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Crabgrass/Annual Bluegrass Preemergence Timer (GDD 32)
forecast for Mon, Dec. 15. 2025

 
  

Downers Grove, IL

        

Generously Supported By:



Tabular Data

Daily GDD accumulation for various base temperature models in 2024 & 2023

2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 23° 34° 7 0 0 0 0
02-16 12° 28° 7 0 0 0 0
02-17 0° 10° 7 0 0 0 0
02-18 -7° 14° 7 0 0 0 0
02-19 4° 16° 7 0 0 0 0
02-20 2° 24° 7 0 0 0 0
02-21 9° 28° 7 0 0 0 0
02-22 13° 35° 9 0 0 0 0
02-23 22° 46° 21 2 0 0 0
02-24 39° 55° 46 17 5 0 0
02-25 37° 55° 70 31 9 0 0
02-26 35° 52° 91 42 10 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 35° 49° 111 52 10 0 0
02-28 33° 57° 134 65 13 0 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 21° 37° 141 65 13 0 0
03-02 16° 37° 145 65 13 0 0
03-03 27° 47° 161 70 13 0 0
03-04 44° 48° 184 84 17 0 0
03-05 29° 50° 202 91 17 0 0
03-06 28° 40° 214 93 17 0 0
03-07 32° 37° 226 96 17 0 0
03-08 29° 49° 243 103 17 0 0
03-09 32° 58° 266 116 20 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 37° 69° 297 137 31 3 0
03-11 36° 58° 322 152 36 3 0
03-12 35° 55° 345 165 39 3 0
03-13 32° 63° 371 181 44 3 0
03-14 46° 79° 412 211 65 16 8
03-15 45° 69° 446 236 80 22 9
03-16 30° 43° 461 241 80 22 9
03-17 26° 53° 478 248 80 22 9
03-18 44° 73° 515 275 97 31 13
03-19 39° 56° 541 290 102 31 13
03-20 30° 43° 555 295 102 31 13
03-21 30° 60° 578 308 105 31 13
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 35° 52° 600 320 107 31 13
03-23 35° 50° 620 330 107 31 13
03-24 34° 49° 640 339 107 31 13
03-25 30° 51° 658 348 107 31 13
03-26 29° 53° 678 357 107 31 13
03-27 42° 53° 703 373 113 31 13
03-28 48° 79° 745 405 134 45 22
03-29 54° 70° 785 434 154 57 29
03-30 46° 75° 823 462 172 67 34
03-31 35° 47° 842 471 172 67 34
04-01 30° 46° 858 477 172 67 34
04-02 40° 70° 891 501 186 72 34
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 43° 62° 922 521 196 75 34
04-04 38° 48° 943 532 197 75 34
04-05 41° 53° 968 547 202 75 34
04-06 34° 50° 988 557 202 75 34
04-07 30° 44° 1003 562 202 75 34
04-08 25° 44° 1015 565 202 75 34
04-09 32° 42° 1030 570 202 75 34
04-10 38° 45° 1050 579 202 75 34
04-11 35° 53° 1072 591 204 75 34
04-12 34° 62° 1097 607 210 75 34
04-13 52° 65° 1134 633 226 83 37
04-14 53° 64° 1170 660 243 91 41
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 39° 55° 1195 675 248 91 41
04-16 33° 53° 1216 686 249 91 41
04-17 38° 64° 1246 705 258 93 41
04-18 57° 77° 1291 741 284 110 53
04-19 45° 67° 1325 764 297 116 54
04-20 47° 61° 1357 786 309 120 54
04-21 48° 61° 1389 809 322 124 54
04-22 40° 74° 1424 834 337 132 56
04-23 57° 78° 1470 869 362 149 69
04-24 53° 78° 1514 903 386 165 79
04-25 50° 60° 1547 926 399 170 79
04-26 43° 54° 1573 943 406 170 79
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 36° 70° 1604 964 417 173 79
04-28 53° 84° 1651 1000 443 191 93
04-29 54° 75° 1693 1033 466 206 103
04-30 46° 63° 1726 1055 478 211 103
05-01 52° 68° 1764 1084 497 221 108
05-02 47° 59° 1795 1104 507 223 108
05-03 44° 56° 1822 1122 515 223 108
05-04 46° 58° 1852 1142 525 225 108
05-05 48° 60° 1884 1164 537 229 108
05-06 46° 78° 1924 1194 557 241 115
05-07 50° 75° 1965 1225 578 254 122
05-08 46° 58° 1995 1245 588 256 122
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 38° 67° 2026 1265 598 259 122
05-10 47° 74° 2064 1294 617 269 128
05-11 43° 73° 2100 1320 633 277 131
05-12 50° 80° 2144 1353 656 293 141
05-13 63° 79° 2193 1392 685 314 158
05-14 58° 81° 2240 1430 713 333 172
05-15 62° 94° 2296 1476 749 361 195
05-16 62° 86° 2349 1518 781 386 215
05-17 53° 70° 2388 1548 801 397 221
05-18 47° 66° 2423 1572 815 404 223
05-19 44° 53° 2449 1589 822 404 223
05-20 50° 57° 2481 1611 834 408 223
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 49° 54° 2511 1630 843 409 223
05-22 48° 57° 2541 1651 854 411 223
05-23 42° 65° 2573 1672 865 415 223
05-24 43° 66° 2605 1695 878 420 223
05-25 52° 66° 2642 1722 895 429 227
05-26 44° 68° 2677 1746 909 435 228
05-27 52° 69° 2715 1775 928 445 233
05-28 55° 63° 2752 1802 945 455 238
05-29 53° 72° 2793 1832 965 467 245
05-30 52° 75° 2834 1863 986 480 253
05-31 51° 66° 2871 1890 1003 489 257
06-01 43° 70° 2905 1915 1018 495 258
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 47° 85° 2949 1949 1042 511 269
06-03 67° 86° 3004 1993 1076 538 291
06-04 58° 73° 3047 2027 1100 554 302
06-05 54° 71° 3088 2058 1121 566 309
06-06 60° 78° 3135 2095 1148 585 323
06-07 56° 78° 3181 2130 1173 603 336
06-08 59° 80° 3228 2168 1201 622 350
06-09 55° 71° 3269 2198 1221 635 358
06-10 54° 78° 3313 2232 1245 651 369
06-11 63° 91° 3368 2278 1281 678 391
06-12 65° 83° 3420 2320 1313 702 410
06-13 62° 72° 3465 2355 1338 719 422
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 61° 76° 3511 2391 1364 738 436
06-15 58° 82° 3559 2429 1392 757 450
06-16 61° 89° 3612 2472 1425 782 470
06-17 72° 91° 3672 2521 1464 814 497
06-18 68° 82° 3724 2564 1497 838 516
06-19 66° 83° 3777 2606 1529 863 536
06-20 68° 85° 3831 2651 1564 889 557
06-21 77° 94° 3895 2704 1607 925 588
06-22 79° 94° 3959 2759 1652 962 620
06-23 78° 95° 4024 2814 1697 998 651
06-24 77° 93° 4087 2867 1740 1033 681
06-25 73° 88° 4146 2915 1778 1064 707
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 76° 94° 4209 2968 1821 1099 737
06-27 76° 87° 4268 3018 1861 1131 764
06-28 68° 89° 4325 3064 1897 1159 787
06-29 72° 91° 4384 3114 1937 1191 814
06-30 74° 89° 4444 3164 1977 1222 840
07-01 70° 86° 4501 3210 2013 1251 864
07-02 69° 89° 4558 3258 2051 1280 888
07-03 70° 92° 4617 3307 2090 1311 914
07-04 75° 90° 4678 3357 2130 1344 942
07-05 74° 93° 4739 3408 2171 1377 970
07-06 69° 85° 4794 3454 2207 1404 992
07-07 65° 84° 4847 3497 2240 1429 1012
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 67° 85° 4901 3541 2274 1456 1034
07-09 70° 83° 4956 3585 2308 1482 1055
07-10 67° 86° 5010 3629 2342 1508 1076
07-11 70° 89° 5067 3677 2380 1538 1101
07-12 69° 82° 5121 3721 2414 1563 1121
07-13 67° 81° 5173 3763 2446 1588 1141
07-14 62° 87° 5226 3806 2479 1612 1160
07-15 68° 91° 5284 3853 2516 1642 1185
07-16 74° 90° 5343 3903 2556 1674 1212
07-17 64° 76° 5391 3941 2584 1693 1226
07-18 57° 83° 5439 3979 2612 1714 1242
07-19 73° 83° 5495 4025 2648 1741 1264
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 67° 76° 5545 4064 2677 1763 1281
07-21 63° 84° 5596 4106 2709 1786 1299
07-22 67° 87° 5651 4151 2744 1813 1321
07-23 72° 93° 5711 4201 2784 1846 1349
07-24 72° 93° 5772 4252 2825 1878 1376
07-25 75° 82° 5829 4298 2861 1907 1400
07-26 72° 83° 5884 4344 2897 1934 1422
07-27 74° 88° 5943 4393 2936 1965 1448
07-28 77° 89° 6004 4444 2977 1999 1477
07-29 71° 91° 6064 4493 3016 2030 1503
07-30 70° 82° 6118 4537 3050 2056 1524
07-31 67° 76° 6167 4576 3079 2077 1540
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 61° 75° 6213 4613 3106 2095 1553
08-02 57° 79° 6259 4649 3132 2113 1566
08-03 58° 80° 6306 4685 3158 2132 1580
08-04 62° 82° 6356 4725 3188 2154 1597
08-05 62° 84° 6407 4766 3219 2177 1615
08-06 64° 87° 6460 4810 3253 2202 1635
08-07 71° 90° 6519 4858 3291 2233 1661
08-08 73° 91° 6578 4908 3331 2264 1687
08-09 75° 93° 6640 4960 3373 2298 1716
08-10 77° 88° 6700 5010 3413 2331 1744
08-11 74° 88° 6760 5059 3452 2362 1770
08-12 73° 86° 6817 5106 3489 2391 1794
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 69° 84° 6871 5151 3524 2417 1815
08-14 65° 83° 6923 5193 3556 2441 1834
08-15 66° 90° 6980 5239 3592 2470 1858
08-16 74° 95° 7042 5291 3634 2504 1887
08-17 71° 81° 7096 5335 3668 2530 1908
08-18 72° 84° 7152 5381 3704 2558 1931
08-19 71° 77° 7204 5423 3736 2582 1950
08-20 66° 75° 7252 5462 3765 2603 1966
08-21 63° 74° 7299 5499 3792 2621 1979
08-22 63° 79° 7348 5538 3821 2642 1995
08-23 66° 82° 7400 5580 3853 2666 2014
08-24 56° 71° 7442 5612 3875 2680 2023
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 53° 68° 7481 5640 3893 2691 2029
08-26 50° 72° 7520 5670 3913 2702 2035
08-27 52° 75° 7561 5701 3934 2715 2043
08-28 61° 76° 7608 5737 3960 2734 2057
08-29 53° 70° 7648 5767 3980 2746 2064
08-30 60° 72° 7692 5801 4004 2762 2075
08-31 53° 76° 7734 5834 4027 2776 2084
09-01 56° 77° 7778 5868 4051 2793 2096
09-02 55° 80° 7824 5904 4077 2810 2108
09-03 58° 71° 7867 5936 4099 2825 2118
09-04 48° 66° 7901 5961 4114 2832 2120
09-05 56° 66° 7940 5990 4133 2842 2125
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 46° 66° 7974 6014 4147 2849 2127
09-07 44° 67° 8008 6037 4160 2854 2127
09-08 45° 72° 8044 6064 4177 2862 2130
09-09 47° 75° 8083 6093 4196 2874 2137
09-10 59° 82° 8132 6131 4224 2894 2152
09-11 62° 80° 8181 6171 4254 2915 2168
09-12 58° 84° 8230 6210 4283 2936 2184
09-13 64° 77° 8278 6248 4311 2957 2200
09-14 64° 83° 8329 6289 4342 2980 2218
09-15 61° 85° 8380 6330 4373 3003 2236
09-16 59° 83° 8430 6369 4402 3024 2252
09-17 57° 83° 8478 6407 4430 3044 2267
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 59° 87° 8529 6448 4461 3067 2285
09-19 64° 89° 8583 6493 4496 3093 2306
09-20 66° 77° 8632 6532 4525 3115 2323
09-21 66° 81° 8684 6574 4557 3138 2341
09-22 65° 81° 8735 6615 4588 3161 2359
09-23 66° 78° 8785 6655 4618 3183 2376
09-24 62° 72° 8830 6690 4643 3200 2388
09-25 58° 75° 8874 6724 4667 3217 2400
09-26 55° 83° 8922 6761 4694 3236 2414
09-27 59° 87° 8973 6802 4725 3259 2432
09-28 60° 81° 9021 6840 4753 3279 2447
09-29 58° 89° 9072 6882 4785 3303 2466
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 60° 83° 9122 6922 4815 3324 2482
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 31° 43° 15 5 0 0 0
02-16 27° 31° 22 5 0 0 0
02-17 12° 28° 22 5 0 0 0
02-18 21° 45° 33 6 0 0 0
02-19 22° 50° 47 10 0 0 0
02-20 27° 57° 67 20 0 0 0
02-21 44° 64° 99 42 12 4 0
02-22 45° 60° 129 62 22 6 0
02-23 27° 51° 146 69 22 6 0
02-24 19° 34° 151 69 22 6 0
02-25 31° 60° 175 83 26 6 0
02-26 38° 71° 207 106 39 11 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 54° 72° 248 137 60 24 8
02-28 21° 55° 264 143 60 24 8
02-29 18° 44° 274 143 60 24 8
03-01 30° 46° 290 149 60 24 8
03-02 33° 59° 314 163 64 24 8
03-03 43° 72° 350 189 80 32 11
03-04 52° 71° 390 219 99 44 17
03-05 40° 58° 417 236 106 44 17
03-06 37° 48° 437 246 107 44 17
03-07 36° 48° 457 256 107 44 17
03-08 42° 45° 479 267 108 44 17
03-09 33° 44° 495 274 108 44 17
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 30° 47° 511 280 108 44 17
03-11 30° 67° 538 297 115 44 17
03-12 47° 71° 575 324 132 52 21
03-13 48° 70° 612 351 149 61 25
03-14 44° 67° 645 374 162 66 25
03-15 37° 52° 668 387 165 66 25
03-16 39° 56° 694 402 171 66 25
03-17 31° 41° 707 406 171 66 25
03-18 26° 34° 716 406 171 66 25
03-19 30° 57° 737 418 172 66 25
03-20 30° 46° 753 423 172 66 25
03-21 25° 40° 763 424 172 66 25
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 31° 39° 776 427 172 66 25
03-23 29° 38° 788 429 172 66 25
03-24 31° 49° 806 437 172 66 25
03-25 45° 61° 837 458 183 70 25
03-26 34° 54° 859 470 185 70 25
03-27 29° 42° 872 473 185 70 25
03-28 29° 50° 890 481 185 70 25
03-29 32° 55° 911 492 187 70 25
03-30 41° 60° 940 511 195 70 25
03-31 38° 54° 964 524 199 70 25
04-01 41° 47° 986 537 201 70 25
04-02 36° 49° 1006 547 201 70 25
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 33° 37° 1019 550 201 70 25
04-04 36° 41° 1036 556 201 70 25
04-05 37° 47° 1056 566 202 70 25
04-06 31° 52° 1075 576 202 70 25
04-07 38° 51° 1098 588 204 70 25
04-08 47° 70° 1134 615 221 79 29
04-09 50° 62° 1168 639 235 85 30
04-10 43° 67° 1201 662 248 90 30
04-11 50° 58° 1234 684 260 94 30
04-12 48° 63° 1267 708 273 99 30
04-13 41° 71° 1301 732 288 106 32
04-14 61° 81° 1351 771 317 127 48
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 50° 70° 1388 799 335 137 53
04-16 54° 75° 1431 831 357 151 62
04-17 59° 68° 1472 863 379 165 70
04-18 47° 58° 1503 884 389 167 70
04-19 41° 56° 1529 900 396 167 70
04-20 35° 46° 1548 908 396 167 70
04-21 31° 47° 1565 916 396 167 70
04-22 38° 66° 1595 936 406 169 70
04-23 56° 63° 1632 963 423 179 75
04-24 36° 52° 1654 975 425 179 75
04-25 31° 59° 1677 988 428 179 75
04-26 43° 59° 1706 1006 437 180 75
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 59° 77° 1752 1042 463 198 88
04-28 62° 74° 1798 1079 489 216 101
04-29 58° 69° 1840 1110 511 230 110
04-30 47° 74° 1878 1139 529 240 115
05-01 63° 75° 1925 1176 556 259 130
05-02 54° 77° 1969 1210 580 275 140
05-03 54° 68° 2008 1239 599 286 146
05-04 49° 81° 2051 1272 622 301 156
05-05 52° 64° 2087 1298 638 309 159
05-06 48° 71° 2125 1326 656 319 164
05-07 59° 75° 2170 1361 681 336 176
05-08 53° 80° 2215 1395 706 352 188
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 52° 66° 2251 1422 722 361 191
05-10 47° 67° 2286 1447 737 368 193
05-11 50° 69° 2324 1474 755 378 198
05-12 49° 83° 2368 1508 779 393 209
05-13 63° 81° 2417 1548 808 415 225
05-14 53° 62° 2453 1574 824 423 228
05-15 53° 69° 2492 1603 843 434 234
05-16 52° 74° 2533 1634 864 447 242
05-17 60° 81° 2581 1672 892 467 257
05-18 60° 85° 2632 1713 923 490 275
05-19 64° 78° 2681 1751 952 510 291
05-20 61° 86° 2732 1793 983 534 309
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 62° 89° 2786 1836 1017 560 330
05-22 62° 80° 2835 1876 1046 581 346
05-23 56° 81° 2882 1912 1073 599 360
05-24 64° 77° 2930 1951 1101 620 375
05-25 57° 75° 2974 1985 1125 636 386
05-26 57° 74° 3018 2018 1149 652 397
05-27 58° 73° 3062 2052 1173 667 408
05-28 55° 72° 3103 2084 1194 681 417
05-29 54° 69° 3143 2114 1214 693 423
05-30 45° 71° 3179 2140 1230 701 426
05-31 48° 80° 3221 2172 1252 715 435
06-01 62° 67° 3263 2204 1274 729 444
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 59° 76° 3309 2239 1300 747 457
06-03 58° 87° 3359 2280 1330 769 474
06-04 70° 86° 3415 2326 1366 797 497
06-05 69° 78° 3467 2367 1398 821 516
06-06 63° 77° 3515 2406 1426 841 531
06-07 59° 78° 3562 2442 1453 860 545
06-08 57° 76° 3606 2477 1477 876 556
06-09 54° 79° 3651 2512 1502 893 568
06-10 54° 70° 3691 2542 1522 905 575
06-11 48° 78° 3732 2573 1543 918 583
06-12 66° 91° 3788 2619 1579 946 606
06-13 72° 89° 3847 2668 1618 977 632
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 66° 87° 3902 2712 1653 1004 654
06-15 59° 87° 3953 2753 1684 1027 672
06-16 70° 94° 4013 2804 1724 1059 699
06-17 76° 95° 4077 2857 1768 1095 730
06-18 78° 93° 4140 2911 1811 1130 760
06-19 76° 93° 4203 2964 1854 1165 790
06-20 67° 90° 4259 3010 1890 1193 814
06-21 67° 94° 4318 3058 1929 1224 839
06-22 75° 92° 4379 3110 1970 1257 867
06-23 71° 80° 4433 3154 2004 1283 888
06-24 65° 86° 4487 3197 2038 1309 909
06-25 72° 83° 4542 3243 2073 1336 931
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 71° 86° 4599 3290 2110 1365 955
06-27 61° 74° 4644 3325 2135 1382 967
06-28 63° 75° 4692 3363 2163 1402 982
06-29 72° 88° 4750 3410 2201 1432 1007
06-30 60° 78° 4795 3446 2226 1449 1019
07-01 52° 75° 4837 3477 2248 1462 1028
07-02 66° 85° 4890 3521 2281 1488 1048
07-03 74° 90° 4950 3570 2321 1520 1075
07-04 70° 83° 5004 3615 2355 1546 1096
07-05 70° 82° 5058 3659 2389 1572 1117
07-06 64° 80° 5108 3699 2419 1594 1134
07-07 64° 86° 5161 3742 2452 1619 1154
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 69° 84° 5216 3787 2487 1646 1176
07-09 71° 80° 5270 3830 2521 1671 1197
07-10 67° 83° 5323 3873 2554 1696 1217
07-11 67° 81° 5375 3915 2586 1721 1236
07-12 65° 86° 5428 3959 2619 1746 1256
07-13 68° 91° 5486 4007 2657 1776 1281
07-14 68° 88° 5542 4052 2693 1804 1304
07-15 68° 89° 5599 4099 2730 1833 1328
07-16 69° 84° 5653 4144 2764 1859 1349
07-17 70° 83° 5707 4188 2798 1885 1370
07-18 61° 76° 5753 4224 2824 1903 1384
07-19 57° 80° 5800 4260 2851 1922 1397
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 61° 81° 5849 4300 2880 1943 1413
07-21 65° 84° 5901 4342 2912 1967 1432
07-22 64° 85° 5953 4384 2944 1991 1451
07-23 66° 85° 6007 4428 2978 2017 1472
07-24 66° 76° 6056 4467 3007 2038 1488
07-25 62° 79° 6105 4505 3036 2059 1504
07-26 57° 83° 6152 4543 3063 2078 1518
07-27 61° 85° 6204 4584 3095 2102 1537
07-28 69° 83° 6258 4629 3129 2128 1558
07-29 71° 81° 6312 4673 3163 2154 1579
07-30 69° 91° 6370 4721 3201 2184 1604
07-31 71° 92° 6430 4770 3241 2216 1631
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 73° 86° 6487 4818 3278 2245 1656
08-02 69° 85° 6543 4863 3314 2272 1678
08-03 70° 91° 6601 4912 3352 2303 1703
08-04 70° 90° 6659 4960 3390 2333 1728
08-05 74° 91° 6720 5010 3431 2366 1756
08-06 67° 75° 6768 5049 3459 2386 1771
08-07 63° 79° 6817 5088 3488 2407 1787
08-08 60° 83° 6867 5128 3518 2429 1804
08-09 60° 73° 6911 5162 3542 2445 1815
08-10 54° 75° 6954 5194 3565 2460 1825
08-11 55° 79° 6999 5229 3590 2477 1837
08-12 56° 80° 7045 5265 3616 2495 1850
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 60° 84° 7095 5306 3646 2517 1867
08-14 63° 86° 7148 5348 3679 2541 1887
08-15 67° 75° 7196 5387 3707 2562 1902
08-16 67° 85° 7250 5431 3741 2588 1924
08-17 68° 80° 7302 5473 3773 2612 1942
08-18 67° 76° 7352 5512 3803 2634 1959
08-19 63° 74° 7398 5549 3829 2652 1972
08-20 57° 71° 7440 5581 3851 2666 1981
08-21 52° 75° 7482 5613 3873 2680 1990
08-22 51° 78° 7525 5645 3896 2694 2000
08-23 54° 82° 7570 5681 3921 2712 2012
08-24 60° 90° 7623 5724 3954 2737 2033
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 71° 91° 7683 5773 3994 2769 2059
08-26 77° 95° 7747 5828 4038 2805 2090
08-27 76° 98° 7812 5883 4083 2842 2122
08-28 72° 83° 7867 5928 4118 2869 2144
08-29 70° 86° 7924 5974 4155 2897 2168
08-30 72° 84° 7979 6020 4190 2925 2190
08-31 61° 84° 8030 6060 4221 2947 2208
09-01 63° 77° 8078 6098 4249 2967 2223
09-02 56° 75° 8121 6132 4272 2983 2233
09-03 53° 78° 8165 6165 4296 2998 2244
09-04 53° 84° 8211 6202 4322 3017 2257
09-05 62° 86° 8263 6244 4354 3041 2276
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 58° 73° 8306 6277 4377 3056 2287
09-07 48° 66° 8342 6302 4393 3064 2289
09-08 45° 72° 8378 6329 4409 3072 2293
09-09 54° 80° 8424 6364 4435 3090 2305
09-10 53° 82° 8469 6400 4460 3107 2317
09-11 55° 87° 8518 6439 4489 3128 2333
09-12 59° 88° 8570 6480 4521 3152 2352
09-13 64° 86° 8623 6523 4554 3176 2372
09-14 65° 88° 8677 6568 4588 3203 2393
09-15 65° 89° 8732 6613 4623 3230 2415
09-16 62° 89° 8786 6657 4657 3256 2436
09-17 59° 85° 8836 6697 4687 3278 2453
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 58° 87° 8887 6737 4718 3301 2471
09-19 59° 89° 8939 6780 4750 3325 2490
09-20 71° 91° 8998 6828 4789 3356 2516
09-21 61° 93° 9053 6873 4824 3383 2538
09-22 64° 74° 9100 6910 4851 3401 2552
09-23 59° 65° 9140 6941 4871 3414 2559
09-24 61° 66° 9182 6972 4893 3428 2568
09-25 56° 75° 9225 7006 4916 3443 2578
09-26 54° 76° 9268 7039 4939 3458 2588
09-27 63° 71° 9313 7074 4964 3475 2601
09-28 67° 70° 9360 7111 4991 3494 2614
09-29 67° 72° 9407 7148 5018 3513 2629
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 62° 77° 9455 7186 5046 3533 2643

 

Latest Updates

February 15th, 2025Welcome to the 2025 GDD Tracking Season

Although winter seems very much entrenched in the Great Lakes region with snow and frigid temperatures in the forecast, GDDTracker starts 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. Beyond the spring models, 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 2025!
 

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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