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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Relative Flowering Times for Broadleaf Weeds (GDD 50)
through Sat, Dec. 6. 2025

 
  

Coralville, IA

        

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 22° 28° 3 0 0 0 0
02-16 2° 23° 3 0 0 0 0
02-17 -6° 4° 3 0 0 0 0
02-18 -15° 5° 3 0 0 0 0
02-19 -2° 8° 3 0 0 0 0
02-20 -5° 16° 3 0 0 0 0
02-21 -7° 22° 3 0 0 0 0
02-22 6° 34° 3 0 0 0 0
02-23 22° 50° 17 4 0 0 0
02-24 38° 57° 43 19 6 0 0
02-25 34° 55° 65 32 8 0 0
02-26 36° 53° 88 44 10 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 32° 53° 108 55 11 0 0
02-28 33° 59° 132 69 15 0 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 21° 33° 137 69 15 0 0
03-02 14° 40° 143 69 15 0 0
03-03 30° 56° 164 80 17 0 0
03-04 45° 53° 191 98 24 0 0
03-05 28° 45° 205 102 24 0 0
03-06 22° 42° 215 102 24 0 0
03-07 31° 38° 228 105 24 0 0
03-08 26° 50° 244 110 24 0 0
03-09 29° 63° 267 124 27 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 33° 74° 299 146 39 4 0
03-11 41° 59° 327 164 47 4 0
03-12 28° 65° 352 178 52 4 0
03-13 35° 72° 384 200 64 8 0
03-14 54° 81° 429 236 89 25 13
03-15 32° 54° 450 247 90 25 13
03-16 28° 44° 464 251 90 25 13
03-17 24° 69° 489 266 95 25 13
03-18 38° 73° 523 289 109 31 13
03-19 35° 53° 545 301 111 31 13
03-20 29° 45° 560 306 111 31 13
03-21 31° 61° 584 320 115 31 13
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 26° 53° 601 328 115 31 13
03-23 37° 49° 622 339 115 31 13
03-24 30° 53° 641 348 115 31 13
03-25 41° 55° 667 364 121 31 13
03-26 31° 58° 690 377 124 31 13
03-27 41° 64° 721 397 135 34 13
03-28 49° 80° 763 430 157 48 23
03-29 59° 76° 808 465 182 65 35
03-30 39° 63° 838 484 192 67 35
03-31 33° 51° 858 495 192 67 35
04-01 32° 47° 876 502 192 67 35
04-02 44° 71° 911 527 207 74 37
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 39° 51° 934 540 210 74 37
04-04 35° 49° 953 550 210 74 37
04-05 36° 47° 973 560 210 74 37
04-06 29° 54° 992 569 210 74 37
04-07 34° 45° 1010 576 210 74 37
04-08 23° 49° 1024 580 210 74 37
04-09 38° 60° 1051 598 217 74 37
04-10 35° 60° 1077 613 223 74 37
04-11 39° 57° 1103 630 229 74 37
04-12 33° 65° 1130 647 236 74 37
04-13 51° 75° 1171 678 257 87 45
04-14 49° 62° 1204 701 270 92 46
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 43° 59° 1233 720 280 93 46
04-16 33° 66° 1261 738 287 93 46
04-17 54° 70° 1301 768 307 105 53
04-18 53° 72° 1342 798 328 118 60
04-19 45° 59° 1371 818 337 119 60
04-20 45° 54° 1398 835 345 119 60
04-21 45° 61° 1429 856 356 122 60
04-22 44° 71° 1465 882 371 130 63
04-23 57° 76° 1509 916 396 146 74
04-24 59° 77° 1555 952 422 164 87
04-25 52° 63° 1591 978 437 172 90
04-26 44° 64° 1623 1000 449 176 90
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 44° 68° 1657 1024 463 182 91
04-28 56° 79° 1703 1060 489 200 104
04-29 48° 74° 1742 1089 508 211 110
04-30 44° 65° 1774 1111 520 215 110
05-01 53° 64° 1811 1137 537 224 113
05-02 47° 58° 1841 1158 547 226 113
05-03 46° 58° 1872 1178 558 228 113
05-04 41° 70° 1905 1202 571 234 114
05-05 44° 69° 1940 1226 586 240 115
05-06 44° 76° 1978 1254 604 250 120
05-07 54° 81° 2023 1290 629 268 133
05-08 50° 72° 2062 1319 648 279 139
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 41° 72° 2097 1344 663 286 141
05-10 50° 84° 2142 1379 688 303 153
05-11 47° 80° 2184 1411 710 317 162
05-12 53° 83° 2230 1447 736 335 175
05-13 60° 82° 2279 1486 765 356 191
05-14 59° 85° 2330 1526 796 378 208
05-15 68° 89° 2386 1573 833 407 232
05-16 58° 82° 2434 1611 860 427 247
05-17 50° 66° 2470 1637 876 435 250
05-18 44° 74° 2507 1664 893 444 254
05-19 49° 63° 2541 1688 908 450 255
05-20 51° 68° 2579 1715 925 460 260
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 52° 57° 2611 1738 937 464 260
05-22 47° 63° 2645 1761 951 469 260
05-23 44° 70° 2680 1787 966 477 262
05-24 53° 70° 2719 1816 986 488 269
05-25 56° 64° 2758 1844 1004 498 274
05-26 47° 71° 2794 1871 1021 507 278
05-27 57° 73° 2838 1904 1044 522 288
05-28 57° 66° 2877 1934 1063 534 294
05-29 55° 71° 2918 1965 1085 547 303
05-30 54° 80° 2963 2000 1109 564 315
05-31 56° 84° 3011 2038 1138 584 330
06-01 54° 77° 3055 2072 1161 600 341
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 55° 88° 3104 2111 1191 621 357
06-03 63° 80° 3154 2150 1220 642 373
06-04 60° 74° 3198 2185 1244 659 385
06-05 56° 78° 3243 2220 1269 676 396
06-06 62° 79° 3292 2258 1298 696 412
06-07 59° 75° 3336 2293 1323 713 424
06-08 56° 78° 3382 2328 1348 731 436
06-09 54° 71° 3422 2359 1369 743 444
06-10 50° 81° 3466 2393 1393 759 455
06-11 63° 92° 3522 2438 1428 787 477
06-12 65° 86° 3575 2482 1461 812 498
06-13 63° 80° 3625 2521 1491 833 514
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 65° 83° 3677 2563 1523 857 533
06-15 69° 81° 3730 2606 1556 883 553
06-16 67° 86° 3784 2651 1590 909 574
06-17 66° 90° 3840 2696 1626 936 597
06-18 68° 74° 3889 2735 1655 957 613
06-19 61° 85° 3940 2776 1686 981 631
06-20 67° 87° 3995 2822 1721 1008 653
06-21 77° 93° 4058 2875 1764 1043 684
06-22 77° 92° 4121 2927 1807 1077 713
06-23 75° 93° 4182 2979 1848 1111 742
06-24 72° 83° 4238 3025 1884 1139 764
06-25 73° 89° 4297 3074 1923 1170 790
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 71° 90° 4356 3122 1962 1200 816
06-27 71° 81° 4409 3166 1996 1226 837
06-28 66° 90° 4466 3212 2032 1254 860
06-29 72° 86° 4522 3259 2069 1283 884
06-30 69° 85° 4577 3304 2103 1310 905
07-01 64° 85° 4630 3347 2136 1335 925
07-02 64° 87° 4683 3390 2170 1360 946
07-03 66° 89° 4739 3436 2205 1388 968
07-04 73° 90° 4799 3485 2245 1419 995
07-05 73° 88° 4857 3534 2283 1450 1020
07-06 71° 86° 4914 3580 2320 1479 1044
07-07 69° 85° 4969 3625 2355 1506 1066
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 72° 83° 5024 3671 2391 1533 1089
07-09 68° 87° 5080 3717 2426 1561 1111
07-10 70° 88° 5137 3764 2463 1590 1135
07-11 67° 84° 5191 3807 2497 1616 1156
07-12 68° 82° 5244 3851 2530 1641 1176
07-13 62° 82° 5294 3891 2560 1663 1193
07-14 64° 85° 5346 3933 2593 1687 1213
07-15 65° 88° 5401 3978 2627 1714 1234
07-16 72° 84° 5457 4024 2663 1742 1257
07-17 63° 72° 5503 4059 2689 1759 1270
07-18 61° 80° 5551 4098 2717 1780 1285
07-19 70° 87° 5607 4144 2754 1808 1309
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 72° 84° 5663 4190 2789 1836 1332
07-21 68° 79° 5715 4231 2821 1859 1350
07-22 73° 88° 5773 4280 2859 1890 1376
07-23 77° 91° 5836 4332 2902 1924 1405
07-24 71° 83° 5891 4377 2937 1952 1427
07-25 71° 83° 5946 4423 2972 1979 1449
07-26 72° 84° 6002 4469 3009 2007 1473
07-27 73° 89° 6061 4518 3048 2038 1499
07-28 69° 89° 6119 4565 3085 2067 1523
07-29 70° 90° 6177 4613 3123 2098 1548
07-30 67° 79° 6228 4655 3154 2121 1566
07-31 63° 76° 6276 4692 3182 2140 1581
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 56° 77° 6320 4727 3206 2157 1592
08-02 59° 76° 6365 4762 3232 2174 1605
08-03 57° 77° 6410 4797 3256 2191 1617
08-04 60° 79° 6458 4834 3284 2211 1631
08-05 63° 82° 6508 4875 3314 2233 1649
08-06 62° 82° 6558 4915 3344 2255 1665
08-07 69° 84° 6613 4959 3379 2281 1687
08-08 70° 89° 6671 5007 3417 2311 1712
08-09 75° 86° 6729 5056 3455 2342 1737
08-10 73° 85° 6786 5103 3492 2371 1761
08-11 67° 80° 6838 5144 3524 2394 1780
08-12 69° 82° 6891 5188 3557 2420 1800
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 64° 81° 6942 5228 3588 2442 1818
08-14 61° 80° 6990 5267 3617 2463 1834
08-15 67° 89° 7046 5313 3652 2491 1857
08-16 70° 92° 7105 5362 3691 2522 1882
08-17 74° 91° 7166 5412 3732 2554 1910
08-18 72° 89° 7225 5461 3771 2585 1936
08-19 71° 83° 7279 5506 3806 2612 1958
08-20 70° 85° 7335 5551 3841 2639 1980
08-21 62° 78° 7383 5589 3869 2659 1995
08-22 62° 80° 7432 5628 3898 2681 2011
08-23 62° 75° 7478 5665 3924 2699 2024
08-24 54° 73° 7520 5696 3946 2712 2033
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 50° 70° 7558 5724 3964 2723 2038
08-26 48° 73° 7597 5753 3983 2733 2044
08-27 51° 73° 7636 5783 4002 2745 2050
08-28 58° 82° 7684 5821 4030 2765 2065
08-29 60° 80° 7732 5859 4058 2785 2080
08-30 63° 78° 7781 5897 4087 2805 2096
08-31 60° 77° 7827 5934 4114 2824 2110
09-01 56° 77° 7872 5969 4138 2841 2121
09-02 56° 79° 7917 6004 4164 2858 2134
09-03 57° 70° 7959 6035 4185 2872 2142
09-04 45° 68° 7993 6060 4199 2878 2143
09-05 50° 65° 8028 6085 4215 2885 2146
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 43° 67° 8061 6108 4227 2890 2146
09-07 41° 70° 8094 6131 4241 2895 2146
09-08 47° 75° 8134 6160 4260 2906 2152
09-09 51° 77° 8176 6192 4282 2921 2161
09-10 54° 82° 8222 6229 4308 2939 2175
09-11 56° 85° 8270 6267 4337 2959 2190
09-12 58° 89° 8322 6309 4368 2983 2209
09-13 68° 96° 8382 6359 4408 3015 2236
09-14 66° 94° 8440 6407 4446 3045 2261
09-15 69° 89° 8497 6454 4483 3074 2285
09-16 64° 90° 8552 6499 4518 3101 2307
09-17 63° 88° 8605 6542 4552 3126 2327
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 67° 73° 8653 6580 4579 3146 2342
09-19 64° 80° 8703 6620 4609 3168 2359
09-20 60° 76° 8749 6656 4635 3186 2372
09-21 60° 78° 8796 6693 4662 3205 2386
09-22 62° 83° 8847 6734 4693 3228 2404
09-23 60° 75° 8892 6769 4718 3245 2416
09-24 59° 77° 8939 6805 4745 3263 2429
09-25 51° 79° 8982 6838 4768 3279 2439
09-26 52° 87° 9029 6876 4795 3298 2454
09-27 56° 87° 9079 6915 4825 3319 2470
09-28 60° 87° 9130 6957 4856 3343 2489
09-29 56° 88° 9180 6997 4886 3365 2506
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 58° 88° 9231 7038 4918 3388 2524
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 32° 44° 16 6 0 0 0
02-16 16° 32° 19 6 0 0 0
02-17 8° 31° 19 6 0 0 0
02-18 26° 47° 33 11 0 0 0
02-19 21° 55° 49 17 0 0 0
02-20 29° 57° 70 27 1 0 0
02-21 41° 59° 98 45 9 0 0
02-22 40° 64° 128 66 19 2 0
02-23 29° 55° 148 76 19 2 0
02-24 23° 43° 159 77 19 2 0
02-25 28° 66° 185 92 25 2 0
02-26 33° 75° 217 115 37 7 0
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 25° 74° 245 132 45 7 0
02-28 9° 30° 245 132 45 7 0
02-29 16° 52° 257 134 45 7 0
03-01 29° 50° 274 142 45 7 0
03-02 30° 64° 299 157 50 7 0
03-03 48° 79° 341 189 71 20 9
03-04 41° 61° 370 208 80 21 9
03-05 40° 54° 395 222 85 21 9
03-06 32° 54° 416 233 86 21 9
03-07 38° 49° 437 244 87 21 9
03-08 38° 45° 456 254 87 21 9
03-09 28° 43° 469 257 87 21 9
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-10 22° 50° 484 261 87 21 9
03-11 34° 73° 515 283 99 25 9
03-12 49° 70° 553 310 116 34 13
03-13 43° 70° 587 335 130 41 14
03-14 46° 58° 617 355 140 43 14
03-15 38° 59° 644 371 147 43 14
03-16 38° 56° 669 386 152 43 14
03-17 24° 41° 679 387 152 43 14
03-18 22° 37° 687 387 152 43 14
03-19 26° 63° 709 399 155 43 14
03-20 30° 49° 726 407 155 43 14
03-21 26° 48° 741 412 155 43 14
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-22 31° 43° 756 416 155 43 14
03-23 21° 40° 764 416 155 43 14
03-24 33° 53° 786 428 156 43 14
03-25 51° 60° 819 451 169 48 15
03-26 31° 52° 838 460 169 48 15
03-27 27° 43° 851 463 169 48 15
03-28 30° 53° 871 473 169 48 15
03-29 36° 63° 898 490 177 48 15
03-30 42° 63° 929 511 187 50 15
03-31 43° 57° 957 529 195 50 15
04-01 42° 48° 979 541 198 50 15
04-02 33° 42° 995 547 198 50 15
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-03 33° 40° 1009 551 198 50 15
04-04 34° 44° 1026 558 198 50 15
04-05 34° 50° 1046 568 198 50 15
04-06 30° 55° 1067 579 198 50 15
04-07 43° 61° 1097 599 209 53 15
04-08 46° 69° 1133 625 224 60 17
04-09 39° 65° 1163 645 234 62 17
04-10 41° 70° 1196 668 248 68 18
04-11 48° 63° 1230 692 261 73 18
04-12 44° 65° 1262 714 273 77 18
04-13 37° 79° 1298 740 289 85 21
04-14 59° 85° 1348 780 319 107 38
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-15 49° 73° 1387 809 338 118 44
04-16 56° 73° 1430 842 361 133 54
04-17 54° 64° 1467 869 378 142 58
04-18 47° 50° 1493 885 384 142 58
04-19 34° 56° 1516 898 387 142 58
04-20 31° 44° 1532 904 387 142 58
04-21 30° 50° 1550 912 387 142 58
04-22 37° 65° 1579 931 396 143 58
04-23 52° 70° 1618 960 415 154 64
04-24 41° 61° 1647 979 424 155 64
04-25 43° 63° 1678 1000 435 158 64
04-26 47° 63° 1711 1023 448 163 64
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-27 61° 79° 1759 1061 476 183 79
04-28 60° 69° 1801 1093 499 197 88
04-29 53° 65° 1838 1120 515 206 92
04-30 44° 77° 1877 1149 534 216 97
05-01 53° 71° 1917 1179 554 228 104
05-02 55° 66° 1955 1207 572 239 110
05-03 46° 72° 1992 1234 589 248 114
05-04 53° 69° 2031 1263 608 259 120
05-05 42° 70° 2065 1287 622 265 121
05-06 55° 76° 2108 1320 646 280 131
05-07 56° 74° 2152 1354 669 295 141
05-08 52° 80° 2196 1388 693 312 153
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-09 55° 67° 2235 1417 712 323 158
05-10 52° 72° 2275 1447 732 335 165
05-11 48° 76° 2315 1477 752 347 173
05-12 52° 85° 2361 1513 778 365 186
05-13 60° 74° 2406 1548 803 382 198
05-14 57° 64° 2445 1577 822 393 203
05-15 50° 73° 2484 1606 841 404 210
05-16 60° 77° 2531 1643 868 423 224
05-17 52° 80° 2575 1677 892 439 235
05-18 59° 87° 2626 1718 923 462 253
05-19 60° 83° 2676 1758 953 484 270
05-20 63° 81° 2726 1798 983 506 287
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-21 68° 83° 2779 1841 1016 531 307
05-22 56° 74° 2822 1874 1039 546 317
05-23 54° 80° 2867 1909 1064 563 329
05-24 61° 71° 2911 1943 1089 579 340
05-25 48° 73° 2950 1972 1107 590 346
05-26 60° 75° 2995 2007 1133 607 358
05-27 54° 73° 3037 2039 1154 621 367
05-28 55° 70° 3078 2070 1175 634 374
05-29 50° 73° 3117 2099 1194 645 381
05-30 53° 74° 3159 2131 1216 659 389
05-31 56° 79° 3204 2166 1241 676 402
06-01 61° 69° 3247 2199 1265 691 412
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-02 54° 75° 3290 2232 1288 706 422
06-03 65° 86° 3344 2276 1321 732 443
06-04 69° 79° 3396 2318 1354 756 462
06-05 60° 81° 3445 2357 1382 777 478
06-06 59° 80° 3493 2395 1410 797 493
06-07 57° 82° 3540 2432 1438 816 507
06-08 63° 74° 3587 2469 1464 835 521
06-09 54° 81° 3633 2505 1490 853 533
06-10 57° 75° 3677 2539 1514 869 545
06-11 51° 83° 3722 2574 1539 886 557
06-12 62° 91° 3777 2619 1574 913 578
06-13 73° 93° 3838 2670 1615 946 607
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-14 63° 86° 3890 2712 1648 970 626
06-15 64° 84° 3942 2754 1680 994 645
06-16 72° 87° 4000 2802 1717 1024 669
06-17 75° 92° 4061 2853 1758 1057 698
06-18 74° 90° 4121 2903 1799 1089 725
06-19 71° 81° 4176 2948 1833 1116 746
06-20 69° 85° 4231 2993 1868 1143 769
06-21 72° 89° 4289 3041 1907 1173 794
06-22 76° 90° 4350 3092 1948 1206 822
06-23 68° 84° 4404 3136 1982 1232 843
06-24 69° 88° 4461 3183 2018 1261 866
06-25 71° 91° 4520 3232 2057 1292 893
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-26 70° 87° 4577 3279 2094 1321 916
06-27 63° 78° 4625 3317 2123 1341 932
06-28 61° 75° 4671 3353 2149 1359 945
06-29 66° 84° 4724 3396 2181 1384 965
06-30 57° 75° 4768 3430 2205 1399 975
07-01 55° 72° 4809 3461 2226 1413 983
07-02 65° 79° 4859 3501 2256 1435 1001
07-03 69° 84° 4913 3545 2290 1461 1022
07-04 68° 79° 4965 3587 2322 1485 1041
07-05 63° 76° 5012 3624 2349 1504 1055
07-06 60° 81° 5061 3663 2378 1525 1070
07-07 65° 77° 5110 3702 2407 1546 1086
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-08 65° 81° 5160 3742 2438 1568 1104
07-09 66° 81° 5212 3784 2469 1592 1123
07-10 66° 83° 5264 3826 2502 1616 1142
07-11 63° 82° 5315 3867 2532 1639 1160
07-12 63° 84° 5366 3908 2563 1662 1178
07-13 71° 89° 5424 3956 2601 1692 1203
07-14 74° 91° 5485 4007 2642 1725 1230
07-15 69° 92° 5543 4055 2681 1755 1256
07-16 66° 82° 5596 4098 2713 1779 1275
07-17 63° 79° 5645 4137 2742 1801 1291
07-18 56° 76° 5689 4171 2766 1817 1303
07-19 55° 77° 5733 4205 2790 1833 1314
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-20 60° 77° 5780 4242 2817 1852 1328
07-21 61° 80° 5828 4280 2846 1872 1343
07-22 61° 82° 5878 4320 2875 1894 1360
07-23 63° 83° 5929 4361 2907 1917 1378
07-24 66° 79° 5980 4402 2937 1940 1396
07-25 64° 81° 6030 4442 2968 1962 1413
07-26 65° 83° 6082 4484 3000 1986 1432
07-27 65° 84° 6135 4527 3033 2011 1452
07-28 70° 86° 6192 4574 3069 2039 1475
07-29 69° 84° 6246 4618 3103 2066 1497
07-30 68° 81° 6299 4661 3136 2091 1517
07-31 69° 85° 6354 4706 3171 2118 1539
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-01 70° 84° 6409 4751 3206 2145 1561
08-02 69° 87° 6465 4797 3242 2173 1584
08-03 69° 87° 6521 4843 3278 2201 1606
08-04 68° 90° 6577 4889 3314 2229 1630
08-05 76° 90° 6638 4940 3355 2262 1658
08-06 64° 80° 6688 4980 3385 2284 1675
08-07 60° 79° 6736 5018 3413 2304 1689
08-08 60° 77° 6782 5054 3440 2322 1703
08-09 52° 72° 6822 5084 3459 2334 1710
08-10 51° 75° 6863 5115 3480 2347 1718
08-11 52° 79° 6907 5149 3504 2363 1729
08-12 63° 78° 6955 5187 3532 2383 1744
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-13 61° 79° 7003 5225 3560 2403 1759
08-14 60° 76° 7049 5261 3586 2421 1772
08-15 69° 81° 7102 5304 3619 2446 1792
08-16 64° 85° 7155 5347 3652 2470 1811
08-17 66° 80° 7206 5388 3683 2494 1829
08-18 64° 82° 7257 5429 3714 2517 1847
08-19 61° 78° 7304 5466 3741 2536 1862
08-20 59° 75° 7349 5501 3766 2553 1874
08-21 58° 75° 7393 5535 3791 2569 1885
08-22 52° 75° 7434 5566 3812 2582 1893
08-23 55° 80° 7480 5602 3837 2600 1906
08-24 62° 88° 7533 5645 3870 2625 1925
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-25 74° 91° 7593 5695 3910 2657 1953
08-26 74° 95° 7656 5748 3953 2691 1982
08-27 75° 96° 7719 5801 3996 2727 2013
08-28 70° 85° 7775 5847 4032 2755 2035
08-29 71° 89° 7833 5895 4070 2785 2061
08-30 65° 79° 7883 5935 4100 2807 2077
08-31 55° 82° 7930 5972 4127 2826 2091
09-01 61° 77° 7977 6009 4154 2844 2105
09-02 51° 76° 8018 6040 4175 2858 2114
09-03 51° 76° 8059 6071 4197 2871 2122
09-04 49° 78° 8101 6103 4218 2885 2131
09-05 54° 81° 8147 6139 4244 2903 2144
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-06 55° 72° 8188 6170 4266 2916 2152
09-07 47° 68° 8224 6196 4281 2924 2154
09-08 44° 73° 8260 6222 4297 2932 2158
09-09 48° 78° 8302 6254 4319 2946 2166
09-10 50° 82° 8346 6288 4343 2961 2177
09-11 53° 85° 8393 6325 4370 2981 2191
09-12 56° 86° 8442 6364 4399 3002 2207
09-13 62° 81° 8492 6404 4429 3024 2224
09-14 66° 84° 8545 6447 4462 3049 2245
09-15 65° 87° 8599 6491 4496 3075 2266
09-16 62° 85° 8651 6533 4528 3099 2285
09-17 59° 87° 8702 6574 4559 3122 2302
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-18 55° 86° 8750 6612 4588 3142 2318
09-19 62° 90° 8804 6656 4622 3168 2339
09-20 65° 92° 8861 6703 4658 3196 2362
09-21 61° 87° 8913 6745 4690 3221 2382
09-22 59° 75° 8958 6780 4715 3237 2393
09-23 50° 72° 8997 6809 4734 3248 2399
09-24 53° 74° 9038 6840 4755 3262 2408
09-25 49° 77° 9079 6871 4776 3275 2416
09-26 52° 80° 9123 6905 4800 3291 2426
09-27 57° 78° 9169 6941 4826 3308 2439
09-28 60° 84° 9219 6981 4856 3331 2456
09-29 58° 84° 9267 7019 4885 3351 2472
2024Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-30 58° 83° 9316 7058 4913 3372 2487

 

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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