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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MSU Proxy/Primo Seedhead Timer (GDD 32)
through Wed, Mar. 27. 2024

 

GDD Total: 455 (Base 32) through Wed, Mar. 27, 2024

  

Ankeny, IA

       

Forecast »

Done

651

Over

501

Target

220

Close

121

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 26° 44° 13 3 0 0 0
02-16 13° 28° 13 3 0 0 0
02-17 31° 13 3 0 0 0
02-18 24° 41° 24 4 0 0 0
02-19 22° 57° 41 11 0 0 0
02-20 29° 64° 66 26 4 0 0
02-21 38° 62° 94 44 13 0 0
02-22 40° 64° 124 64 22 2 0
02-23 30° 54° 144 74 23 2 0
02-24 22° 51° 159 79 23 2 0
02-25 32° 65° 185 95 30 2 0
02-26 34° 78° 219 119 44 8 1
2024Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
02-27 17° 60° 236 126 44 8 1
02-28 31° 236 126 44 8 1
02-29 20° 57° 253 133 44 8 1
03-01 31° 54° 273 143 44 8 1
03-02 32° 69° 302 162 53 8 1
03-03 48° 79° 343 193 74 22 10
03-04 39° 45° 364 204 75 22 10
03-05 29° 56° 384 214 75 22 10
03-06 30° 58° 406 226 77 22 10
03-07 36° 56° 430 240 81 22 10
03-08 32° 45° 447 247 81 22 10
03-09 23° 47° 460 250 81 22 10
2024Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
03-10 23° 57° 478 258 81 22 10
03-11 41° 76° 514 284 98 31 13
03-12 48° 68° 550 310 114 39 16
03-13 41° 71° 584 334 128 45 18
03-14 47° 57° 614 354 138 47 18
03-15 36° 58° 639 369 142 47 18
03-16 39° 52° 662 382 146 47 18
03-17 27° 39° 673 383 146 47 18
03-18 21° 36° 680 383 146 47 18
03-19 30° 65° 705 399 151 47 18
03-20 30° 46° 721 405 151 47 18
03-21 29° 49° 738 412 151 47 18
2024Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
03-22 30° 43° 753 416 151 47 18
03-23 21° 36° 759 416 151 47 18
03-24 33° 47° 777 424 151 47 18
03-25 45° 63° 809 446 163 51 18
03-26 28° 51° 827 454 163 51 18
03-27 24° 42° 838 455 163 51 18
03-28 25° 55° 856 463 163 51 18
03-29 37° 64° 885 482 172 52 18
03-30 39° 56° 910 497 177 52 18
03-31 36° 54° 933 510 181 52 18
04-01 40° 50° 956 523 184 52 18
04-02 31° 51° 975 532 184 52 18
2024Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
04-03 32° 60° 999 546 188 52 18
2023Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
02-15 22° 43° 10 0 0 0 0
02-16 15° 25° 10 0 0 0 0
02-17 29° 10 0 0 0 0
02-18 23° 46° 23 3 0 0 0
02-19 31° 44° 39 9 0 0 0
02-20 24° 49° 54 14 0 0 0
02-21 18° 34° 58 14 0 0 0
02-22 30° 32° 67 14 0 0 0
02-23 32° 67 14 0 0 0
02-24 21° 67 14 0 0 0
02-25 11° 43° 72 14 0 0 0
02-26 23° 57° 90 22 0 0 0
2023Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
02-27 35° 47° 109 31 0 0 0
02-28 25° 43° 121 33 0 0 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 29° 52° 140 41 0 0 0
03-02 27° 39° 151 43 0 0 0
03-03 30° 51° 170 51 0 0 0
03-04 29° 49° 187 59 0 0 0
03-05 28° 52° 205 67 0 0 0
03-06 35° 42° 222 73 0 0 0
03-07 32° 47° 239 81 0 0 0
03-08 34° 41° 254 86 0 0 0
03-09 32° 37° 266 88 0 0 0
2023Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
03-10 29° 34° 276 88 0 0 0
03-11 29° 35° 286 88 0 0 0
03-12 24° 32° 292 88 0 0 0
03-13 23° 27° 295 88 0 0 0
03-14 18° 36° 300 88 0 0 0
03-15 31° 56° 322 100 2 0 0
03-16 27° 48° 338 105 2 0 0
03-17 17° 32° 340 105 2 0 0
03-18 27° 340 105 2 0 0
03-19 11° 45° 346 105 2 0 0
03-20 31° 60° 370 119 5 0 0
03-21 36° 54° 393 132 8 0 0
2023Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
03-22 37° 55° 417 146 12 0 0
03-23 31° 41° 431 150 12 0 0
03-24 26° 53° 448 157 12 0 0
03-25 33° 54° 469 169 14 0 0
03-26 32° 39° 483 173 14 0 0
03-27 24° 47° 497 176 14 0 0
03-28 27° 50° 513 182 14 0 0
03-29 25° 41° 524 184 14 0 0
03-30 30° 69° 552 201 21 0 0
03-31 38° 79° 588 228 38 9 4
04-01 33° 50° 608 237 38 9 4
04-02 34° 73° 640 259 50 12 4
2023Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
04-03 37° 53° 663 273 53 12 4
04-04 44° 67° 697 296 67 18 4
04-05 32° 59° 720 309 70 18 4
04-06 28° 54° 739 319 70 18 4
04-07 34° 66° 767 337 78 18 4
04-08 45° 69° 802 362 93 25 6
04-09 44° 71° 838 387 108 33 9
04-10 48° 72° 876 415 127 43 14
04-11 47° 79° 917 446 148 56 22
04-12 59° 84° 967 486 177 78 39
04-13 54° 83° 1013 523 204 96 52
04-14 52° 82° 1059 558 229 113 65
2023Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
04-15 39° 65° 1089 578 240 116 65
04-16 34° 39° 1104 583 240 116 65
04-17 34° 59° 1129 598 245 116 65
04-18 33° 65° 1156 615 252 116 65
04-19 53° 76° 1198 648 274 130 74
04-20 41° 63° 1228 668 284 132 74
04-21 36° 46° 1247 677 284 132 74
04-22 32° 40° 1261 681 284 132 74
04-23 29° 50° 1279 688 284 132 74
04-24 32° 62° 1304 703 289 132 74
04-25 40° 60° 1332 721 297 132 74
04-26 36° 62° 1359 739 305 132 74
2023Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
04-27 42° 71° 1394 763 319 139 76
04-28 47° 71° 1430 790 336 148 79
04-29 39° 58° 1457 806 342 148 79
04-30 39° 57° 1483 822 348 148 79
05-01 41° 62° 1512 842 358 149 79
05-02 40° 65° 1542 862 368 151 79
05-03 35° 70° 1573 883 379 154 79
05-04 43° 80° 1613 912 398 166 86
05-05 54° 71° 1653 943 419 178 94
05-06 57° 76° 1697 977 443 194 105
05-07 57° 78° 1743 1013 469 212 118
05-08 58° 76° 1789 1048 494 230 130
2023Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
05-09 54° 74° 1831 1080 516 244 139
05-10 56° 82° 1878 1117 543 263 153
05-11 62° 82° 1928 1157 573 285 170
05-12 65° 79° 1978 1197 603 306 187
05-13 67° 76° 2027 1237 633 328 203
05-14 54° 71° 2067 1267 653 340 211
05-15 53° 62° 2103 1292 668 348 213
05-16 57° 80° 2149 1329 695 366 227
05-17 54° 79° 2194 1363 719 383 238
05-18 55° 82° 2240 1400 746 401 252
05-19 51° 65° 2276 1426 762 409 255
05-20 43° 72° 2312 1451 777 417 257
2023Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
05-21 49° 76° 2352 1482 798 429 264
05-22 54° 75° 2394 1514 820 443 274
05-23 54° 82° 2440 1550 846 461 287
05-24 56° 85° 2489 1588 874 481 302
05-25 58° 79° 2535 1625 901 500 316
05-26 49° 78° 2577 1656 922 514 324
05-27 48° 81° 2619 1689 945 528 334
05-28 51° 83° 2664 1724 970 545 346
05-29 55° 86° 2713 1762 998 566 361
05-30 63° 88° 2766 1805 1031 591 381
05-31 63° 88° 2820 1849 1065 617 402
06-01 66° 79° 2870 1890 1096 639 420
2023Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
06-02 66° 85° 2924 1934 1130 665 440
06-03 66° 88° 2979 1979 1165 692 463
06-04 66° 89° 3035 2024 1200 719 485
06-05 64° 85° 3087 2066 1232 744 504
06-06 63° 90° 3141 2111 1267 770 525
06-07 66° 78° 3191 2151 1297 792 543
06-08 61° 75° 3238 2187 1323 811 556
06-09 55° 79° 3283 2222 1348 828 568
06-10 58° 81° 3331 2260 1376 847 583
06-11 60° 71° 3374 2293 1399 863 593
06-12 46° 77° 3413 2323 1419 874 600
06-13 59° 84° 3463 2363 1449 896 617
2023Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
06-14 60° 88° 3515 2405 1481 920 636
06-15 61° 89° 3569 2448 1514 945 656
06-16 59° 78° 3615 2484 1540 964 669
06-17 59° 85° 3665 2524 1570 986 686
06-18 63° 82° 3715 2565 1601 1008 703
06-19 63° 87° 3768 2607 1633 1033 723
06-20 65° 86° 3821 2651 1667 1058 744
06-21 64° 86° 3874 2694 1700 1083 764
06-22 65° 88° 3929 2739 1735 1110 785
06-23 65° 89° 3984 2784 1770 1137 808
06-24 67° 83° 4037 2826 1802 1162 827
06-25 64° 78° 4086 2865 1831 1183 843
2023Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
06-26 62° 77° 4134 2903 1859 1203 858
06-27 57° 83° 4182 2942 1888 1223 873
06-28 67° 85° 4236 2985 1921 1249 894
06-29 69° 88° 4292 3032 1958 1277 918
06-30 69° 84° 4347 3076 1992 1304 939
07-01 69° 74° 4397 3116 2022 1325 956
07-02 67° 86° 4451 3160 2056 1352 977
07-03 65° 89° 4506 3206 2092 1379 1000
07-04 69° 90° 4564 3253 2129 1409 1024
07-05 67° 79° 4615 3295 2161 1432 1043
07-06 56° 76° 4659 3328 2184 1448 1053
07-07 53° 69° 4698 3358 2204 1459 1060
2023Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
07-08 56° 78° 4743 3393 2229 1476 1072
07-09 53° 82° 4789 3428 2254 1494 1084
07-10 59° 88° 4841 3470 2286 1517 1103
07-11 67° 87° 4895 3515 2321 1544 1125
07-12 66° 78° 4945 3554 2350 1566 1141
07-13 62° 84° 4996 3596 2382 1589 1160
07-14 68° 85° 5051 3640 2416 1616 1181
07-15 65° 84° 5103 3683 2449 1640 1201
07-16 64° 81° 5154 3723 2479 1663 1218
07-17 63° 76° 5201 3761 2507 1682 1232
07-18 57° 79° 5247 3797 2533 1700 1246
07-19 61° 82° 5297 3836 2562 1722 1262
2023Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
07-20 68° 81° 5350 3879 2595 1747 1282
07-21 59° 80° 5398 3917 2623 1766 1297
07-22 61° 85° 5449 3958 2654 1790 1315
07-23 66° 86° 5503 4002 2688 1816 1336
07-24 64° 89° 5557 4047 2723 1842 1358
07-25 68° 88° 5613 4093 2759 1870 1381
07-26 73° 93° 5675 4144 2800 1904 1409
07-27 71° 90° 5733 4192 2838 1934 1434
07-28 74° 97° 5796 4246 2882 1969 1465
07-29 69° 86° 5852 4291 2917 1997 1487
07-30 64° 86° 5905 4334 2950 2022 1507
07-31 66° 84° 5958 4377 2983 2047 1527
2023Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
08-01 66° 87° 6012 4422 3018 2073 1549
08-02 69° 76° 6063 4463 3049 2096 1567
08-03 68° 82° 6116 4506 3082 2121 1587
08-04 65° 86° 6170 4549 3115 2147 1607
08-05 70° 86° 6226 4595 3151 2175 1630
08-06 65° 74° 6274 4633 3179 2195 1645
08-07 64° 80° 6324 4673 3209 2217 1662
08-08 63° 82° 6374 4714 3240 2239 1680
08-09 65° 80° 6425 4754 3270 2262 1697
08-10 63° 84° 6476 4796 3302 2285 1716
08-11 65° 89° 6531 4841 3337 2312 1738
08-12 66° 86° 6585 4885 3371 2338 1759
2023Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
08-13 66° 78° 6635 4925 3401 2360 1776
08-14 61° 73° 6680 4960 3426 2377 1788
08-15 57° 78° 6726 4995 3451 2395 1800
08-16 57° 84° 6774 5034 3480 2415 1816
08-17 63° 77° 6822 5072 3508 2435 1831
08-18 53° 80° 6867 5107 3533 2452 1842
08-19 64° 92° 6923 5153 3569 2480 1866
08-20 76° 92° 6986 5205 3611 2515 1895
08-21 73° 91° 7045 5255 3651 2546 1922
08-22 73° 96° 7108 5308 3694 2581 1952
08-23 76° 98° 7173 5363 3739 2618 1984
08-24 78° 96° 7239 5418 3784 2656 2016
2023Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
08-25 74° 89° 7298 5467 3823 2687 2042
08-26 67° 83° 7351 5511 3857 2712 2063
08-27 59° 78° 7398 5547 3883 2731 2076
08-28 55° 84° 7445 5585 3911 2750 2090
08-29 63° 85° 7497 5626 3942 2774 2109
08-30 58° 82° 7545 5665 3971 2794 2124
08-31 54° 82° 7591 5701 3997 2812 2137
09-01 55° 87° 7640 5740 4026 2833 2153
09-02 61° 95° 7696 5786 4062 2861 2176
09-03 63° 96° 7754 5833 4099 2891 2201
09-04 67° 96° 7813 5882 4138 2922 2227
09-05 74° 92° 7874 5933 4179 2955 2255
2023Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
09-06 61° 75° 7920 5969 4205 2973 2268
09-07 50° 79° 7962 6002 4228 2987 2278
09-08 57° 82° 8010 6039 4255 3007 2292
09-09 54° 83° 8056 6076 4282 3025 2306
09-10 62° 77° 8104 6114 4310 3045 2321
09-11 59° 75° 8149 6149 4335 3062 2332
09-12 49° 77° 8190 6179 4355 3075 2340
09-13 52° 79° 8234 6213 4379 3090 2351
09-14 52° 82° 8278 6248 4404 3107 2362
09-15 57° 80° 8324 6284 4430 3125 2376
09-16 56° 81° 8371 6320 4456 3144 2389
09-17 53° 74° 8412 6352 4478 3157 2397
2023Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
09-18 48° 80° 8454 6384 4500 3171 2407
09-19 59° 71° 8498 6417 4523 3187 2417
09-20 57° 80° 8544 6454 4550 3205 2431
09-21 55° 80° 8590 6489 4575 3223 2443
09-22 62° 71° 8634 6524 4600 3239 2455
09-23 62° 81° 8684 6563 4629 3261 2471
09-24 62° 79° 8733 6602 4658 3282 2487
09-25 57° 79° 8779 6638 4684 3300 2500
09-26 58° 74° 8823 6672 4708 3316 2511
09-27 56° 74° 8866 6705 4731 3331 2521
09-28 53° 76° 8908 6737 4753 3345 2530
09-29 60° 91° 8962 6781 4787 3371 2551
2023Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
09-30 67° 93° 9020 6829 4825 3401 2576

 

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!