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Crabgrass Germination Prediction (GDD 50)
through Tue, May. 26. 2026

 

GDD Total: 166 (Base 50) through Tue, May. 26, 2026

  

Hart, MI

        

Forecast »

“Flashback” to 2025

5/21

5/22

5/23

5/24

5/25

5/26

5/27

5/28

5/29

5/30

5/31

6/1

6/2

Done

1401

Late

601

Germination

200

Early

100

Under

0

 

Generously Supported By:



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 28° 42° 13 3 0 0 0
02-16 28° 43° 27 7 0 0 0
02-17 31° 49° 45 15 0 0 0
02-18 39° 50° 67 27 2 0 0
02-19 32° 50° 86 36 2 0 0
02-20 32° 44° 102 42 2 0 0
02-21 28° 31° 110 42 2 0 0
02-22 25° 29° 115 42 2 0 0
02-23 17° 25° 115 42 2 0 0
02-24 16° 32° 117 42 2 0 0
02-25 17° 32° 119 42 2 0 0
02-26 11° 34° 119 42 2 0 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 28° 46° 134 47 2 0 0
02-28 21° 42° 144 47 2 0 0
03-01 18° 27° 144 47 2 0 0
03-02 16° 37° 149 47 2 0 0
03-03 27° 43° 162 50 2 0 0
03-04 25° 50° 177 56 2 0 0
03-05 38° 44° 197 65 2 0 0
03-06 38° 54° 220 79 6 0 0
03-07 36° 54° 243 92 9 0 0
03-08 34° 49° 263 101 9 0 0
03-09 45° 55° 291 119 17 0 0
03-10 39° 50° 313 132 20 0 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 31° 39° 327 135 20 0 0
03-12 29° 36° 337 135 20 0 0
03-13 31° 38° 350 138 20 0 0
03-14 25° 35° 358 138 20 0 0
03-15 31° 38° 370 140 20 0 0
03-16 18° 31° 372 140 20 0 0
03-17 15° 19° 372 140 20 0 0
03-18 20° 32° 376 140 20 0 0
03-19 31° 43° 391 145 20 0 0
03-20 39° 50° 413 158 22 0 0
03-21 33° 54° 434 168 23 0 0
03-22 32° 51° 454 178 23 0 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 27° 35° 463 178 23 0 0
03-24 26° 40° 474 179 23 0 0
03-25 32° 55° 495 190 24 0 0
03-26 30° 51° 513 198 24 0 0
03-27 27° 34° 522 198 24 0 0
03-28 23° 38° 530 198 24 0 0
03-29 38° 52° 553 211 27 0 0
03-30 42° 62° 583 231 37 2 0
03-31 37° 56° 608 246 42 2 0
04-01 31° 45° 624 252 42 2 0
04-02 32° 55° 645 263 43 2 0
04-03 35° 54° 667 275 45 2 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 38° 47° 688 286 46 2 0
04-05 34° 43° 705 293 46 2 0
04-06 28° 41° 717 295 46 2 0
04-07 22° 34° 723 295 46 2 0
04-08 28° 57° 744 306 46 2 0
04-09 44° 58° 773 325 55 3 0
04-10 36° 44° 790 333 55 3 0
04-11 29° 48° 807 340 55 3 0
04-12 45° 59° 838 360 66 6 0
04-13 50° 63° 873 385 81 13 2
04-14 49° 66° 908 410 96 20 4
04-15 49° 58° 940 432 108 24 4
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 47° 56° 969 451 117 25 4
04-17 45° 70° 1005 477 133 33 7
04-18 39° 56° 1030 492 138 33 7
04-19 33° 41° 1045 498 138 33 7
04-20 28° 44° 1059 501 138 33 7
04-21 41° 60° 1087 520 147 33 7
04-22 45° 67° 1122 544 161 40 8
04-23 49° 71° 1160 572 179 50 13
04-24 46° 64° 1193 595 192 55 13
04-25 43° 55° 1220 612 199 55 13
04-26 41° 57° 1247 630 207 55 13
04-27 49° 66° 1283 655 222 62 16
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 45° 57° 1312 674 231 63 16
04-29 39° 46° 1332 685 232 63 16
04-30 36° 45° 1351 694 232 63 16
05-01 34° 43° 1368 700 232 63 16
05-02 30° 49° 1385 707 232 63 16
05-03 40° 53° 1409 722 236 63 16
05-04 44° 65° 1442 744 249 68 16
05-05 42° 51° 1466 759 253 68 16
05-06 33° 49° 1486 768 253 68 16
05-07 34° 47° 1504 777 253 68 16
05-08 32° 56° 1527 789 256 68 16
05-09 45° 57° 1556 808 265 69 16
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 34° 52° 1577 819 266 69 16
05-11 34° 49° 1597 829 266 69 16
05-12 36° 60° 1623 845 272 69 16
05-13 41° 49° 1646 858 275 69 16
05-14 38° 57° 1671 874 280 69 16
05-15 42° 61° 1701 893 290 71 16
05-16 52° 66° 1738 920 307 80 20
05-17 51° 75° 1779 951 328 93 28
05-18 62° 70° 1823 986 352 109 39
05-19 51° 67° 1861 1013 370 118 43
05-20 45° 54° 1888 1030 377 118 43
05-21 39° 60° 1916 1048 385 118 43
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 46° 67° 1950 1073 399 125 45
05-23 51° 66° 1987 1099 416 133 49
05-24 52° 58° 2020 1122 429 138 49
05-25 49° 73° 2059 1151 448 149 55
05-26 59° 73° 2103 1186 472 166 66
05-27 53° 75° 2145 1217 494 179 75
05-28 55° 76° 2189 1251 518 195 85
05-29 52° 74° 2230 1282 539 208 93
05-30 56° 79° 2275 1318 564 226 106
05-31 52° 74° 2316 1349 585 239 114
06-01 55° 77° 2360 1383 609 255 125
06-02 55° 77° 2404 1417 633 271 136
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 55° 79° 2449 1452 658 288 148
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 20° 27° 1 0 0 0 0
02-16 20° 27° 3 0 0 0 0
02-17 10° 18° 3 0 0 0 0
02-18 8° 16° 3 0 0 0 0
02-19 12° 18° 3 0 0 0 0
02-20 18° 27° 4 0 0 0 0
02-21 15° 30° 4 0 0 0 0
02-22 23° 29° 8 0 0 0 0
02-23 25° 34° 16 0 0 0 0
02-24 32° 42° 32 5 0 0 0
02-25 33° 42° 47 11 0 0 0
02-26 31° 41° 61 15 0 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 33° 38° 75 18 0 0 0
02-28 30° 44° 90 24 0 0 0
03-01 17° 28° 90 24 0 0 0
03-02 21° 27° 92 24 0 0 0
03-03 22° 40° 101 24 0 0 0
03-04 37° 45° 120 32 0 0 0
03-05 25° 46° 134 36 0 0 0
03-06 25° 34° 141 36 0 0 0
03-07 28° 37° 152 37 0 0 0
03-08 21° 38° 159 37 0 0 0
03-09 33° 47° 177 45 0 0 0
03-10 34° 54° 199 56 2 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 34° 52° 220 67 3 0 0
03-12 31° 49° 238 75 3 0 0
03-13 26° 54° 256 83 3 0 0
03-14 44° 72° 292 109 19 8 3
03-15 43° 66° 324 132 31 13 3
03-16 26° 42° 337 134 31 13 3
03-17 19° 46° 347 135 31 13 3
03-18 42° 57° 375 152 39 13 3
03-19 37° 55° 399 167 43 13 3
03-20 30° 36° 410 167 43 13 3
03-21 29° 48° 426 174 43 13 3
03-22 25° 44° 439 176 43 13 3
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 24° 46° 452 179 43 13 3
03-24 31° 36° 463 181 43 13 3
03-25 31° 36° 475 182 43 13 3
03-26 25° 40° 486 183 43 13 3
03-27 29° 47° 502 189 43 13 3
03-28 39° 61° 529 207 51 13 3
03-29 40° 50° 553 220 54 13 3
03-30 36° 50° 574 231 55 13 3
03-31 31° 35° 585 233 55 13 3
04-01 23° 42° 595 233 55 13 3
04-02 31° 53° 615 242 55 13 3
04-03 37° 53° 638 256 58 13 3
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 31° 48° 656 263 58 13 3
04-05 38° 45° 675 273 58 13 3
04-06 29° 41° 689 276 58 13 3
04-07 28° 40° 700 278 58 13 3
04-08 26° 34° 708 278 58 13 3
04-09 28° 44° 723 282 58 13 3
04-10 35° 43° 739 289 58 13 3
04-11 29° 48° 756 296 58 13 3
04-12 27° 50° 773 302 58 13 3
04-13 44° 59° 802 321 68 14 3
04-14 45° 54° 829 339 75 14 3
04-15 34° 45° 847 346 75 14 3
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 34° 43° 863 353 75 14 3
04-17 31° 61° 887 367 79 14 3
04-18 48° 62° 920 390 92 19 3
04-19 39° 52° 944 403 96 19 3
04-20 34° 56° 967 416 99 19 3
04-21 44° 52° 993 433 105 19 3
04-22 35° 54° 1016 445 108 19 3
04-23 42° 63° 1046 466 118 22 3
04-24 48° 69° 1083 493 135 30 7
04-25 43° 56° 1111 510 143 30 7
04-26 40° 51° 1134 523 146 30 7
04-27 33° 57° 1157 536 149 30 7
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 48° 72° 1195 565 167 41 12
04-29 43° 69° 1229 589 181 47 13
04-30 32° 56° 1251 601 183 47 13
05-01 40° 54° 1276 616 188 47 13
05-02 40° 47° 1298 628 190 47 13
05-03 38° 50° 1320 640 192 47 13
05-04 37° 65° 1349 659 201 47 13
05-05 47° 59° 1380 680 212 51 13
05-06 46° 64° 1413 703 225 55 13
05-07 43° 61° 1443 723 235 57 13
05-08 42° 56° 1470 740 242 57 13
05-09 34° 53° 1492 751 244 57 13
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 43° 57° 1520 770 252 58 13
05-11 38° 63° 1549 788 261 58 13
05-12 46° 75° 1587 817 279 69 19
05-13 59° 66° 1628 848 300 81 26
05-14 59° 67° 1669 879 321 94 34
05-15 57° 79° 1715 915 347 113 48
05-16 51° 77° 1757 947 369 127 57
05-17 48° 57° 1788 967 380 129 57
05-18 42° 52° 1812 982 384 129 57
05-19 39° 56° 1838 997 390 129 57
05-20 45° 51° 1863 1013 395 129 57
05-21 46° 48° 1889 1028 401 129 57
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 43° 51° 1914 1044 406 129 57
05-23 41° 51° 1938 1057 410 129 57
05-24 39° 55° 1963 1072 415 129 57
05-25 39° 59° 1990 1089 422 129 57
05-26 41° 63° 2019 1109 431 131 57
05-27 50° 72° 2058 1138 450 142 63
05-28 50° 69° 2096 1165 468 151 67
05-29 49° 60° 2128 1188 480 156 67
05-30 49° 62° 2162 1211 494 161 67
05-31 44° 56° 2190 1230 502 161 67
06-01 36° 59° 2215 1245 507 161 67
06-02 42° 66° 2248 1268 520 166 67
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 60° 76° 2294 1303 546 184 80
06-04 53° 64° 2330 1330 562 192 83
06-05 53° 71° 2370 1359 582 204 90
06-06 55° 73° 2412 1392 604 218 100
06-07 53° 72° 2453 1422 625 230 107
06-08 54° 68° 2492 1452 644 242 113
06-09 51° 62° 2526 1476 658 248 115
06-10 53° 61° 2562 1501 674 255 117
06-11 52° 72° 2602 1532 694 268 124
06-12 59° 73° 2646 1566 718 284 135
06-13 59° 73° 2690 1599 742 299 146
06-14 54° 72° 2730 1630 762 312 154
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 58° 72° 2773 1663 785 327 164
06-16 61° 75° 2819 1699 811 345 176
06-17 65° 76° 2868 1737 840 366 192
06-18 64° 71° 2913 1773 865 383 205
06-19 60° 70° 2956 1806 888 398 215
06-20 60° 74° 3001 1841 913 415 227
06-21 70° 79° 3054 1884 946 440 247
06-22 72° 81° 3108 1928 980 466 268
06-23 69° 80° 3161 1970 1013 491 287
06-24 65° 77° 3210 2010 1042 512 303
06-25 67° 76° 3260 2049 1072 533 320
06-26 67° 77° 3310 2089 1102 556 337
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 68° 77° 3360 2130 1132 578 355
06-28 63° 71° 3405 2165 1157 595 366
06-29 62° 81° 3454 2204 1186 616 383
06-30 69° 75° 3504 2244 1216 638 400
07-01 64° 74° 3551 2281 1243 657 414
07-02 65° 77° 3600 2320 1272 678 430
07-03 64° 78° 3650 2359 1302 699 446
07-04 65° 77° 3699 2398 1331 721 462
07-05 71° 83° 3754 2444 1366 748 484
07-06 65° 76° 3802 2482 1394 768 500
07-07 62° 71° 3847 2517 1419 785 511
07-08 56° 77° 3891 2551 1443 801 523
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 64° 75° 3939 2589 1471 821 537
07-10 57° 76° 3983 2623 1495 837 549
07-11 65° 74° 4031 2661 1523 857 563
07-12 69° 75° 4081 2700 1553 878 580
07-13 63° 73° 4127 2737 1579 897 593
07-14 62° 76° 4174 2774 1606 916 608
07-15 64° 80° 4224 2814 1636 938 625
07-16 70° 81° 4278 2857 1670 963 645
07-17 58° 71° 4320 2890 1692 978 655
07-18 53° 72° 4361 2920 1713 990 662
07-19 60° 77° 4407 2957 1739 1009 676
07-20 63° 75° 4454 2994 1766 1028 690
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 55° 74° 4497 3026 1789 1043 699
07-22 60° 76° 4543 3063 1815 1061 713
07-23 65° 83° 4595 3105 1847 1085 732
07-24 72° 78° 4648 3148 1880 1110 752
07-25 67° 82° 4701 3191 1913 1135 771
07-26 70° 74° 4751 3231 1943 1157 789
07-27 68° 83° 4805 3274 1977 1182 809
07-28 67° 83° 4858 3317 2010 1207 829
07-29 63° 81° 4908 3358 2040 1230 846
07-30 62° 74° 4954 3394 2066 1248 859
07-31 59° 75° 4999 3429 2091 1265 872
08-01 56° 73° 5041 3461 2113 1279 881
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 52° 74° 5082 3492 2134 1292 889
08-03 55° 76° 5126 3526 2158 1308 900
08-04 60° 78° 5173 3563 2185 1327 914
08-05 61° 80° 5222 3602 2214 1348 929
08-06 62° 79° 5270 3640 2242 1368 945
08-07 64° 82° 5322 3681 2274 1391 963
08-08 71° 84° 5377 3727 2309 1419 985
08-09 72° 84° 5433 3773 2345 1447 1009
08-10 70° 81° 5486 3816 2378 1472 1029
08-11 70° 77° 5538 3858 2410 1496 1048
08-12 69° 74° 5588 3897 2440 1517 1064
08-13 66° 78° 5637 3937 2469 1539 1081
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 59° 78° 5684 3974 2496 1558 1095
08-15 66° 80° 5735 4015 2527 1581 1113
08-16 71° 82° 5789 4059 2561 1607 1134
08-17 68° 78° 5840 4100 2592 1630 1152
08-18 62° 74° 5886 4136 2618 1648 1165
08-19 67° 72° 5934 4173 2646 1668 1179
08-20 63° 75° 5981 4210 2673 1687 1193
08-21 57° 76° 6025 4245 2697 1703 1205
08-22 60° 75° 6071 4280 2723 1720 1217
08-23 64° 72° 6117 4317 2749 1739 1231
08-24 59° 68° 6159 4349 2771 1753 1239
08-25 57° 65° 6198 4378 2790 1764 1245
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 52° 67° 6235 4405 2807 1773 1250
08-27 49° 71° 6273 4433 2825 1783 1254
08-28 55° 69° 6313 4463 2845 1795 1262
08-29 45° 64° 6346 4485 2858 1800 1262
08-30 45° 68° 6380 4510 2872 1806 1263
08-31 47° 71° 6417 4537 2889 1815 1267
09-01 52° 73° 6457 4567 2909 1827 1274
09-02 54° 73° 6499 4599 2931 1841 1283
09-03 57° 66° 6538 4628 2950 1852 1289
09-04 48° 61° 6571 4650 2963 1857 1289
09-05 54° 61° 6606 4676 2978 1864 1292
09-06 50° 58° 6639 4698 2991 1868 1292
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 48° 60° 6671 4720 3003 1872 1292
09-08 43° 65° 6703 4742 3015 1876 1292
09-09 51° 69° 6741 4770 3033 1886 1297
09-10 53° 71° 6780 4800 3052 1898 1304
09-11 53° 73° 6821 4831 3073 1911 1311
09-12 53° 73° 6862 4862 3094 1924 1320
09-13 59° 74° 6907 4897 3119 1941 1331
09-14 57° 79° 6953 4933 3145 1959 1344
09-15 57° 78° 6999 4969 3171 1977 1357
09-16 56° 76° 7043 5003 3195 1993 1368
09-17 56° 76° 7087 5036 3219 2008 1379
09-18 59° 76° 7132 5072 3244 2026 1391
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 62° 80° 7181 5111 3273 2047 1407
09-20 59° 77° 7228 5147 3300 2065 1421
09-21 61° 72° 7272 5182 3324 2082 1432
09-22 62° 72° 7317 5217 3349 2099 1444
09-23 60° 71° 7361 5250 3373 2115 1455
09-24 57° 69° 7402 5281 3394 2128 1463
09-25 58° 68° 7443 5312 3415 2140 1471
09-26 56° 70° 7484 5344 3436 2154 1479
09-27 53° 74° 7526 5375 3458 2168 1488
09-28 52° 72° 7566 5406 3478 2180 1495
09-29 49° 76° 7607 5436 3499 2192 1503
09-30 53° 78° 7650 5470 3522 2208 1513
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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