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Crabgrass Germination Prediction (GDD 50)
forecast for Sat, Jun. 6. 2026

 

Forecasted GDD Total: 569 (Base 50) through Sat, Jun. 6, 2026

  

Grand Rapids, MI

        

Forecast »

“Flashback” to 2025

5/26

5/27

5/28

5/29

5/30

5/31

6/1

6/2

6/3

6/4

6/5

6/6

6/7

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 18° 44° 9 0 0 0 0
02-16 24° 49° 23 5 0 0 0
02-17 33° 52° 44 15 0 0 0
02-18 38° 60° 70 32 7 0 0
02-19 33° 60° 95 47 12 0 0
02-20 31° 46° 112 53 12 0 0
02-21 27° 31° 119 53 12 0 0
02-22 23° 29° 123 53 12 0 0
02-23 15° 26° 123 53 12 0 0
02-24 15° 32° 124 53 12 0 0
02-25 14° 32° 125 53 12 0 0
02-26 11° 32° 125 53 12 0 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 26° 52° 142 60 12 0 0
02-28 24° 44° 154 62 12 0 0
03-01 14° 28° 154 62 12 0 0
03-02 15° 40° 160 62 12 0 0
03-03 24° 40° 170 62 12 0 0
03-04 25° 53° 187 69 12 0 0
03-05 38° 45° 206 79 12 0 0
03-06 38° 60° 233 96 19 0 0
03-07 39° 63° 262 115 28 1 0
03-08 34° 54° 284 127 30 1 0
03-09 47° 69° 320 153 46 9 3
03-10 36° 60° 346 168 51 9 3
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 33° 37° 359 171 51 9 3
03-12 27° 40° 371 173 51 9 3
03-13 31° 41° 385 177 51 9 3
03-14 24° 38° 394 177 51 9 3
03-15 32° 54° 415 189 53 9 3
03-16 19° 39° 422 189 53 9 3
03-17 14° 21° 422 189 53 9 3
03-18 14° 33° 424 189 53 9 3
03-19 31° 51° 443 198 53 9 3
03-20 40° 60° 471 216 61 9 3
03-21 33° 60° 495 230 65 9 3
03-22 36° 62° 522 247 72 9 3
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 28° 37° 533 247 72 9 3
03-24 22° 44° 544 249 72 9 3
03-25 33° 65° 571 266 79 9 3
03-26 36° 64° 599 284 87 9 3
03-27 29° 37° 610 284 87 9 3
03-28 23° 39° 619 284 87 9 3
03-29 34° 60° 644 299 92 9 3
03-30 44° 73° 680 326 109 18 7
03-31 43° 72° 716 352 124 26 9
04-01 32° 44° 732 358 124 26 9
04-02 31° 64° 758 374 130 26 9
04-03 44° 63° 790 395 142 29 9
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 40° 53° 814 410 146 29 9
04-05 35° 43° 831 417 146 29 9
04-06 30° 46° 847 423 146 29 9
04-07 22° 40° 856 423 146 29 9
04-08 29° 62° 880 437 150 29 9
04-09 51° 65° 916 463 166 37 12
04-10 39° 51° 939 476 168 37 12
04-11 29° 57° 960 487 169 37 12
04-12 46° 79° 1000 517 190 49 19
04-13 59° 73° 1044 551 214 65 31
04-14 58° 78° 1090 587 240 83 44
04-15 60° 68° 1131 618 261 97 52
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 55° 65° 1169 646 279 107 57
04-17 50° 77° 1211 678 301 120 66
04-18 41° 69° 1244 701 314 125 66
04-19 34° 45° 1261 708 314 125 66
04-20 28° 47° 1277 714 314 125 66
04-21 40° 66° 1308 735 325 128 66
04-22 46° 75° 1347 764 344 139 71
04-23 50° 79° 1389 796 366 154 81
04-24 60° 74° 1434 831 391 171 93
04-25 48° 68° 1470 857 407 178 96
04-26 43° 69° 1504 881 421 184 97
04-27 48° 69° 1540 907 437 193 100
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 50° 62° 1575 932 452 199 101
04-29 43° 52° 1600 947 457 199 101
04-30 36° 51° 1622 959 458 199 101
05-01 36° 45° 1640 967 458 199 101
05-02 31° 50° 1658 975 458 199 101
05-03 39° 60° 1686 993 466 199 101
05-04 46° 75° 1724 1021 484 209 107
05-05 44° 61° 1755 1042 495 212 107
05-06 37° 55° 1778 1055 498 212 107
05-07 36° 53° 1801 1068 501 212 107
05-08 33° 63° 1828 1085 508 212 107
05-09 48° 65° 1862 1109 522 218 108
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 36° 59° 1887 1124 527 218 108
05-11 40° 59° 1915 1142 535 218 108
05-12 33° 62° 1941 1158 541 218 108
05-13 42° 58° 1969 1176 549 219 108
05-14 38° 66° 1999 1196 559 221 108
05-15 40° 72° 2033 1220 573 227 109
05-16 56° 78° 2078 1255 598 244 121
05-17 61° 85° 2129 1296 629 267 140
05-18 67° 82° 2182 1339 662 291 159
05-19 60° 78° 2228 1375 688 310 173
05-20 50° 65° 2264 1401 704 317 175
05-21 44° 63° 2295 1422 715 321 175
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 44° 71° 2331 1448 731 329 178
05-23 52° 61° 2365 1472 745 335 179
05-24 52° 64° 2401 1498 761 343 182
05-25 51° 80° 2445 1532 785 359 193
05-26 59° 82° 2493 1570 813 379 208
05-27 55° 85° 2542 1609 842 399 224
05-28 57° 76° 2586 1643 866 416 235
05-29 47° 77° 2627 1674 887 428 243
05-30 56° 73° 2669 1706 909 443 252
05-31 46° 76° 2708 1735 928 454 258
06-01 51° 79° 2751 1768 951 469 268
06-02 51° 80° 2795 1802 975 485 279
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 52° 82° 2840 1837 1000 502 291
06-04 56° 84° 2888 1875 1028 522 306
06-05 64° 84° 2940 1917 1060 545 325
06-06 64° 83° 2991 1958 1091 569 343
06-07 63° 84° 3042 1999 1122 592 361
06-08 64° 86° 3095 2042 1155 617 381
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 19° 28° 2 0 0 0 0
02-16 21° 28° 4 0 0 0 0
02-17 5° 20° 4 0 0 0 0
02-18 -1° 15° 4 0 0 0 0
02-19 7° 19° 4 0 0 0 0
02-20 12° 27° 4 0 0 0 0
02-21 16° 32° 5 0 0 0 0
02-22 18° 29° 7 0 0 0 0
02-23 19° 34° 11 0 0 0 0
02-24 31° 43° 26 5 0 0 0
02-25 31° 48° 44 13 0 0 0
02-26 28° 38° 56 14 0 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 33° 41° 70 19 0 0 0
02-28 27° 49° 86 25 0 0 0
03-01 19° 31° 89 25 0 0 0
03-02 18° 30° 91 25 0 0 0
03-03 20° 39° 98 25 0 0 0
03-04 35° 52° 120 36 2 0 0
03-05 29° 52° 138 45 2 0 0
03-06 26° 34° 146 45 2 0 0
03-07 30° 38° 158 46 2 0 0
03-08 20° 39° 165 46 2 0 0
03-09 32° 53° 186 57 2 0 0
03-10 35° 61° 212 73 8 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 37° 53° 235 86 11 0 0
03-12 30° 52° 254 95 11 0 0
03-13 27° 63° 277 108 14 0 0
03-14 43° 77° 315 136 32 10 5
03-15 50° 70° 353 164 50 20 10
03-16 28° 48° 369 170 50 20 10
03-17 20° 49° 382 173 50 20 10
03-18 42° 68° 415 196 63 25 10
03-19 48° 68° 451 222 80 34 14
03-20 29° 46° 467 228 80 34 14
03-21 26° 57° 486 237 80 34 14
03-22 28° 49° 503 244 80 34 14
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 25° 47° 517 248 80 34 14
03-24 32° 40° 530 251 80 34 14
03-25 26° 39° 541 252 80 34 14
03-26 25° 46° 555 256 80 34 14
03-27 30° 52° 573 264 80 34 14
03-28 43° 69° 607 288 94 40 15
03-29 45° 65° 641 312 107 45 15
03-30 43° 68° 675 336 121 51 16
03-31 31° 40° 688 339 121 51 16
04-01 23° 42° 699 340 121 51 16
04-02 35° 60° 724 355 126 51 16
04-03 39° 62° 753 374 135 52 16
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 31° 52° 772 383 135 52 16
04-05 40° 51° 796 397 139 52 16
04-06 31° 47° 813 404 139 52 16
04-07 27° 41° 824 405 139 52 16
04-08 23° 35° 832 405 139 52 16
04-09 26° 47° 846 410 139 52 16
04-10 33° 42° 862 416 139 52 16
04-11 30° 53° 881 425 139 52 16
04-12 29° 58° 903 437 140 52 16
04-13 45° 61° 934 458 151 55 16
04-14 48° 62° 967 481 165 60 16
04-15 36° 48° 987 491 165 60 16
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 34° 49° 1007 501 165 60 16
04-17 30° 65° 1033 517 170 60 16
04-18 57° 69° 1074 548 192 74 25
04-19 42° 68° 1107 571 205 79 25
04-20 36° 58° 1132 586 210 79 25
04-21 44° 59° 1162 606 220 81 25
04-22 36° 64° 1190 624 228 81 25
04-23 45° 70° 1225 649 243 88 27
04-24 48° 79° 1267 681 265 102 36
04-25 51° 75° 1308 712 285 115 44
04-26 43° 60° 1337 731 295 116 44
04-27 37° 68° 1368 752 305 119 44
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 48° 79° 1409 783 327 132 52
04-29 48° 77° 1450 813 347 145 60
04-30 38° 62° 1477 831 355 145 60
05-01 47° 70° 1514 858 372 153 63
05-02 42° 57° 1542 876 380 153 63
05-03 40° 59° 1570 894 388 153 63
05-04 41° 63° 1600 914 398 155 63
05-05 48° 67° 1635 939 413 163 66
05-06 49° 64° 1670 964 428 169 68
05-07 44° 76° 1708 992 446 179 73
05-08 46° 60° 1739 1013 457 182 73
05-09 33° 65° 1766 1030 464 182 73
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 43° 75° 1803 1057 481 191 77
05-11 42° 74° 1839 1083 497 200 80
05-12 46° 84° 1883 1117 521 215 91
05-13 64° 73° 1929 1153 547 234 104
05-14 63° 76° 1977 1191 575 253 119
05-15 61° 85° 2028 1232 606 276 137
05-16 56° 84° 2076 1270 634 296 152
05-17 53° 63° 2111 1295 649 304 154
05-18 50° 61° 2145 1319 663 309 155
05-19 42° 55° 2172 1336 670 309 155
05-20 43° 49° 2196 1350 674 309 155
05-21 47° 50° 2223 1367 680 309 155
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 46° 57° 2252 1386 690 311 155
05-23 39° 54° 2277 1400 694 311 155
05-24 38° 61° 2304 1418 702 311 155
05-25 40° 66° 2335 1439 713 314 155
05-26 42° 72° 2370 1464 728 321 157
05-27 53° 74° 2412 1495 749 334 165
05-28 56° 65° 2450 1524 768 345 171
05-29 51° 67° 2487 1551 785 354 175
05-30 47° 69° 2523 1577 801 362 178
05-31 44° 62° 2554 1598 812 365 178
06-01 37° 66° 2583 1617 821 366 178
06-02 39° 78° 2620 1644 837 374 181
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 60° 87° 2671 1685 869 398 199
06-04 61° 78° 2719 1723 897 418 214
06-05 57° 76° 2764 1757 921 434 226
06-06 54° 79° 2808 1792 946 451 238
06-07 52° 80° 2852 1826 970 467 249
06-08 60° 78° 2900 1863 997 486 263
06-09 56° 75° 2943 1897 1021 502 273
06-10 53° 66° 2981 1924 1038 511 278
06-11 51° 84° 3026 1960 1064 528 290
06-12 63° 78° 3074 1998 1092 549 306
06-13 59° 74° 3119 2033 1117 566 317
06-14 55° 80° 3165 2069 1143 583 330
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 57° 81° 3212 2106 1169 602 344
06-16 61° 85° 3262 2146 1200 625 362
06-17 66° 88° 3317 2191 1235 652 384
06-18 68° 82° 3370 2234 1268 677 404
06-19 63° 77° 3418 2272 1296 697 419
06-20 61° 81° 3467 2311 1325 718 435
06-21 74° 94° 3529 2363 1367 752 464
06-22 80° 94° 3594 2418 1412 789 495
06-23 78° 95° 3658 2472 1456 825 527
06-24 71° 92° 3718 2522 1496 857 554
06-25 72° 79° 3772 2566 1530 883 574
06-26 67° 91° 3829 2613 1567 912 599
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 71° 89° 3887 2661 1605 942 623
06-28 65° 81° 3938 2702 1636 965 642
06-29 61° 91° 3992 2746 1670 991 663
06-30 72° 84° 4048 2792 1706 1019 686
07-01 65° 82° 4100 2834 1738 1043 704
07-02 64° 87° 4153 2877 1771 1068 725
07-03 64° 87° 4207 2921 1805 1094 745
07-04 66° 88° 4262 2966 1840 1121 767
07-05 72° 92° 4321 3015 1879 1152 794
07-06 71° 83° 4377 3060 1914 1179 816
07-07 64° 81° 4427 3101 1945 1202 834
07-08 59° 84° 4477 3141 1975 1224 850
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 68° 83° 4530 3184 2008 1249 871
07-10 60° 84° 4580 3224 2038 1271 888
07-11 65° 81° 4631 3265 2069 1294 906
07-12 72° 82° 4686 3310 2104 1321 928
07-13 66° 83° 4739 3353 2137 1345 947
07-14 59° 85° 4789 3393 2167 1368 964
07-15 58° 90° 4841 3435 2199 1392 984
07-16 71° 86° 4897 3481 2235 1420 1007
07-17 60° 74° 4943 3516 2260 1437 1019
07-18 54° 80° 4988 3552 2286 1454 1031
07-19 64° 81° 5038 3592 2316 1477 1048
07-20 67° 80° 5089 3633 2347 1500 1066
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 56° 83° 5136 3670 2374 1519 1081
07-22 61° 85° 5187 3711 2405 1542 1099
07-23 62° 92° 5243 3756 2440 1569 1121
07-24 74° 92° 5304 3807 2481 1602 1149
07-25 72° 82° 5359 3853 2517 1629 1171
07-26 71° 83° 5414 3898 2551 1656 1193
07-27 71° 92° 5473 3947 2591 1688 1220
07-28 70° 88° 5531 3994 2628 1717 1244
07-29 66° 91° 5587 4041 2665 1746 1267
07-30 64° 83° 5638 4082 2696 1769 1286
07-31 59° 77° 5684 4118 2722 1787 1299
08-01 56° 78° 5730 4154 2747 1804 1311
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 51° 80° 5773 4187 2771 1820 1321
08-03 55° 82° 5819 4223 2797 1838 1335
08-04 57° 82° 5867 4261 2825 1857 1349
08-05 61° 84° 5917 4301 2855 1880 1366
08-06 61° 86° 5969 4343 2887 1903 1385
08-07 66° 89° 6024 4388 2922 1931 1407
08-08 71° 90° 6083 4437 2960 1961 1433
08-09 70° 92° 6142 4486 2999 1992 1459
08-10 69° 91° 6200 4534 3038 2022 1484
08-11 72° 84° 6255 4579 3073 2050 1507
08-12 69° 85° 6310 4624 3108 2077 1529
08-13 69° 83° 6364 4668 3142 2103 1550
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 61° 83° 6415 4708 3172 2125 1567
08-15 65° 88° 6469 4753 3207 2152 1588
08-16 70° 89° 6527 4801 3244 2181 1613
08-17 67° 85° 6581 4845 3278 2207 1634
08-18 60° 84° 6630 4884 3308 2229 1651
08-19 66° 76° 6679 4923 3337 2250 1666
08-20 63° 76° 6727 4961 3364 2269 1681
08-21 59° 79° 6774 4998 3392 2289 1695
08-22 57° 80° 6820 5034 3418 2307 1709
08-23 62° 79° 6869 5073 3447 2328 1724
08-24 55° 70° 6910 5104 3468 2340 1732
08-25 54° 68° 6949 5133 3487 2352 1738
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 46° 70° 6985 5159 3502 2359 1741
08-27 43° 74° 7021 5185 3519 2368 1745
08-28 56° 75° 7065 5219 3543 2384 1756
08-29 44° 67° 7099 5243 3557 2390 1756
08-30 42° 73° 7135 5269 3573 2398 1759
08-31 46° 77° 7174 5298 3592 2409 1766
09-01 50° 78° 7216 5330 3614 2423 1775
09-02 51° 79° 7259 5363 3637 2438 1785
09-03 55° 68° 7299 5393 3657 2450 1791
09-04 47° 62° 7331 5415 3669 2454 1791
09-05 52° 63° 7367 5440 3684 2461 1793
09-06 49° 60° 7400 5463 3697 2466 1793
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 42° 65° 7431 5485 3709 2470 1793
09-08 38° 68° 7462 5506 3720 2473 1793
09-09 43° 73° 7498 5532 3736 2481 1797
09-10 50° 78° 7541 5565 3758 2495 1806
09-11 53° 80° 7585 5599 3783 2512 1817
09-12 52° 81° 7629 5633 3807 2528 1828
09-13 56° 76° 7673 5667 3831 2544 1839
09-14 58° 84° 7722 5706 3860 2565 1855
09-15 56° 84° 7770 5744 3888 2585 1870
09-16 55° 81° 7816 5780 3914 2603 1883
09-17 51° 84° 7861 5815 3939 2620 1896
09-18 56° 85° 7910 5854 3968 2641 1912
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 61° 85° 7961 5895 3999 2664 1930
09-20 57° 81° 8008 5932 4026 2683 1944
09-21 60° 75° 8054 5968 4052 2701 1956
09-22 63° 78° 8102 6006 4080 2721 1972
09-23 62° 73° 8148 6042 4106 2739 1984
09-24 59° 71° 8191 6075 4129 2754 1994
09-25 57° 71° 8233 6107 4151 2768 2003
09-26 54° 77° 8277 6141 4175 2784 2014
09-27 54° 81° 8322 6176 4200 2801 2027
09-28 56° 78° 8368 6211 4225 2818 2039
09-29 49° 82° 8411 6245 4249 2834 2049
09-30 51° 81° 8455 6279 4273 2850 2060
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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