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

 
  

Zionsville, 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 32° 40° 14 4 0 0 0
02-16 19° 34° 19 4 0 0 0
02-17 6° 17° 19 4 0 0 0
02-18 5° 15° 19 4 0 0 0
02-19 12° 18° 19 4 0 0 0
02-20 3° 19° 19 4 0 0 0
02-21 12° 27° 19 4 0 0 0
02-22 11° 32° 19 4 0 0 0
02-23 21° 44° 30 5 0 0 0
02-24 33° 52° 50 16 0 0 0
02-25 37° 58° 76 31 6 0 0
02-26 32° 58° 99 45 9 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 38° 53° 123 58 13 0 0
02-28 31° 63° 148 73 18 0 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 21° 44° 158 74 18 0 0
03-02 15° 35° 161 74 18 0 0
03-03 26° 47° 176 78 18 0 0
03-04 43° 65° 208 100 30 4 0
03-05 32° 55° 229 112 32 4 0
03-06 30° 40° 243 115 32 4 0
03-07 31° 44° 258 121 32 4 0
03-08 31° 49° 276 129 32 4 0
03-09 33° 58° 300 142 35 4 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 35° 66° 329 161 44 5 0
03-11 48° 70° 366 188 61 14 4
03-12 38° 72° 398 211 73 19 4
03-13 39° 74° 433 235 88 25 6
03-14 50° 77° 474 267 110 39 14
03-15 56° 69° 515 298 131 52 22
03-16 33° 56° 538 310 133 52 22
03-17 28° 50° 555 317 133 52 22
03-18 42° 74° 591 343 149 60 25
03-19 53° 65° 628 371 167 69 30
03-20 33° 49° 647 380 167 69 30
03-21 28° 55° 667 389 167 69 30
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 38° 52° 690 403 170 69 30
03-23 34° 45° 707 410 170 69 30
03-24 36° 52° 729 422 172 69 30
03-25 37° 49° 751 433 173 69 30
03-26 30° 53° 770 443 173 69 30
03-27 38° 58° 796 459 179 69 30
03-28 49° 79° 839 491 202 84 39
03-29 61° 70° 882 525 225 99 49
03-30 56° 71° 924 556 247 113 58
03-31 35° 57° 948 570 250 113 58
04-01 29° 52° 966 579 250 113 58
04-02 45° 80° 1007 609 271 125 66
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 51° 65° 1042 635 287 133 68
04-04 44° 55° 1070 653 295 133 68
04-05 44° 59° 1100 672 304 134 68
04-06 37° 44° 1118 681 304 134 68
04-07 31° 54° 1139 691 304 134 68
04-08 26° 42° 1151 693 304 134 68
04-09 31° 45° 1166 699 304 134 68
04-10 37° 58° 1192 714 310 134 68
04-11 38° 51° 1214 726 312 134 68
04-12 31° 58° 1236 739 314 134 68
04-13 45° 63° 1268 761 326 138 68
04-14 54° 72° 1309 792 347 152 77
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 45° 54° 1337 809 355 152 77
04-16 37° 58° 1362 824 360 152 77
04-17 40° 66° 1393 845 371 155 77
04-18 56° 78° 1438 880 396 172 89
04-19 53° 72° 1479 911 417 185 97
04-20 49° 73° 1518 941 436 196 103
04-21 53° 69° 1557 970 455 207 109
04-22 47° 72° 1594 997 473 216 113
04-23 51° 77° 1636 1029 495 230 122
04-24 53° 81° 1681 1064 520 247 134
04-25 55° 71° 1722 1095 540 260 142
04-26 44° 59° 1752 1114 550 262 142
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 42° 66° 1784 1136 562 266 142
04-28 54° 82° 1830 1172 588 284 155
04-29 60° 78° 1877 1209 615 303 169
04-30 49° 70° 1914 1237 632 312 174
05-01 64° 74° 1961 1274 659 331 188
05-02 58° 71° 2004 1306 682 346 197
05-03 53° 61° 2039 1331 697 353 199
05-04 46° 52° 2066 1348 704 353 199
05-05 51° 61° 2099 1372 717 358 200
05-06 50° 71° 2138 1400 736 369 206
05-07 52° 76° 2180 1433 758 383 215
05-08 55° 71° 2221 1463 779 396 223
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 42° 68° 2254 1486 792 401 223
05-10 43° 78° 2292 1515 810 411 228
05-11 50° 80° 2335 1548 833 426 238
05-12 58° 75° 2380 1582 858 443 250
05-13 61° 73° 2425 1617 883 460 262
05-14 62° 77° 2472 1655 910 479 276
05-15 64° 87° 2526 1698 944 505 297
05-16 63° 84° 2577 1740 975 528 315
05-17 59° 70° 2620 1772 998 543 325
05-18 53° 74° 2661 1804 1019 556 333
05-19 51° 75° 2702 1835 1040 569 341
05-20 53° 67° 2740 1863 1058 579 346
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 53° 61° 2775 1888 1074 587 348
05-22 49° 57° 2806 1909 1084 589 348
05-23 41° 66° 2838 1931 1096 593 348
05-24 47° 69° 2874 1957 1112 601 351
05-25 51° 62° 2909 1981 1127 608 353
05-26 47° 71° 2946 2009 1144 617 357
05-27 58° 69° 2988 2040 1166 631 366
05-28 58° 67° 3028 2071 1186 643 373
05-29 54° 70° 3068 2101 1206 655 380
05-30 58° 75° 3113 2135 1231 672 392
05-31 56° 73° 3155 2168 1253 686 401
06-01 42° 74° 3191 2194 1269 694 404
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 48° 80° 3234 2226 1292 709 414
06-03 61° 85° 3285 2267 1323 732 432
06-04 70° 84° 3339 2312 1358 759 454
06-05 67° 74° 3388 2351 1386 779 469
06-06 67° 78° 3438 2391 1417 802 487
06-07 61° 77° 3485 2428 1443 820 500
06-08 63° 78° 3534 2466 1472 841 516
06-09 61° 76° 3580 2502 1498 859 529
06-10 55° 75° 3623 2536 1521 874 539
06-11 57° 84° 3672 2574 1550 895 555
06-12 62° 84° 3723 2615 1581 918 573
06-13 70° 78° 3775 2658 1613 942 592
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 67° 75° 3824 2697 1642 963 608
06-15 65° 79° 3874 2737 1672 985 625
06-16 66° 81° 3925 2778 1703 1008 643
06-17 69° 83° 3980 2822 1738 1035 665
06-18 69° 85° 4035 2867 1773 1062 687
06-19 68° 81° 4087 2910 1805 1086 706
06-20 64° 83° 4139 2951 1837 1110 725
06-21 70° 91° 4197 3000 1876 1141 751
06-22 75° 92° 4259 3052 1917 1174 779
06-23 74° 93° 4321 3103 1959 1208 808
06-24 75° 92° 4382 3155 2001 1242 837
06-25 75° 90° 4443 3205 2041 1274 864
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 73° 91° 4503 3255 2081 1306 891
06-27 76° 89° 4563 3305 2121 1338 918
06-28 73° 87° 4621 3354 2159 1368 943
06-29 71° 84° 4677 3399 2195 1396 966
06-30 72° 86° 4734 3447 2232 1425 990
07-01 72° 84° 4790 3493 2268 1453 1013
07-02 63° 85° 4842 3535 2300 1477 1032
07-03 68° 88° 4899 3581 2337 1506 1056
07-04 67° 89° 4954 3627 2372 1533 1078
07-05 70° 91° 5013 3675 2411 1564 1104
07-06 72° 90° 5071 3724 2449 1594 1129
07-07 69° 79° 5123 3766 2482 1619 1149
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 62° 86° 5176 3808 2514 1643 1168
07-09 71° 83° 5230 3853 2548 1669 1189
07-10 68° 88° 5286 3898 2584 1697 1212
07-11 71° 90° 5345 3947 2623 1728 1238
07-12 74° 85° 5402 3994 2660 1757 1262
07-13 70° 86° 5458 4040 2696 1785 1285
07-14 69° 85° 5512 4085 2730 1811 1306
07-15 71° 85° 5568 4131 2766 1839 1329
07-16 71° 86° 5625 4177 2803 1868 1353
07-17 70° 85° 5680 4223 2838 1895 1375
07-18 67° 82° 5733 4265 2871 1920 1395
07-19 68° 82° 5786 4308 2904 1945 1415
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 72° 82° 5841 4354 2939 1972 1437
07-21 72° 82° 5896 4398 2974 1999 1459
07-22 65° 84° 5949 4441 3007 2024 1479
07-23 65° 89° 6003 4486 3041 2050 1500
07-24 74° 92° 6064 4537 3082 2083 1528
07-25 76° 88° 6124 4587 3122 2115 1555
07-26 74° 88° 6184 4636 3162 2147 1582
07-27 75° 89° 6244 4687 3202 2179 1609
07-28 74° 87° 6303 4735 3241 2210 1635
07-29 74° 92° 6363 4786 3281 2242 1662
07-30 70° 90° 6422 4834 3320 2273 1688
07-31 66° 76° 6470 4873 3348 2293 1703
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 59° 75° 6515 4908 3374 2311 1716
08-02 58° 75° 6560 4942 3398 2327 1727
08-03 56° 79° 6605 4978 3423 2344 1739
08-04 62° 80° 6655 5017 3453 2366 1756
08-05 66° 81° 6706 5058 3484 2389 1774
08-06 64° 84° 6758 5101 3516 2413 1793
08-07 66° 87° 6813 5146 3551 2440 1815
08-08 67° 88° 6869 5191 3587 2468 1838
08-09 69° 89° 6926 5238 3624 2497 1862
08-10 68° 90° 6983 5285 3661 2526 1886
08-11 70° 89° 7040 5333 3698 2555 1910
08-12 70° 85° 7096 5378 3734 2583 1933
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 68° 85° 7150 5422 3768 2609 1954
08-14 65° 86° 7203 5466 3801 2634 1974
08-15 66° 90° 7259 5512 3837 2662 1997
08-16 70° 89° 7317 5560 3875 2692 2022
08-17 70° 88° 7374 5607 3912 2721 2046
08-18 71° 85° 7430 5652 3948 2749 2069
08-19 72° 86° 7487 5699 3985 2778 2093
08-20 69° 75° 7537 5739 4015 2800 2110
08-21 66° 75° 7585 5778 4043 2820 2125
08-22 61° 77° 7632 5815 4071 2840 2140
08-23 61° 78° 7680 5853 4099 2860 2155
08-24 60° 74° 7725 5888 4124 2877 2167
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 52° 70° 7765 5917 4143 2888 2173
08-26 49° 72° 7803 5946 4161 2898 2178
08-27 48° 76° 7843 5976 4181 2910 2185
08-28 56° 76° 7887 6010 4205 2926 2196
08-29 54° 75° 7930 6042 4228 2941 2206
08-30 50° 75° 7970 6073 4249 2954 2214
08-31 49° 77° 8012 6104 4270 2967 2222
09-01 50° 81° 8055 6138 4293 2982 2232
09-02 54° 83° 8102 6174 4320 3001 2246
09-03 54° 80° 8147 6210 4345 3018 2258
09-04 53° 69° 8186 6239 4364 3029 2264
09-05 52° 73° 8227 6269 4385 3042 2272
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 52° 68° 8265 6297 4403 3052 2277
09-07 50° 70° 8303 6325 4421 3062 2282
09-08 43° 73° 8339 6351 4437 3070 2285
09-09 47° 77° 8379 6381 4457 3082 2292
09-10 55° 83° 8426 6418 4484 3101 2306
09-11 56° 83° 8473 6456 4511 3120 2320
09-12 55° 86° 8522 6495 4540 3141 2336
09-13 57° 78° 8568 6530 4566 3159 2349
09-14 63° 87° 8621 6573 4599 3184 2369
09-15 59° 88° 8672 6615 4630 3207 2387
09-16 60° 85° 8723 6655 4661 3230 2405
09-17 57° 87° 8773 6695 4691 3252 2422
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 59° 88° 8824 6737 4722 3275 2440
09-19 60° 88° 8876 6779 4754 3299 2459
09-20 62° 88° 8929 6822 4787 3324 2479
09-21 65° 81° 8980 6863 4818 3347 2497
09-22 64° 71° 9026 6898 4844 3365 2510
09-23 63° 77° 9074 6936 4872 3385 2525
09-24 64° 78° 9123 6976 4901 3406 2541
09-25 62° 76° 9170 7013 4928 3425 2555
09-26 53° 80° 9215 7047 4953 3442 2567
09-27 53° 85° 9262 7084 4980 3461 2581
09-28 57° 88° 9312 7125 5010 3483 2598
09-29 58° 88° 9363 7166 5041 3506 2616
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 59° 84° 9413 7205 5071 3528 2633
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 33° 48° 18 8 0 0 0
02-16 20° 32° 22 8 0 0 0
02-17 13° 21° 22 8 0 0 0
02-18 14° 34° 24 8 0 0 0
02-19 17° 46° 34 8 0 0 0
02-20 26° 56° 53 18 0 0 0
02-21 35° 64° 81 35 7 0 0
02-22 43° 54° 107 52 14 0 0
02-23 36° 51° 128 63 15 0 0
02-24 25° 43° 141 65 15 0 0
02-25 26° 59° 161 76 16 0 0
02-26 35° 71° 193 97 27 3 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 59° 68° 234 128 49 17 8
02-28 27° 66° 258 143 53 17 8
02-29 19° 43° 267 143 53 17 8
03-01 28° 44° 281 146 53 17 8
03-02 40° 54° 306 161 58 17 8
03-03 40° 69° 338 184 70 21 8
03-04 53° 75° 380 216 92 35 17
03-05 50° 63° 415 240 107 41 19
03-06 43° 49° 439 254 111 41 19
03-07 43° 48° 463 268 115 41 19
03-08 45° 56° 491 287 123 42 19
03-09 39° 55° 516 301 128 42 19
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 30° 45° 532 307 128 42 19
03-11 26° 59° 552 318 129 42 19
03-12 42° 68° 585 341 142 47 19
03-13 47° 73° 624 369 160 57 24
03-14 55° 73° 665 401 182 71 33
03-15 43° 59° 694 420 191 72 33
03-16 36° 61° 721 436 197 72 33
03-17 35° 46° 739 445 197 72 33
03-18 30° 34° 750 445 197 72 33
03-19 27° 55° 768 454 197 72 33
03-20 32° 49° 787 462 197 72 33
03-21 25° 42° 798 464 197 72 33
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 32° 46° 815 470 197 72 33
03-23 30° 44° 830 476 197 72 33
03-24 29° 52° 849 484 197 72 33
03-25 44° 67° 882 508 211 78 34
03-26 41° 61° 911 527 220 79 34
03-27 34° 44° 928 534 220 79 34
03-28 28° 57° 949 544 220 79 34
03-29 39° 68° 980 566 231 82 34
03-30 53° 74° 1021 597 253 95 42
03-31 42° 66° 1053 619 265 99 42
04-01 45° 60° 1084 639 275 102 42
04-02 42° 66° 1116 661 287 106 42
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 35° 41° 1132 668 287 106 42
04-04 35° 40° 1147 673 287 106 42
04-05 37° 45° 1166 682 287 106 42
04-06 30° 57° 1187 693 289 106 42
04-07 38° 62° 1216 711 297 106 42
04-08 46° 75° 1254 740 315 117 47
04-09 53° 72° 1294 770 336 129 55
04-10 52° 61° 1329 795 350 136 56
04-11 49° 59° 1361 817 362 140 56
04-12 46° 58° 1391 837 373 142 56
04-13 42° 68° 1425 860 386 147 57
04-14 57° 80° 1471 897 412 166 70
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 60° 75° 1516 932 438 183 82
04-16 59° 79° 1563 969 465 202 96
04-17 65° 71° 1609 1005 490 220 109
04-18 48° 74° 1649 1034 510 231 116
04-19 47° 65° 1683 1059 524 238 117
04-20 40° 51° 1706 1072 528 238 117
04-21 35° 44° 1724 1080 528 238 117
04-22 35° 63° 1751 1096 535 238 117
04-23 49° 62° 1784 1120 548 243 118
04-24 40° 50° 1808 1133 552 243 118
04-25 40° 60° 1836 1152 560 243 118
04-26 43° 68° 1869 1175 573 249 118
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 61° 78° 1917 1213 601 268 133
04-28 67° 80° 1968 1254 632 291 151
04-29 62° 71° 2013 1288 656 308 162
04-30 56° 75° 2056 1322 680 324 173
05-01 58° 80° 2103 1359 707 343 187
05-02 59° 85° 2153 1399 737 365 204
05-03 64° 76° 2201 1437 765 384 219
05-04 60° 81° 2249 1475 793 405 234
05-05 61° 73° 2295 1510 819 422 247
05-06 58° 76° 2340 1546 844 439 259
05-07 61° 79° 2388 1584 872 460 274
05-08 59° 80° 2436 1621 899 479 288
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 52° 68° 2474 1649 917 489 293
05-10 49° 66° 2509 1675 933 497 296
05-11 55° 70° 2550 1705 953 509 303
05-12 47° 79° 2591 1736 974 522 311
05-13 56° 79° 2636 1772 1000 540 324
05-14 60° 68° 2678 1804 1022 554 333
05-15 60° 69° 2721 1837 1045 569 343
05-16 56° 74° 2764 1870 1068 584 353
05-17 63° 74° 2810 1906 1094 602 366
05-18 61° 79° 2859 1944 1122 622 381
05-19 62° 85° 2910 1986 1154 645 400
05-20 65° 85° 2963 2028 1187 670 419
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 66° 86° 3016 2072 1220 696 440
05-22 68° 81° 3069 2115 1253 720 460
05-23 57° 78° 3115 2150 1278 738 472
05-24 62° 81° 3165 2190 1308 760 489
05-25 60° 78° 3212 2227 1336 779 503
05-26 60° 75° 3257 2263 1361 797 516
05-27 61° 72° 3302 2298 1386 813 528
05-28 56° 73° 3344 2330 1408 828 537
05-29 53° 70° 3384 2360 1428 840 544
05-30 49° 74° 3424 2390 1448 852 551
05-31 55° 77° 3468 2424 1472 868 562
06-01 61° 73° 3513 2459 1497 885 574
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 63° 76° 3561 2496 1525 904 589
06-03 61° 84° 3611 2537 1555 926 606
06-04 66° 83° 3663 2579 1587 951 625
06-05 69° 81° 3716 2622 1620 976 645
06-06 63° 81° 3766 2662 1650 997 662
06-07 58° 81° 3814 2699 1677 1017 676
06-08 56° 81° 3860 2736 1704 1036 690
06-09 56° 79° 3906 2771 1729 1053 702
06-10 56° 69° 3946 2802 1750 1066 710
06-11 44° 76° 3985 2830 1768 1076 715
06-12 56° 85° 4033 2869 1797 1097 731
06-13 66° 88° 4088 2914 1832 1124 753
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 67° 86° 4143 2958 1866 1150 774
06-15 63° 85° 4195 3001 1899 1174 794
06-16 62° 91° 4250 3045 1934 1201 815
06-17 75° 93° 4312 3098 1976 1235 845
06-18 72° 82° 4367 3143 2011 1263 867
06-19 75° 90° 4428 3194 2052 1295 895
06-20 71° 91° 4487 3243 2091 1327 921
06-21 70° 91° 4546 3292 2130 1357 947
06-22 73° 91° 4606 3342 2170 1390 974
06-23 73° 84° 4663 3388 2206 1418 997
06-24 62° 85° 4714 3430 2238 1442 1016
06-25 70° 84° 4769 3475 2273 1469 1038
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 68° 77° 4820 3515 2304 1491 1055
06-27 63° 80° 4869 3555 2333 1513 1072
06-28 65° 86° 4923 3598 2367 1538 1092
06-29 73° 81° 4978 3644 2402 1565 1115
06-30 59° 75° 5023 3679 2427 1583 1127
07-01 53° 74° 5065 3710 2449 1596 1136
07-02 57° 84° 5113 3749 2477 1617 1151
07-03 71° 85° 5169 3795 2513 1645 1174
07-04 69° 78° 5221 3837 2545 1668 1193
07-05 66° 82° 5273 3879 2577 1692 1212
07-06 63° 80° 5323 3918 2607 1714 1228
07-07 63° 85° 5375 3960 2638 1738 1247
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 66° 87° 5429 4005 2673 1765 1269
07-09 70° 77° 5481 4047 2705 1788 1288
07-10 64° 81° 5532 4087 2735 1811 1305
07-11 65° 80° 5582 4128 2766 1834 1323
07-12 67° 85° 5636 4171 2800 1859 1343
07-13 67° 88° 5692 4217 2835 1887 1366
07-14 72° 85° 5748 4264 2872 1916 1390
07-15 69° 90° 5805 4311 2909 1945 1414
07-16 68° 84° 5860 4355 2943 1971 1435
07-17 71° 84° 5915 4401 2979 1999 1458
07-18 57° 74° 5959 4435 3003 2014 1469
07-19 56° 79° 6005 4470 3028 2032 1481
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 58° 79° 6052 4507 3055 2051 1495
07-21 62° 80° 6101 4546 3085 2072 1511
07-22 66° 81° 6152 4588 3116 2096 1530
07-23 62° 84° 6203 4629 3147 2119 1548
07-24 66° 81° 6255 4671 3179 2142 1567
07-25 66° 81° 6306 4712 3210 2166 1585
07-26 58° 82° 6354 4750 3238 2186 1600
07-27 58° 84° 6403 4789 3267 2207 1616
07-28 66° 79° 6454 4830 3298 2230 1634
07-29 69° 82° 6508 4873 3331 2255 1654
07-30 70° 87° 6565 4920 3368 2284 1678
07-31 69° 83° 6619 4964 3402 2310 1699
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 70° 88° 6676 5011 3439 2339 1723
08-02 70° 83° 6730 5056 3474 2366 1745
08-03 67° 86° 6785 5100 3508 2392 1766
08-04 67° 88° 6840 5145 3544 2419 1789
08-05 70° 90° 6898 5194 3582 2449 1814
08-06 72° 91° 6957 5243 3621 2481 1840
08-07 66° 77° 7007 5283 3651 2503 1857
08-08 62° 82° 7057 5323 3681 2525 1874
08-09 63° 78° 7106 5361 3709 2545 1889
08-10 54° 75° 7148 5394 3732 2559 1899
08-11 54° 76° 7191 5427 3755 2575 1909
08-12 54° 79° 7236 5461 3779 2591 1920
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 58° 82° 7284 5499 3808 2611 1936
08-14 58° 85° 7333 5539 3837 2633 1952
08-15 65° 80° 7384 5579 3868 2655 1970
08-16 68° 84° 7438 5624 3902 2682 1991
08-17 68° 82° 7491 5667 3935 2706 2011
08-18 67° 78° 7541 5707 3965 2729 2028
08-19 62° 76° 7588 5744 3992 2748 2042
08-20 55° 71° 7629 5775 4013 2761 2050
08-21 50° 73° 7669 5805 4033 2773 2057
08-22 50° 77° 7710 5836 4054 2786 2065
08-23 51° 83° 7756 5871 4079 2803 2077
08-24 62° 89° 7809 5915 4113 2828 2098
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 66° 91° 7865 5961 4149 2857 2121
08-26 67° 91° 7923 6008 4186 2886 2145
08-27 73° 94° 7984 6060 4228 2919 2174
08-28 68° 87° 8039 6105 4263 2947 2196
08-29 70° 91° 8098 6153 4302 2977 2222
08-30 70° 94° 8158 6204 4342 3010 2249
08-31 68° 81° 8211 6246 4375 3034 2269
09-01 59° 82° 8259 6285 4403 3055 2284
09-02 56° 75° 8303 6319 4427 3070 2295
09-03 51° 76° 8344 6350 4448 3084 2303
09-04 50° 86° 8390 6386 4474 3102 2316
09-05 64° 87° 8444 6430 4508 3128 2337
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 58° 73° 8488 6464 4532 3143 2348
09-07 48° 65° 8523 6488 4547 3150 2350
09-08 41° 69° 8556 6511 4560 3155 2350
09-09 44° 77° 8594 6540 4578 3166 2355
09-10 50° 84° 8639 6575 4603 3183 2367
09-11 54° 87° 8688 6613 4631 3203 2382
09-12 55° 89° 8738 6653 4662 3225 2400
09-13 60° 84° 8788 6694 4692 3248 2417
09-14 66° 89° 8844 6740 4728 3275 2440
09-15 62° 88° 8897 6783 4761 3301 2460
09-16 56° 88° 8948 6823 4791 3323 2477
09-17 57° 86° 8997 6863 4821 3344 2494
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 56° 88° 9047 6902 4851 3366 2511
09-19 61° 89° 9100 6945 4883 3391 2530
09-20 60° 88° 9152 6987 4916 3415 2550
09-21 64° 91° 9207 7033 4951 3443 2572
09-22 64° 76° 9255 7071 4979 3463 2587
09-23 65° 70° 9301 7106 5005 3480 2600
09-24 64° 77° 9350 7145 5033 3501 2615
09-25 61° 72° 9394 7180 5058 3518 2627
09-26 56° 79° 9440 7216 5084 3535 2640
09-27 64° 68° 9484 7250 5108 3552 2651
09-28 63° 72° 9530 7286 5134 3569 2664
09-29 65° 72° 9577 7322 5161 3588 2678
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 66° 73° 9624 7360 5188 3608 2692

 

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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