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MSU Proxy/Primo Seedhead Timer (GDD 32)
through Wed, Jun. 24. 2026

 
  

Kalamazoo, MI

        

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Tabular Data

Daily GDD accumulation for various base temperature models in 2025 & 2026

2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 29° 50° 17 7 0 0 0
02-16 28° 55° 37 17 0 0 0
02-17 40° 54° 62 32 5 0 0
02-18 39° 63° 91 51 14 1 0
02-19 36° 56° 115 65 18 1 0
02-20 30° 47° 131 71 18 1 0
02-21 27° 31° 138 71 18 1 0
02-22 23° 28° 142 71 18 1 0
02-23 19° 26° 142 71 18 1 0
02-24 16° 31° 144 71 18 1 0
02-25 18° 32° 147 71 18 1 0
02-26 14° 35° 149 71 18 1 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 26° 55° 168 80 18 1 0
02-28 25° 47° 182 84 18 1 0
03-01 16° 29° 183 84 18 1 0
03-02 17° 39° 189 84 18 1 0
03-03 25° 38° 198 84 18 1 0
03-04 25° 53° 216 91 18 1 0
03-05 40° 45° 236 102 19 1 0
03-06 43° 66° 268 124 31 5 0
03-07 41° 64° 299 145 41 8 0
03-08 34° 57° 323 158 45 8 0
03-09 45° 71° 359 184 61 16 3
03-10 57° 64° 397 213 80 27 9
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 33° 57° 420 226 83 27 9
03-12 27° 41° 432 228 83 27 9
03-13 33° 44° 448 234 83 27 9
03-14 25° 38° 458 234 83 27 9
03-15 34° 63° 484 251 89 27 9
03-16 21° 51° 498 255 89 27 9
03-17 15° 21° 498 255 89 27 9
03-18 19° 35° 503 255 89 27 9
03-19 32° 53° 523 265 89 27 9
03-20 44° 63° 555 286 101 30 9
03-21 36° 60° 581 303 107 30 9
03-22 39° 60° 609 320 115 30 9
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 28° 37° 619 320 115 30 9
03-24 22° 45° 630 322 115 30 9
03-25 37° 64° 659 341 123 31 9
03-26 44° 71° 695 366 139 38 11
03-27 29° 40° 707 368 139 38 11
03-28 24° 43° 718 370 139 38 11
03-29 33° 60° 743 384 143 38 11
03-30 48° 75° 783 414 163 50 18
03-31 44° 70° 818 439 178 57 20
04-01 36° 44° 836 447 178 57 20
04-02 35° 66° 864 466 186 57 20
04-03 48° 64° 898 490 200 63 21
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 41° 61° 927 508 209 64 21
04-05 35° 43° 944 516 209 64 21
04-06 32° 46° 961 522 209 64 21
04-07 21° 40° 969 522 209 64 21
04-08 29° 61° 992 536 213 64 21
04-09 55° 67° 1031 565 232 75 27
04-10 38° 55° 1056 579 236 75 27
04-11 31° 58° 1078 592 239 75 27
04-12 45° 80° 1119 622 259 87 34
04-13 60° 77° 1166 659 286 106 48
04-14 62° 80° 1215 698 315 127 64
04-15 58° 71° 1257 730 337 142 73
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 54° 69° 1297 760 357 153 80
04-17 50° 77° 1339 792 379 167 89
04-18 41° 71° 1373 816 393 173 90
04-19 33° 47° 1391 824 393 173 90
04-20 28° 50° 1408 831 393 173 90
04-21 41° 72° 1442 856 407 180 92
04-22 47° 69° 1479 882 424 188 95
04-23 52° 80° 1522 916 447 204 106
04-24 58° 76° 1567 951 472 221 118
04-25 47° 67° 1603 976 487 228 120
04-26 45° 68° 1637 1000 502 234 121
04-27 48° 68° 1673 1026 517 242 124
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 50° 61° 1706 1049 531 247 124
04-29 43° 53° 1732 1066 537 247 124
04-30 35° 52° 1754 1077 539 247 124
05-01 35° 47° 1773 1087 539 247 124
05-02 30° 49° 1791 1095 539 247 124
05-03 38° 60° 1818 1112 546 247 124
05-04 46° 77° 1858 1141 566 259 131
05-05 44° 58° 1887 1161 575 260 131
05-06 38° 54° 1911 1175 579 260 131
05-07 36° 56° 1935 1189 583 260 131
05-08 35° 64° 1963 1206 591 260 131
05-09 49° 69° 2000 1233 608 269 135
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 38° 59° 2027 1250 614 269 135
05-11 41° 61° 2056 1269 623 270 135
05-12 34° 63° 2082 1286 630 270 135
05-13 40° 61° 2111 1304 638 271 135
05-14 39° 65° 2141 1324 648 273 135
05-15 40° 67° 2172 1345 660 276 135
05-16 57° 81° 2219 1382 686 295 148
05-17 59° 84° 2268 1421 716 316 165
05-18 68° 83° 2321 1465 749 341 185
05-19 60° 81° 2370 1503 777 362 200
05-20 51° 63° 2405 1528 792 369 202
05-21 46° 65° 2438 1552 806 374 203
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 48° 72° 2476 1580 824 384 208
05-23 54° 60° 2511 1605 839 391 210
05-24 54° 67° 2550 1633 857 402 215
05-25 49° 80° 2592 1665 880 416 225
05-26 55° 81° 2638 1701 906 434 238
05-27 55° 83° 2685 1738 932 453 252
05-28 58° 75° 2730 1773 957 469 263
05-29 50° 80° 2773 1806 980 485 273
05-30 55° 74° 2815 1839 1003 499 283
05-31 46° 75° 2854 1867 1022 510 289
06-01 52° 77° 2896 1900 1044 524 298
06-02 51° 76° 2938 1932 1066 538 307
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 49° 81° 2981 1964 1089 553 317
06-04 54° 84° 3028 2001 1116 572 331
06-05 66° 78° 3078 2041 1145 594 348
06-06 63° 81° 3128 2081 1176 616 365
06-07 59° 83° 3177 2120 1205 637 381
06-08 65° 85° 3230 2163 1237 662 400
06-09 71° 84° 3286 2209 1273 690 423
06-10 69° 90° 3343 2256 1310 719 448
06-11 67° 84° 3396 2300 1344 744 468
06-12 60° 77° 3442 2336 1370 762 481
06-13 60° 82° 3491 2375 1399 783 497
06-14 56° 73° 3534 2407 1421 798 507
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 46° 71° 3570 2434 1438 806 510
06-16 57° 73° 3613 2466 1461 821 520
06-17 55° 66° 3652 2495 1479 831 525
06-18 57° 67° 3692 2525 1499 843 532
06-19 54° 71° 3732 2555 1519 856 540
06-20 57° 70° 3773 2587 1541 869 548
06-21 52° 70° 3812 2616 1560 880 554
06-22 56° 75° 3856 2649 1583 896 565
06-23 53° 73° 3897 2680 1604 909 572
06-24 52° 67° 3934 2708 1622 918 577
06-25 58° 76° 3979 2743 1647 935 589
06-26 54° 75° 4022 2775 1669 950 598
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 57° 80° 4068 2811 1696 968 612
06-28 61° 84° 4119 2852 1726 991 629
06-29 68° 91° 4176 2899 1764 1020 654
06-30 73° 92° 4237 2950 1804 1052 681
07-01 72° 92° 4297 3000 1844 1084 708
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 20° 32° 4 0 0 0 0
02-16 19° 28° 6 0 0 0 0
02-17 8° 18° 6 0 0 0 0
02-18 2° 15° 6 0 0 0 0
02-19 11° 19° 6 0 0 0 0
02-20 12° 26° 6 0 0 0 0
02-21 20° 29° 8 0 0 0 0
02-22 12° 30° 8 0 0 0 0
02-23 24° 36° 16 0 0 0 0
02-24 35° 48° 36 10 0 0 0
02-25 30° 50° 54 18 0 0 0
02-26 26° 40° 65 19 0 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 33° 42° 81 24 0 0 0
02-28 26° 54° 99 33 0 0 0
03-01 19° 33° 103 33 0 0 0
03-02 19° 31° 106 33 0 0 0
03-03 22° 40° 115 33 0 0 0
03-04 37° 47° 134 42 0 0 0
03-05 29° 52° 153 51 0 0 0
03-06 25° 32° 159 51 0 0 0
03-07 27° 37° 169 51 0 0 0
03-08 22° 39° 178 51 0 0 0
03-09 31° 55° 199 62 1 0 0
03-10 37° 66° 229 82 11 2 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 39° 55° 254 96 16 2 0
03-12 31° 55° 274 107 16 2 0
03-13 30° 64° 299 122 21 2 0
03-14 43° 76° 337 149 39 11 4
03-15 56° 72° 379 182 61 25 14
03-16 30° 56° 400 193 62 25 14
03-17 24° 49° 414 197 62 25 14
03-18 41° 71° 448 221 76 31 15
03-19 48° 70° 485 248 93 40 19
03-20 29° 47° 502 254 93 40 19
03-21 23° 53° 518 260 93 40 19
03-22 29° 48° 534 267 93 40 19
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 25° 44° 547 270 93 40 19
03-24 31° 40° 561 273 93 40 19
03-25 23° 42° 571 274 93 40 19
03-26 23° 48° 584 277 93 40 19
03-27 31° 55° 605 288 94 40 19
03-28 46° 74° 643 315 111 50 23
03-29 57° 68° 683 346 132 62 31
03-30 56° 73° 725 378 154 76 40
03-31 31° 50° 744 387 154 76 40
04-01 23° 44° 755 388 154 76 40
04-02 35° 62° 782 404 161 76 40
04-03 40° 64° 812 424 171 78 40
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 33° 52° 832 435 171 78 40
04-05 41° 48° 855 447 174 78 40
04-06 33° 45° 872 455 174 78 40
04-07 27° 42° 885 457 174 78 40
04-08 24° 35° 892 457 174 78 40
04-09 26° 45° 906 461 174 78 40
04-10 32° 41° 920 466 174 78 40
04-11 27° 50° 937 472 174 78 40
04-12 28° 56° 957 482 174 78 40
04-13 43° 60° 986 502 183 80 40
04-14 47° 64° 1020 525 196 85 40
04-15 37° 48° 1040 535 197 85 40
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 33° 49° 1059 544 197 85 40
04-17 32° 62° 1084 559 202 85 40
04-18 57° 77° 1129 594 227 102 52
04-19 44° 69° 1163 618 241 109 53
04-20 38° 61° 1191 636 249 109 53
04-21 47° 61° 1223 658 261 113 53
04-22 37° 64° 1251 676 269 113 53
04-23 51° 72° 1291 706 289 125 60
04-24 49° 81° 1333 738 311 139 69
04-25 47° 74° 1372 767 330 150 75
04-26 43° 59° 1401 786 339 151 75
04-27 35° 66° 1430 805 348 152 75
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 46° 78° 1470 835 368 164 82
04-29 49° 79° 1512 867 390 178 91
04-30 39° 63° 1541 887 399 179 91
05-01 47° 71° 1578 914 416 188 95
05-02 47° 59° 1609 934 427 191 95
05-03 44° 61° 1640 955 438 194 95
05-04 42° 53° 1665 971 443 194 95
05-05 47° 67° 1700 996 459 201 98
05-06 48° 63° 1734 1019 472 206 98
05-07 44° 76° 1772 1047 490 216 103
05-08 46° 63° 1804 1070 502 221 103
05-09 33° 66° 1832 1087 510 221 103
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 42° 72° 1867 1112 525 228 105
05-11 45° 74° 1905 1140 543 238 110
05-12 46° 82° 1947 1172 565 252 119
05-13 62° 70° 1991 1206 589 268 130
05-14 61° 75° 2037 1242 615 286 143
05-15 60° 84° 2087 1282 645 308 160
05-16 58° 83° 2136 1321 674 329 176
05-17 54° 65° 2173 1349 691 338 180
05-18 49° 63° 2207 1373 706 344 181
05-19 41° 60° 2236 1391 714 345 181
05-20 44° 52° 2262 1408 721 345 181
05-21 47° 53° 2291 1426 729 346 181
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 45° 57° 2320 1445 738 347 181
05-23 39° 55° 2345 1460 743 347 181
05-24 37° 62° 2372 1477 750 347 181
05-25 45° 66° 2406 1501 764 352 182
05-26 42° 70° 2439 1524 777 358 183
05-27 52° 73° 2480 1555 798 370 190
05-28 55° 63° 2516 1582 815 379 194
05-29 52° 66° 2553 1608 831 388 197
05-30 46° 71° 2590 1635 848 396 201
05-31 44° 63° 2621 1657 859 400 201
06-01 38° 66° 2651 1676 869 402 201
06-02 38° 79° 2688 1703 886 410 205
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 59° 86° 2738 1744 917 433 222
06-04 62° 77° 2786 1781 944 453 237
06-05 57° 70° 2827 1813 966 466 245
06-06 57° 74° 2871 1846 989 482 256
06-07 54° 77° 2915 1880 1013 497 267
06-08 59° 77° 2961 1916 1039 515 280
06-09 53° 74° 3003 1948 1061 529 289
06-10 50° 69° 3041 1976 1079 539 293
06-11 55° 85° 3089 2014 1107 559 308
06-12 65° 83° 3141 2056 1139 583 327
06-13 62° 68° 3183 2088 1161 598 337
06-14 58° 74° 3227 2123 1186 614 348
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 57° 81° 3274 2159 1212 633 362
06-16 61° 83° 3324 2199 1242 655 379
06-17 66° 87° 3379 2244 1277 681 400
06-18 66° 83° 3431 2286 1309 706 420
06-19 62° 77° 3479 2324 1337 725 434
06-20 61° 81° 3528 2363 1366 746 450
06-21 72° 92° 3588 2413 1406 778 477
06-22 78° 93° 3651 2466 1449 813 508
06-23 76° 94° 3714 2519 1492 848 538
06-24 75° 90° 3774 2569 1532 881 565
06-25 73° 84° 3831 2616 1569 909 589
06-26 72° 88° 3889 2664 1607 939 614
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 70° 88° 3946 2711 1644 968 637
06-28 66° 80° 3997 2752 1675 991 655
06-29 62° 87° 4049 2795 1708 1016 675
06-30 72° 81° 4104 2839 1742 1043 697
07-01 66° 79° 4155 2880 1773 1065 715
07-02 61° 84° 4206 2921 1804 1088 732
07-03 62° 86° 4258 2963 1836 1112 751
07-04 65° 83° 4310 3005 1868 1136 770
07-05 71° 90° 4368 3053 1906 1166 796
07-06 72° 87° 4425 3100 1943 1196 820
07-07 65° 80° 4475 3141 1974 1218 837
07-08 57° 83° 4524 3179 2002 1238 852
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 70° 82° 4577 3223 2036 1264 873
07-10 61° 82° 4627 3262 2065 1285 890
07-11 69° 85° 4682 3307 2100 1313 912
07-12 74° 84° 4739 3354 2137 1341 936
07-13 66° 82° 4791 3396 2169 1365 955
07-14 57° 83° 4839 3434 2197 1385 970
07-15 59° 87° 4890 3475 2228 1409 988
07-16 71° 85° 4946 3521 2264 1436 1011
07-17 61° 71° 4990 3556 2288 1453 1022
07-18 56° 75° 5034 3590 2312 1469 1033
07-19 64° 79° 5084 3629 2342 1490 1049
07-20 66° 78° 5134 3669 2372 1512 1066
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 57° 80° 5181 3706 2399 1531 1080
07-22 63° 82° 5231 3746 2429 1553 1098
07-23 61° 89° 5284 3789 2462 1578 1118
07-24 72° 94° 5345 3840 2503 1611 1146
07-25 71° 82° 5400 3885 2538 1638 1167
07-26 72° 79° 5453 3928 2571 1664 1188
07-27 73° 89° 5512 3977 2610 1694 1213
07-28 71° 86° 5568 4024 2647 1723 1237
07-29 66° 88° 5623 4069 2682 1750 1259
07-30 65° 83° 5676 4111 2714 1774 1278
07-31 59° 76° 5721 4146 2739 1792 1291
08-01 56° 75° 5765 4180 2763 1807 1302
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 52° 76° 5807 4212 2785 1821 1311
08-03 53° 78° 5851 4246 2809 1837 1321
08-04 54° 79° 5895 4280 2833 1854 1333
08-05 59° 82° 5944 4319 2862 1874 1349
08-06 61° 84° 5994 4359 2892 1897 1366
08-07 66° 87° 6049 4404 2927 1923 1387
08-08 68° 89° 6105 4450 2963 1951 1411
08-09 68° 91° 6162 4497 3000 1981 1435
08-10 68° 90° 6219 4545 3038 2010 1459
08-11 71° 88° 6277 4592 3075 2040 1484
08-12 69° 87° 6333 4638 3111 2067 1507
08-13 67° 84° 6386 4682 3144 2093 1527
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 60° 84° 6436 4721 3174 2115 1544
08-15 64° 87° 6489 4765 3208 2140 1564
08-16 70° 89° 6547 4812 3245 2170 1589
08-17 70° 85° 6603 4858 3281 2198 1612
08-18 61° 83° 6653 4898 3311 2220 1629
08-19 65° 76° 6702 4937 3340 2240 1644
08-20 63° 70° 6746 4971 3364 2256 1656
08-21 58° 73° 6789 5004 3387 2272 1666
08-22 53° 79° 6834 5039 3412 2288 1677
08-23 62° 81° 6883 5078 3441 2310 1694
08-24 55° 71° 6924 5109 3462 2323 1702
08-25 54° 67° 6963 5138 3481 2333 1707
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 48° 68° 6999 5164 3497 2341 1711
08-27 43° 74° 7035 5190 3513 2350 1714
08-28 54° 74° 7078 5223 3536 2364 1723
08-29 44° 66° 7110 5245 3548 2369 1723
08-30 42° 72° 7146 5271 3564 2376 1726
08-31 46° 75° 7184 5299 3582 2387 1731
09-01 47° 77° 7224 5329 3602 2399 1738
09-02 50° 79° 7267 5362 3625 2413 1748
09-03 53° 74° 7308 5394 3647 2427 1757
09-04 48° 64° 7342 5418 3660 2433 1757
09-05 48° 64° 7377 5442 3675 2439 1759
09-06 47° 62° 7409 5464 3687 2443 1759
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 44° 64° 7441 5486 3699 2447 1759
09-08 38° 68° 7472 5507 3710 2450 1759
09-09 44° 74° 7509 5534 3727 2459 1762
09-10 52° 77° 7551 5567 3749 2474 1772
09-11 48° 79° 7593 5598 3771 2487 1780
09-12 51° 81° 7636 5632 3794 2503 1791
09-13 55° 74° 7679 5664 3817 2517 1800
09-14 61° 83° 7729 5704 3847 2539 1818
09-15 54° 84° 7776 5741 3874 2558 1832
09-16 54° 80° 7821 5776 3899 2576 1844
09-17 51° 82° 7866 5811 3924 2592 1855
09-18 52° 85° 7912 5847 3950 2611 1869
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 59° 86° 7963 5888 3981 2633 1886
09-20 61° 84° 8013 5929 4011 2656 1904
09-21 61° 77° 8060 5965 4038 2675 1918
09-22 62° 76° 8108 6003 4066 2694 1932
09-23 60° 70° 8151 6036 4089 2709 1942
09-24 62° 70° 8195 6070 4113 2725 1953
09-25 57° 72° 8237 6102 4135 2740 1963
09-26 52° 77° 8279 6135 4157 2754 1972
09-27 55° 83° 8327 6172 4185 2773 1986
09-28 55° 80° 8372 6207 4210 2791 1999
09-29 54° 82° 8418 6244 4237 2809 2012
09-30 51° 81° 8462 6278 4261 2825 2023
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55

 

Latest Updates

February 16th, 2026Welcome to the 2026 GDD Tracking Season

Although Punxsutawney Phil saw his shadow predicting six more weeks of winter, GDDTracker will start 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. As spring turns to summer, 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 2026!


 

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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