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 Tue, May. 7. 2024

 

GDD Total: 1410 (Base 32) through Tue, May. 7, 2024

  

NE

        

Forecast »

“Flashback” to 2023

5/1

5/2

5/3

5/4

5/5

5/6

5/7

5/8

5/9

5/10

5/11

5/12

5/13

Done

801

Late

500

Optimum

250

Early

171

Under

0

 

Generously Supported By:



Tabular Data

Daily GDD accumulation for various base temperature models in 2024 & 2023

2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 22° 41° 10 0 0 0 0
02-16 12° 33° 10 0 0 0 0
02-17 10° 39° 13 0 0 0 0
02-18 24° 50° 28 5 0 0 0
02-19 25° 58° 47 15 0 0 0
02-20 25° 69° 72 30 5 0 0
02-21 33° 70° 102 49 15 1 0
02-22 41° 63° 132 70 25 4 0
02-23 33° 61° 157 85 30 4 0
02-24 23° 66° 180 97 33 4 0
02-25 29° 67° 206 113 39 4 0
02-26 36° 80° 242 139 55 12 3
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 17° 52° 254 142 55 12 3
02-28 10° 38° 257 142 55 12 3
02-29 27° 60° 278 154 56 12 3
03-01 34° 55° 301 166 59 12 3
03-02 37° 70° 332 188 70 16 3
03-03 43° 70° 367 212 85 22 5
03-04 39° 53° 391 226 89 22 5
03-05 23° 57° 408 234 89 22 5
03-06 25° 56° 427 243 89 22 5
03-07 35° 55° 450 256 92 22 5
03-08 29° 45° 465 261 92 22 5
03-09 23° 53° 481 266 92 22 5
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 22° 68° 504 279 95 22 5
03-11 41° 75° 540 305 111 30 8
03-12 43° 69° 574 330 125 37 9
03-13 37° 72° 607 352 137 41 9
03-14 47° 59° 638 373 148 44 9
03-15 36° 55° 661 386 152 44 9
03-16 41° 58° 688 403 159 44 9
03-17 26° 39° 699 404 159 44 9
03-18 21° 42° 708 404 159 44 9
03-19 33° 66° 736 422 166 44 9
03-20 35° 47° 755 431 166 44 9
03-21 31° 59° 777 443 169 44 9
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 32° 47° 795 451 169 44 9
03-23 26° 36° 804 451 169 44 9
03-24 32° 50° 823 460 169 44 9
03-25 31° 48° 840 467 169 44 9
03-26 26° 33° 848 467 169 44 9
03-27 18° 46° 858 467 169 44 9
03-28 32° 69° 887 486 178 45 9
03-29 49° 69° 924 513 195 54 14
03-30 35° 59° 949 528 200 54 14
03-31 39° 58° 975 544 206 54 14
04-01 42° 50° 999 558 210 54 14
04-02 38° 57° 1024 574 216 54 14
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 36° 54° 1048 587 219 54 14
04-04 30° 61° 1071 600 222 54 14
04-05 29° 64° 1095 615 227 54 14
04-06 42° 68° 1129 638 240 59 14
04-07 42° 59° 1157 657 249 60 14
04-08 36° 66° 1186 676 258 61 14
04-09 33° 68° 1215 694 266 61 14
04-10 41° 72° 1249 719 280 68 15
04-11 42° 61° 1279 738 290 69 15
04-12 35° 68° 1309 758 300 71 15
04-13 49° 86° 1354 794 326 89 28
04-14 52° 87° 1402 831 353 108 43
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 56° 77° 1446 866 378 125 54
04-16 65° 71° 1492 902 403 143 67
04-17 51° 68° 1530 929 421 152 72
04-18 43° 57° 1558 948 429 153 72
04-19 36° 56° 1583 962 434 153 72
04-20 32° 51° 1602 972 434 153 72
04-21 29° 52° 1621 980 434 153 72
04-22 43° 77° 1659 1009 452 163 77
04-23 53° 68° 1698 1037 471 174 83
04-24 38° 70° 1730 1059 483 178 83
04-25 52° 60° 1764 1084 497 184 84
04-26 53° 72° 1804 1114 517 196 91
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 52° 67° 1842 1141 535 205 95
04-28 54° 66° 1879 1169 552 215 100
04-29 42° 72° 1915 1194 568 222 102
04-30 53° 82° 1960 1229 593 240 115
05-01 48° 67° 1995 1255 608 247 117
05-02 48° 65° 2030 1279 623 254 119
05-03 42° 73° 2065 1305 638 261 121
05-04 47° 66° 2100 1329 653 268 123
05-05 41° 65° 2131 1350 664 271 123
05-06 53° 70° 2170 1380 683 282 129
05-07 50° 75° 2211 1410 704 295 137
05-08 51° 73° 2251 1440 724 307 144
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 47° 67° 2286 1466 739 314 146
05-10 45° 73° 2323 1493 756 323 150
05-11 48° 76° 2363 1523 776 335 157
05-12 52° 83° 2409 1558 802 352 169
05-13 54° 81° 2454 1594 827 370 182
05-14 56° 82° 2501 1631 854 389 196
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 19° 37° 6 0 0 0 0
02-16 10° 26° 6 0 0 0 0
02-17 -1° 35° 6 0 0 0 0
02-18 23° 46° 18 2 0 0 0
02-19 28° 46° 33 7 0 0 0
02-20 28° 52° 51 15 0 0 0
02-21 25° 52° 68 22 0 0 0
02-22 21° 40° 76 22 0 0 0
02-23 3° 20° 76 22 0 0 0
02-24 2° 18° 76 22 0 0 0
02-25 9° 49° 83 22 0 0 0
02-26 26° 50° 99 28 0 0 0
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 35° 56° 122 41 3 0 0
02-28 26° 49° 137 46 3 0 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 27° 52° 155 54 3 0 0
03-02 24° 43° 166 55 3 0 0
03-03 23° 55° 183 62 3 0 0
03-04 32° 50° 202 71 3 0 0
03-05 32° 67° 230 89 11 0 0
03-06 33° 41° 245 94 11 0 0
03-07 33° 45° 262 101 11 0 0
03-08 33° 41° 277 106 11 0 0
03-09 31° 37° 289 108 11 0 0
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 27° 34° 298 108 11 0 0
03-11 29° 35° 308 108 11 0 0
03-12 25° 32° 315 108 11 0 0
03-13 20° 33° 319 108 11 0 0
03-14 18° 53° 332 111 11 0 0
03-15 37° 68° 363 132 22 3 0
03-16 26° 55° 382 141 22 3 0
03-17 23° 40° 391 141 22 3 0
03-18 14° 29° 391 141 22 3 0
03-19 11° 50° 399 141 22 3 0
03-20 33° 66° 426 158 29 3 0
03-21 38° 50° 448 170 31 3 0
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 37° 54° 472 184 34 3 0
03-23 31° 42° 487 188 34 3 0
03-24 24° 56° 505 197 34 3 0
03-25 34° 53° 527 208 36 3 0
03-26 29° 44° 541 213 36 3 0
03-27 17° 43° 549 213 36 3 0
03-28 25° 53° 566 220 36 3 0
03-29 27° 47° 581 225 36 3 0
03-30 33° 76° 613 247 49 7 0
03-31 35° 65° 641 265 57 8 0
04-01 31° 57° 663 277 58 8 0
04-02 43° 73° 699 303 75 16 3
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 42° 61° 729 323 84 18 3
04-04 37° 70° 760 344 96 21 3
04-05 25° 46° 774 348 96 21 3
04-06 19° 60° 792 355 96 21 3
04-07 33° 70° 821 375 105 22 3
04-08 43° 74° 857 401 121 31 7
04-09 46° 75° 896 430 140 41 12
04-10 49° 74° 936 459 160 53 19
04-11 48° 83° 979 493 183 68 29
04-12 58° 87° 1029 533 213 91 47
04-13 58° 87° 1080 574 244 113 64
04-14 54° 81° 1126 609 270 131 77
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 41° 52° 1150 624 275 131 77
04-16 36° 58° 1175 639 280 131 77
04-17 30° 67° 1202 656 286 131 77
04-18 45° 76° 1241 684 305 141 82
04-19 61° 81° 1289 723 333 162 98
04-20 45° 58° 1319 743 343 164 98
04-21 36° 47° 1338 752 343 164 98
04-22 33° 47° 1357 760 343 164 98
04-23 25° 56° 1375 769 343 164 98
04-24 39° 69° 1407 791 355 168 98
04-25 37° 63° 1436 810 364 168 98
04-26 41° 68° 1468 832 376 172 98
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 39° 68° 1500 853 387 176 98
04-28 47° 56° 1529 873 397 177 98
04-29 36° 72° 1560 894 408 181 98
04-30 42° 60° 1589 913 417 182 98
05-01 38° 64° 1618 932 426 182 98
05-02 37° 66° 1647 951 435 184 98
05-03 35° 74° 1680 974 448 189 98
05-04 48° 82° 1723 1007 471 204 108
05-05 55° 70° 1764 1038 492 216 116
05-06 60° 78° 1811 1075 519 235 130
05-07 56° 89° 1861 1115 549 258 147
05-08 55° 84° 1909 1153 577 277 162
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 61° 75° 1955 1188 602 295 175
05-10 61° 85° 2006 1229 633 318 192
05-11 64° 79° 2055 1269 663 340 209
05-12 66° 82° 2108 1311 695 364 229
05-13 59° 81° 2155 1349 723 384 243
05-14 59° 72° 2199 1383 747 399 254
05-15 52° 58° 2232 1406 760 405 254
05-16 55° 77° 2276 1440 784 421 265
05-17 49° 82° 2320 1474 808 436 276
05-18 57° 83° 2368 1511 835 456 291
05-19 54° 68° 2407 1540 855 467 297
05-20 39° 74° 2441 1565 869 474 298
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 49° 80° 2484 1598 892 488 308
05-22 54° 77° 2527 1631 915 504 318
05-23 58° 82° 2576 1669 943 524 333
05-24 55° 86° 2624 1708 972 544 349
05-25 61° 82° 2674 1747 1001 566 365
05-26 59° 83° 2723 1787 1031 587 382
05-27 54° 83° 2769 1823 1057 606 395
05-28 58° 83° 2818 1862 1086 626 411
05-29 65° 87° 2872 1906 1120 652 432
05-30 67° 90° 2928 1952 1156 681 455
05-31 63° 88° 2982 1996 1190 706 476
06-01 66° 81° 3033 2037 1221 730 494
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 67° 87° 3088 2082 1256 757 516
06-03 61° 89° 3141 2125 1289 782 536
06-04 63° 89° 3195 2169 1323 808 557
06-05 60° 88° 3247 2211 1355 832 576
06-06 59° 89° 3300 2253 1387 856 595
06-07 65° 93° 3357 2300 1424 885 619
06-08 70° 84° 3412 2345 1459 912 642
06-09 62° 84° 3463 2386 1490 935 659
06-10 65° 82° 3514 2428 1522 959 678
06-11 61° 70° 3558 2461 1546 974 689
06-12 48° 76° 3598 2491 1566 986 696
06-13 53° 81° 3643 2527 1591 1003 708
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 55° 85° 3691 2564 1619 1023 723
06-15 61° 89° 3744 2607 1651 1048 742
06-16 67° 88° 3799 2653 1687 1075 765
06-17 66° 80° 3850 2693 1718 1098 783
06-18 56° 87° 3899 2733 1747 1120 799
06-19 64° 93° 3956 2780 1784 1149 823
06-20 68° 89° 4013 2827 1821 1177 847
06-21 67° 87° 4068 2872 1856 1204 869
06-22 66° 88° 4123 2917 1891 1231 891
06-23 67° 88° 4179 2962 1926 1259 913
06-24 71° 92° 4239 3012 1966 1291 940
06-25 63° 83° 4290 3053 1997 1314 958
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 58° 85° 4339 3093 2027 1335 975
06-27 60° 85° 4390 3134 2058 1358 993
06-28 70° 96° 4451 3185 2099 1391 1021
06-29 69° 90° 4508 3232 2136 1420 1045
06-30 67° 83° 4561 3275 2169 1445 1065
07-01 65° 74° 4608 3312 2196 1465 1079
07-02 64° 85° 4661 3354 2228 1489 1098
07-03 66° 89° 4716 3400 2264 1516 1121
07-04 67° 91° 4773 3447 2301 1546 1145
07-05 65° 75° 4821 3485 2329 1565 1160
07-06 56° 73° 4863 3517 2351 1580 1169
07-07 58° 71° 4906 3550 2374 1594 1179
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 58° 73° 4949 3583 2397 1610 1189
07-09 60° 80° 4998 3621 2425 1630 1205
07-10 62° 88° 5050 3664 2458 1655 1224
07-11 66° 87° 5105 3709 2493 1681 1246
07-12 63° 82° 5155 3749 2523 1704 1263
07-13 65° 84° 5208 3792 2556 1728 1283
07-14 67° 81° 5260 3834 2588 1753 1302
07-15 64° 85° 5313 3876 2620 1777 1322
07-16 65° 82° 5365 3918 2652 1801 1340
07-17 66° 77° 5414 3957 2681 1822 1357
07-18 62° 79° 5462 3996 2710 1842 1372
07-19 65° 80° 5512 4036 2740 1865 1389
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 66° 80° 5563 4077 2771 1887 1407
07-21 62° 80° 5612 4116 2800 1908 1423
07-22 64° 87° 5665 4159 2833 1934 1443
07-23 65° 87° 5719 4203 2867 1960 1464
07-24 69° 91° 5777 4251 2905 1990 1489
07-25 74° 85° 5834 4298 2942 2019 1513
07-26 71° 95° 5895 4349 2983 2052 1541
07-27 79° 98° 5962 4406 3030 2090 1575
07-28 73° 99° 6026 4460 3074 2126 1606
07-29 68° 84° 6080 4504 3108 2153 1627
07-30 67° 85° 6134 4548 3142 2179 1648
07-31 68° 79° 6186 4590 3174 2202 1667
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 68° 80° 6238 4632 3206 2226 1686
08-02 72° 80° 6292 4675 3240 2252 1707
08-03 71° 81° 6346 4719 3273 2278 1728
08-04 69° 83° 6400 4763 3307 2304 1748
08-05 70° 87° 6456 4810 3344 2333 1772
08-06 66° 77° 6506 4849 3374 2354 1789
08-07 63° 80° 6555 4889 3403 2375 1805
08-08 63° 83° 6606 4930 3434 2398 1823
08-09 66° 79° 6657 4970 3464 2421 1840
08-10 60° 87° 6708 5012 3496 2445 1859
08-11 66° 88° 6764 5058 3532 2472 1882
08-12 64° 87° 6818 5101 3565 2498 1902
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 65° 75° 6866 5140 3594 2518 1918
08-14 58° 76° 6911 5174 3618 2535 1930
08-15 53° 80° 6955 5209 3643 2552 1941
08-16 60° 90° 7009 5252 3676 2577 1961
08-17 64° 79° 7058 5292 3706 2598 1978
08-18 56° 84° 7106 5330 3734 2619 1993
08-19 69° 99° 7169 5382 3777 2653 2023
08-20 76° 92° 7231 5434 3818 2687 2052
08-21 73° 100° 7295 5489 3863 2723 2083
08-22 78° 101° 7363 5546 3910 2763 2117
08-23 78° 101° 7430 5604 3958 2802 2152
08-24 75° 103° 7497 5661 4005 2842 2186
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 73° 95° 7560 5713 4047 2876 2216
08-26 63° 80° 7609 5753 4077 2898 2232
08-27 57° 80° 7656 5790 4104 2916 2246
08-28 62° 85° 7708 5831 4135 2940 2264
08-29 63° 85° 7760 5874 4168 2964 2284
08-30 61° 84° 7810 5914 4198 2986 2301
08-31 61° 83° 7860 5954 4228 3009 2318
09-01 61° 89° 7914 5998 4262 3034 2339
09-02 63° 96° 7972 6045 4299 3064 2363
09-03 68° 97° 8032 6096 4340 3096 2391
09-04 66° 94° 8090 6144 4378 3127 2416
09-05 66° 86° 8144 6188 4412 3153 2437
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 57° 79° 8190 6224 4438 3170 2450
09-07 50° 81° 8234 6257 4461 3186 2461
09-08 59° 84° 8283 6297 4491 3208 2477
09-09 55° 86° 8332 6335 4520 3228 2493
09-10 62° 80° 8381 6375 4549 3249 2509
09-11 57° 74° 8424 6408 4572 3265 2519
09-12 46° 78° 8464 6438 4592 3277 2526
09-13 49° 78° 8506 6470 4614 3291 2535
09-14 59° 80° 8553 6507 4641 3310 2549
09-15 55° 75° 8597 6540 4665 3325 2560
09-16 54° 78° 8641 6574 4689 3341 2571
09-17 47° 77° 8681 6604 4708 3353 2577
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 55° 92° 8732 6646 4740 3376 2596
09-19 69° 91° 8790 6693 4777 3406 2621
09-20 62° 85° 8842 6735 4809 3430 2640
09-21 62° 81° 8892 6775 4839 3452 2657
09-22 63° 70° 8936 6810 4864 3469 2668
09-23 64° 79° 8985 6849 4893 3490 2684
09-24 53° 82° 9031 6885 4919 3507 2697
09-25 54° 81° 9076 6920 4944 3525 2709
09-26 53° 77° 9119 6953 4967 3540 2719
09-27 49° 78° 9161 6985 4989 3553 2728
09-28 56° 90° 9211 7025 5019 3576 2745
09-29 68° 95° 9271 7075 5059 3607 2772
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 73° 94° 9332 7126 5100 3641 2800

 

Latest Updates

March 18th, 2024Timing crabgrass preemergence applications in spring

Don't miss this update from from Kevin Frank regarding timing of crabgrass preemergence herbicides.


 

February 12th, 2024Welcome to the 2024 GDD Tracking Season

2024 might be the year that if you blinked you missed winter. We've already experienced some very unseasonably warm weather in February with temperatures in the 60's. Temperatures are remaining relatively mild but I wouldn't be surprised if winter resurfaced yet as we move through the rest of February and March. GDDTracker starts counting on February 15. Spring is typically the time of year when GDDTracker receives the most attention for alerting turfgrass managers of optimal application timing windows for suppressing annual bluegrass seedheads and crabgrass preemergence applications. However, there are many models you may find helpful throughout the season including the early season DMI timer and 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 fantastic 2024!
 

 

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