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.

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Crabgrass/Annual Bluegrass Preemergence Timer (GDD 32)
through Sun, Dec. 14. 2025

 
  

IA

        

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 17° 27° 0 0 0 0 0
02-16 3° 15° 0 0 0 0 0
02-17 -3° 4° 0 0 0 0 0
02-18 -11° 3° 0 0 0 0 0
02-19 -3° 8° 0 0 0 0 0
02-20 -7° 13° 0 0 0 0 0
02-21 -2° 20° 0 0 0 0 0
02-22 13° 36° 3 0 0 0 0
02-23 24° 60° 22 10 0 0 0
02-24 41° 61° 51 28 9 1 0
02-25 32° 60° 75 42 13 1 0
02-26 38° 54° 99 57 17 1 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 37° 55° 123 71 21 1 0
02-28 34° 59° 148 85 25 1 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 20° 32° 151 85 25 1 0
03-02 16° 48° 161 85 25 1 0
03-03 33° 63° 187 101 31 1 0
03-04 39° 56° 213 117 37 1 0
03-05 26° 34° 221 117 37 1 0
03-06 21° 43° 231 117 37 1 0
03-07 31° 38° 243 119 37 1 0
03-08 25° 51° 259 125 37 1 0
03-09 29° 63° 283 139 41 1 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 35° 79° 317 163 56 7 2
03-11 36° 57° 342 178 60 7 2
03-12 30° 69° 369 195 68 7 2
03-13 38° 76° 405 221 83 15 4
03-14 53° 80° 449 255 107 31 16
03-15 34° 52° 470 266 108 31 16
03-16 25° 47° 485 271 108 31 16
03-17 33° 77° 517 293 121 36 16
03-18 44° 78° 556 322 140 47 21
03-19 33° 56° 578 334 142 47 21
03-20 28° 49° 595 341 142 47 21
03-21 38° 59° 621 357 148 47 21
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 26° 61° 643 369 150 47 21
03-23 39° 54° 667 383 154 47 21
03-24 29° 54° 687 393 154 47 21
03-25 36° 58° 712 408 159 47 21
03-26 30° 64° 737 423 164 47 21
03-27 47° 70° 773 449 181 55 25
03-28 50° 80° 817 483 204 70 35
03-29 56° 76° 861 517 228 86 46
03-30 35° 61° 887 533 234 86 46
03-31 31° 49° 905 541 234 86 46
04-01 33° 48° 923 549 234 86 46
04-02 46° 68° 959 575 249 94 48
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 36° 53° 981 587 252 94 48
04-04 36° 47° 1001 597 252 94 48
04-05 36° 47° 1020 606 252 94 48
04-06 24° 57° 1039 615 252 94 48
04-07 33° 45° 1056 622 252 94 48
04-08 23° 54° 1073 629 252 94 48
04-09 40° 66° 1104 650 263 97 48
04-10 42° 61° 1133 669 273 99 48
04-11 45° 57° 1162 688 282 99 48
04-12 37° 71° 1195 711 294 104 48
04-13 54° 78° 1239 745 318 120 59
04-14 45° 64° 1271 767 331 124 59
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 38° 63° 1299 785 339 125 59
04-16 38° 75° 1334 810 353 131 61
04-17 58° 76° 1378 844 378 148 73
04-18 49° 66° 1414 870 394 156 75
04-19 39° 57° 1440 886 400 156 75
04-20 43° 52° 1466 902 405 156 75
04-21 45° 68° 1500 926 419 162 77
04-22 52° 70° 1539 955 438 173 83
04-23 56° 77° 1584 990 463 190 95
04-24 56° 72° 1626 1022 485 204 104
04-25 52° 62° 1661 1047 500 211 106
04-26 42° 65° 1692 1068 511 214 106
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 48° 66° 1727 1093 526 221 108
04-28 59° 81° 1775 1131 554 241 123
04-29 48° 73° 1813 1159 573 251 128
04-30 45° 67° 1848 1184 587 258 129
05-01 53° 66° 1885 1211 605 267 134
05-02 45° 57° 1914 1230 614 268 134
05-03 44° 61° 1945 1251 624 271 134
05-04 40° 71° 1979 1275 638 277 135
05-05 46° 73° 2016 1302 656 286 139
05-06 47° 76° 2055 1331 675 297 146
05-07 53° 80° 2100 1366 699 314 157
05-08 52° 73° 2141 1397 720 327 165
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 46° 75° 2179 1425 739 337 171
05-10 51° 86° 2226 1462 765 356 184
05-11 55° 83° 2273 1499 792 375 198
05-12 49° 83° 2316 1532 816 390 209
05-13 57° 83° 2365 1571 844 411 224
05-14 60° 85° 2415 1611 875 433 242
05-15 64° 80° 2465 1651 905 455 259
05-16 55° 74° 2508 1684 927 470 268
05-17 48° 66° 2543 1709 943 477 270
05-18 39° 74° 2578 1734 957 484 272
05-19 53° 65° 2615 1761 975 493 277
05-20 50° 63° 2650 1786 989 500 278
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 48° 59° 2681 1807 1001 503 278
05-22 43° 61° 2711 1827 1011 505 278
05-23 43° 67° 2745 1851 1024 511 279
05-24 54° 67° 2783 1879 1043 521 284
05-25 56° 67° 2823 1909 1062 533 291
05-26 49° 69° 2860 1936 1080 542 295
05-27 55° 65° 2898 1964 1098 552 300
05-28 55° 66° 2937 1993 1116 563 306
05-29 52° 69° 2975 2021 1134 573 311
05-30 52° 79° 3019 2055 1158 589 322
05-31 54° 83° 3065 2091 1185 607 335
06-01 58° 82° 3113 2129 1212 627 350
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 59° 87° 3164 2170 1243 650 367
06-03 57° 75° 3208 2204 1267 666 379
06-04 52° 74° 3249 2235 1288 679 387
06-05 55° 77° 3293 2269 1312 695 398
06-06 63° 79° 3342 2308 1341 716 413
06-07 65° 71° 3388 2344 1367 734 427
06-08 58° 71° 3430 2376 1389 748 436
06-09 55° 69° 3470 2406 1409 760 443
06-10 50° 85° 3515 2441 1435 777 455
06-11 61° 94° 3571 2487 1470 805 478
06-12 66° 86° 3625 2531 1504 831 499
06-13 63° 84° 3677 2573 1536 855 518
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 66° 89° 3732 2618 1572 882 540
06-15 67° 83° 3786 2662 1605 908 561
06-16 66° 88° 3841 2707 1640 935 583
06-17 65° 78° 3890 2746 1670 956 599
06-18 64° 77° 3939 2785 1698 977 614
06-19 60° 86° 3989 2825 1729 999 632
06-20 70° 91° 4048 2874 1767 1030 658
06-21 80° 96° 4114 2930 1813 1068 691
06-22 77° 94° 4177 2983 1857 1103 721
06-23 73° 92° 4238 3034 1897 1136 749
06-24 70° 78° 4290 3076 1929 1160 768
06-25 71° 88° 4347 3123 1967 1189 792
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 71° 88° 4405 3171 2004 1219 817
06-27 64° 84° 4457 3213 2037 1243 836
06-28 69° 90° 4515 3261 2074 1273 861
06-29 71° 83° 4570 3306 2109 1300 883
06-30 69° 83° 4624 3350 2143 1326 904
07-01 64° 84° 4676 3392 2175 1350 923
07-02 64° 82° 4727 3433 2207 1373 941
07-03 68° 92° 4785 3481 2244 1403 966
07-04 73° 90° 4844 3530 2284 1434 992
07-05 72° 84° 4901 3577 2320 1463 1015
07-06 69° 86° 4956 3622 2356 1490 1038
07-07 66° 86° 5011 3667 2390 1517 1059
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 66° 83° 5063 3709 2423 1541 1079
07-09 66° 87° 5118 3754 2457 1568 1101
07-10 70° 87° 5175 3801 2494 1597 1125
07-11 68° 78° 5226 3842 2525 1620 1143
07-12 66° 79° 5276 3882 2556 1642 1160
07-13 60° 81° 5325 3921 2584 1663 1176
07-14 64° 87° 5378 3964 2618 1688 1196
07-15 68° 87° 5434 4010 2653 1716 1219
07-16 70° 83° 5488 4054 2688 1742 1240
07-17 61° 73° 5533 4089 2713 1759 1252
07-18 60° 81° 5582 4128 2742 1780 1268
07-19 69° 86° 5638 4174 2778 1808 1291
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 71° 86° 5694 4220 2814 1836 1314
07-21 74° 83° 5751 4267 2850 1865 1338
07-22 72° 88° 5809 4315 2888 1895 1363
07-23 76° 91° 5870 4366 2929 1928 1391
07-24 70° 83° 5924 4410 2964 1954 1412
07-25 71° 83° 5980 4456 2999 1982 1434
07-26 73° 86° 6037 4503 3036 2011 1459
07-27 71° 92° 6097 4553 3076 2043 1485
07-28 68° 90° 6153 4599 3113 2071 1509
07-29 70° 92° 6212 4648 3151 2102 1535
07-30 68° 80° 6264 4690 3184 2126 1554
07-31 65° 76° 6313 4729 3212 2147 1570
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 58° 74° 6357 4763 3236 2163 1581
08-02 59° 77° 6403 4799 3262 2181 1594
08-03 57° 75° 6447 4833 3287 2197 1605
08-04 61° 77° 6494 4870 3314 2216 1619
08-05 60° 82° 6543 4909 3343 2237 1635
08-06 67° 82° 6595 4951 3375 2261 1654
08-07 70° 84° 6650 4996 3410 2288 1676
08-08 72° 90° 6709 5045 3449 2319 1702
08-09 73° 83° 6765 5091 3485 2347 1725
08-10 71° 83° 6820 5136 3520 2374 1747
08-11 66° 80° 6871 5177 3551 2397 1765
08-12 69° 83° 6925 5221 3585 2423 1786
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 63° 81° 6975 5261 3614 2445 1803
08-14 64° 84° 7027 5303 3646 2469 1822
08-15 68° 91° 7085 5351 3684 2499 1846
08-16 74° 93° 7146 5402 3725 2532 1875
08-17 73° 94° 7207 5453 3767 2565 1903
08-18 73° 87° 7265 5501 3804 2595 1928
08-19 70° 87° 7322 5548 3841 2624 1952
08-20 69° 86° 7377 5593 3877 2651 1974
08-21 66° 82° 7429 5635 3909 2675 1993
08-22 61° 83° 7479 5675 3938 2697 2010
08-23 63° 74° 7525 5711 3965 2715 2023
08-24 54° 73° 7567 5743 3986 2729 2032
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 49° 72° 7605 5771 4005 2739 2037
08-26 47° 75° 7645 5801 4024 2751 2044
08-27 57° 81° 7691 5837 4051 2769 2057
08-28 56° 82° 7739 5875 4078 2789 2071
08-29 58° 83° 7787 5913 4107 2809 2087
08-30 61° 83° 7838 5954 4137 2832 2104
08-31 66° 76° 7886 5992 4166 2852 2120
09-01 63° 77° 7934 6030 4194 2872 2135
09-02 54° 80° 7979 6065 4219 2889 2147
09-03 54° 71° 8020 6096 4239 2902 2155
09-04 44° 72° 8056 6122 4255 2910 2158
09-05 51° 66° 8093 6149 4272 2919 2162
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 44° 67° 8126 6172 4285 2924 2162
09-07 42° 74° 8162 6198 4301 2932 2165
09-08 50° 80° 8205 6231 4325 2947 2175
09-09 58° 78° 8251 6267 4350 2965 2188
09-10 58° 84° 8300 6306 4379 2986 2204
09-11 58° 88° 8351 6347 4410 3009 2221
09-12 65° 87° 8404 6390 4444 3034 2242
09-13 66° 97° 8464 6440 4484 3066 2269
09-14 67° 91° 8521 6487 4521 3095 2293
09-15 69° 91° 8579 6535 4559 3125 2318
09-16 67° 88° 8635 6581 4594 3153 2341
09-17 65° 77° 8684 6620 4623 3174 2357
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 63° 75° 8731 6657 4650 3193 2371
09-19 64° 79° 8780 6696 4680 3214 2387
09-20 59° 74° 8825 6731 4704 3231 2399
09-21 56° 79° 8870 6766 4730 3248 2411
09-22 63° 85° 8922 6808 4762 3272 2430
09-23 61° 73° 8968 6844 4787 3290 2443
09-24 60° 79° 9015 6881 4814 3309 2457
09-25 53° 80° 9059 6915 4839 3325 2468
09-26 55° 87° 9109 6955 4868 3347 2484
09-27 57° 86° 9158 6994 4897 3368 2501
09-28 53° 85° 9205 7031 4925 3387 2515
09-29 60° 88° 9257 7073 4956 3411 2534
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 57° 85° 9306 7112 4985 3432 2550
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 27° 43° 13 3 0 0 0
02-16 14° 29° 13 3 0 0 0
02-17 7° 32° 13 3 0 0 0
02-18 23° 42° 24 4 0 0 0
02-19 19° 57° 39 9 0 0 0
02-20 27° 64° 63 23 4 0 0
02-21 40° 63° 93 43 13 1 0
02-22 41° 64° 123 63 24 4 0
02-23 31° 55° 144 74 25 4 0
02-24 24° 52° 160 80 25 4 0
02-25 31° 65° 187 97 31 4 0
02-26 35° 78° 221 121 46 10 1
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 17° 61° 238 128 46 10 1
02-28 9° 32° 238 128 46 10 1
02-29 19° 57° 254 134 46 10 1
03-01 32° 55° 276 146 47 10 1
03-02 31° 69° 304 164 55 11 1
03-03 48° 78° 345 195 76 24 10
03-04 39° 46° 366 206 77 24 10
03-05 29° 56° 386 216 77 24 10
03-06 28° 58° 407 227 78 24 10
03-07 36° 55° 431 241 82 24 10
03-08 32° 44° 447 247 82 24 10
03-09 23° 47° 460 250 82 24 10
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 21° 58° 478 258 82 24 10
03-11 42° 75° 515 285 99 33 13
03-12 49° 68° 551 311 115 41 16
03-13 41° 71° 585 335 129 47 17
03-14 46° 57° 615 355 139 48 17
03-15 37° 57° 639 369 143 48 17
03-16 40° 53° 663 383 148 48 17
03-17 27° 39° 675 385 148 48 17
03-18 21° 37° 682 385 148 48 17
03-19 29° 65° 707 400 152 48 17
03-20 31° 46° 723 406 152 48 17
03-21 27° 50° 739 412 152 48 17
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 30° 43° 754 417 152 48 17
03-23 22° 37° 762 417 152 48 17
03-24 33° 48° 780 425 152 48 17
03-25 47° 63° 813 448 165 53 17
03-26 28° 51° 830 456 165 53 17
03-27 25° 41° 841 456 165 53 17
03-28 27° 58° 861 467 166 53 17
03-29 37° 68° 892 488 177 56 17
03-30 39° 59° 919 504 183 56 17
03-31 39° 59° 946 522 191 56 17
04-01 44° 48° 970 535 194 56 17
04-02 35° 48° 989 545 194 56 17
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 36° 53° 1012 557 197 56 17
04-04 31° 55° 1033 569 198 56 17
04-05 28° 57° 1054 579 199 56 17
04-06 37° 60° 1080 596 206 56 17
04-07 45° 66° 1114 620 219 62 18
04-08 43° 67° 1147 643 232 67 18
04-09 37° 67° 1177 663 242 69 18
04-10 41° 72° 1212 687 257 76 20
04-11 45° 60° 1243 708 268 79 20
04-12 41° 66° 1274 729 279 82 20
04-13 40° 83° 1313 759 298 93 26
04-14 58° 86° 1364 799 329 116 44
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 49° 74° 1403 829 348 127 50
04-16 61° 67° 1445 861 370 141 59
04-17 53° 65° 1482 887 387 150 63
04-18 47° 52° 1509 905 395 150 63
04-19 33° 57° 1532 918 397 150 63
04-20 33° 48° 1551 926 397 150 63
04-21 31° 53° 1570 936 397 150 63
04-22 38° 71° 1603 958 410 155 63
04-23 49° 68° 1640 985 427 163 67
04-24 41° 66° 1671 1006 438 167 67
04-25 50° 63° 1706 1031 453 173 68
04-26 49° 64° 1740 1055 467 179 70
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 57° 74° 1783 1088 490 195 80
04-28 59° 68° 1824 1120 511 208 88
04-29 48° 65° 1858 1144 526 214 89
04-30 46° 74° 1897 1172 544 224 95
05-01 49° 65° 1932 1197 559 232 97
05-02 51° 61° 1966 1222 574 238 98
05-03 41° 72° 2001 1246 588 245 100
05-04 50° 61° 2035 1270 602 250 101
05-05 41° 65° 2066 1291 613 253 101
05-06 52° 73° 2106 1322 633 266 108
05-07 54° 73° 2148 1353 655 279 116
05-08 56° 77° 2192 1388 680 296 128
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 50° 66° 2228 1414 695 304 131
05-10 47° 75° 2268 1443 715 315 137
05-11 49° 79° 2310 1475 737 329 146
05-12 55° 84° 2357 1512 764 349 161
05-13 60° 68° 2399 1545 786 363 170
05-14 57° 73° 2442 1577 809 377 180
05-15 53° 74° 2484 1609 831 391 188
05-16 61° 76° 2530 1645 857 410 202
05-17 55° 81° 2576 1681 883 428 215
05-18 62° 87° 2629 1724 916 452 234
05-19 57° 74° 2672 1758 939 468 245
05-20 63° 82° 2723 1798 970 490 263
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 60° 81° 2771 1837 999 511 278
05-22 53° 73° 2812 1868 1019 524 286
05-23 55° 78° 2857 1903 1044 541 298
05-24 59° 73° 2901 1937 1068 557 309
05-25 48° 77° 2942 1967 1089 570 317
05-26 61° 78° 2989 2005 1116 589 331
05-27 55° 77° 3033 2039 1140 605 342
05-28 54° 74° 3075 2070 1162 619 351
05-29 51° 74° 3115 2101 1182 631 358
05-30 56° 77° 3160 2135 1207 647 369
05-31 62° 80° 3209 2174 1236 668 385
06-01 64° 79° 3258 2213 1265 690 402
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 62° 82° 3308 2253 1295 712 419
06-03 70° 88° 3365 2300 1332 741 443
06-04 68° 83° 3419 2344 1366 766 463
06-05 55° 84° 3466 2382 1393 786 478
06-06 60° 81° 3515 2420 1422 806 493
06-07 56° 81° 3562 2457 1449 825 507
06-08 66° 79° 3612 2497 1479 847 525
06-09 56° 83° 3659 2535 1507 867 539
06-10 55° 76° 3703 2569 1530 883 550
06-11 59° 89° 3755 2611 1563 907 569
06-12 64° 90° 3811 2656 1598 934 591
06-13 73° 90° 3870 2705 1637 965 617
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 62° 89° 3923 2749 1670 991 638
06-15 66° 84° 3976 2792 1703 1016 658
06-16 68° 91° 4034 2839 1741 1046 683
06-17 76° 92° 4096 2892 1783 1080 712
06-18 76° 89° 4157 2942 1824 1112 739
06-19 66° 73° 4204 2979 1851 1132 754
06-20 65° 82° 4256 3021 1883 1155 772
06-21 73° 88° 4314 3070 1921 1186 798
06-22 77° 88° 4375 3120 1962 1218 825
06-23 66° 88° 4430 3165 1997 1246 848
06-24 73° 95° 4492 3217 2039 1280 877
06-25 76° 92° 4554 3269 2081 1314 906
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 69° 87° 4610 3316 2117 1342 929
06-27 64° 79° 4660 3355 2147 1364 946
06-28 69° 79° 4712 3397 2179 1388 965
06-29 64° 79° 4762 3437 2209 1409 981
06-30 56° 76° 4805 3471 2232 1425 992
07-01 59° 74° 4850 3505 2257 1442 1004
07-02 64° 79° 4899 3545 2287 1463 1020
07-03 63° 84° 4951 3586 2318 1487 1039
07-04 68° 82° 5004 3630 2352 1512 1059
07-05 63° 77° 5052 3668 2380 1532 1074
07-06 59° 84° 5102 3707 2409 1553 1091
07-07 65° 82° 5153 3749 2440 1577 1109
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 62° 81° 5203 3788 2470 1598 1125
07-09 64° 82° 5254 3829 2501 1621 1143
07-10 66° 80° 5304 3870 2532 1644 1161
07-11 62° 82° 5355 3910 2562 1667 1179
07-12 63° 85° 5407 3953 2594 1691 1198
07-13 71° 90° 5466 4002 2633 1722 1224
07-14 78° 92° 5529 4055 2676 1757 1254
07-15 72° 95° 5591 4106 2718 1791 1283
07-16 70° 77° 5642 4148 2750 1814 1301
07-17 64° 79° 5692 4187 2779 1836 1318
07-18 57° 78° 5737 4223 2804 1853 1330
07-19 59° 81° 5785 4260 2832 1873 1345
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 64° 73° 5831 4297 2859 1891 1358
07-21 61° 81° 5881 4336 2888 1912 1374
07-22 63° 81° 5931 4376 2918 1934 1391
07-23 64° 84° 5983 4418 2950 1958 1410
07-24 67° 87° 6037 4463 2984 1985 1432
07-25 69° 83° 6091 4507 3018 2011 1453
07-26 72° 89° 6150 4555 3057 2042 1479
07-27 71° 88° 6207 4603 3095 2071 1503
07-28 69° 90° 6265 4650 3132 2100 1527
07-29 71° 88° 6322 4698 3170 2130 1552
07-30 66° 83° 6375 4740 3202 2155 1572
07-31 68° 90° 6432 4788 3239 2184 1596
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 70° 84° 6487 4833 3274 2211 1618
08-02 69° 87° 6543 4879 3310 2239 1641
08-03 70° 91° 6602 4927 3349 2269 1666
08-04 71° 95° 6663 4978 3390 2302 1695
08-05 73° 94° 6725 5030 3432 2336 1723
08-06 63° 82° 6775 5070 3462 2358 1741
08-07 59° 80° 6822 5108 3490 2378 1755
08-08 63° 75° 6870 5145 3517 2397 1769
08-09 54° 72° 6911 5176 3538 2410 1777
08-10 51° 77° 6953 5208 3560 2424 1786
08-11 57° 77° 6998 5243 3585 2441 1798
08-12 62° 69° 7041 5276 3608 2457 1809
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 65° 75° 7089 5314 3636 2477 1824
08-14 66° 80° 7140 5355 3667 2499 1842
08-15 70° 85° 7195 5401 3702 2527 1864
08-16 68° 85° 7250 5445 3737 2553 1885
08-17 65° 81° 7300 5486 3768 2576 1903
08-18 63° 82° 7351 5527 3798 2599 1921
08-19 62° 80° 7400 5566 3828 2620 1937
08-20 57° 76° 7445 5600 3852 2636 1948
08-21 62° 76° 7492 5637 3879 2656 1963
08-22 57° 77° 7537 5672 3904 2673 1975
08-23 57° 82° 7584 5710 3932 2692 1989
08-24 66° 85° 7638 5753 3965 2718 2010
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 73° 93° 7699 5804 4006 2750 2038
08-26 74° 99° 7763 5859 4050 2787 2069
08-27 76° 93° 7826 5911 4093 2821 2098
08-28 69° 87° 7882 5957 4129 2850 2122
08-29 70° 92° 7941 6007 4168 2881 2148
08-30 66° 79° 7992 6047 4199 2904 2166
08-31 58° 83° 8040 6086 4227 2924 2181
09-01 61° 76° 8086 6122 4253 2942 2194
09-02 51° 76° 8128 6153 4275 2955 2202
09-03 53° 79° 8171 6187 4298 2971 2213
09-04 53° 82° 8217 6222 4324 2989 2226
09-05 63° 78° 8265 6261 4352 3009 2241
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 54° 72° 8306 6292 4374 3022 2249
09-07 48° 71° 8344 6319 4391 3032 2254
09-08 48° 76° 8384 6350 4411 3044 2261
09-09 52° 84° 8430 6385 4437 3061 2273
09-10 58° 84° 8479 6424 4466 3082 2289
09-11 62° 86° 8531 6466 4498 3106 2308
09-12 59° 86° 8581 6507 4528 3129 2326
09-13 61° 79° 8629 6544 4556 3149 2341
09-14 68° 81° 8682 6587 4589 3173 2360
09-15 65° 88° 8736 6631 4623 3200 2382
09-16 64° 86° 8789 6674 4656 3224 2401
09-17 65° 87° 8842 6718 4689 3250 2422
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 65° 87° 8897 6762 4724 3276 2443
09-19 68° 88° 8953 6809 4760 3305 2467
09-20 61° 90° 9007 6852 4794 3330 2487
09-21 64° 87° 9061 6896 4828 3356 2508
09-22 56° 72° 9103 6928 4850 3371 2518
09-23 50° 71° 9142 6957 4869 3381 2523
09-24 55° 74° 9184 6990 4891 3396 2533
09-25 51° 78° 9227 7022 4914 3410 2542
09-26 51° 80° 9270 7056 4938 3426 2553
09-27 53° 80° 9315 7090 4962 3443 2565
09-28 58° 86° 9365 7130 4992 3465 2582
09-29 56° 84° 9413 7169 5021 3485 2597
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 54° 85° 9461 7206 5048 3505 2612

 

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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