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, May. 5. 2024

 

GDD Total: 1177 (Base 32) through Sun, May. 5, 2024

  

IA

        

Forecast »

“Flashback” to 2023

4/29

4/30

5/1

5/2

5/3

5/4

5/5

5/6

5/7

5/8

5/9

5/10

5/11

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 25° 43° 12 2 0 0 0
02-16 10° 26° 12 2 0 0 0
02-17 6° 28° 12 2 0 0 0
02-18 24° 43° 24 4 0 0 0
02-19 21° 57° 40 10 0 0 0
02-20 29° 60° 63 23 2 0 0
02-21 34° 60° 88 38 8 0 0
02-22 35° 64° 115 55 15 0 0
02-23 26° 52° 133 63 15 0 0
02-24 20° 51° 146 66 15 0 0
02-25 31° 65° 172 82 21 0 0
02-26 33° 78° 205 105 34 6 1
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 14° 58° 219 109 34 6 1
02-28 5° 29° 219 109 34 6 1
02-29 18° 57° 235 115 34 6 1
03-01 28° 55° 254 124 34 6 1
03-02 31° 68° 282 142 42 6 1
03-03 44° 78° 322 172 62 17 7
03-04 36° 45° 340 180 62 17 7
03-05 25° 56° 358 188 62 17 7
03-06 29° 57° 379 199 63 17 7
03-07 34° 56° 403 213 66 17 7
03-08 31° 44° 418 218 66 17 7
03-09 22° 46° 430 220 66 17 7
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 18° 56° 446 226 66 17 7
03-11 40° 76° 482 252 82 25 10
03-12 45° 68° 516 276 96 32 12
03-13 38° 72° 549 299 109 37 12
03-14 46° 55° 578 318 118 37 12
03-15 34° 55° 601 331 121 37 12
03-16 38° 50° 623 343 123 37 12
03-17 25° 37° 631 343 123 37 12
03-18 21° 36° 638 343 123 37 12
03-19 27° 64° 661 356 126 37 12
03-20 27° 45° 675 360 126 37 12
03-21 28° 46° 691 366 126 37 12
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 26° 42° 703 368 126 37 12
03-23 15° 31° 704 368 126 37 12
03-24 30° 40° 717 371 126 37 12
03-25 39° 62° 745 389 135 38 12
03-26 28° 50° 762 396 135 38 12
03-27 23° 39° 771 396 135 38 12
03-28 30° 49° 789 404 135 38 12
03-29 36° 66° 817 422 144 39 12
03-30 37° 58° 843 438 150 39 12
03-31 38° 59° 870 455 156 39 12
04-01 41° 46° 892 467 158 39 12
04-02 34° 46° 910 475 158 39 12
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 34° 53° 931 486 159 39 12
04-04 31° 55° 952 497 160 39 12
04-05 29° 56° 972 507 160 39 12
04-06 33° 59° 996 521 164 39 12
04-07 44° 63° 1028 543 176 42 12
04-08 46° 65° 1061 566 189 48 12
04-09 36° 67° 1090 585 199 49 12
04-10 40° 71° 1124 609 212 54 13
04-11 46° 58° 1154 629 222 56 13
04-12 39° 65° 1184 649 232 59 13
04-13 37° 85° 1223 678 251 70 19
04-14 56° 84° 1271 716 279 90 34
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 45° 74° 1309 744 297 99 39
04-16 58° 66° 1349 774 317 111 46
04-17 51° 63° 1384 799 332 119 48
04-18 46° 51° 1411 816 339 119 48
04-19 32° 54° 1432 827 340 119 48
04-20 31° 46° 1449 834 340 119 48
04-21 30° 51° 1467 842 340 119 48
04-22 37° 70° 1499 864 352 122 48
04-23 49° 67° 1535 890 368 130 51
04-24 39° 64° 1565 910 378 132 51
04-25 44° 63° 1596 931 389 136 51
04-26 48° 60° 1628 953 401 139 51
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 57° 71° 1670 985 423 153 60
04-28 57° 68° 1711 1016 444 166 68
04-29 48° 60° 1743 1038 456 170 68
04-30 43° 70° 1778 1063 471 177 69
05-01 48° 65° 1812 1087 485 184 71
05-02 51° 61° 1846 1111 499 190 72
05-03 39° 72° 1880 1135 513 195 72
05-04 48° 57° 1911 1156 524 198 72
05-05 40° 67° 1942 1177 535 201 72
05-06 48° 75° 1981 1206 554 213 79
05-07 55° 72° 2023 1238 576 226 87
05-08 51° 72° 2062 1267 595 237 93
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 47° 63° 2095 1290 608 242 93
05-10 43° 67° 2128 1313 621 247 93
05-11 45° 70° 2164 1339 637 255 96
05-12 47° 76° 2203 1368 656 266 103
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 19° 42° 9 0 0 0 0
02-16 13° 24° 9 0 0 0 0
02-17 0° 28° 9 0 0 0 0
02-18 21° 42° 18 0 0 0 0
02-19 31° 42° 32 4 0 0 0
02-20 28° 47° 48 10 0 0 0
02-21 15° 33° 50 10 0 0 0
02-22 27° 30° 56 10 0 0 0
02-23 7° 30° 56 10 0 0 0
02-24 2° 21° 56 10 0 0 0
02-25 9° 40° 59 10 0 0 0
02-26 23° 53° 75 16 0 0 0
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 34° 45° 92 23 0 0 0
02-28 26° 41° 104 25 0 0 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 30° 49° 121 32 0 0 0
03-02 27° 36° 131 32 0 0 0
03-03 27° 48° 147 38 0 0 0
03-04 28° 47° 162 44 0 0 0
03-05 27° 46° 177 48 0 0 0
03-06 34° 40° 192 53 0 0 0
03-07 33° 44° 208 60 0 0 0
03-08 33° 37° 222 63 0 0 0
03-09 31° 36° 233 65 0 0 0
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 27° 33° 241 65 0 0 0
03-11 29° 33° 250 65 0 0 0
03-12 24° 32° 256 65 0 0 0
03-13 22° 27° 259 65 0 0 0
03-14 13° 34° 260 65 0 0 0
03-15 31° 53° 280 74 0 0 0
03-16 26° 46° 294 78 0 0 0
03-17 13° 27° 294 78 0 0 0
03-18 9° 27° 294 78 0 0 0
03-19 9° 42° 297 78 0 0 0
03-20 31° 54° 318 89 0 0 0
03-21 34° 55° 341 102 3 0 0
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 35° 52° 362 113 4 0 0
03-23 29° 37° 373 114 4 0 0
03-24 24° 52° 389 120 4 0 0
03-25 32° 52° 409 130 4 0 0
03-26 31° 39° 422 133 4 0 0
03-27 22° 45° 434 135 4 0 0
03-28 26° 46° 447 138 4 0 0
03-29 22° 38° 455 138 4 0 0
03-30 28° 68° 482 155 11 0 0
03-31 35° 80° 517 180 27 8 3
04-01 32° 50° 537 190 27 8 3
04-02 32° 71° 566 209 37 10 3
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 36° 53° 589 222 39 10 3
04-04 41° 59° 617 240 47 10 3
04-05 31° 58° 639 252 49 10 3
04-06 24° 54° 656 259 49 10 3
04-07 33° 67° 684 277 57 10 3
04-08 45° 69° 719 302 72 17 5
04-09 44° 71° 754 327 87 24 7
04-10 49° 73° 793 356 106 35 13
04-11 46° 80° 833 386 127 48 21
04-12 59° 86° 884 427 157 70 38
04-13 54° 84° 931 464 184 89 52
04-14 52° 82° 976 499 209 106 64
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 38° 65° 1005 518 219 108 64
04-16 34° 39° 1020 523 219 108 64
04-17 34° 59° 1044 537 223 108 64
04-18 31° 64° 1069 552 228 108 64
04-19 49° 71° 1107 580 246 117 68
04-20 40° 58° 1134 597 253 117 68
04-21 35° 44° 1151 604 253 117 68
04-22 32° 40° 1165 608 253 117 68
04-23 30° 47° 1182 615 253 117 68
04-24 31° 60° 1205 628 256 117 68
04-25 35° 58° 1230 643 261 117 68
04-26 34° 61° 1256 659 267 117 68
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 41° 71° 1290 683 281 124 70
04-28 45° 70° 1326 709 297 131 72
04-29 39° 55° 1351 724 302 131 72
04-30 39° 56° 1376 739 307 131 72
05-01 40° 61° 1404 757 315 132 72
05-02 40° 64° 1434 777 325 134 72
05-03 33° 71° 1464 797 335 136 72
05-04 43° 81° 1504 827 355 147 79
05-05 55° 73° 1546 859 377 161 88
05-06 57° 72° 1588 891 399 176 98
05-07 54° 73° 1630 923 421 190 106
05-08 58° 74° 1674 957 445 206 117
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 54° 72° 1715 988 466 218 125
05-10 55° 81° 1761 1024 492 236 138
05-11 60° 82° 1810 1063 521 257 154
05-12 64° 79° 1859 1102 550 279 171
05-13 66° 75° 1908 1141 579 300 186
05-14 53° 70° 1948 1171 599 311 193
05-15 52° 65° 1984 1197 615 320 197
05-16 54° 81° 2030 1233 641 337 209
05-17 54° 77° 2073 1266 664 353 220
05-18 54° 82° 2120 1303 691 371 233
05-19 48° 63° 2153 1326 704 376 233
05-20 42° 72° 2188 1351 719 383 235
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 49° 76° 2228 1381 739 396 243
05-22 53° 74° 2270 1413 761 409 251
05-23 53° 82° 2315 1448 786 427 263
05-24 55° 85° 2363 1486 814 447 278
05-25 57° 78° 2409 1522 840 464 291
05-26 47° 78° 2450 1553 861 477 299
05-27 48° 81° 2492 1585 883 491 308
05-28 51° 84° 2537 1620 908 508 320
05-29 54° 86° 2585 1658 936 528 335
05-30 63° 87° 2638 1701 969 553 355
05-31 64° 86° 2691 1744 1002 578 375
06-01 65° 79° 2741 1784 1032 600 392
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 66° 84° 2794 1827 1065 625 412
06-03 65° 85° 2847 1870 1098 650 432
06-04 64° 89° 2901 1914 1132 677 453
06-05 62° 86° 2953 1956 1164 701 472
06-06 63° 88° 3007 2000 1198 726 493
06-07 65° 78° 3056 2039 1227 748 510
06-08 60° 74° 3101 2074 1252 765 522
06-09 54° 77° 3145 2108 1276 780 532
06-10 57° 78° 3190 2143 1301 798 545
06-11 58° 71° 3233 2176 1324 812 554
06-12 44° 76° 3271 2204 1342 822 559
06-13 57° 84° 3319 2242 1370 842 574
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 59° 87° 3370 2283 1401 865 592
06-15 59° 88° 3422 2325 1433 889 611
06-16 56° 77° 3466 2359 1457 906 622
06-17 57° 84° 3515 2398 1486 926 638
06-18 63° 81° 3565 2438 1516 948 655
06-19 63° 85° 3617 2480 1548 972 674
06-20 64° 85° 3669 2522 1580 996 693
06-21 63° 86° 3721 2564 1612 1021 712
06-22 64° 88° 3775 2608 1646 1047 733
06-23 64° 89° 3829 2652 1680 1073 754
06-24 66° 81° 3881 2694 1712 1096 773
06-25 64° 76° 3929 2732 1740 1116 788
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 62° 76° 3975 2768 1766 1135 801
06-27 56° 82° 4023 2806 1794 1154 816
06-28 67° 82° 4075 2848 1826 1179 835
06-29 67° 87° 4130 2893 1861 1206 857
06-30 68° 83° 4184 2937 1895 1231 878
07-01 69° 76° 4234 2977 1925 1254 896
07-02 65° 85° 4287 3020 1958 1279 916
07-03 64° 88° 4341 3064 1992 1305 937
07-04 68° 88° 4397 3110 2028 1332 959
07-05 66° 78° 4447 3150 2058 1354 976
07-06 54° 74° 4489 3182 2080 1368 985
07-07 51° 68° 4526 3209 2097 1378 990
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 52° 77° 4569 3242 2120 1392 999
07-09 51° 80° 4613 3276 2144 1408 1010
07-10 58° 87° 4664 3317 2175 1431 1028
07-11 66° 83° 4716 3359 2207 1455 1047
07-12 64° 76° 4764 3397 2235 1475 1062
07-13 62° 84° 4815 3438 2266 1498 1080
07-14 66° 82° 4867 3480 2298 1522 1099
07-15 63° 83° 4918 3521 2329 1545 1117
07-16 61° 79° 4966 3559 2357 1565 1132
07-17 60° 74° 5011 3594 2382 1582 1144
07-18 56° 78° 5056 3629 2407 1599 1156
07-19 59° 81° 5104 3667 2435 1619 1171
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 66° 80° 5155 3708 2466 1642 1189
07-21 57° 80° 5201 3744 2492 1660 1202
07-22 60° 84° 5251 3784 2522 1682 1219
07-23 63° 85° 5302 3825 2553 1706 1237
07-24 62° 88° 5355 3868 2586 1730 1257
07-25 67° 88° 5411 3914 2622 1758 1280
07-26 72° 91° 5470 3963 2661 1789 1306
07-27 72° 87° 5528 4011 2699 1819 1331
07-28 73° 96° 5590 4063 2741 1853 1360
07-29 66° 85° 5644 4107 2775 1879 1381
07-30 61° 85° 5695 4148 2806 1902 1399
07-31 63° 84° 5746 4189 2837 1926 1418
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 65° 85° 5800 4233 2871 1951 1438
08-02 70° 78° 5852 4275 2903 1975 1457
08-03 70° 84° 5907 4320 2938 2002 1479
08-04 65° 85° 5960 4363 2971 2027 1499
08-05 69° 85° 6015 4408 3006 2054 1521
08-06 66° 73° 6062 4445 3033 2074 1535
08-07 63° 80° 6112 4485 3063 2095 1552
08-08 62° 82° 6161 4524 3092 2117 1568
08-09 63° 80° 6211 4564 3122 2138 1585
08-10 61° 84° 6261 4604 3152 2160 1602
08-11 64° 88° 6315 4648 3186 2186 1623
08-12 63° 85° 6367 4690 3218 2211 1642
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 65° 77° 6417 4730 3248 2232 1659
08-14 61° 73° 6461 4764 3272 2248 1670
08-15 55° 78° 6506 4799 3297 2265 1682
08-16 56° 84° 6553 4836 3324 2285 1697
08-17 60° 75° 6599 4872 3350 2302 1709
08-18 51° 80° 6643 4906 3374 2318 1720
08-19 63° 91° 6698 4951 3409 2345 1742
08-20 74° 91° 6758 5001 3449 2378 1769
08-21 71° 90° 6817 5050 3488 2408 1795
08-22 72° 96° 6879 5102 3530 2442 1824
08-23 77° 98° 6944 5157 3575 2480 1857
08-24 77° 95° 7008 5211 3619 2516 1887
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 73° 88° 7066 5259 3657 2546 1913
08-26 64° 82° 7117 5300 3688 2569 1930
08-27 58° 76° 7162 5335 3713 2585 1942
08-28 56° 83° 7210 5373 3741 2605 1957
08-29 61° 84° 7260 5413 3771 2628 1974
08-30 57° 81° 7307 5450 3798 2647 1989
08-31 53° 80° 7352 5485 3823 2663 2000
09-01 54° 87° 7401 5524 3852 2684 2016
09-02 60° 95° 7456 5569 3887 2711 2038
09-03 62° 96° 7513 5616 3924 2740 2062
09-04 66° 95° 7572 5665 3963 2771 2088
09-05 73° 91° 7632 5715 4003 2803 2115
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 56° 73° 7674 5747 4025 2818 2124
09-07 49° 78° 7716 5779 4047 2831 2133
09-08 54° 82° 7762 5815 4073 2849 2146
09-09 53° 82° 7807 5850 4098 2866 2158
09-10 61° 75° 7853 5886 4124 2884 2171
09-11 57° 76° 7897 5920 4148 2901 2183
09-12 47° 76° 7937 5950 4168 2912 2189
09-13 50° 78° 7979 5982 4190 2926 2198
09-14 49° 81° 8022 6015 4213 2941 2208
09-15 55° 74° 8064 6047 4235 2956 2217
09-16 51° 79° 8108 6081 4259 2971 2228
09-17 50° 75° 8148 6111 4279 2983 2235
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 44° 81° 8189 6142 4300 2996 2243
09-19 60° 68° 8231 6174 4322 3010 2252
09-20 57° 79° 8277 6210 4348 3028 2265
09-21 56° 80° 8323 6246 4374 3046 2278
09-22 62° 68° 8366 6279 4397 3061 2288
09-23 62° 79° 8414 6317 4425 3081 2303
09-24 64° 78° 8463 6356 4454 3102 2319
09-25 56° 77° 8508 6391 4479 3119 2331
09-26 57° 73° 8551 6424 4502 3134 2341
09-27 55° 76° 8594 6457 4525 3150 2351
09-28 54° 75° 8637 6490 4548 3164 2361
09-29 61° 91° 8691 6534 4582 3190 2382
2023Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 67° 93° 8749 6582 4620 3220 2407

 

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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