° 77° 2432 1415 560 154 55
06-04 52° 69° 2470 1443 578 164 61
06-05 52° 62° 2504 1467 593 171 62
06-06 55° 63° 2541 1494 610 179 66
06-07 53° 62° 2576 1519 625 187 68
06-08 57° 67° 2616 1549 645 199 75
06-09 55° 64° 2654 1577 662 208 80
06-10 55° 69° 2694 1607 682 220 87
06-11 60° 82° 2743 1646 712 241 103
06-12 59° 68° 2785 1678 733 255 112
06-13 57° 62° 2823 1706 751 265 116
06-14 56° 62° 2860 1733 769 274 121
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 56° 66° 2899 1762 787 285 127
06-16 57° 72° 2941 1794 810 300 136
06-17 65° 83° 2994 1837 842 324 156
06-18 62° 73° 3039 1872 868 342 168
06-19 63° 74° 3086 1909 894 360 182
06-20 65° 78° 3135 1948 924 381 198
06-21 71° 84° 3191 1994 959 409 220
06-22 74° 85° 3248 2041 996 438 245
06-23 73° 85° 3305 2088 1034 467 269
06-24 68° 79° 3356 2129 1065 491 287
06-25 64° 71° 3402 2165 1091 509 300
06-26 67° 82° 3455 2208 1124 533 320
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 69° 81° 3508 2251 1156 558 340
06-28 66° 73° 3555 2288 1184 578 354
06-29 68° 80° 3607 2330 1216 602 373
06-30 70° 79° 3660 2373 1248 626 393
07-01 69° 77° 3711 2414 1280 649 411
07-02 69° 80° 3764 2457 1312 674 431
07-03 70° 79° 3816 2499 1345 699 450
07-04 71° 82° 3871 2544 1379 725 471
07-05 72° 85° 3927 2590 1416 754 495
07-06 66° 78° 3977 2630 1446 775 512
07-07 65° 73° 4024 2667 1473 794 526
07-08 67° 76° 4073 2706 1502 816 542
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 69° 76° 4124 2747 1532 838 560
07-10 66° 75° 4172 2785 1561 859 575
07-11 69° 82° 4226 2829 1594 884 595
07-12 70° 79° 4278 2871 1626 908 615
07-13 68° 77° 4328 2911 1656 930 632
07-14 65° 79° 4378 2951 1686 952 649
07-15 69° 80° 4430 2993 1719 977 668
07-16 72° 83° 4486 3039 1754 1004 691
07-17 64° 74° 4533 3076 1782 1024 705
07-18 62° 75° 4580 3113 1808 1042 719
07-19 70° 78° 4632 3155 1840 1066 738
07-20 68° 73° 4680 3193 1869 1087 753
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 67° 74° 4729 3232 1897 1107 769
07-22 68° 77° 4779 3272 1928 1130 786
07-23 71° 85° 4835 3318 1964 1158 809
07-24 73° 83° 4891 3364 2000 1186 832
07-25 71° 76° 4943 3406 2031 1209 851
07-26 71° 79° 4996 3449 2064 1234 871
07-27 73° 79° 5050 3493 2098 1260 892
07-28 74° 83° 5106 3539 2135 1289 915
07-29 72° 85° 5163 3586 2171 1317 939
07-30 69° 77° 5214 3627 2202 1340 957
07-31 69° 73° 5262 3665 2231 1361 972
08-01 67° 72° 5310 3703 2259 1381 987
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 64° 74° 5358 3741 2286 1400 1001
08-03 64° 74° 5405 3778 2313 1419 1015
08-04 67° 75° 5453 3816 2342 1440 1031
08-05 68° 76° 5503 3856 2372 1462 1048
08-06 68° 78° 5554 3897 2403 1485 1066
08-07 71° 82° 5609 3942 2437 1511 1088
08-08 73° 83° 5665 3988 2473 1539 1111
08-09 74° 85° 5723 4036 2511 1569 1136
08-10 73° 82° 5779 4082 2547 1597 1159
08-11 74° 83° 5835 4128 2584 1626 1182
08-12 72° 79° 5888 4171 2617 1651 1202
08-13 71° 78° 5941 4214 2650 1675 1222
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 68° 77° 5992 4255 2680 1698 1239
08-15 70° 83° 6046 4299 2715 1724 1261
08-16 74° 85° 6103 4346 2752 1754 1285
08-17 71° 77° 6156 4389 2784 1778 1305
08-18 72° 80° 6210 4433 2818 1804 1326
08-19 72° 75° 6261 4474 2850 1828 1344
08-20 69° 73° 6310 4513 2879 1849 1360
08-21 68° 74° 6359 4552 2908 1870 1376
08-22 67° 77° 6409 4592 2938 1891 1393
08-23 68° 79° 6461 4634 2969 1915 1411
08-24 61° 72° 6505 4668 2994 1931 1423
08-25 57° 69° 6546 4699 3015 1945 1431
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 58° 72° 6589 4732 3038 1960 1441
08-27 57° 75° 6633 4766 3062 1976 1452
08-28 63° 72° 6679 4802 3087 1993 1465
08-29 60° 66° 6720 4833 3108 2006 1472
08-30 64° 71° 6765 4868 3134 2023 1485
08-31 59° 72° 6808 4901 3157 2039 1495
09-01 63° 73° 6854 4937 3183 2057 1508
09-02 62° 73° 6900 4973 3209 2074 1521
09-03 61° 70° 6943 5006 3232 2090 1531
09-04 51° 66° 6980 5033 3248 2098 1534
09-05 59° 65° 7019 5062 3268 2110 1541
09-06 52° 66° 7056 5089 3285 2119 1545
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 52° 66° 7093 5116 3302 2127 1549
09-08 53° 69° 7132 5145 3321 2138 1555
09-09 55° 72° 7174 5177 3342 2152 1563
09-10 61° 73° 7219 5212 3368 2169 1576
09-11 64° 70° 7264 5247 3393 2186 1588
09-12 63° 75° 7311 5284 3419 2205 1602
09-13 64° 75° 7359 5322 3447 2225 1616
09-14 66° 74° 7407 5360 3475 2245 1632
09-15 65° 73° 7454 5397 3503 2264 1646
09-16 64° 74° 7501 5434 3529 2283 1660
09-17 63° 74° 7548 5471 3556 2302 1673
09-18 63° 76° 7595 5508 3584 2322 1688
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 68° 77° 7646 5549 3614 2344 1706
09-20 67° 73° 7694 5587 3643 2364 1721
09-21 68° 77° 7744 5627 3673 2387 1738
09-22 67° 76° 7794 5667 3702 2408 1755
09-23 67° 73° 7842 5705 3730 2428 1770
09-24 64° 70° 7887 5740 3755 2445 1782
09-25 61° 70° 7931 5774 3779 2461 1792
09-26 59° 77° 7977 5810 3805 2479 1805
09-27 62° 80° 8026 5849 3834 2500 1821
09-28 65° 72° 8072 5885 3861 2518 1835
09-29 62° 76° 8119 5922 3888 2537 1849
09-30 63° 74° 8165 5958 3914 2556 1862
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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