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Black Turfgrass Ataenius Egg Laying (GDD 50)
through Wed, Dec. 10. 2025

 
  

Southport, IN

        

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 33° 40° 15 5 0 0 0
02-16 21° 36° 21 5 0 0 0
02-17 8° 18° 21 5 0 0 0
02-18 8° 17° 21 5 0 0 0
02-19 13° 19° 21 5 0 0 0
02-20 2° 20° 21 5 0 0 0
02-21 14° 29° 21 5 0 0 0
02-22 14° 35° 23 5 0 0 0
02-23 21° 46° 35 6 0 0 0
02-24 33° 55° 57 18 2 0 0
02-25 38° 60° 83 34 8 0 0
02-26 32° 62° 108 49 13 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 41° 55° 134 65 19 0 0
02-28 30° 63° 158 79 23 0 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 21° 47° 170 81 23 0 0
03-02 15° 36° 174 81 23 0 0
03-03 25° 46° 187 85 23 0 0
03-04 43° 65° 219 107 35 4 0
03-05 33° 55° 242 119 38 4 0
03-06 31° 41° 256 123 38 4 0
03-07 32° 43° 271 128 38 4 0
03-08 31° 49° 289 137 38 4 0
03-09 33° 58° 312 150 41 4 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 35° 67° 341 169 49 5 0
03-11 46° 72° 378 195 66 14 4
03-12 38° 74° 412 219 80 19 5
03-13 40° 75° 447 245 96 27 7
03-14 52° 77° 490 278 118 42 17
03-15 56° 69° 531 308 139 54 25
03-16 33° 57° 554 321 142 54 25
03-17 28° 50° 571 329 142 54 25
03-18 41° 74° 607 354 158 62 27
03-19 55° 65° 645 383 176 72 33
03-20 35° 51° 666 394 177 72 33
03-21 29° 56° 687 404 178 72 33
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 39° 52° 710 418 181 72 33
03-23 34° 46° 728 426 181 72 33
03-24 36° 53° 750 438 184 72 33
03-25 37° 50° 772 449 185 72 33
03-26 30° 54° 792 459 185 72 33
03-27 37° 58° 818 475 191 72 33
03-28 49° 80° 860 508 214 87 42
03-29 64° 72° 906 544 240 105 55
03-30 56° 72° 948 576 262 119 64
03-31 36° 57° 973 591 266 119 64
04-01 29° 53° 992 600 266 119 64
04-02 47° 81° 1034 632 288 133 73
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 51° 65° 1070 658 304 141 77
04-04 46° 55° 1099 677 313 142 77
04-05 45° 60° 1130 697 324 145 77
04-06 36° 45° 1148 706 324 145 77
04-07 32° 55° 1170 717 325 145 77
04-08 26° 42° 1182 719 325 145 77
04-09 31° 45° 1197 725 325 145 77
04-10 38° 62° 1225 743 333 145 77
04-11 38° 51° 1248 755 336 145 77
04-12 31° 58° 1270 768 338 145 77
04-13 44° 63° 1302 790 350 148 77
04-14 56° 73° 1344 822 372 163 86
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 46° 54° 1372 840 380 163 86
04-16 36° 59° 1398 855 386 163 86
04-17 40° 66° 1429 876 396 165 86
04-18 58° 80° 1475 913 423 184 100
04-19 55° 72° 1517 945 445 198 108
04-20 50° 76° 1558 975 466 211 116
04-21 53° 70° 1597 1005 485 222 122
04-22 45° 72° 1634 1031 501 230 126
04-23 50° 78° 1676 1063 524 245 135
04-24 53° 82° 1721 1099 549 262 147
04-25 60° 69° 1764 1131 571 276 157
04-26 45° 61° 1794 1152 582 279 157
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 43° 66° 1827 1175 595 284 157
04-28 53° 82° 1873 1210 620 301 169
04-29 63° 79° 1921 1249 649 322 185
04-30 50° 72° 1960 1278 668 333 191
05-01 65° 75° 2008 1316 696 353 206
05-02 59° 73° 2052 1350 720 369 217
05-03 52° 61° 2087 1374 734 375 218
05-04 47° 51° 2113 1391 741 375 218
05-05 50° 61° 2147 1414 755 381 218
05-06 49° 72° 2185 1443 773 391 224
05-07 52° 77° 2228 1475 796 406 233
05-08 54° 71° 2268 1506 816 418 241
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 42° 67° 2301 1529 829 423 241
05-10 43° 77° 2339 1557 847 433 246
05-11 50° 80° 2382 1590 870 448 256
05-12 59° 76° 2428 1625 896 466 269
05-13 63° 75° 2475 1662 923 485 283
05-14 62° 77° 2522 1700 950 504 297
05-15 65° 86° 2576 1744 984 530 318
05-16 63° 84° 2628 1786 1016 554 337
05-17 61° 69° 2671 1819 1039 569 347
05-18 54° 75° 2713 1851 1061 583 356
05-19 52° 76° 2756 1883 1083 598 365
05-20 54° 68° 2794 1912 1102 608 371
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 54° 62° 2830 1938 1118 616 374
05-22 50° 57° 2862 1959 1130 620 374
05-23 42° 66° 2894 1981 1141 623 374
05-24 48° 70° 2930 2008 1158 632 378
05-25 51° 64° 2966 2033 1173 640 380
05-26 48° 71° 3003 2061 1191 649 385
05-27 59° 68° 3045 2092 1212 663 393
05-28 58° 67° 3085 2123 1233 675 401
05-29 54° 69° 3125 2153 1253 687 408
05-30 59° 74° 3170 2187 1277 704 419
05-31 58° 74° 3214 2221 1302 720 430
06-01 42° 75° 3250 2248 1318 728 434
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 48° 80° 3292 2280 1340 742 443
06-03 60° 86° 3343 2321 1371 765 461
06-04 69° 84° 3398 2366 1406 792 483
06-05 68° 75° 3448 2405 1435 814 499
06-06 67° 79° 3499 2446 1467 837 517
06-07 64° 76° 3547 2484 1494 856 532
06-08 65° 77° 3596 2523 1523 877 548
06-09 61° 76° 3642 2560 1550 896 561
06-10 57° 75° 3686 2593 1573 912 572
06-11 57° 83° 3734 2632 1602 932 587
06-12 62° 83° 3785 2672 1633 955 605
06-13 70° 79° 3837 2715 1665 979 625
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 69° 76° 3888 2755 1696 1002 642
06-15 66° 79° 3939 2796 1727 1025 660
06-16 66° 81° 3991 2838 1758 1048 679
06-17 70° 83° 4045 2882 1793 1075 700
06-18 68° 86° 4100 2928 1828 1102 723
06-19 69° 81° 4153 2970 1861 1127 742
06-20 65° 83° 4205 3013 1893 1151 761
06-21 70° 91° 4263 3061 1931 1181 787
06-22 75° 92° 4325 3112 1973 1215 815
06-23 74° 93° 4386 3164 2014 1248 844
06-24 76° 93° 4449 3216 2057 1283 873
06-25 76° 90° 4510 3267 2098 1316 901
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 73° 90° 4570 3317 2137 1347 928
06-27 76° 89° 4630 3367 2178 1380 955
06-28 74° 87° 4689 3416 2216 1411 981
06-29 73° 83° 4744 3462 2252 1438 1004
06-30 73° 85° 4801 3509 2289 1467 1028
07-01 72° 85° 4857 3555 2325 1495 1051
07-02 63° 84° 4909 3596 2357 1519 1069
07-03 69° 88° 4965 3643 2393 1547 1093
07-04 67° 89° 5021 3689 2429 1575 1116
07-05 70° 91° 5080 3737 2468 1606 1141
07-06 72° 88° 5138 3786 2506 1636 1167
07-07 71° 79° 5191 3829 2539 1661 1187
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 64° 86° 5244 3872 2572 1686 1207
07-09 70° 83° 5299 3916 2607 1713 1228
07-10 68° 89° 5355 3963 2643 1741 1252
07-11 71° 90° 5414 4011 2681 1771 1277
07-12 73° 86° 5471 4059 2719 1801 1302
07-13 70° 86° 5527 4105 2755 1829 1325
07-14 70° 85° 5583 4150 2791 1857 1347
07-15 71° 84° 5638 4196 2826 1884 1370
07-16 72° 85° 5694 4242 2862 1912 1393
07-17 69° 85° 5750 4287 2897 1939 1415
07-18 69° 82° 5803 4331 2931 1965 1436
07-19 68° 82° 5857 4374 2964 1990 1456
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 73° 83° 5913 4420 3001 2019 1479
07-21 72° 83° 5968 4466 3036 2046 1502
07-22 66° 85° 6021 4509 3069 2071 1522
07-23 65° 89° 6076 4554 3104 2098 1543
07-24 73° 92° 6136 4604 3144 2130 1571
07-25 76° 87° 6196 4653 3184 2162 1597
07-26 74° 89° 6255 4703 3223 2193 1624
07-27 76° 89° 6315 4753 3263 2225 1651
07-28 73° 86° 6373 4801 3301 2255 1676
07-29 73° 92° 6434 4851 3342 2288 1703
07-30 71° 90° 6492 4900 3380 2318 1729
07-31 67° 76° 6542 4939 3410 2340 1745
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 59° 75° 6587 4975 3435 2357 1758
08-02 58° 75° 6632 5009 3459 2374 1769
08-03 56° 80° 6678 5046 3486 2392 1782
08-04 63° 81° 6728 5086 3516 2414 1799
08-05 66° 80° 6779 5127 3547 2437 1818
08-06 64° 85° 6832 5169 3579 2462 1837
08-07 67° 87° 6887 5214 3614 2488 1859
08-08 67° 88° 6942 5259 3649 2516 1881
08-09 69° 89° 6999 5306 3687 2545 1905
08-10 69° 89° 7056 5353 3724 2574 1929
08-11 70° 90° 7114 5401 3761 2603 1954
08-12 70° 85° 7169 5447 3797 2631 1977
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 69° 85° 7224 5492 3832 2658 1999
08-14 66° 86° 7278 5536 3866 2684 2020
08-15 66° 89° 7334 5582 3902 2712 2043
08-16 70° 89° 7392 5629 3939 2742 2067
08-17 69° 87° 7448 5675 3975 2769 2090
08-18 70° 85° 7503 5721 4011 2797 2113
08-19 71° 85° 7559 5767 4047 2825 2136
08-20 69° 75° 7610 5807 4077 2847 2153
08-21 66° 76° 7659 5846 4106 2868 2169
08-22 62° 77° 7706 5884 4134 2888 2184
08-23 64° 79° 7756 5923 4163 2910 2200
08-24 59° 75° 7801 5958 4188 2927 2212
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 53° 71° 7841 5988 4208 2938 2219
08-26 50° 72° 7880 6017 4228 2950 2225
08-27 48° 75° 7920 6047 4248 2962 2232
08-28 54° 75° 7962 6080 4270 2976 2242
08-29 53° 75° 8004 6112 4292 2990 2251
08-30 49° 76° 8045 6143 4313 3003 2259
08-31 49° 77° 8086 6174 4334 3016 2267
09-01 51° 81° 8130 6208 4358 3032 2277
09-02 54° 82° 8176 6244 4384 3050 2291
09-03 54° 81° 8222 6279 4409 3068 2303
09-04 55° 70° 8262 6310 4430 3080 2311
09-05 53° 74° 8303 6341 4451 3093 2319
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 53° 69° 8343 6370 4470 3104 2325
09-07 50° 70° 8381 6398 4489 3115 2330
09-08 43° 73° 8417 6424 4504 3123 2333
09-09 46° 76° 8456 6453 4524 3134 2339
09-10 53° 82° 8502 6489 4549 3151 2352
09-11 56° 84° 8549 6527 4577 3171 2367
09-12 55° 85° 8598 6565 4605 3191 2382
09-13 56° 80° 8644 6601 4631 3209 2395
09-14 63° 86° 8696 6644 4664 3234 2415
09-15 59° 87° 8748 6685 4695 3258 2433
09-16 60° 86° 8798 6726 4726 3280 2451
09-17 57° 86° 8848 6765 4755 3302 2467
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 58° 88° 8899 6806 4787 3325 2485
09-19 59° 88° 8950 6847 4818 3348 2503
09-20 61° 88° 9002 6890 4850 3372 2523
09-21 65° 83° 9054 6932 4882 3396 2542
09-22 64° 72° 9100 6968 4908 3414 2555
09-23 63° 78° 9148 7006 4936 3434 2570
09-24 64° 79° 9198 7045 4966 3456 2586
09-25 63° 75° 9245 7082 4992 3475 2600
09-26 54° 79° 9289 7117 5017 3491 2612
09-27 54° 84° 9336 7154 5044 3510 2626
09-28 57° 88° 9387 7194 5074 3533 2643
09-29 58° 88° 9437 7235 5105 3555 2661
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 59° 84° 9487 7274 5134 3577 2677
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 33° 49° 19 9 0 0 0
02-16 23° 34° 26 9 0 0 0
02-17 14° 22° 26 9 0 0 0
02-18 14° 36° 28 9 0 0 0
02-19 19° 46° 39 10 0 0 0
02-20 30° 56° 60 21 1 0 0
02-21 35° 65° 88 39 9 0 0
02-22 42° 55° 114 55 16 0 0
02-23 35° 52° 135 66 17 0 0
02-24 26° 42° 148 68 17 0 0
02-25 26° 59° 168 79 17 0 0
02-26 35° 72° 199 100 28 3 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 59° 67° 240 131 49 16 8
02-28 28° 69° 267 147 56 16 8
02-29 22° 43° 277 148 56 16 8
03-01 30° 43° 291 152 56 16 8
03-02 40° 51° 315 166 60 16 8
03-03 39° 67° 346 187 71 19 8
03-04 54° 76° 389 220 94 34 18
03-05 54° 63° 426 247 110 43 22
03-06 45° 53° 453 264 117 43 22
03-07 43° 48° 477 278 121 43 22
03-08 46° 56° 506 297 130 44 22
03-09 39° 55° 531 312 136 44 22
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 31° 46° 547 318 136 44 22
03-11 27° 59° 568 329 137 44 22
03-12 41° 68° 601 352 149 49 22
03-13 45° 74° 639 380 167 58 26
03-14 56° 72° 680 411 189 72 35
03-15 44° 60° 710 431 198 74 35
03-16 36° 61° 737 448 205 74 35
03-17 36° 47° 757 458 205 74 35
03-18 30° 34° 767 458 205 74 35
03-19 26° 54° 785 466 205 74 35
03-20 33° 50° 805 476 205 74 35
03-21 24° 42° 816 477 205 74 35
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 32° 44° 832 483 205 74 35
03-23 31° 44° 847 488 205 74 35
03-24 30° 52° 867 497 205 74 35
03-25 44° 68° 900 521 219 80 36
03-26 42° 62° 931 542 229 82 36
03-27 35° 45° 949 550 229 82 36
03-28 28° 57° 970 560 230 82 36
03-29 40° 68° 1002 583 242 87 36
03-30 52° 75° 1044 615 264 100 45
03-31 43° 65° 1076 637 277 105 45
04-01 47° 65° 1110 661 291 111 46
04-02 44° 68° 1144 685 305 117 47
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 36° 42° 1161 692 305 117 47
04-04 35° 40° 1177 698 305 117 47
04-05 37° 45° 1196 707 305 117 47
04-06 30° 57° 1217 718 306 117 47
04-07 38° 63° 1246 737 315 118 47
04-08 46° 75° 1285 766 334 128 52
04-09 56° 71° 1326 797 355 142 61
04-10 53° 61° 1361 822 370 149 63
04-11 50° 61° 1394 845 383 154 63
04-12 47° 58° 1425 866 394 156 63
04-13 43° 66° 1458 889 407 161 63
04-14 56° 80° 1504 925 433 179 76
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 61° 75° 1550 961 459 197 89
04-16 59° 79° 1597 998 486 217 103
04-17 64° 73° 1644 1035 512 235 117
04-18 50° 76° 1684 1065 533 248 125
04-19 48° 67° 1720 1091 549 255 127
04-20 42° 51° 1744 1105 553 255 127
04-21 36° 44° 1763 1114 553 255 127
04-22 35° 63° 1789 1130 560 255 127
04-23 48° 64° 1823 1154 574 261 128
04-24 43° 52° 1849 1169 579 261 128
04-25 40° 60° 1877 1188 587 261 128
04-26 43° 69° 1911 1212 602 268 129
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 63° 79° 1960 1250 630 288 145
04-28 66° 80° 2011 1292 661 312 163
04-29 62° 73° 2056 1327 687 329 176
04-30 58° 74° 2100 1361 711 345 187
05-01 56° 81° 2147 1397 737 363 200
05-02 59° 85° 2197 1438 768 386 217
05-03 65° 75° 2245 1476 795 405 232
05-04 61° 79° 2293 1514 823 426 247
05-05 62° 75° 2339 1550 850 444 261
05-06 59° 75° 2385 1586 875 461 273
05-07 62° 78° 2433 1624 903 482 288
05-08 59° 81° 2481 1662 931 502 303
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 53° 68° 2519 1690 950 512 309
05-10 51° 66° 2556 1716 966 520 312
05-11 56° 71° 2597 1748 987 533 320
05-12 47° 79° 2638 1779 1008 546 328
05-13 56° 79° 2683 1814 1034 564 341
05-14 61° 68° 2726 1847 1056 578 350
05-15 62° 71° 2770 1881 1081 595 362
05-16 56° 75° 2814 1915 1104 610 372
05-17 63° 73° 2860 1951 1131 629 385
05-18 60° 80° 2908 1989 1159 649 400
05-19 61° 86° 2959 2030 1190 672 419
05-20 64° 86° 3012 2073 1223 697 439
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 66° 86° 3067 2117 1257 723 460
05-22 70° 83° 3121 2162 1291 749 481
05-23 59° 78° 3167 2198 1318 768 495
05-24 64° 82° 3218 2239 1349 791 512
05-25 62° 80° 3267 2278 1377 811 528
05-26 62° 75° 3313 2314 1404 830 541
05-27 63° 73° 3359 2350 1429 848 554
05-28 58° 74° 3403 2384 1454 864 566
05-29 54° 71° 3444 2415 1474 877 573
05-30 51° 75° 3485 2446 1496 890 581
05-31 55° 77° 3529 2480 1519 906 592
06-01 61° 74° 3575 2516 1545 923 605
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 63° 75° 3622 2553 1573 943 619
06-03 62° 83° 3672 2593 1603 965 637
06-04 66° 84° 3725 2636 1636 990 657
06-05 70° 81° 3779 2680 1669 1015 677
06-06 64° 81° 3829 2720 1700 1038 694
06-07 59° 81° 3877 2758 1728 1058 709
06-08 56° 80° 3923 2794 1753 1076 722
06-09 58° 79° 3969 2830 1780 1094 736
06-10 57° 68° 4010 2861 1801 1107 744
06-11 45° 76° 4049 2890 1819 1117 749
06-12 55° 85° 4097 2927 1847 1137 764
06-13 65° 88° 4151 2972 1882 1164 785
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 67° 87° 4206 3017 1917 1191 808
06-15 63° 85° 4258 3059 1949 1215 827
06-16 62° 91° 4313 3104 1983 1241 848
06-17 76° 92° 4375 3156 2026 1276 877
06-18 75° 85° 4433 3204 2063 1306 902
06-19 75° 91° 4494 3255 2104 1338 930
06-20 71° 91° 4553 3304 2143 1369 956
06-21 70° 92° 4612 3353 2183 1401 982
06-22 72° 91° 4672 3403 2222 1433 1009
06-23 72° 85° 4729 3450 2259 1461 1033
06-24 63° 87° 4782 3493 2292 1486 1053
06-25 70° 86° 4838 3539 2328 1514 1076
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 66° 77° 4887 3578 2358 1536 1093
06-27 61° 82° 4937 3618 2388 1558 1110
06-28 65° 86° 4991 3662 2421 1583 1130
06-29 74° 81° 5046 3707 2457 1611 1153
06-30 61° 76° 5093 3744 2483 1629 1166
07-01 53° 76° 5135 3776 2506 1644 1176
07-02 56° 84° 5183 3814 2534 1664 1191
07-03 70° 86° 5240 3860 2570 1692 1214
07-04 70° 81° 5293 3904 2604 1718 1235
07-05 65° 82° 5345 3946 2635 1742 1253
07-06 63° 82° 5396 3987 2666 1764 1271
07-07 63° 86° 5448 4029 2699 1789 1291
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 66° 88° 5503 4074 2734 1816 1313
07-09 72° 78° 5556 4117 2767 1841 1333
07-10 66° 80° 5607 4158 2798 1864 1351
07-11 65° 81° 5659 4200 2829 1887 1369
07-12 65° 85° 5712 4243 2862 1913 1389
07-13 68° 89° 5769 4289 2899 1941 1413
07-14 72° 87° 5826 4337 2936 1970 1437
07-15 70° 89° 5883 4384 2974 2000 1462
07-16 69° 86° 5938 4429 3009 2027 1484
07-17 71° 82° 5993 4474 3044 2054 1505
07-18 58° 74° 6037 4508 3068 2070 1517
07-19 58° 78° 6083 4544 3094 2088 1530
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 58° 81° 6131 4582 3122 2108 1545
07-21 63° 81° 6181 4622 3152 2130 1561
07-22 67° 81° 6233 4664 3183 2153 1580
07-23 62° 84° 6284 4705 3214 2176 1598
07-24 67° 82° 6336 4747 3247 2201 1618
07-25 64° 82° 6388 4788 3278 2224 1636
07-26 58° 82° 6436 4827 3306 2244 1651
07-27 58° 84° 6485 4866 3335 2265 1667
07-28 67° 79° 6536 4907 3366 2288 1685
07-29 69° 83° 6590 4951 3401 2315 1706
07-30 71° 88° 6648 4998 3438 2344 1731
07-31 70° 84° 6702 5043 3473 2371 1753
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 70° 88° 6759 5090 3510 2400 1776
08-02 71° 84° 6815 5135 3545 2427 1799
08-03 68° 87° 6870 5181 3581 2455 1822
08-04 67° 89° 6926 5227 3617 2483 1845
08-05 71° 91° 6985 5276 3656 2514 1871
08-06 73° 92° 7046 5326 3696 2546 1898
08-07 67° 79° 7096 5367 3727 2569 1916
08-08 63° 83° 7147 5408 3758 2592 1934
08-09 65° 80° 7197 5448 3788 2614 1951
08-10 54° 76° 7241 5482 3811 2629 1961
08-11 55° 77° 7285 5515 3835 2645 1972
08-12 54° 79° 7329 5550 3860 2662 1984
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 59° 83° 7379 5590 3889 2683 2000
08-14 59° 85° 7429 5630 3919 2706 2017
08-15 65° 82° 7480 5671 3951 2729 2036
08-16 69° 85° 7535 5716 3986 2756 2058
08-17 69° 83° 7589 5760 4020 2782 2079
08-18 67° 78° 7640 5801 4050 2805 2096
08-19 62° 76° 7687 5838 4078 2824 2111
08-20 56° 71° 7729 5870 4100 2838 2119
08-21 51° 73° 7769 5900 4119 2850 2126
08-22 49° 76° 7810 5931 4140 2862 2134
08-23 51° 82° 7855 5965 4165 2879 2146
08-24 62° 89° 7908 6009 4199 2905 2166
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 68° 90° 7965 6056 4236 2934 2191
08-26 67° 91° 8022 6103 4273 2963 2214
08-27 72° 94° 8083 6154 4314 2996 2242
08-28 69° 91° 8141 6202 4351 3025 2267
08-29 71° 92° 8200 6251 4391 3057 2293
08-30 70° 95° 8261 6302 4431 3089 2321
08-31 71° 81° 8314 6345 4465 3115 2342
09-01 60° 84° 8365 6385 4495 3137 2359
09-02 57° 76° 8409 6420 4520 3154 2370
09-03 51° 76° 8450 6451 4541 3167 2379
09-04 51° 85° 8496 6487 4567 3185 2392
09-05 64° 88° 8550 6531 4601 3211 2413
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 59° 76° 8596 6567 4627 3229 2426
09-07 49° 66° 8632 6593 4643 3237 2428
09-08 41° 70° 8665 6616 4656 3242 2429
09-09 43° 79° 8704 6645 4675 3253 2435
09-10 49° 84° 8749 6680 4699 3270 2446
09-11 53° 86° 8796 6717 4727 3289 2461
09-12 54° 89° 8846 6757 4757 3311 2477
09-13 61° 84° 8897 6798 4787 3333 2495
09-14 67° 89° 8953 6844 4823 3362 2518
09-15 63° 89° 9007 6887 4857 3387 2539
09-16 56° 88° 9057 6928 4887 3409 2556
09-17 57° 87° 9106 6967 4917 3431 2573
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 56° 88° 9156 7007 4947 3453 2590
09-19 62° 90° 9210 7051 4981 3479 2611
09-20 60° 89° 9263 7094 5013 3503 2630
09-21 64° 92° 9319 7140 5049 3531 2653
09-22 63° 77° 9367 7178 5077 3552 2668
09-23 65° 72° 9414 7214 5104 3570 2682
09-24 65° 77° 9462 7253 5133 3591 2698
09-25 61° 73° 9507 7288 5158 3608 2710
09-26 56° 79° 9553 7324 5184 3626 2722
09-27 65° 70° 9599 7360 5209 3643 2735
09-28 65° 69° 9643 7394 5234 3660 2747
09-29 65° 72° 9690 7431 5260 3678 2760
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 65° 73° 9737 7468 5288 3698 2774

 

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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