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

 
  

W Mifflin Fin, PA

        

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 27° 39° 11 1 0 0 0
02-16 25° 41° 22 2 0 0 0
02-17 15° 25° 22 2 0 0 0
02-18 8° 18° 22 2 0 0 0
02-19 6° 22° 22 2 0 0 0
02-20 12° 21° 22 2 0 0 0
02-21 17° 26° 22 2 0 0 0
02-22 20° 36° 28 2 0 0 0
02-23 21° 38° 36 2 0 0 0
02-24 30° 55° 56 12 0 0 0
02-25 37° 52° 78 25 3 0 0
02-26 29° 51° 96 33 3 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 36° 49° 117 43 3 0 0
02-28 32° 50° 136 53 3 0 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 19° 50° 149 55 3 0 0
03-02 16° 29° 149 55 3 0 0
03-03 19° 41° 157 55 3 0 0
03-04 36° 68° 187 75 14 2 0
03-05 40° 64° 218 96 24 5 0
03-06 32° 39° 231 99 24 5 0
03-07 26° 47° 246 103 24 5 0
03-08 27° 37° 256 104 24 5 0
03-09 26° 55° 274 112 24 5 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 35° 64° 302 130 32 5 0
03-11 38° 73° 335 153 45 10 1
03-12 36° 71° 367 175 57 13 1
03-13 38° 73° 400 198 70 19 1
03-14 40° 79° 438 226 88 29 6
03-15 56° 74° 481 259 111 43 16
03-16 52° 69° 519 287 129 54 21
03-17 32° 48° 537 295 129 54 21
03-18 28° 68° 563 311 135 54 21
03-19 44° 80° 603 341 155 66 28
03-20 37° 67° 633 361 165 67 28
03-21 32° 52° 653 371 165 67 28
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 33° 48° 672 379 165 67 28
03-23 23° 46° 684 382 165 67 28
03-24 44° 55° 711 399 172 67 28
03-25 32° 52° 731 409 172 67 28
03-26 31° 45° 747 415 172 67 28
03-27 25° 58° 767 425 172 67 28
03-28 45° 59° 797 445 182 70 28
03-29 57° 75° 841 479 206 86 39
03-30 59° 70° 884 512 229 100 49
03-31 42° 64° 915 533 240 104 49
04-01 34° 47° 933 541 240 104 49
04-02 36° 64° 961 559 248 104 49
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 56° 72° 1003 591 270 118 57
04-04 51° 58° 1036 614 283 122 57
04-05 54° 70° 1076 644 303 135 65
04-06 39° 56° 1102 660 309 135 65
04-07 33° 53° 1123 671 310 135 65
04-08 26° 39° 1134 671 310 135 65
04-09 24° 51° 1149 677 310 135 65
04-10 40° 49° 1172 689 313 135 65
04-11 39° 46° 1192 700 313 135 65
04-12 38° 46° 1213 711 314 135 65
04-13 30° 62° 1237 725 318 135 65
04-14 49° 76° 1277 755 338 147 72
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 41° 64° 1308 776 349 150 72
04-16 39° 53° 1332 790 353 150 72
04-17 29° 62° 1356 804 357 150 72
04-18 47° 84° 1399 837 380 165 83
04-19 69° 84° 1454 882 415 192 104
04-20 52° 69° 1492 910 434 202 110
04-21 59° 79° 1540 947 461 221 124
04-22 49° 69° 1577 975 478 231 128
04-23 46° 78° 1617 1005 498 243 135
04-24 52° 84° 1662 1040 524 260 148
04-25 63° 75° 1710 1077 551 279 162
04-26 46° 64° 1743 1101 564 285 162
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 37° 64° 1772 1119 573 285 162
04-28 37° 78° 1807 1145 588 293 165
04-29 58° 84° 1856 1184 617 314 181
04-30 47° 71° 1893 1211 634 323 185
05-01 53° 82° 1939 1247 660 341 198
05-02 60° 76° 1985 1283 686 359 211
05-03 59° 65° 2025 1313 706 371 218
05-04 57° 68° 2066 1344 727 384 226
05-05 51° 72° 2106 1374 747 396 233
05-06 50° 60° 2139 1397 760 401 233
05-07 52° 69° 2177 1425 779 411 238
05-08 51° 70° 2216 1453 797 421 243
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 46° 61° 2247 1475 808 425 243
05-10 39° 75° 2282 1500 823 432 246
05-11 49° 80° 2324 1532 845 446 255
05-12 54° 80° 2369 1567 871 463 267
05-13 63° 68° 2413 1601 894 479 278
05-14 59° 75° 2457 1635 919 495 289
05-15 57° 83° 2505 1673 946 515 304
05-16 69° 80° 2558 1716 979 540 324
05-17 62° 74° 2604 1752 1005 558 337
05-18 57° 70° 2645 1783 1026 571 345
05-19 49° 66° 2681 1809 1042 579 347
05-20 43° 67° 2714 1832 1055 584 347
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 56° 71° 2755 1863 1076 597 356
05-22 51° 57° 2787 1885 1088 601 356
05-23 47° 57° 2817 1905 1098 603 356
05-24 45° 63° 2849 1927 1111 607 356
05-25 41° 63° 2879 1947 1121 609 356
05-26 41° 69° 2913 1971 1134 615 356
05-27 51° 67° 2950 1998 1151 624 360
05-28 52° 58° 2982 2020 1164 628 360
05-29 57° 72° 3025 2053 1186 643 370
05-30 55° 66° 3063 2081 1205 653 375
05-31 46° 57° 3093 2101 1214 655 375
06-01 41° 63° 3123 2121 1224 657 375
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 40° 74° 3158 2145 1239 663 377
06-03 48° 84° 3201 2179 1262 679 388
06-04 58° 86° 3251 2219 1293 701 405
06-05 63° 85° 3304 2261 1325 725 424
06-06 66° 78° 3354 2301 1355 747 441
06-07 64° 77° 3402 2340 1383 768 457
06-08 63° 72° 3447 2375 1408 785 469
06-09 60° 79° 3494 2412 1436 804 483
06-10 62° 75° 3541 2449 1462 823 497
06-11 55° 81° 3587 2485 1489 841 510
06-12 61° 86° 3639 2527 1520 865 529
06-13 67° 84° 3693 2571 1554 891 549
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 69° 79° 3744 2612 1586 914 568
06-15 69° 77° 3795 2653 1617 937 586
06-16 65° 75° 3843 2691 1644 957 601
06-17 67° 79° 3895 2732 1676 980 619
06-18 70° 84° 3950 2777 1711 1007 641
06-19 62° 79° 3998 2816 1739 1028 657
06-20 61° 82° 4047 2855 1769 1049 673
06-21 66° 87° 4102 2900 1803 1076 695
06-22 70° 92° 4161 2949 1842 1107 721
06-23 74° 93° 4223 3000 1884 1140 749
06-24 73° 94° 4284 3052 1925 1174 778
06-25 73° 91° 4344 3102 1965 1206 805
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 70° 89° 4402 3150 2003 1236 830
06-27 71° 87° 4459 3197 2040 1265 854
06-28 71° 83° 4514 3242 2075 1292 876
06-29 68° 84° 4568 3286 2109 1318 897
06-30 71° 87° 4625 3333 2146 1347 921
07-01 70° 77° 4676 3374 2177 1370 939
07-02 64° 84° 4728 3416 2209 1394 958
07-03 64° 85° 4780 3458 2242 1418 977
07-04 62° 84° 4831 3499 2272 1441 995
07-05 64° 88° 4885 3543 2307 1467 1016
07-06 68° 90° 4942 3590 2343 1496 1040
07-07 70° 90° 5000 3638 2381 1526 1065
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 71° 82° 5054 3682 2415 1552 1086
07-09 67° 79° 5105 3723 2446 1575 1104
07-10 65° 84° 5157 3765 2478 1599 1123
07-11 67° 87° 5212 3810 2513 1626 1145
07-12 71° 91° 5271 3859 2552 1657 1171
07-13 71° 86° 5328 3906 2589 1686 1194
07-14 71° 83° 5382 3950 2624 1712 1216
07-15 68° 88° 5438 3996 2660 1740 1239
07-16 71° 84° 5494 4042 2695 1768 1261
07-17 71° 86° 5550 4088 2731 1796 1285
07-18 69° 75° 5601 4129 2762 1819 1302
07-19 71° 85° 5656 4174 2798 1846 1325
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 73° 83° 5712 4220 2834 1874 1348
07-21 63° 79° 5762 4259 2863 1895 1364
07-22 58° 81° 5809 4297 2890 1915 1379
07-23 59° 88° 5860 4338 2922 1938 1397
07-24 70° 90° 5919 4387 2960 1969 1422
07-25 75° 88° 5978 4436 2999 2000 1449
07-26 72° 90° 6037 4485 3038 2031 1475
07-27 72° 86° 6094 4532 3075 2060 1499
07-28 72° 90° 6153 4581 3114 2091 1525
07-29 73° 89° 6212 4630 3153 2122 1550
07-30 72° 91° 6271 4679 3192 2153 1577
07-31 64° 81° 6322 4720 3223 2176 1595
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 61° 77° 6369 4757 3250 2195 1609
08-02 58° 77° 6414 4792 3275 2212 1621
08-03 52° 80° 6458 4826 3299 2228 1632
08-04 54° 83° 6505 4863 3326 2247 1646
08-05 60° 83° 6555 4903 3356 2269 1662
08-06 64° 83° 6606 4944 3387 2292 1681
08-07 61° 82° 6655 4983 3416 2313 1697
08-08 63° 84° 6707 5025 3448 2337 1716
08-09 62° 87° 6759 5067 3480 2361 1735
08-10 62° 88° 6812 5110 3513 2386 1755
08-11 64° 89° 6867 5155 3548 2413 1777
08-12 67° 92° 6925 5203 3586 2443 1802
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 71° 84° 6980 5248 3622 2470 1824
08-14 70° 84° 7036 5293 3657 2497 1846
08-15 62° 88° 7089 5336 3690 2522 1866
08-16 65° 90° 7144 5382 3725 2550 1889
08-17 70° 85° 7200 5428 3761 2578 1911
08-18 66° 82° 7251 5469 3793 2601 1930
08-19 62° 88° 7305 5513 3826 2627 1950
08-20 70° 80° 7358 5556 3859 2652 1970
08-21 68° 79° 7409 5597 3890 2675 1989
08-22 64° 82° 7460 5638 3921 2698 2007
08-23 64° 86° 7513 5681 3954 2723 2027
08-24 66° 82° 7565 5723 3987 2747 2046
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 58° 74° 7610 5758 4011 2764 2057
08-26 53° 70° 7649 5787 4030 2775 2064
08-27 49° 73° 7689 5816 4050 2786 2070
08-28 46° 75° 7727 5845 4068 2797 2076
08-29 55° 69° 7767 5875 4088 2809 2083
08-30 45° 71° 7803 5901 4104 2817 2086
08-31 46° 76° 7842 5930 4123 2828 2091
09-01 48° 77° 7882 5960 4143 2840 2099
09-02 54° 77° 7926 5994 4167 2856 2109
09-03 51° 82° 7970 6028 4191 2872 2121
09-04 58° 67° 8011 6059 4212 2885 2129
09-05 57° 79° 8057 6095 4238 2903 2142
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 55° 70° 8098 6126 4259 2916 2149
09-07 51° 68° 8136 6154 4277 2926 2154
09-08 41° 71° 8169 6177 4291 2931 2155
09-09 44° 75° 8207 6205 4308 2941 2160
09-10 48° 77° 8247 6235 4329 2953 2167
09-11 49° 79° 8289 6267 4351 2967 2176
09-12 51° 83° 8334 6302 4375 2984 2188
09-13 51° 83° 8380 6338 4401 3002 2200
09-14 55° 84° 8427 6375 4428 3021 2215
09-15 58° 83° 8476 6414 4457 3042 2230
09-16 59° 81° 8524 6452 4485 3062 2246
09-17 57° 83° 8572 6490 4513 3082 2261
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 54° 85° 8620 6528 4541 3102 2275
09-19 55° 83° 8667 6565 4568 3121 2289
09-20 59° 84° 8716 6604 4597 3142 2306
09-21 63° 85° 8768 6646 4629 3166 2325
09-22 66° 84° 8821 6689 4662 3191 2345
09-23 65° 74° 8869 6727 4690 3211 2360
09-24 62° 71° 8914 6762 4715 3228 2371
09-25 64° 72° 8959 6797 4741 3245 2384
09-26 58° 76° 9005 6832 4766 3262 2396
09-27 57° 76° 9049 6867 4790 3279 2408
09-28 55° 82° 9095 6903 4816 3297 2421
09-29 56° 79° 9141 6938 4842 3314 2433
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 58° 79° 9187 6975 4868 3333 2447
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 21° 56° 17 7 0 0 0
02-16 27° 39° 27 7 0 0 0
02-17 20° 29° 30 7 0 0 0
02-18 18° 38° 36 7 0 0 0
02-19 20° 42° 45 7 0 0 0
02-20 20° 51° 58 11 0 0 0
02-21 25° 59° 78 21 0 0 0
02-22 42° 48° 101 34 4 0 0
02-23 39° 56° 127 50 9 0 0
02-24 23° 37° 135 50 9 0 0
02-25 18° 47° 146 50 9 0 0
02-26 34° 64° 173 67 16 0 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 45° 63° 205 89 28 4 0
02-28 27° 62° 227 102 31 4 0
02-29 23° 37° 235 102 31 4 0
03-01 24° 52° 251 108 31 4 0
03-02 42° 53° 276 123 36 4 0
03-03 45° 66° 310 147 50 10 1
03-04 42° 75° 346 173 66 18 4
03-05 48° 74° 385 202 85 29 10
03-06 50° 61° 419 226 98 34 10
03-07 44° 50° 444 241 103 34 10
03-08 41° 63° 474 261 114 37 10
03-09 41° 55° 500 277 120 37 10
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 32° 41° 514 281 120 37 10
03-11 30° 50° 533 290 120 37 10
03-12 41° 68° 565 312 132 41 10
03-13 45° 70° 601 338 148 49 13
03-14 44° 74° 638 365 165 58 17
03-15 45° 59° 668 385 175 60 17
03-16 33° 60° 692 399 179 60 17
03-17 36° 55° 716 413 183 60 17
03-18 28° 36° 726 413 183 60 17
03-19 31° 45° 742 419 183 60 17
03-20 30° 48° 759 426 183 60 17
03-21 22° 40° 768 426 183 60 17
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 25° 54° 786 434 183 60 17
03-23 30° 45° 802 440 183 60 17
03-24 26° 48° 817 445 183 60 17
03-25 35° 66° 846 463 192 60 17
03-26 45° 51° 872 479 198 60 17
03-27 44° 60° 902 500 208 63 17
03-28 34° 52° 923 511 209 63 17
03-29 36° 53° 945 523 211 63 17
03-30 32° 53° 966 533 212 63 17
03-31 44° 59° 995 553 221 64 17
04-01 48° 63° 1028 576 234 70 17
04-02 53° 65° 1066 604 252 79 21
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 39° 60° 1094 621 260 79 21
04-04 37° 44° 1112 630 260 79 21
04-05 36° 41° 1129 636 260 79 21
04-06 36° 52° 1151 648 262 79 21
04-07 31° 59° 1174 662 265 79 21
04-08 49° 74° 1213 691 284 90 28
04-09 48° 75° 1253 721 304 102 35
04-10 57° 65° 1292 750 323 113 41
04-11 59° 70° 1335 783 346 128 50
04-12 47° 59° 1366 804 357 131 50
04-13 45° 61° 1397 825 368 134 50
04-14 44° 81° 1438 856 389 147 58
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 57° 70° 1480 887 411 161 67
04-16 47° 75° 1519 917 430 172 73
04-17 62° 80° 1568 956 459 193 89
04-18 57° 71° 1610 988 481 207 99
04-19 53° 68° 1649 1017 500 218 104
04-20 43° 59° 1678 1036 509 219 104
04-21 36° 46° 1697 1044 509 219 104
04-22 31° 61° 1721 1058 513 219 104
04-23 41° 67° 1753 1080 525 223 104
04-24 43° 60° 1782 1100 534 224 104
04-25 41° 57° 1809 1117 541 224 104
04-26 38° 69° 1840 1138 552 228 104
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 53° 77° 1883 1171 576 243 114
04-28 62° 82° 1933 1211 605 265 131
04-29 60° 82° 1982 1250 635 286 147
04-30 61° 71° 2026 1284 659 302 158
05-01 51° 80° 2070 1317 682 317 169
05-02 59° 84° 2119 1357 711 338 185
05-03 57° 86° 2168 1396 740 360 201
05-04 56° 64° 2206 1424 758 370 206
05-05 56° 76° 2250 1458 782 386 217
05-06 59° 72° 2294 1492 806 401 228
05-07 59° 76° 2339 1527 831 418 240
05-08 66° 80° 2390 1568 862 441 258
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 54° 65° 2428 1596 880 451 263
05-10 48° 59° 2459 1617 891 455 263
05-11 43° 58° 2488 1636 900 455 263
05-12 48° 63° 2521 1659 913 460 263
05-13 45° 80° 2562 1689 934 473 270
05-14 57° 67° 2602 1720 954 485 278
05-15 61° 75° 2648 1755 980 503 290
05-16 60° 76° 2693 1791 1005 521 303
05-17 57° 68° 2734 1822 1026 533 311
05-18 62° 78° 2782 1860 1054 553 326
05-19 59° 82° 2831 1898 1083 574 341
05-20 58° 85° 2880 1938 1112 595 358
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 63° 85° 2932 1980 1144 619 377
05-22 63° 83° 2983 2021 1175 642 395
05-23 66° 77° 3033 2060 1205 664 412
05-24 63° 83° 3083 2101 1236 687 429
05-25 61° 82° 3133 2141 1265 708 446
05-26 64° 81° 3184 2181 1296 731 464
05-27 63° 76° 3231 2219 1323 751 478
05-28 56° 72° 3273 2251 1345 764 487
05-29 54° 64° 3310 2278 1362 773 491
05-30 49° 67° 3346 2304 1378 781 494
05-31 43° 74° 3382 2330 1394 790 497
06-01 47° 81° 3424 2362 1416 803 506
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 61° 69° 3467 2395 1439 818 516
06-03 64° 81° 3518 2435 1470 841 534
06-04 60° 86° 3569 2477 1501 864 552
06-05 68° 79° 3621 2518 1533 888 570
06-06 69° 77° 3672 2560 1564 911 589
06-07 59° 71° 3715 2593 1587 926 599
06-08 54° 78° 3759 2627 1611 942 610
06-09 61° 74° 3804 2662 1636 959 622
06-10 52° 65° 3841 2689 1653 968 626
06-11 51° 71° 3880 2718 1672 979 632
06-12 51° 80° 3923 2751 1695 995 642
06-13 55° 86° 3972 2790 1724 1015 658
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 65° 79° 4022 2830 1754 1037 675
06-15 54° 78° 4066 2864 1778 1053 686
06-16 55° 88° 4115 2903 1807 1074 702
06-17 66° 92° 4172 2950 1844 1103 726
06-18 67° 91° 4229 2997 1881 1132 750
06-19 72° 89° 4288 3046 1920 1163 776
06-20 70° 91° 4346 3094 1958 1193 801
06-21 70° 93° 4406 3143 1998 1225 828
06-22 72° 93° 4466 3194 2039 1258 855
06-23 72° 85° 4523 3241 2075 1286 879
06-24 64° 79° 4573 3281 2105 1308 896
06-25 61° 84° 4623 3321 2135 1330 913
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 67° 86° 4677 3365 2170 1357 934
06-27 65° 78° 4727 3405 2199 1378 951
06-28 57° 86° 4777 3444 2229 1400 967
06-29 75° 85° 4835 3492 2267 1430 992
06-30 61° 84° 4885 3533 2297 1452 1010
07-01 53° 76° 4927 3565 2320 1467 1019
07-02 55° 83° 4974 3602 2346 1486 1033
07-03 67° 91° 5032 3649 2384 1515 1058
07-04 73° 87° 5090 3698 2422 1545 1083
07-05 74° 85° 5147 3745 2459 1575 1107
07-06 70° 86° 5203 3791 2495 1602 1130
07-07 64° 87° 5257 3835 2529 1628 1151
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 66° 91° 5313 3881 2566 1657 1174
07-09 67° 90° 5370 3928 2602 1686 1198
07-10 68° 92° 5428 3976 2640 1715 1223
07-11 67° 78° 5479 4017 2671 1738 1241
07-12 61° 90° 5532 4060 2704 1763 1261
07-13 66° 93° 5590 4107 2742 1793 1286
07-14 69° 93° 5648 4156 2781 1824 1311
07-15 70° 94° 5709 4206 2821 1856 1339
07-16 72° 92° 5769 4257 2861 1888 1366
07-17 69° 82° 5823 4300 2895 1914 1386
07-18 67° 80° 5874 4342 2926 1938 1405
07-19 57° 84° 5923 4380 2955 1958 1421
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 63° 87° 5976 4424 2988 1983 1441
07-21 61° 84° 6026 4464 3019 2006 1458
07-22 67° 76° 6076 4504 3048 2027 1475
07-23 63° 83° 6127 4545 3080 2051 1493
07-24 66° 84° 6181 4589 3113 2076 1514
07-25 66° 83° 6234 4631 3146 2101 1533
07-26 58° 83° 6282 4670 3174 2121 1549
07-27 59° 88° 6333 4711 3206 2145 1567
07-28 61° 93° 6388 4756 3240 2171 1589
07-29 64° 84° 6440 4798 3272 2196 1608
07-30 71° 79° 6493 4841 3305 2221 1628
07-31 69° 90° 6551 4889 3343 2250 1653
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 72° 91° 6611 4938 3383 2282 1680
08-02 72° 84° 6667 4984 3419 2310 1703
08-03 71° 80° 6720 5028 3452 2335 1723
08-04 69° 86° 6776 5073 3488 2363 1745
08-05 65° 90° 6831 5119 3523 2390 1768
08-06 68° 90° 6888 5166 3560 2420 1792
08-07 67° 78° 6939 5207 3591 2442 1810
08-08 70° 84° 6994 5252 3626 2469 1832
08-09 71° 82° 7048 5296 3660 2496 1853
08-10 62° 77° 7096 5334 3688 2516 1868
08-11 56° 77° 7141 5368 3713 2532 1880
08-12 57° 78° 7186 5404 3738 2550 1892
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 54° 80° 7231 5439 3763 2566 1904
08-14 57° 82° 7279 5477 3791 2586 1919
08-15 56° 86° 7328 5516 3820 2608 1935
08-16 69° 83° 7382 5560 3854 2633 1956
08-17 67° 85° 7437 5604 3889 2660 1977
08-18 67° 78° 7487 5645 3919 2682 1995
08-19 62° 68° 7530 5678 3943 2698 2005
08-20 56° 67° 7570 5708 3962 2709 2012
08-21 48° 70° 7607 5735 3979 2718 2016
08-22 47° 75° 7646 5764 3998 2729 2022
08-23 50° 82° 7690 5798 4022 2745 2033
08-24 53° 87° 7738 5836 4050 2765 2048
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 58° 86° 7788 5875 4080 2787 2065
08-26 69° 87° 7844 5922 4116 2815 2088
08-27 68° 94° 7903 5971 4155 2846 2114
08-28 72° 92° 7963 6021 4195 2878 2141
08-29 72° 89° 8022 6069 4234 2909 2167
08-30 69° 90° 8079 6117 4271 2938 2191
08-31 70° 81° 8133 6161 4305 2964 2212
09-01 68° 85° 8188 6206 4340 2991 2234
09-02 54° 72° 8229 6237 4361 3004 2242
09-03 47° 75° 8268 6266 4380 3015 2248
09-04 49° 79° 8310 6298 4402 3029 2257
09-05 53° 82° 8355 6333 4427 3047 2269
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 54° 87° 8404 6371 4456 3067 2285
09-07 53° 67° 8441 6399 4474 3077 2289
09-08 45° 68° 8476 6424 4488 3083 2291
09-09 46° 75° 8515 6452 4507 3094 2296
09-10 54° 80° 8560 6487 4532 3111 2309
09-11 54° 85° 8607 6525 4559 3130 2323
09-12 57° 84° 8655 6563 4587 3151 2338
09-13 56° 82° 8703 6600 4615 3170 2353
09-14 58° 85° 8752 6640 4644 3191 2369
09-15 59° 84° 8802 6680 4674 3213 2386
09-16 56° 79° 8847 6715 4699 3230 2398
09-17 60° 79° 8894 6752 4727 3250 2412
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 65° 75° 8943 6790 4755 3270 2427
09-19 63° 81° 8993 6831 4785 3292 2445
09-20 58° 84° 9042 6869 4814 3313 2460
09-21 64° 83° 9093 6911 4845 3336 2479
09-22 60° 82° 9142 6950 4874 3357 2495
09-23 66° 76° 9191 6989 4903 3378 2511
09-24 65° 76° 9240 7027 4932 3399 2526
09-25 65° 76° 9288 7066 4960 3419 2542
09-26 67° 74° 9337 7105 4989 3440 2558
09-27 67° 73° 9385 7143 5017 3460 2573
09-28 68° 77° 9435 7183 5047 3483 2590
09-29 65° 70° 9481 7219 5073 3500 2603
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 63° 66° 9523 7251 5095 3514 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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