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Black Turfgrass Ataenius Egg Laying (GDD 50)
through Mon, Dec. 8. 2025

 
  

Saint Clair Shor, MI

        

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 21° 33° 5 0 0 0 0
02-16 22° 30° 9 0 0 0 0
02-17 10° 22° 9 0 0 0 0
02-18 4° 17° 9 0 0 0 0
02-19 3° 18° 9 0 0 0 0
02-20 12° 22° 9 0 0 0 0
02-21 19° 31° 12 0 0 0 0
02-22 20° 31° 15 0 0 0 0
02-23 23° 35° 22 0 0 0 0
02-24 32° 52° 42 10 0 0 0
02-25 40° 56° 68 26 6 0 0
02-26 30° 40° 81 29 6 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 35° 45° 99 37 6 0 0
02-28 31° 56° 120 48 7 0 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 22° 42° 130 48 7 0 0
03-02 18° 29° 132 48 7 0 0
03-03 23° 40° 141 48 7 0 0
03-04 35° 51° 162 59 8 0 0
03-05 38° 57° 187 74 13 0 0
03-06 28° 37° 197 74 13 0 0
03-07 27° 41° 209 76 13 0 0
03-08 22° 38° 218 76 13 0 0
03-09 32° 56° 239 88 15 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 35° 64° 267 106 23 0 0
03-11 31° 60° 290 119 26 0 0
03-12 27° 46° 305 124 26 0 0
03-13 27° 55° 324 133 26 0 0
03-14 33° 70° 353 152 36 1 0
03-15 57° 72° 396 185 58 16 10
03-16 34° 60° 421 200 63 16 10
03-17 28° 45° 436 204 63 16 10
03-18 35° 67° 465 223 73 17 10
03-19 59° 72° 508 257 96 33 20
03-20 34° 64° 535 274 103 33 20
03-21 27° 53° 553 282 103 33 20
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 30° 49° 571 289 103 33 20
03-23 22° 38° 579 289 103 33 20
03-24 34° 44° 596 297 103 33 20
03-25 28° 45° 611 301 103 33 20
03-26 26° 43° 624 304 103 33 20
03-27 24° 57° 642 312 103 33 20
03-28 41° 64° 673 333 113 35 20
03-29 60° 68° 715 365 135 49 29
03-30 48° 66° 750 390 150 56 31
03-31 39° 58° 776 407 157 56 31
04-01 27° 41° 788 408 157 56 31
04-02 35° 50° 809 419 158 56 31
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 47° 65° 843 443 172 62 32
04-04 38° 48° 865 455 173 62 32
04-05 43° 49° 889 469 178 62 32
04-06 35° 46° 907 478 178 62 32
04-07 29° 48° 924 484 178 62 32
04-08 23° 39° 933 484 178 62 32
04-09 22° 46° 945 486 178 62 32
04-10 33° 37° 958 490 178 62 32
04-11 33° 50° 978 500 178 62 32
04-12 29° 55° 999 510 178 62 32
04-13 37° 58° 1024 525 183 62 32
04-14 48° 74° 1063 554 202 73 38
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 42° 54° 1089 571 209 73 38
04-16 36° 54° 1112 583 211 73 38
04-17 30° 61° 1136 597 215 73 38
04-18 49° 82° 1179 630 238 89 49
04-19 52° 71° 1218 660 258 100 55
04-20 41° 55° 1244 676 264 100 55
04-21 48° 75° 1284 705 283 112 62
04-22 45° 65° 1317 729 297 117 62
04-23 48° 77° 1358 759 317 130 70
04-24 47° 83° 1401 792 340 145 80
04-25 53° 75° 1443 824 362 159 89
04-26 43° 62° 1474 845 373 161 89
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 38° 65° 1503 864 382 163 89
04-28 42° 73° 1539 890 398 170 91
04-29 55° 84° 1586 927 425 190 106
04-30 41° 59° 1614 945 433 190 106
05-01 48° 68° 1650 971 449 198 109
05-02 52° 71° 1690 1001 469 210 116
05-03 45° 51° 1716 1017 475 210 116
05-04 43° 51° 1741 1032 480 210 116
05-05 49° 68° 1778 1059 497 218 119
05-06 53° 60° 1812 1083 511 225 120
05-07 50° 76° 1853 1114 532 238 128
05-08 43° 54° 1879 1130 538 238 128
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 37° 64° 1908 1149 547 238 128
05-10 46° 79° 1948 1179 567 250 136
05-11 47° 66° 1982 1203 581 257 137
05-12 45° 79° 2023 1234 602 269 144
05-13 63° 70° 2067 1268 626 286 156
05-14 59° 76° 2113 1304 652 303 168
05-15 60° 82° 2162 1343 681 324 184
05-16 62° 84° 2213 1384 712 347 202
05-17 59° 74° 2257 1418 736 364 214
05-18 53° 63° 2294 1445 753 372 217
05-19 46° 59° 2324 1465 763 374 217
05-20 42° 57° 2351 1482 770 374 217
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 50° 52° 2380 1501 779 375 217
05-22 49° 54° 2410 1521 789 377 217
05-23 41° 55° 2436 1538 796 377 217
05-24 43° 62° 2467 1558 806 379 217
05-25 41° 66° 2498 1579 817 383 217
05-26 45° 70° 2534 1605 833 390 220
05-27 52° 72° 2574 1635 853 402 227
05-28 55° 58° 2608 1659 867 409 228
05-29 53° 67° 2647 1688 886 419 234
05-30 52° 77° 2689 1720 908 434 243
05-31 49° 65° 2724 1745 923 441 245
06-01 43° 68° 2758 1769 937 446 246
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 45° 80° 2798 1799 957 459 253
06-03 55° 88° 2848 1839 987 480 270
06-04 63° 87° 2901 1882 1020 505 290
06-05 57° 66° 2940 1911 1039 517 296
06-06 58° 75° 2985 1946 1064 533 308
06-07 56° 78° 3030 1981 1089 550 320
06-08 59° 77° 3076 2017 1115 568 333
06-09 62° 78° 3123 2055 1143 588 348
06-10 54° 75° 3166 2087 1165 603 357
06-11 56° 87° 3216 2127 1195 624 374
06-12 62° 74° 3262 2163 1221 642 387
06-13 60° 72° 3305 2196 1244 658 398
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 57° 76° 3350 2231 1269 674 409
06-15 57° 80° 3396 2267 1295 693 423
06-16 59° 81° 3445 2306 1324 713 438
06-17 64° 86° 3498 2349 1357 739 458
06-18 68° 80° 3550 2391 1389 763 477
06-19 63° 73° 3596 2427 1415 781 490
06-20 60° 79° 3644 2465 1443 800 505
06-21 67° 91° 3701 2512 1480 829 529
06-22 79° 97° 3767 2568 1526 868 562
06-23 77° 98° 3832 2623 1571 905 595
06-24 78° 95° 3897 2678 1616 942 626
06-25 70° 80° 3951 2722 1650 967 647
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 66° 88° 4006 2767 1685 994 669
06-27 71° 92° 4065 2816 1724 1026 695
06-28 71° 84° 4121 2862 1760 1053 718
06-29 63° 87° 4174 2905 1793 1078 738
06-30 70° 83° 4228 2949 1827 1105 759
07-01 72° 87° 4286 2997 1865 1134 784
07-02 64° 88° 4340 3041 1899 1160 805
07-03 69° 86° 4395 3086 1934 1187 827
07-04 64° 87° 4448 3129 1967 1213 847
07-05 69° 93° 4507 3178 2006 1244 873
07-06 74° 94° 4569 3230 2048 1277 902
07-07 67° 78° 4619 3270 2078 1300 919
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 59° 83° 4668 3309 2107 1321 935
07-09 70° 80° 4721 3352 2140 1346 955
07-10 65° 89° 4776 3397 2175 1373 978
07-11 67° 86° 4831 3442 2210 1400 999
07-12 73° 90° 4891 3492 2250 1431 1026
07-13 71° 87° 4948 3539 2287 1460 1050
07-14 67° 87° 5003 3584 2322 1488 1072
07-15 64° 89° 5058 3629 2357 1514 1094
07-16 71° 84° 5113 3674 2392 1542 1116
07-17 67° 79° 5164 3715 2423 1564 1134
07-18 59° 76° 5209 3751 2449 1582 1147
07-19 57° 83° 5258 3789 2477 1602 1162
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 67° 79° 5309 3830 2508 1625 1180
07-21 60° 77° 5355 3867 2535 1644 1194
07-22 56° 79° 5401 3902 2560 1662 1207
07-23 59° 87° 5452 3944 2592 1685 1225
07-24 73° 96° 5515 3996 2634 1719 1254
07-25 73° 85° 5572 4043 2671 1749 1278
07-26 71° 82° 5627 4088 2706 1775 1300
07-27 74° 91° 5687 4138 2746 1808 1327
07-28 70° 90° 5745 4187 2785 1838 1353
07-29 70° 89° 5803 4234 2822 1867 1377
07-30 65° 86° 5856 4277 2855 1893 1397
07-31 60° 74° 5901 4312 2880 1910 1410
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 58° 77° 5947 4348 2906 1927 1422
08-02 56° 77° 5992 4383 2931 1944 1434
08-03 57° 80° 6038 4419 2957 1962 1447
08-04 60° 82° 6087 4458 2986 1984 1463
08-05 66° 84° 6140 4501 3019 2008 1483
08-06 69° 85° 6195 4546 3054 2035 1505
08-07 67° 85° 6249 4590 3088 2062 1526
08-08 67° 88° 6304 4636 3124 2089 1549
08-09 70° 89° 6362 4683 3161 2119 1573
08-10 70° 92° 6421 4732 3200 2150 1599
08-11 71° 91° 6480 4781 3239 2181 1625
08-12 72° 91° 6540 4831 3279 2212 1652
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 69° 83° 6594 4875 3313 2239 1673
08-14 66° 84° 6647 4918 3346 2264 1693
08-15 66° 86° 6701 4962 3380 2289 1714
08-16 66° 90° 6757 5008 3416 2318 1737
08-17 65° 83° 6809 5050 3448 2342 1756
08-18 59° 78° 6856 5087 3475 2360 1770
08-19 64° 76° 6903 5125 3503 2380 1785
08-20 65° 71° 6950 5161 3529 2398 1798
08-21 65° 75° 6997 5198 3556 2418 1813
08-22 60° 80° 7045 5236 3584 2438 1828
08-23 64° 79° 7095 5276 3614 2459 1844
08-24 57° 77° 7140 5311 3639 2476 1856
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 55° 68° 7179 5340 3658 2488 1862
08-26 50° 71° 7218 5369 3677 2498 1868
08-27 50° 75° 7258 5399 3697 2511 1875
08-28 53° 71° 7298 5429 3717 2523 1882
08-29 49° 68° 7335 5456 3734 2531 1886
08-30 45° 71° 7371 5482 3750 2539 1889
08-31 48° 74° 7410 5511 3769 2550 1895
09-01 52° 77° 7452 5543 3791 2565 1904
09-02 54° 78° 7496 5577 3815 2581 1915
09-03 54° 83° 7543 5614 3842 2599 1929
09-04 54° 67° 7581 5642 3860 2610 1934
09-05 47° 74° 7620 5671 3879 2620 1940
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 53° 66° 7657 5699 3897 2630 1945
09-07 46° 68° 7692 5723 3911 2637 1946
09-08 46° 68° 7727 5748 3926 2644 1948
09-09 47° 76° 7767 5778 3946 2655 1955
09-10 52° 77° 7810 5811 3969 2670 1965
09-11 51° 78° 7852 5843 3991 2685 1974
09-12 54° 78° 7896 5877 4015 2701 1985
09-13 53° 77° 7939 5910 4038 2716 1995
09-14 52° 80° 7983 5945 4063 2732 2007
09-15 59° 80° 8031 5982 4090 2752 2021
09-16 57° 82° 8078 6020 4118 2771 2036
09-17 56° 82° 8125 6056 4144 2790 2049
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 56° 87° 8174 6095 4173 2811 2065
09-19 63° 76° 8222 6133 4201 2830 2080
09-20 59° 77° 8268 6169 4227 2849 2093
09-21 60° 77° 8314 6206 4254 2867 2107
09-22 63° 75° 8362 6243 4281 2886 2121
09-23 60° 76° 8408 6279 4307 2905 2134
09-24 64° 72° 8454 6315 4333 2923 2147
09-25 63° 74° 8500 6352 4360 2941 2161
09-26 56° 81° 8547 6388 4386 2960 2174
09-27 56° 85° 8596 6427 4415 2980 2190
09-28 59° 77° 8642 6463 4441 2998 2203
09-29 53° 80° 8686 6497 4465 3015 2215
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 54° 79° 8731 6532 4490 3031 2226
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 25° 39° 10 0 0 0 0
02-16 24° 31° 16 0 0 0 0
02-17 19° 27° 17 0 0 0 0
02-18 18° 37° 22 0 0 0 0
02-19 20° 38° 29 0 0 0 0
02-20 23° 48° 43 4 0 0 0
02-21 29° 61° 66 17 3 0 0
02-22 36° 53° 88 29 5 0 0
02-23 24° 50° 103 34 5 0 0
02-24 21° 30° 107 34 5 0 0
02-25 25° 50° 123 40 5 0 0
02-26 33° 55° 145 52 8 0 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 45° 73° 182 79 25 9 4
02-28 23° 63° 203 90 26 9 4
02-29 21° 37° 210 90 26 9 4
03-01 26° 47° 224 94 26 9 4
03-02 37° 52° 247 107 28 9 4
03-03 33° 57° 270 120 31 9 4
03-04 42° 73° 306 146 47 17 7
03-05 42° 61° 335 165 56 18 7
03-06 39° 46° 356 176 57 18 7
03-07 39° 51° 379 189 60 18 7
03-08 41° 52° 403 203 64 18 7
03-09 37° 54° 426 216 67 18 7
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 31° 38° 439 219 67 18 7
03-11 27° 56° 458 228 67 18 7
03-12 42° 69° 492 252 81 24 8
03-13 51° 69° 530 280 99 34 12
03-14 44° 57° 558 298 107 34 12
03-15 36° 48° 578 308 108 34 12
03-16 36° 60° 604 324 113 34 12
03-17 32° 43° 620 330 113 34 12
03-18 25° 35° 627 330 113 34 12
03-19 29° 47° 644 336 113 34 12
03-20 25° 39° 654 336 113 34 12
03-21 21° 35° 660 336 113 34 12
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 25° 31° 665 336 113 34 12
03-23 26° 36° 674 336 113 34 12
03-24 21° 39° 682 336 113 34 12
03-25 33° 62° 708 351 119 34 12
03-26 45° 56° 736 370 127 35 12
03-27 31° 45° 753 376 127 35 12
03-28 25° 50° 768 382 127 35 12
03-29 24° 53° 785 388 127 35 12
03-30 35° 41° 801 394 127 35 12
03-31 37° 43° 818 402 127 35 12
04-01 37° 52° 840 414 130 35 12
04-02 40° 48° 863 426 132 35 12
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 38° 50° 885 438 134 35 12
04-04 35° 48° 905 448 134 35 12
04-05 35° 47° 923 457 134 35 12
04-06 39° 57° 950 473 140 35 12
04-07 29° 57° 970 484 141 35 12
04-08 46° 71° 1007 510 157 43 15
04-09 47° 76° 1046 539 176 54 22
04-10 47° 64° 1079 562 190 59 22
04-11 49° 61° 1112 585 202 64 22
04-12 46° 50° 1138 601 209 64 22
04-13 41° 63° 1168 622 219 66 22
04-14 48° 80° 1211 654 241 81 31
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 47° 63° 1244 677 254 86 31
04-16 47° 63° 1277 700 267 91 31
04-17 55° 70° 1317 731 288 103 39
04-18 52° 67° 1355 758 305 113 43
04-19 48° 61° 1387 780 318 117 43
04-20 41° 48° 1409 793 320 117 43
04-21 39° 45° 1430 803 320 117 43
04-22 35° 64° 1457 820 328 117 43
04-23 49° 59° 1489 842 340 121 43
04-24 34° 49° 1509 852 340 121 43
04-25 27° 52° 1526 860 340 121 43
04-26 35° 64° 1554 877 347 121 43
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 53° 81° 1599 912 372 138 56
04-28 59° 77° 1644 948 398 156 68
04-29 57° 82° 1692 985 425 176 83
04-30 58° 73° 1736 1019 449 191 93
05-01 50° 83° 1780 1053 473 208 105
05-02 52° 68° 1818 1081 491 218 110
05-03 58° 69° 1860 1113 513 231 119
05-04 57° 73° 1903 1146 536 247 129
05-05 54° 72° 1944 1177 557 259 137
05-06 49° 66° 1979 1202 573 267 139
05-07 47° 69° 2015 1228 589 275 142
05-08 53° 80° 2059 1263 613 291 153
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 51° 59° 2092 1286 626 296 153
05-10 46° 65° 2126 1309 639 301 154
05-11 51° 56° 2157 1331 651 305 154
05-12 43° 70° 2192 1355 665 311 155
05-13 57° 82° 2240 1393 693 331 170
05-14 56° 69° 2280 1424 714 344 178
05-15 53° 74° 2322 1455 735 357 186
05-16 51° 76° 2363 1486 757 371 195
05-17 61° 72° 2408 1521 782 388 207
05-18 61° 76° 2454 1558 808 406 220
05-19 54° 88° 2504 1597 837 427 236
05-20 60° 87° 2555 1639 869 451 255
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 66° 88° 2611 1684 904 478 277
05-22 72° 89° 2669 1733 943 509 303
05-23 60° 81° 2718 1771 971 530 319
05-24 54° 81° 2764 1807 997 548 331
05-25 66° 83° 2816 1850 1030 572 351
05-26 59° 79° 2863 1887 1057 591 365
05-27 60° 70° 2907 1920 1080 606 375
05-28 57° 73° 2950 1953 1103 621 385
05-29 52° 66° 2986 1980 1120 630 389
05-30 43° 70° 3021 2004 1134 637 390
05-31 45° 76° 3059 2033 1153 647 396
06-01 52° 78° 3103 2066 1176 662 406
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 63° 77° 3151 2104 1204 682 421
06-03 60° 77° 3197 2141 1231 701 435
06-04 61° 87° 3249 2183 1263 725 454
06-05 70° 85° 3304 2228 1298 752 476
06-06 63° 80° 3354 2267 1327 773 492
06-07 61° 69° 3397 2300 1350 789 503
06-08 53° 78° 3440 2334 1374 804 513
06-09 55° 75° 3483 2367 1397 819 523
06-10 53° 67° 3522 2395 1415 829 528
06-11 47° 71° 3559 2422 1433 839 533
06-12 58° 85° 3608 2462 1462 860 549
06-13 71° 92° 3668 2511 1502 892 576
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 63° 79° 3717 2550 1530 913 591
06-15 54° 76° 3760 2583 1553 927 601
06-16 57° 86° 3809 2622 1582 949 617
06-17 70° 94° 3869 2672 1622 980 644
06-18 75° 91° 3930 2723 1663 1014 672
06-19 76° 91° 3991 2775 1705 1047 701
06-20 72° 88° 4049 2823 1743 1077 726
06-21 66° 90° 4105 2869 1779 1105 749
06-22 70° 94° 4165 2918 1818 1137 776
06-23 70° 85° 4220 2964 1854 1164 798
06-24 64° 81° 4271 3004 1884 1187 815
06-25 67° 83° 4324 3048 1918 1212 836
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 68° 80° 4376 3090 1950 1236 855
06-27 58° 72° 4419 3122 1972 1251 865
06-28 57° 77° 4464 3157 1997 1267 876
06-29 67° 87° 4519 3202 2032 1295 899
06-30 61° 78° 4567 3240 2060 1314 913
07-01 51° 74° 4607 3270 2080 1327 921
07-02 55° 81° 4653 3307 2107 1345 934
07-03 69° 88° 4710 3353 2143 1373 957
07-04 65° 85° 4763 3396 2176 1398 977
07-05 65° 81° 4814 3437 2207 1421 995
07-06 63° 82° 4864 3477 2237 1444 1013
07-07 60° 86° 4915 3518 2268 1466 1030
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 66° 88° 4970 3563 2304 1494 1053
07-09 71° 82° 5025 3608 2338 1520 1074
07-10 65° 73° 5072 3645 2365 1540 1089
07-11 64° 81° 5123 3686 2396 1562 1106
07-12 65° 82° 5174 3728 2428 1586 1125
07-13 64° 87° 5228 3772 2462 1612 1146
07-14 71° 86° 5285 3818 2498 1641 1170
07-15 72° 88° 5343 3866 2537 1671 1195
07-16 70° 89° 5400 3914 2574 1700 1219
07-17 69° 83° 5454 3958 2608 1726 1240
07-18 60° 73° 5499 3993 2633 1743 1252
07-19 56° 80° 5545 4029 2659 1761 1265
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 59° 82° 5593 4067 2687 1781 1280
07-21 63° 84° 5645 4108 2718 1805 1299
07-22 66° 81° 5697 4150 2750 1828 1317
07-23 64° 83° 5748 4191 2781 1852 1335
07-24 67° 78° 5798 4232 2812 1874 1353
07-25 64° 77° 5847 4270 2840 1895 1369
07-26 59° 79° 5894 4307 2867 1914 1383
07-27 57° 82° 5942 4345 2895 1933 1397
07-28 61° 89° 5994 4388 2928 1958 1417
07-29 73° 83° 6051 4434 2964 1986 1440
07-30 70° 82° 6105 4479 2999 2013 1462
07-31 68° 90° 6163 4526 3036 2042 1486
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 70° 89° 6220 4573 3074 2072 1511
08-02 72° 79° 6274 4617 3107 2097 1531
08-03 72° 88° 6332 4665 3145 2127 1556
08-04 65° 89° 6387 4710 3180 2154 1578
08-05 71° 87° 6444 4757 3217 2183 1602
08-06 62° 72° 6489 4792 3242 2200 1614
08-07 62° 77° 6536 4830 3270 2220 1629
08-08 63° 80° 6586 4869 3299 2241 1645
08-09 65° 81° 6637 4910 3330 2264 1663
08-10 56° 74° 6680 4943 3353 2280 1673
08-11 57° 75° 6724 4978 3378 2296 1685
08-12 56° 79° 6770 5013 3403 2313 1697
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 57° 81° 6817 5050 3430 2332 1711
08-14 59° 82° 6865 5088 3459 2353 1727
08-15 59° 81° 6913 5127 3487 2373 1742
08-16 67° 78° 6964 5167 3517 2396 1759
08-17 68° 79° 7015 5209 3549 2419 1778
08-18 67° 78° 7066 5249 3579 2441 1795
08-19 60° 70° 7109 5282 3602 2456 1805
08-20 56° 71° 7150 5313 3623 2470 1814
08-21 51° 74° 7190 5344 3644 2482 1821
08-22 49° 77° 7231 5374 3664 2494 1828
08-23 51° 79° 7274 5407 3688 2510 1839
08-24 57° 84° 7323 5446 3716 2530 1854
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 64° 86° 7376 5489 3749 2555 1874
08-26 68° 93° 7434 5537 3787 2585 1899
08-27 71° 95° 7495 5588 3829 2619 1928
08-28 70° 81° 7548 5632 3862 2644 1948
08-29 66° 76° 7598 5671 3891 2665 1964
08-30 64° 89° 7653 5716 3926 2692 1986
08-31 68° 84° 7707 5760 3960 2718 2007
09-01 61° 77° 7754 5797 3987 2738 2021
09-02 52° 70° 7793 5826 4006 2749 2027
09-03 48° 73° 7831 5855 4025 2759 2033
09-04 52° 78° 7874 5887 4048 2774 2043
09-05 54° 84° 7921 5925 4075 2793 2057
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 58° 70° 7963 5957 4097 2807 2066
09-07 49° 61° 7996 5979 4109 2812 2066
09-08 42° 71° 8031 6004 4124 2818 2068
09-09 55° 80° 8076 6039 4150 2836 2080
09-10 54° 78° 8120 6074 4174 2852 2091
09-11 56° 84° 8168 6112 4202 2872 2106
09-12 56° 83° 8216 6149 4229 2891 2121
09-13 61° 80° 8265 6188 4258 2912 2136
09-14 61° 80° 8313 6226 4287 2933 2152
09-15 61° 83° 8363 6266 4316 2955 2169
09-16 57° 80° 8410 6303 4343 2973 2183
09-17 56° 78° 8455 6338 4368 2991 2195
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 61° 80° 8503 6377 4397 3011 2210
09-19 60° 81° 8552 6415 4425 3032 2226
09-20 58° 84° 8600 6454 4454 3052 2241
09-21 63° 86° 8653 6496 4486 3077 2261
09-22 57° 83° 8701 6534 4515 3097 2276
09-23 61° 70° 8744 6568 4538 3112 2286
09-24 61° 71° 8788 6602 4562 3128 2297
09-25 63° 76° 8836 6640 4590 3148 2312
09-26 59° 72° 8880 6673 4613 3164 2323
09-27 61° 74° 8926 6709 4639 3181 2336
09-28 66° 68° 8971 6744 4664 3198 2348
09-29 65° 70° 9016 6780 4690 3216 2360
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 61° 73° 9061 6815 4715 3233 2372

 

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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