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Black Turfgrass Ataenius Egg Laying (GDD 50)
through Sun, Dec. 14. 2025

 
  

Port Hope, 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 18° 29° 2 0 0 0 0
02-16 17° 28° 2 0 0 0 0
02-17 4° 16° 2 0 0 0 0
02-18 1° 16° 2 0 0 0 0
02-19 9° 18° 2 0 0 0 0
02-20 13° 22° 2 0 0 0 0
02-21 18° 26° 2 0 0 0 0
02-22 19° 29° 4 0 0 0 0
02-23 23° 33° 10 0 0 0 0
02-24 28° 42° 23 3 0 0 0
02-25 30° 42° 37 7 0 0 0
02-26 26° 39° 48 8 0 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 30° 39° 60 10 0 0 0
02-28 28° 42° 73 13 0 0 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 15° 30° 73 13 0 0 0
03-02 16° 25° 73 13 0 0 0
03-03 20° 39° 81 13 0 0 0
03-04 32° 44° 97 19 0 0 0
03-05 38° 54° 121 33 4 0 0
03-06 24° 40° 131 33 4 0 0
03-07 26° 39° 141 34 4 0 0
03-08 22° 35° 148 34 4 0 0
03-09 29° 53° 167 43 4 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 31° 61° 191 57 8 0 0
03-11 29° 52° 210 66 8 0 0
03-12 29° 39° 221 67 8 0 0
03-13 26° 47° 236 72 8 0 0
03-14 33° 61° 261 87 14 0 0
03-15 51° 71° 300 116 32 11 6
03-16 29° 60° 322 128 35 11 6
03-17 27° 39° 333 129 35 11 6
03-18 36° 56° 357 143 39 11 6
03-19 43° 61° 387 163 49 13 6
03-20 30° 46° 403 169 49 13 6
03-21 27° 52° 421 177 49 13 6
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 26° 47° 436 182 49 13 6
03-23 18° 38° 442 182 49 13 6
03-24 33° 37° 455 184 49 13 6
03-25 29° 36° 465 185 49 13 6
03-26 27° 38° 476 185 49 13 6
03-27 25° 56° 494 194 49 13 6
03-28 30° 46° 510 200 49 13 6
03-29 34° 42° 526 206 49 13 6
03-30 36° 57° 551 220 53 13 6
03-31 31° 47° 568 228 53 13 6
04-01 27° 32° 575 228 53 13 6
04-02 32° 46° 592 234 53 13 6
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 39° 58° 619 251 60 13 6
04-04 31° 43° 635 257 60 13 6
04-05 36° 47° 654 266 60 13 6
04-06 31° 40° 668 270 60 13 6
04-07 28° 38° 679 271 60 13 6
04-08 24° 33° 685 271 60 13 6
04-09 22° 42° 695 271 60 13 6
04-10 32° 37° 708 273 60 13 6
04-11 29° 45° 723 278 60 13 6
04-12 27° 51° 739 285 60 13 6
04-13 36° 57° 764 300 65 13 6
04-14 44° 67° 797 323 78 18 6
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 36° 49° 818 334 79 18 6
04-16 33° 45° 835 341 79 18 6
04-17 24° 54° 852 348 79 18 6
04-18 48° 66° 887 373 94 25 8
04-19 41° 64° 918 393 105 28 8
04-20 32° 43° 933 399 105 28 8
04-21 40° 67° 965 420 116 31 8
04-22 40° 58° 992 438 124 31 8
04-23 40° 54° 1017 453 129 31 8
04-24 44° 62° 1048 474 140 34 8
04-25 43° 59° 1077 492 148 35 8
04-26 39° 48° 1098 503 149 35 8
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 35° 55° 1121 516 152 35 8
04-28 43° 68° 1155 540 166 41 9
04-29 42° 78° 1193 568 184 51 14
04-30 34° 43° 1209 575 184 51 14
05-01 37° 58° 1235 590 190 51 14
05-02 42° 58° 1263 609 198 51 14
05-03 38° 43° 1281 617 198 51 14
05-04 35° 53° 1304 629 200 51 14
05-05 46° 50° 1329 645 206 51 14
05-06 46° 60° 1361 666 217 54 14
05-07 42° 54° 1387 682 224 54 14
05-08 35° 42° 1404 689 224 54 14
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 33° 55° 1426 701 226 54 14
05-10 42° 62° 1455 721 235 56 14
05-11 39° 50° 1478 733 238 56 14
05-12 43° 66° 1510 756 250 61 14
05-13 53° 65° 1547 783 267 70 18
05-14 54° 66° 1585 810 285 79 23
05-15 52° 72° 1625 841 305 92 30
05-16 59° 78° 1672 877 332 110 43
05-17 55° 62° 1708 904 348 119 47
05-18 45° 56° 1736 922 356 119 47
05-19 38° 46° 1756 931 356 119 47
05-20 37° 48° 1777 942 357 119 47
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 45° 48° 1802 957 362 119 47
05-22 44° 47° 1825 971 365 119 47
05-23 43° 49° 1850 985 370 119 47
05-24 45° 56° 1878 1003 378 119 47
05-25 41° 57° 1905 1020 385 119 47
05-26 41° 59° 1933 1038 393 119 47
05-27 42° 64° 1964 1059 404 122 47
05-28 45° 60° 1994 1080 414 124 47
05-29 51° 64° 2030 1105 430 132 49
05-30 52° 72° 2070 1136 450 144 57
05-31 44° 55° 2098 1153 458 144 57
06-01 41° 60° 2126 1172 466 145 57
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 40° 76° 2162 1198 482 153 60
06-03 58° 82° 2210 1236 510 173 75
06-04 57° 77° 2255 1271 536 190 87
06-05 51° 62° 2290 1296 550 197 88
06-06 46° 64° 2323 1319 563 202 89
06-07 49° 63° 2357 1342 577 208 89
06-08 51° 68° 2394 1370 595 217 94
06-09 57° 70° 2436 1401 616 231 102
06-10 53° 69° 2475 1430 635 242 108
06-11 53° 83° 2521 1467 662 260 122
06-12 55° 64° 2559 1494 679 269 126
06-13 50° 61° 2592 1518 692 275 126
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 52° 60° 2626 1541 706 280 127
06-15 52° 65° 2662 1568 722 289 131
06-16 51° 74° 2703 1598 743 302 138
06-17 60° 85° 2753 1639 773 324 156
06-18 58° 67° 2794 1669 794 336 163
06-19 54° 70° 2834 1699 814 349 170
06-20 55° 70° 2875 1730 835 361 178
06-21 63° 83° 2926 1771 866 384 196
06-22 76° 91° 2987 1823 907 418 225
06-23 76° 91° 3049 1874 949 452 253
06-24 65° 78° 3098 1914 978 473 270
06-25 60° 70° 3141 1947 1001 488 280
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 59° 67° 3182 1978 1022 501 288
06-27 63° 85° 3234 2020 1054 525 307
06-28 61° 74° 3280 2055 1080 542 319
06-29 56° 80° 3326 2091 1106 561 332
06-30 68° 78° 3377 2133 1137 584 351
07-01 67° 78° 3428 2173 1168 606 368
07-02 62° 84° 3478 2214 1199 629 386
07-03 61° 73° 3523 2249 1223 646 398
07-04 55° 77° 3567 2283 1247 662 409
07-05 69° 87° 3623 2329 1283 690 432
07-06 67° 85° 3677 2373 1317 716 453
07-07 60° 65° 3718 2403 1338 729 460
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 57° 71° 3760 2436 1360 743 470
07-09 63° 77° 3808 2474 1389 763 485
07-10 64° 73° 3855 2510 1415 781 498
07-11 61° 77° 3902 2547 1442 800 512
07-12 68° 86° 3956 2592 1477 827 534
07-13 68° 79° 4008 2633 1508 851 552
07-14 61° 79° 4056 2672 1536 871 567
07-15 63° 84° 4108 2713 1568 894 586
07-16 66° 82° 4160 2755 1600 919 605
07-17 57° 73° 4203 2788 1623 933 615
07-18 51° 72° 4242 2818 1642 945 622
07-19 59° 74° 4287 2852 1667 961 633
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 62° 74° 4333 2889 1693 980 646
07-21 57° 69° 4374 2919 1714 993 654
07-22 53° 74° 4415 2951 1736 1006 663
07-23 59° 82° 4464 2990 1764 1027 679
07-24 72° 92° 4525 3040 1805 1059 706
07-25 66° 75° 4573 3079 1833 1080 721
07-26 62° 76° 4620 3115 1860 1099 735
07-27 70° 82° 4674 3159 1894 1125 756
07-28 70° 88° 4730 3206 1931 1153 780
07-29 65° 79° 4781 3246 1961 1175 797
07-30 65° 75° 4829 3284 1989 1195 812
07-31 62° 72° 4873 3319 2014 1212 824
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 59° 73° 4917 3353 2038 1228 835
08-02 53° 76° 4960 3385 2060 1242 844
08-03 57° 78° 5005 3421 2085 1260 857
08-04 58° 76° 5050 3456 2110 1277 868
08-05 62° 75° 5097 3492 2137 1295 882
08-06 64° 81° 5147 3533 2167 1318 900
08-07 65° 82° 5199 3574 2199 1342 918
08-08 67° 84° 5252 3618 2232 1367 939
08-09 72° 87° 5310 3665 2270 1396 963
08-10 72° 89° 5368 3714 2308 1427 988
08-11 71° 88° 5426 3761 2346 1456 1013
08-12 68° 83° 5479 3805 2379 1482 1034
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 67° 76° 5529 3845 2409 1504 1050
08-14 64° 77° 5578 3883 2438 1524 1066
08-15 62° 82° 5628 3923 2468 1546 1083
08-16 67° 82° 5680 3966 2500 1571 1102
08-17 61° 73° 5725 4001 2525 1588 1114
08-18 60° 71° 5769 4034 2549 1603 1125
08-19 62° 67° 5811 4067 2571 1618 1134
08-20 64° 69° 5855 4101 2596 1634 1146
08-21 62° 71° 5900 4135 2620 1651 1157
08-22 57° 77° 5945 4171 2645 1668 1169
08-23 65° 78° 5994 4210 2675 1689 1186
08-24 57° 72° 6037 4242 2697 1704 1195
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 56° 67° 6076 4272 2717 1715 1202
08-26 50° 66° 6112 4298 2732 1723 1205
08-27 47° 73° 6150 4326 2750 1733 1210
08-28 56° 67° 6190 4355 2770 1745 1216
08-29 50° 63° 6224 4380 2784 1751 1218
08-30 47° 66° 6259 4405 2799 1758 1220
08-31 49° 69° 6296 4432 2817 1767 1224
09-01 53° 71° 6336 4462 2837 1779 1231
09-02 53° 73° 6378 4493 2858 1793 1239
09-03 56° 76° 6422 4528 2882 1809 1250
09-04 49° 62° 6456 4551 2896 1815 1251
09-05 49° 66° 6492 4577 2912 1822 1254
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 48° 61° 6524 4600 2924 1827 1254
09-07 46° 62° 6556 4622 2937 1831 1254
09-08 44° 62° 6587 4643 2948 1834 1254
09-09 48° 70° 6625 4670 2965 1843 1259
09-10 51° 72° 6664 4700 2984 1855 1265
09-11 51° 69° 6702 4728 3003 1865 1270
09-12 56° 71° 6744 4759 3024 1879 1279
09-13 59° 73° 6788 4793 3048 1895 1290
09-14 54° 73° 6829 4825 3069 1908 1298
09-15 57° 71° 6871 4857 3091 1922 1307
09-16 54° 72° 6912 4888 3112 1935 1315
09-17 52° 74° 6953 4919 3133 1948 1323
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 56° 73° 6996 4951 3156 1962 1332
09-19 58° 67° 7036 4981 3176 1975 1340
09-20 58° 69° 7077 5013 3198 1988 1348
09-21 56° 69° 7118 5044 3218 2001 1356
09-22 62° 73° 7164 5079 3244 2018 1369
09-23 60° 69° 7207 5112 3267 2033 1378
09-24 63° 66° 7250 5145 3290 2048 1388
09-25 59° 68° 7291 5177 3311 2062 1397
09-26 56° 72° 7333 5209 3334 2076 1406
09-27 59° 75° 7378 5244 3358 2093 1418
09-28 54° 69° 7418 5273 3378 2104 1424
09-29 49° 72° 7456 5302 3396 2115 1430
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 52° 68° 7494 5329 3414 2125 1435
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 28° 34° 9 0 0 0 0
02-16 24° 29° 13 0 0 0 0
02-17 17° 23° 13 0 0 0 0
02-18 20° 31° 17 0 0 0 0
02-19 14° 35° 19 0 0 0 0
02-20 23° 44° 31 2 0 0 0
02-21 33° 56° 53 14 3 0 0
02-22 29° 47° 70 21 3 0 0
02-23 23° 37° 78 21 3 0 0
02-24 19° 26° 79 21 3 0 0
02-25 25° 47° 93 25 3 0 0
02-26 28° 44° 107 28 3 0 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 45° 69° 141 53 17 7 2
02-28 22° 57° 158 60 17 7 2
02-29 16° 30° 160 60 17 7 2
03-01 27° 49° 176 66 17 7 2
03-02 35° 48° 195 76 17 7 2
03-03 31° 49° 213 84 17 7 2
03-04 41° 67° 245 106 29 11 2
03-05 38° 58° 271 121 35 11 2
03-06 35° 39° 286 126 35 11 2
03-07 32° 43° 301 132 35 11 2
03-08 36° 43° 319 140 35 11 2
03-09 33° 48° 338 148 35 11 2
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 28° 35° 347 148 35 11 2
03-11 27° 50° 364 155 35 11 2
03-12 32° 62° 389 170 41 11 2
03-13 39° 53° 413 184 44 11 2
03-14 38° 42° 431 192 44 11 2
03-15 31° 40° 445 196 44 11 2
03-16 31° 50° 463 204 44 11 2
03-17 28° 38° 475 206 44 11 2
03-18 26° 32° 482 206 44 11 2
03-19 29° 39° 493 207 44 11 2
03-20 24° 34° 500 207 44 11 2
03-21 20° 30° 503 207 44 11 2
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 24° 28° 508 207 44 11 2
03-23 25° 32° 514 207 44 11 2
03-24 21° 35° 520 207 44 11 2
03-25 32° 54° 542 218 46 11 2
03-26 43° 51° 566 233 50 11 2
03-27 33° 43° 583 239 50 11 2
03-28 27° 44° 596 243 50 11 2
03-29 26° 42° 608 245 50 11 2
03-30 29° 38° 619 246 50 11 2
03-31 33° 38° 633 249 50 11 2
04-01 32° 41° 647 254 50 11 2
04-02 37° 42° 664 261 50 11 2
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 36° 43° 682 268 50 11 2
04-04 34° 38° 696 272 50 11 2
04-05 33° 42° 711 278 50 11 2
04-06 35° 47° 730 287 50 11 2
04-07 29° 47° 746 293 50 11 2
04-08 42° 61° 776 313 60 12 2
04-09 43° 70° 810 337 75 19 3
04-10 38° 57° 836 353 80 19 3
04-11 40° 47° 858 364 82 19 3
04-12 40° 45° 878 375 82 19 3
04-13 38° 58° 904 391 88 19 3
04-14 42° 60° 933 410 97 20 3
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 37° 55° 957 424 101 20 3
04-16 37° 49° 978 435 102 20 3
04-17 44° 51° 1004 451 108 20 3
04-18 47° 53° 1032 469 116 20 3
04-19 41° 52° 1056 483 120 20 3
04-20 36° 44° 1074 491 120 20 3
04-21 34° 45° 1092 499 120 20 3
04-22 30° 61° 1116 513 124 20 3
04-23 45° 64° 1148 535 137 25 3
04-24 31° 46° 1165 542 137 25 3
04-25 29° 42° 1179 545 137 25 3
04-26 32° 54° 1200 556 138 25 3
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 48° 77° 1240 587 158 37 11
04-28 42° 69° 1274 610 171 43 11
04-29 44° 66° 1307 633 185 48 11
04-30 49° 60° 1339 656 197 52 11
05-01 43° 75° 1376 683 214 61 15
05-02 42° 56° 1403 700 221 61 15
05-03 47° 60° 1435 721 233 65 15
05-04 45° 64° 1467 744 245 69 15
05-05 47° 61° 1499 766 257 73 15
05-06 41° 56° 1525 782 263 73 15
05-07 37° 62° 1553 800 271 73 15
05-08 46° 60° 1584 821 282 76 15
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 42° 51° 1609 836 287 76 15
05-10 41° 58° 1636 853 294 76 15
05-11 45° 51° 1662 869 300 76 15
05-12 40° 61° 1690 887 308 77 15
05-13 52° 76° 1733 919 330 91 24
05-14 45° 51° 1759 935 336 91 24
05-15 45° 54° 1786 953 344 91 24
05-16 41° 61° 1815 972 353 92 24
05-17 54° 68° 1854 1001 372 103 30
05-18 56° 68° 1894 1031 392 115 37
05-19 55° 75° 1937 1064 415 130 47
05-20 51° 74° 1978 1094 435 142 55
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 55° 64° 2015 1122 453 152 59
05-22 60° 82° 2064 1161 482 173 75
05-23 55° 74° 2106 1193 504 187 85
05-24 49° 60° 2139 1216 517 191 85
05-25 55° 74° 2181 1248 539 206 94
05-26 49° 64° 2216 1272 553 212 95
05-27 55° 63° 2253 1299 571 221 99
05-28 55° 66° 2291 1328 589 232 105
05-29 47° 57° 2321 1348 599 234 105
05-30 42° 61° 2350 1367 608 235 105
05-31 42° 69° 2384 1391 622 241 106
06-01 51° 72° 2423 1420 641 252 112
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 55° 62° 2460 1447 658 261 115
06-03 55° 67° 2499 1476 677 271 121
06-04 58° 79° 2546 1512 704 290 135
06-05 66° 78° 2596 1552 733 312 152
06-06 60° 72° 2639 1586 757 328 163
06-07 57° 66° 2679 1616 777 339 169
06-08 53° 67° 2717 1644 795 349 174
06-09 52° 65° 2753 1670 811 358 178
06-10 50° 59° 2786 1692 824 362 178
06-11 42° 64° 2817 1714 835 365 178
06-12 56° 79° 2863 1750 861 383 191
06-13 66° 85° 2916 1793 894 409 211
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 57° 67° 2956 1823 914 421 218
06-15 52° 64° 2992 1849 930 429 221
06-16 52° 77° 3035 1881 953 443 230
06-17 70° 89° 3092 1929 990 473 255
06-18 71° 89° 3151 1977 1028 503 280
06-19 68° 89° 3207 2024 1065 532 304
06-20 62° 69° 3251 2058 1089 548 315
06-21 61° 73° 3296 2093 1114 564 327
06-22 63° 73° 3342 2128 1140 582 339
06-23 63° 72° 3387 2164 1165 599 352
06-24 58° 78° 3433 2200 1191 617 365
06-25 65° 81° 3484 2240 1221 640 382
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 59° 74° 3528 2275 1246 656 394
06-27 54° 67° 3566 2303 1264 667 399
06-28 51° 70° 3605 2331 1282 677 404
06-29 63° 81° 3655 2372 1313 700 422
06-30 54° 71° 3694 2401 1332 711 428
07-01 50° 72° 3733 2430 1351 722 434
07-02 53° 72° 3774 2461 1372 735 442
07-03 66° 82° 3826 2503 1404 759 461
07-04 63° 79° 3875 2542 1433 780 477
07-05 61° 75° 3921 2578 1459 798 490
07-06 63° 73° 3967 2614 1485 816 503
07-07 60° 74° 4012 2649 1510 833 515
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 64° 79° 4062 2689 1540 855 532
07-09 69° 78° 4113 2730 1571 878 550
07-10 64° 70° 4159 2765 1596 895 562
07-11 64° 74° 4205 2802 1623 914 576
07-12 59° 76° 4251 2838 1649 932 589
07-13 62° 79° 4300 2877 1678 952 605
07-14 69° 82° 4353 2920 1711 978 625
07-15 69° 83° 4407 2964 1745 1004 646
07-16 68° 80° 4460 3006 1777 1028 665
07-17 64° 74° 4506 3043 1804 1047 679
07-18 59° 69° 4549 3076 1827 1061 689
07-19 54° 75° 4591 3108 1849 1076 698
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 58° 80° 4638 3145 1876 1095 712
07-21 63° 74° 4684 3181 1902 1113 725
07-22 60° 74° 4729 3216 1927 1130 737
07-23 63° 76° 4777 3253 1955 1149 751
07-24 64° 72° 4822 3289 1980 1167 764
07-25 59° 73° 4867 3323 2005 1183 775
07-26 55° 75° 4909 3356 2027 1198 785
07-27 56° 77° 4954 3391 2052 1215 797
07-28 59° 81° 5002 3429 2080 1235 812
07-29 69° 80° 5054 3471 2112 1259 831
07-30 69° 78° 5106 3512 2143 1282 849
07-31 66° 82° 5158 3555 2176 1306 869
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 68° 80° 5210 3597 2208 1331 888
08-02 70° 80° 5263 3640 2241 1356 908
08-03 66° 81° 5315 3681 2273 1379 926
08-04 63° 81° 5365 3721 2302 1401 943
08-05 68° 75° 5414 3761 2332 1422 960
08-06 64° 72° 5460 3797 2358 1441 973
08-07 61° 74° 5506 3832 2384 1458 985
08-08 60° 76° 5552 3868 2410 1476 998
08-09 64° 76° 5599 3906 2437 1496 1013
08-10 57° 70° 5641 3937 2458 1509 1021
08-11 59° 72° 5684 3971 2482 1524 1032
08-12 55° 76° 5727 4004 2505 1540 1042
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 57° 76° 5772 4038 2529 1556 1053
08-14 56° 77° 5816 4073 2554 1573 1065
08-15 57° 78° 5861 4108 2579 1590 1077
08-16 66° 72° 5908 4145 2606 1609 1091
08-17 67° 75° 5957 4184 2635 1630 1107
08-18 66° 71° 6004 4221 2662 1649 1121
08-19 59° 66° 6045 4251 2682 1661 1128
08-20 56° 66° 6084 4280 2701 1672 1134
08-21 55° 69° 6124 4310 2721 1684 1141
08-22 51° 74° 6164 4341 2742 1696 1149
08-23 55° 75° 6207 4374 2765 1712 1159
08-24 60° 78° 6254 4411 2792 1730 1173
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 60° 79° 6301 4448 2819 1750 1187
08-26 66° 85° 6355 4491 2852 1775 1207
08-27 71° 90° 6413 4540 2891 1805 1233
08-28 63° 71° 6457 4574 2915 1822 1244
08-29 62° 72° 6502 4609 2940 1839 1256
08-30 65° 81° 6553 4650 2971 1862 1274
08-31 64° 80° 6603 4690 3001 1884 1291
09-01 60° 71° 6647 4724 3025 1900 1302
09-02 53° 66° 6685 4751 3042 1909 1306
09-03 47° 72° 6722 4779 3060 1919 1311
09-04 52° 75° 6764 4811 3082 1932 1320
09-05 57° 81° 6811 4848 3109 1952 1334
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 54° 69° 6850 4877 3128 1963 1340
09-07 50° 56° 6882 4899 3140 1966 1340
09-08 47° 68° 6917 4924 3155 1974 1343
09-09 55° 72° 6959 4956 3177 1987 1351
09-10 50° 71° 6997 4984 3195 1998 1357
09-11 55° 77° 7041 5018 3219 2014 1368
09-12 58° 78° 7087 5054 3245 2032 1381
09-13 57° 73° 7130 5087 3268 2047 1391
09-14 58° 75° 7175 5122 3293 2063 1402
09-15 59° 79° 7222 5159 3320 2083 1416
09-16 57° 78° 7267 5194 3345 2100 1429
09-17 56° 76° 7312 5228 3369 2116 1440
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 59° 75° 7356 5263 3394 2133 1452
09-19 56° 75° 7400 5296 3418 2148 1462
09-20 59° 77° 7446 5332 3443 2166 1475
09-21 60° 77° 7492 5369 3470 2185 1489
09-22 59° 75° 7537 5404 3495 2202 1501
09-23 60° 65° 7578 5435 3516 2215 1508
09-24 61° 69° 7621 5468 3539 2230 1518
09-25 61° 70° 7665 5501 3563 2245 1529
09-26 55° 71° 7705 5532 3583 2258 1537
09-27 54° 72° 7746 5563 3604 2271 1545
09-28 64° 71° 7792 5599 3630 2288 1557
09-29 63° 72° 7837 5634 3655 2305 1569
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 60° 72° 7881 5667 3679 2321 1580

 

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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