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Crabgrass Germination Prediction (GDD 50)
through Sun, Dec. 14. 2025

 
  

Joliet, 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 26° 35° 8 0 0 0 0
02-16 12° 30° 8 0 0 0 0
02-17 3° 11° 8 0 0 0 0
02-18 -4° 13° 8 0 0 0 0
02-19 6° 17° 8 0 0 0 0
02-20 3° 22° 8 0 0 0 0
02-21 7° 30° 8 0 0 0 0
02-22 12° 36° 11 0 0 0 0
02-23 22° 49° 24 4 0 0 0
02-24 36° 57° 49 18 5 0 0
02-25 34° 55° 71 31 7 0 0
02-26 33° 51° 91 41 7 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 35° 50° 112 51 8 0 0
02-28 31° 59° 135 64 11 0 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 20° 38° 142 64 11 0 0
03-02 15° 38° 146 64 11 0 0
03-03 27° 48° 162 70 11 0 0
03-04 42° 47° 184 82 13 0 0
03-05 30° 51° 202 90 13 0 0
03-06 29° 40° 215 93 13 0 0
03-07 32° 37° 227 95 13 0 0
03-08 29° 49° 244 102 13 0 0
03-09 31° 58° 267 115 16 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 35° 68° 296 134 25 1 0
03-11 37° 55° 320 148 29 1 0
03-12 35° 60° 345 163 34 1 0
03-13 32° 68° 373 181 42 2 0
03-14 49° 79° 415 213 65 16 9
03-15 44° 67° 449 237 78 22 10
03-16 30° 43° 464 242 78 22 10
03-17 26° 52° 480 248 78 22 10
03-18 42° 74° 516 274 94 29 13
03-19 40° 63° 546 294 104 31 13
03-20 30° 42° 560 298 104 31 13
03-21 30° 58° 582 310 106 31 13
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 36° 49° 603 321 106 31 13
03-23 35° 48° 622 330 106 31 13
03-24 34° 50° 642 340 106 31 13
03-25 30° 52° 661 349 106 31 13
03-26 30° 54° 681 359 106 31 13
03-27 42° 52° 706 374 112 31 13
03-28 48° 80° 748 406 134 45 22
03-29 56° 68° 788 436 154 57 29
03-30 46° 76° 827 465 172 67 34
03-31 35° 46° 846 474 172 67 34
04-01 31° 48° 863 481 172 67 34
04-02 42° 70° 897 505 186 73 35
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 42° 63° 928 526 197 76 35
04-04 38° 50° 950 538 199 76 35
04-05 42° 52° 975 553 204 76 35
04-06 36° 49° 995 563 204 76 35
04-07 30° 45° 1010 568 204 76 35
04-08 26° 44° 1023 571 204 76 35
04-09 32° 45° 1040 578 204 76 35
04-10 37° 51° 1062 590 206 76 35
04-11 37° 53° 1085 603 209 76 35
04-12 32° 62° 1110 618 214 76 35
04-13 52° 65° 1146 644 230 84 38
04-14 53° 63° 1182 670 246 92 41
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 43° 57° 1210 688 254 92 41
04-16 32° 56° 1232 700 256 92 41
04-17 41° 64° 1262 720 266 95 41
04-18 58° 77° 1308 756 292 112 54
04-19 46° 67° 1342 780 306 118 55
04-20 49° 66° 1377 805 321 126 57
04-21 49° 62° 1411 829 335 131 57
04-22 40° 74° 1446 854 350 138 60
04-23 54° 76° 1489 887 373 153 70
04-24 51° 81° 1533 921 397 169 81
04-25 50° 64° 1568 946 412 176 83
04-26 44° 56° 1596 964 420 176 83
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 35° 69° 1626 984 430 178 83
04-28 53° 84° 1672 1020 456 197 96
04-29 55° 76° 1716 1054 480 212 106
04-30 47° 64° 1749 1077 493 217 106
05-01 54° 69° 1788 1106 512 229 113
05-02 48° 63° 1822 1130 526 234 113
05-03 45° 57° 1851 1149 535 235 113
05-04 46° 57° 1881 1169 544 237 113
05-05 48° 64° 1914 1192 558 243 114
05-06 46° 76° 1953 1221 577 253 120
05-07 50° 78° 1995 1253 599 267 129
05-08 47° 62° 2028 1276 612 272 129
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 38° 67° 2059 1297 622 275 129
05-10 44° 76° 2096 1324 640 285 134
05-11 43° 77° 2134 1352 658 295 139
05-12 52° 82° 2179 1387 683 312 151
05-13 61° 79° 2228 1426 712 332 166
05-14 60° 82° 2277 1465 741 353 183
05-15 66° 94° 2335 1513 779 383 207
05-16 61° 87° 2387 1555 811 407 226
05-17 54° 69° 2427 1585 831 419 233
05-18 49° 70° 2464 1612 848 428 238
05-19 47° 58° 2495 1633 858 431 238
05-20 51° 61° 2528 1656 872 436 239
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 50° 55° 2559 1677 883 439 239
05-22 49° 59° 2591 1699 895 443 239
05-23 43° 67° 2624 1722 908 448 239
05-24 43° 69° 2658 1746 922 454 240
05-25 53° 65° 2696 1774 939 464 244
05-26 44° 71° 2731 1799 955 472 247
05-27 54° 70° 2771 1829 975 483 254
05-28 55° 64° 2809 1857 993 493 258
05-29 51° 69° 2847 1885 1011 503 263
05-30 52° 75° 2889 1917 1032 517 272
05-31 52° 69° 2927 1945 1051 527 278
06-01 42° 74° 2963 1971 1067 535 281
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 47° 85° 3007 2005 1091 552 292
06-03 65° 89° 3063 2051 1127 579 314
06-04 60° 73° 3107 2085 1151 595 326
06-05 55° 72° 3149 2117 1173 609 334
06-06 63° 80° 3198 2156 1202 630 351
06-07 59° 79° 3245 2193 1229 650 365
06-08 59° 81° 3293 2231 1257 670 380
06-09 53° 74° 3335 2263 1279 683 389
06-10 53° 78° 3379 2297 1303 699 399
06-11 61° 90° 3432 2340 1336 724 420
06-12 64° 85° 3485 2383 1369 749 439
06-13 64° 75° 3532 2420 1396 768 454
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 65° 80° 3582 2460 1426 790 471
06-15 60° 83° 3632 2500 1456 812 487
06-16 63° 86° 3684 2542 1488 836 507
06-17 71° 91° 3743 2591 1527 867 533
06-18 68° 81° 3796 2634 1560 892 552
06-19 66° 82° 3848 2676 1592 916 572
06-20 67° 83° 3901 2719 1625 941 591
06-21 75° 93° 3963 2771 1667 975 620
06-22 77° 93° 4026 2824 1710 1010 650
06-23 76° 93° 4088 2876 1752 1044 680
06-24 75° 94° 4151 2929 1795 1079 709
06-25 73° 89° 4210 2978 1834 1110 735
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 75° 94° 4272 3030 1876 1144 765
06-27 76° 88° 4332 3080 1916 1176 792
06-28 67° 88° 4388 3126 1952 1204 814
06-29 72° 91° 4447 3175 1991 1235 841
06-30 74° 88° 4507 3225 2030 1267 867
07-01 69° 85° 4562 3270 2066 1294 889
07-02 67° 87° 4617 3315 2101 1321 911
07-03 68° 91° 4674 3362 2138 1350 936
07-04 72° 91° 4734 3412 2178 1382 963
07-05 72° 92° 4794 3462 2218 1414 990
07-06 71° 88° 4851 3509 2255 1444 1014
07-07 67° 84° 4905 3553 2289 1469 1035
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 66° 84° 4958 3596 2322 1494 1055
07-09 69° 85° 5013 3641 2357 1521 1077
07-10 66° 88° 5068 3686 2392 1548 1099
07-11 71° 90° 5127 3735 2430 1579 1124
07-12 69° 82° 5180 3778 2464 1604 1145
07-13 68° 81° 5233 3821 2497 1629 1164
07-14 62° 86° 5285 3863 2529 1653 1183
07-15 68° 89° 5341 3909 2565 1682 1207
07-16 73° 91° 5402 3960 2605 1714 1234
07-17 65° 78° 5451 3999 2635 1735 1251
07-18 60° 83° 5500 4038 2664 1756 1267
07-19 72° 82° 5555 4083 2699 1783 1289
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 70° 76° 5606 4124 2730 1806 1306
07-21 66° 84° 5659 4167 2762 1831 1326
07-22 68° 85° 5713 4211 2797 1857 1348
07-23 70° 92° 5772 4260 2836 1888 1374
07-24 73° 91° 5832 4310 2876 1920 1401
07-25 73° 82° 5888 4356 2912 1948 1424
07-26 71° 81° 5942 4400 2946 1974 1445
07-27 75° 89° 6002 4450 2986 2006 1472
07-28 76° 90° 6063 4501 3027 2039 1499
07-29 71° 89° 6121 4549 3065 2069 1524
07-30 71° 83° 6176 4594 3100 2096 1547
07-31 67° 76° 6226 4634 3130 2118 1563
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 61° 77° 6272 4670 3156 2136 1577
08-02 57° 79° 6318 4706 3182 2154 1590
08-03 58° 80° 6365 4743 3209 2173 1604
08-04 62° 82° 6415 4783 3239 2195 1621
08-05 63° 83° 6466 4824 3270 2218 1639
08-06 63° 86° 6519 4867 3303 2243 1658
08-07 71° 90° 6577 4915 3341 2273 1683
08-08 72° 89° 6635 4963 3379 2303 1709
08-09 72° 91° 6695 5013 3419 2335 1736
08-10 75° 89° 6755 5063 3459 2367 1762
08-11 73° 86° 6812 5110 3496 2396 1787
08-12 72° 86° 6869 5157 3533 2425 1811
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 68° 85° 6924 5202 3568 2452 1832
08-14 65° 85° 6977 5245 3601 2477 1852
08-15 67° 90° 7033 5291 3637 2505 1876
08-16 74° 93° 7095 5343 3679 2539 1905
08-17 70° 86° 7151 5389 3715 2567 1927
08-18 72° 87° 7208 5436 3752 2596 1952
08-19 71° 80° 7262 5480 3786 2622 1972
08-20 67° 77° 7312 5520 3816 2644 1989
08-21 63° 77° 7360 5558 3843 2664 2004
08-22 61° 80° 7408 5596 3872 2684 2020
08-23 65° 83° 7460 5638 3904 2709 2039
08-24 57° 72° 7503 5671 3927 2723 2048
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 53° 69° 7541 5699 3945 2734 2054
08-26 50° 73° 7581 5729 3965 2745 2061
08-27 51° 75° 7622 5760 3986 2758 2068
08-28 61° 78° 7669 5797 4013 2777 2083
08-29 53° 73° 7711 5829 4035 2791 2091
08-30 60° 74° 7756 5864 4060 2808 2103
08-31 56° 75° 7799 5897 4083 2823 2114
09-01 56° 77° 7844 5932 4108 2840 2126
09-02 56° 80° 7890 5968 4134 2858 2139
09-03 57° 74° 7933 6001 4157 2873 2149
09-04 48° 66° 7968 6026 4172 2880 2151
09-05 55° 67° 8008 6056 4191 2892 2157
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 44° 66° 8041 6079 4205 2897 2157
09-07 43° 67° 8074 6102 4218 2902 2157
09-08 44° 71° 8109 6127 4233 2909 2160
09-09 46° 75° 8148 6156 4252 2920 2166
09-10 59° 81° 8196 6194 4280 2940 2181
09-11 62° 82° 8246 6234 4310 2962 2198
09-12 58° 84° 8295 6273 4339 2983 2214
09-13 66° 79° 8345 6313 4369 3005 2231
09-14 63° 86° 8398 6356 4401 3030 2250
09-15 62° 87° 8450 6398 4434 3054 2270
09-16 59° 84° 8499 6437 4463 3076 2286
09-17 56° 85° 8548 6476 4492 3096 2302
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 58° 88° 8599 6517 4523 3119 2320
09-19 64° 88° 8653 6561 4557 3145 2341
09-20 66° 78° 8703 6601 4587 3167 2358
09-21 65° 80° 8754 6642 4618 3190 2376
09-22 65° 81° 8805 6683 4649 3213 2394
09-23 65° 79° 8855 6723 4679 3235 2411
09-24 63° 74° 8901 6759 4705 3253 2424
09-25 58° 75° 8945 6793 4729 3269 2435
09-26 54° 81° 8991 6829 4755 3287 2448
09-27 58° 86° 9041 6869 4785 3309 2465
09-28 58° 84° 9090 6908 4814 3331 2481
09-29 58° 88° 9142 6950 4846 3354 2500
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 60° 84° 9192 6990 4876 3376 2517
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 32° 44° 16 6 0 0 0
02-16 25° 32° 22 6 0 0 0
02-17 12° 25° 22 6 0 0 0
02-18 20° 44° 32 6 0 0 0
02-19 22° 49° 46 10 0 0 0
02-20 29° 56° 67 21 1 0 0
02-21 42° 63° 97 41 11 3 0
02-22 44° 57° 126 60 20 3 0
02-23 29° 51° 144 67 20 3 0
02-24 19° 35° 149 67 20 3 0
02-25 29° 60° 172 80 23 3 0
02-26 37° 72° 204 103 35 7 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 52° 72° 244 132 55 19 7
02-28 23° 51° 259 137 55 19 7
02-29 17° 45° 268 137 55 19 7
03-01 26° 47° 283 142 55 19 7
03-02 32° 60° 307 156 59 19 7
03-03 42° 72° 342 181 74 26 9
03-04 51° 71° 381 210 93 38 15
03-05 41° 61° 410 229 102 38 15
03-06 38° 51° 432 242 104 38 15
03-07 36° 48° 452 251 104 38 15
03-08 42° 50° 476 265 108 38 15
03-09 33° 44° 493 272 108 38 15
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 30° 47° 509 279 108 38 15
03-11 27° 67° 534 294 113 38 15
03-12 42° 71° 569 318 128 45 17
03-13 46° 72° 606 345 145 54 21
03-14 45° 68° 641 370 160 60 22
03-15 38° 54° 665 384 164 60 22
03-16 38° 59° 691 401 170 60 22
03-17 33° 42° 707 406 170 60 22
03-18 26° 34° 715 406 170 60 22
03-19 29° 58° 737 418 172 60 22
03-20 29° 47° 753 424 172 60 22
03-21 24° 43° 764 425 172 60 22
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 33° 47° 782 433 172 60 22
03-23 30° 38° 794 436 172 60 22
03-24 30° 51° 813 444 172 60 22
03-25 46° 62° 845 466 184 65 22
03-26 35° 54° 868 479 187 65 22
03-27 29° 43° 882 483 187 65 22
03-28 28° 52° 900 491 187 65 22
03-29 34° 60° 925 506 192 65 22
03-30 43° 63° 955 526 202 67 22
03-31 39° 56° 981 542 208 67 22
04-01 42° 51° 1006 557 213 67 22
04-02 36° 55° 1029 570 216 67 22
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 34° 37° 1042 574 216 67 22
04-04 36° 41° 1059 580 216 67 22
04-05 37° 47° 1079 590 216 67 22
04-06 31° 55° 1099 601 217 67 22
04-07 39° 54° 1124 615 221 67 22
04-08 46° 72° 1160 642 238 76 26
04-09 49° 62° 1194 665 252 82 27
04-10 42° 66° 1226 687 264 86 27
04-11 49° 59° 1258 709 276 90 27
04-12 47° 62° 1291 732 289 95 27
04-13 41° 72° 1326 757 303 101 29
04-14 60° 82° 1374 796 332 122 44
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 51° 70° 1413 824 350 132 50
04-16 56° 77° 1457 859 375 149 62
04-17 59° 68° 1499 890 396 162 70
04-18 45° 65° 1532 913 410 168 70
04-19 41° 56° 1559 930 416 168 70
04-20 35° 47° 1578 939 416 168 70
04-21 31° 47° 1595 946 416 168 70
04-22 37° 66° 1624 966 426 169 70
04-23 52° 60° 1659 990 440 175 71
04-24 36° 53° 1682 1003 443 175 71
04-25 28° 60° 1704 1015 445 175 71
04-26 45° 58° 1733 1035 455 177 71
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 60° 76° 1779 1070 480 195 84
04-28 62° 75° 1826 1107 507 213 98
04-29 59° 69° 1867 1139 529 227 106
04-30 48° 74° 1906 1168 548 238 112
05-01 60° 75° 1952 1203 573 256 125
05-02 54° 80° 1997 1238 598 273 137
05-03 53° 68° 2035 1267 617 283 143
05-04 48° 80° 2078 1299 639 298 152
05-05 52° 66° 2115 1327 657 307 156
05-06 47° 76° 2155 1356 676 318 163
05-07 60° 75° 2200 1391 702 336 175
05-08 53° 80° 2245 1426 726 353 187
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 53° 67° 2283 1454 744 362 192
05-10 47° 67° 2317 1478 758 369 193
05-11 50° 70° 2355 1507 777 379 198
05-12 48° 82° 2399 1540 800 394 209
05-13 61° 80° 2447 1578 828 415 224
05-14 56° 67° 2487 1608 848 426 231
05-15 54° 70° 2526 1638 868 438 238
05-16 52° 72° 2566 1667 888 450 244
05-17 59° 80° 2614 1705 915 469 259
05-18 60° 84° 2664 1745 945 492 276
05-19 64° 79° 2714 1785 975 514 293
05-20 63° 87° 2767 1828 1008 538 313
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 64° 90° 2821 1873 1043 565 335
05-22 63° 78° 2870 1911 1071 586 350
05-23 55° 81° 2916 1947 1097 603 363
05-24 63° 77° 2963 1985 1125 623 378
05-25 56° 76° 3008 2019 1149 640 389
05-26 55° 76° 3051 2053 1173 655 400
05-27 58° 74° 3096 2087 1197 671 411
05-28 54° 74° 3138 2119 1219 685 420
05-29 55° 71° 3178 2150 1240 698 428
05-30 46° 73° 3216 2177 1257 707 432
05-31 50° 80° 3258 2210 1280 722 441
06-01 60° 69° 3301 2242 1302 736 451
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 59° 78° 3347 2279 1329 755 465
06-03 58° 87° 3398 2319 1360 778 482
06-04 70° 85° 3454 2365 1395 805 505
06-05 69° 77° 3505 2406 1426 829 523
06-06 63° 79° 3554 2445 1455 850 539
06-07 59° 80° 3601 2482 1482 869 553
06-08 57° 79° 3647 2519 1509 887 567
06-09 54° 80° 3692 2554 1534 904 579
06-10 55° 71° 3733 2585 1555 917 587
06-11 48° 78° 3774 2616 1576 930 595
06-12 65° 91° 3830 2661 1612 958 617
06-13 71° 91° 3889 2711 1651 989 643
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 65° 86° 3943 2754 1684 1015 664
06-15 60° 84° 3993 2794 1714 1036 681
06-16 67° 93° 4050 2842 1752 1066 706
06-17 76° 94° 4113 2895 1795 1101 735
06-18 76° 91° 4175 2946 1836 1134 764
06-19 75° 91° 4235 2997 1877 1167 792
06-20 69° 91° 4293 3045 1915 1197 817
06-21 66° 92° 4350 3092 1952 1226 841
06-22 76° 91° 4412 3143 1993 1260 869
06-23 71° 83° 4467 3188 2028 1287 891
06-24 65° 86° 4520 3232 2062 1312 911
06-25 71° 81° 4574 3276 2096 1338 933
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 71° 85° 4630 3322 2132 1366 955
06-27 61° 74° 4676 3357 2157 1384 968
06-28 62° 76° 4723 3394 2184 1403 982
06-29 72° 87° 4781 3442 2222 1432 1007
06-30 59° 78° 4825 3476 2246 1449 1018
07-01 51° 75° 4866 3507 2267 1462 1026
07-02 62° 83° 4917 3548 2298 1484 1044
07-03 72° 86° 4974 3595 2335 1514 1068
07-04 69° 82° 5027 3639 2369 1539 1088
07-05 68° 81° 5079 3681 2401 1563 1108
07-06 63° 81° 5129 3720 2430 1585 1124
07-07 63° 87° 5182 3763 2463 1610 1144
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 69° 85° 5237 3808 2498 1637 1166
07-09 69° 77° 5288 3850 2530 1660 1184
07-10 67° 84° 5341 3893 2563 1685 1205
07-11 68° 82° 5395 3936 2596 1710 1225
07-12 66° 86° 5448 3980 2630 1736 1246
07-13 68° 89° 5505 4026 2666 1765 1269
07-14 68° 88° 5561 4072 2702 1793 1292
07-15 68° 89° 5617 4118 2739 1821 1315
07-16 68° 83° 5670 4162 2772 1846 1336
07-17 67° 80° 5722 4204 2804 1870 1354
07-18 60° 74° 5767 4239 2829 1887 1367
07-19 55° 78° 5812 4273 2853 1904 1378
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 58° 79° 5858 4310 2880 1922 1391
07-21 63° 81° 5909 4350 2910 1944 1409
07-22 64° 83° 5960 4391 2941 1968 1427
07-23 65° 84° 6013 4434 2974 1992 1447
07-24 65° 77° 6062 4473 3003 2014 1463
07-25 64° 79° 6112 4513 3033 2035 1480
07-26 56° 79° 6157 4549 3059 2053 1493
07-27 60° 82° 6206 4588 3088 2074 1509
07-28 69° 82° 6260 4631 3121 2099 1529
07-29 70° 83° 6314 4676 3156 2126 1550
07-30 69° 89° 6371 4722 3192 2155 1574
07-31 69° 87° 6427 4768 3228 2183 1597
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 71° 85° 6483 4814 3264 2211 1620
08-02 70° 83° 6538 4859 3299 2237 1642
08-03 69° 90° 6595 4906 3337 2267 1666
08-04 69° 88° 6652 4953 3373 2295 1690
08-05 73° 91° 6712 5003 3413 2328 1717
08-06 69° 78° 6763 5045 3445 2351 1736
08-07 66° 78° 6813 5084 3474 2373 1752
08-08 60° 81° 6861 5123 3503 2393 1768
08-09 59° 72° 6905 5157 3527 2409 1779
08-10 53° 73° 6947 5188 3548 2422 1787
08-11 53° 77° 6989 5221 3571 2437 1797
08-12 55° 77° 7033 5255 3595 2453 1808
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 57° 83° 7081 5293 3623 2473 1823
08-14 61° 84° 7132 5334 3654 2496 1840
08-15 67° 76° 7181 5373 3683 2517 1857
08-16 68° 85° 7236 5417 3717 2544 1878
08-17 67° 78° 7287 5458 3748 2566 1896
08-18 66° 77° 7336 5497 3778 2588 1912
08-19 62° 75° 7383 5534 3804 2607 1926
08-20 57° 72° 7425 5567 3827 2621 1936
08-21 51° 75° 7466 5598 3848 2634 1944
08-22 52° 76° 7509 5630 3870 2648 1953
08-23 54° 80° 7554 5665 3895 2665 1965
08-24 60° 89° 7606 5708 3928 2690 1985
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 70° 90° 7664 5755 3965 2720 2009
08-26 74° 93° 7725 5807 4007 2753 2038
08-27 73° 96° 7788 5859 4050 2788 2067
08-28 71° 83° 7843 5904 4084 2815 2089
08-29 70° 88° 7899 5951 4121 2843 2113
08-30 72° 86° 7957 5998 4158 2872 2137
08-31 63° 82° 8007 6038 4188 2895 2154
09-01 62° 78° 8055 6076 4216 2915 2169
09-02 55° 75° 8098 6109 4239 2930 2179
09-03 52° 76° 8140 6142 4262 2944 2188
09-04 52° 82° 8185 6176 4286 2961 2200
09-05 60° 86° 8236 6218 4318 2984 2219
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 58° 73° 8280 6251 4341 3000 2229
09-07 49° 66° 8315 6277 4357 3007 2232
09-08 44° 71° 8351 6302 4372 3015 2234
09-09 50° 79° 8393 6335 4395 3029 2243
09-10 51° 81° 8437 6368 4418 3045 2254
09-11 54° 85° 8485 6406 4446 3064 2269
09-12 58° 87° 8535 6447 4477 3087 2287
09-13 64° 84° 8587 6489 4509 3111 2306
09-14 65° 88° 8642 6533 4543 3138 2327
09-15 65° 88° 8697 6578 4578 3165 2349
09-16 60° 88° 8749 6621 4611 3189 2368
09-17 57° 86° 8799 6660 4640 3211 2385
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 56° 87° 8849 6700 4670 3232 2402
09-19 57° 89° 8900 6741 4701 3256 2420
09-20 68° 89° 8957 6788 4738 3284 2444
09-21 58° 91° 9009 6830 4771 3309 2463
09-22 65° 72° 9056 6867 4797 3327 2477
09-23 60° 67° 9097 6898 4818 3341 2485
09-24 62° 66° 9139 6930 4840 3355 2494
09-25 55° 74° 9181 6963 4863 3369 2503
09-26 53° 78° 9225 6996 4886 3385 2514
09-27 64° 73° 9271 7032 4913 3403 2527
09-28 63° 70° 9316 7067 4937 3420 2539
09-29 67° 72° 9363 7104 4964 3439 2553
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 63° 76° 9410 7141 4992 3458 2567

 

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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