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Crabgrass Germination Prediction (GDD 50)
through Thu, Jun. 4. 2026

 

GDD Total: 535 (Base 50) through Thu, Jun. 4, 2026

  

Auburn Hills, MI

        

Forecast »

“Flashback” to 2025

5/30

5/31

6/1

6/2

6/3

6/4

6/5

6/6

6/7

6/8

6/9

6/10

6/11

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 27° 47° 15 5 0 0 0
02-16 27° 55° 34 14 0 0 0
02-17 36° 49° 54 24 0 0 0
02-18 36° 45° 73 33 0 0 0
02-19 33° 39° 87 37 0 0 0
02-20 33° 42° 102 42 0 0 0
02-21 31° 34° 113 43 0 0 0
02-22 28° 32° 121 43 0 0 0
02-23 20° 28° 123 43 0 0 0
02-24 15° 33° 125 43 0 0 0
02-25 23° 35° 132 43 0 0 0
02-26 13° 35° 134 43 0 0 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 25° 57° 153 52 0 0 0
02-28 24° 51° 169 58 0 0 0
03-01 16° 27° 169 58 0 0 0
03-02 18° 33° 172 58 0 0 0
03-03 25° 37° 181 58 0 0 0
03-04 28° 44° 195 62 0 0 0
03-05 35° 42° 212 68 0 0 0
03-06 35° 49° 232 78 0 0 0
03-07 47° 66° 267 103 15 7 2
03-08 41° 60° 295 122 24 7 2
03-09 44° 72° 331 148 40 15 5
03-10 41° 67° 363 170 52 19 5
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 33° 58° 387 184 56 19 5
03-12 28° 42° 400 187 56 19 5
03-13 28° 48° 416 192 56 19 5
03-14 26° 40° 427 194 56 19 5
03-15 31° 69° 455 212 64 19 5
03-16 21° 67° 477 223 66 19 5
03-17 18° 24° 477 223 66 19 5
03-18 16° 32° 479 223 66 19 5
03-19 32° 53° 500 234 66 19 5
03-20 34° 68° 529 253 76 21 5
03-21 34° 43° 546 260 76 21 5
03-22 33° 51° 566 270 76 21 5
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 28° 35° 576 270 76 21 5
03-24 19° 45° 585 270 76 21 5
03-25 31° 59° 609 283 79 21 5
03-26 39° 66° 639 304 89 23 5
03-27 26° 36° 648 304 89 23 5
03-28 26° 43° 661 306 89 23 5
03-29 34° 54° 683 318 91 23 5
03-30 42° 73° 718 344 107 31 7
03-31 55° 76° 762 377 130 46 18
04-01 31° 47° 779 385 130 46 18
04-02 33° 53° 800 395 131 46 18
04-03 48° 68° 836 421 147 54 21
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 38° 62° 864 439 155 54 21
04-05 35° 47° 883 448 155 54 21
04-06 31° 48° 901 456 155 54 21
04-07 24° 37° 909 456 155 54 21
04-08 25° 54° 927 464 155 54 21
04-09 42° 69° 960 487 169 60 21
04-10 40° 56° 986 503 175 60 21
04-11 37° 53° 1010 516 178 60 21
04-12 40° 81° 1048 545 196 70 27
04-13 63° 80° 1097 584 226 92 43
04-14 65° 80° 1147 624 256 114 60
04-15 60° 71° 1191 658 280 130 71
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 57° 66° 1231 687 299 141 77
04-17 52° 70° 1270 716 318 152 83
04-18 44° 63° 1301 738 329 155 83
04-19 35° 49° 1321 748 329 155 83
04-20 30° 46° 1337 753 329 155 83
04-21 36° 71° 1368 775 341 159 83
04-22 47° 74° 1406 803 359 169 89
04-23 45° 77° 1445 832 378 180 95
04-24 51° 74° 1486 863 399 193 103
04-25 46° 54° 1514 881 407 193 103
04-26 40° 62° 1543 900 416 194 103
04-27 43° 69° 1577 924 430 200 104
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 54° 64° 1615 952 448 210 108
04-29 45° 54° 1642 969 455 210 108
04-30 41° 53° 1667 984 460 210 108
05-01 39° 49° 1689 996 462 210 108
05-02 35° 48° 1709 1005 462 210 108
05-03 33° 63° 1735 1022 468 210 108
05-04 46° 76° 1774 1051 488 221 114
05-05 51° 66° 1811 1077 504 229 118
05-06 44° 53° 1838 1094 511 229 118
05-07 39° 55° 1863 1109 516 229 118
05-08 39° 64° 1892 1129 525 231 118
05-09 45° 70° 1928 1154 541 239 120
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 40° 60° 1956 1172 549 239 120
05-11 39° 57° 1982 1188 555 239 120
05-12 33° 58° 2005 1202 559 239 120
05-13 44° 59° 2035 1221 568 240 120
05-14 45° 65° 2068 1244 581 245 120
05-15 40° 71° 2101 1268 595 250 121
05-16 53° 81° 2146 1302 619 267 133
05-17 61° 84° 2197 1343 650 290 151
05-18 67° 89° 2253 1390 686 318 174
05-19 64° 86° 2306 1433 719 343 194
05-20 46° 70° 2342 1459 735 351 197
05-21 39° 62° 2370 1477 744 352 197
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 43° 65° 2403 1499 756 356 197
05-23 52° 58° 2436 1522 769 361 197
05-24 53° 64° 2472 1549 786 369 200
05-25 56° 79° 2518 1585 811 387 213
05-26 52° 82° 2563 1620 837 404 225
05-27 59° 82° 2612 1658 865 425 241
05-28 54° 70° 2651 1688 885 437 248
05-29 45° 82° 2693 1720 906 450 256
05-30 51° 70° 2731 1748 925 461 262
05-31 45° 77° 2771 1777 944 472 268
06-01 50° 77° 2812 1809 966 485 276
06-02 49° 77° 2853 1840 986 498 284
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 49° 82° 2897 1873 1010 514 295
06-04 55° 86° 2945 1912 1039 535 311
06-05 61° 84° 2996 1952 1069 557 328
06-06 65° 84° 3048 1995 1102 582 348
06-07 61° 84° 3099 2036 1132 604 365
06-08 58° 85° 3149 2075 1162 626 382
06-09 64° 87° 3202 2119 1196 651 402
06-10 68° 90° 3259 2166 1233 680 426
06-11 70° 94° 3319 2216 1273 713 454
06-12 72° 94° 3380 2267 1314 746 482
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 21° 29° 6 0 0 0 0
02-17 9° 20° 6 0 0 0 0
02-18 4° 16° 6 0 0 0 0
02-19 3° 17° 6 0 0 0 0
02-20 13° 22° 6 0 0 0 0
02-21 20° 30° 10 0 0 0 0
02-22 19° 30° 12 0 0 0 0
02-23 25° 36° 21 0 0 0 0
02-24 32° 50° 40 9 0 0 0
02-25 39° 54° 65 24 5 0 0
02-26 29° 41° 78 27 5 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 34° 43° 94 33 5 0 0
02-28 30° 54° 114 44 5 0 0
03-01 21° 38° 122 44 5 0 0
03-02 18° 29° 123 44 5 0 0
03-03 22° 39° 132 44 5 0 0
03-04 34° 48° 151 53 5 0 0
03-05 38° 55° 176 67 10 0 0
03-06 27° 35° 184 67 10 0 0
03-07 28° 39° 196 69 10 0 0
03-08 21° 37° 203 69 10 0 0
03-09 32° 55° 225 81 11 0 0
03-10 35° 64° 253 99 19 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 31° 58° 275 111 22 0 0
03-12 29° 46° 291 117 22 0 0
03-13 28° 57° 311 127 22 0 0
03-14 34° 70° 341 147 32 2 0
03-15 53° 73° 382 178 53 15 8
03-16 32° 58° 405 191 56 15 8
03-17 27° 45° 419 195 56 15 8
03-18 34° 67° 447 213 65 15 8
03-19 53° 72° 488 244 85 28 16
03-20 32° 60° 513 258 90 28 16
03-21 26° 52° 530 266 90 28 16
03-22 28° 48° 546 272 90 28 16
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 22° 38° 554 272 90 28 16
03-24 35° 42° 571 278 90 28 16
03-25 28° 43° 584 282 90 28 16
03-26 27° 43° 597 284 90 28 16
03-27 26° 56° 616 293 90 28 16
03-28 40° 64° 646 313 100 30 16
03-29 57° 67° 686 343 120 42 23
03-30 49° 66° 721 369 135 50 25
03-31 37° 58° 747 384 141 50 25
04-01 22° 42° 757 384 141 50 25
04-02 32° 47° 775 392 141 50 25
04-03 46° 65° 808 415 154 55 26
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 36° 51° 829 427 155 55 26
04-05 42° 50° 853 441 159 55 26
04-06 33° 46° 871 448 159 55 26
04-07 27° 45° 885 453 159 55 26
04-08 23° 37° 893 453 159 55 26
04-09 23° 46° 906 455 159 55 26
04-10 33° 37° 918 458 159 55 26
04-11 32° 51° 938 467 159 55 26
04-12 27° 56° 958 477 159 55 26
04-13 38° 57° 983 492 164 55 26
04-14 46° 72° 1020 519 181 64 30
04-15 41° 53° 1045 534 186 64 30
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 34° 53° 1067 546 188 64 30
04-17 28° 61° 1089 559 191 64 30
04-18 49° 81° 1132 592 214 79 40
04-19 50° 70° 1170 619 231 88 44
04-20 38° 55° 1195 634 236 88 44
04-21 47° 74° 1233 662 254 99 49
04-22 43° 65° 1265 684 266 102 49
04-23 47° 77° 1305 714 286 114 56
04-24 48° 83° 1348 747 309 130 67
04-25 51° 76° 1390 779 331 143 75
04-26 42° 60° 1419 798 340 144 75
04-27 37° 66° 1448 817 350 146 75
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 44° 73° 1485 844 366 154 79
04-29 52° 84° 1531 880 392 172 92
04-30 38° 61° 1558 897 399 172 92
05-01 46° 68° 1593 922 414 179 94
05-02 51° 69° 1631 950 432 189 99
05-03 44° 52° 1657 966 438 189 99
05-04 40° 52° 1682 981 443 189 99
05-05 48° 68° 1718 1007 459 197 102
05-06 53° 59° 1752 1031 473 204 103
05-07 49° 75° 1792 1061 493 216 110
05-08 41° 54° 1817 1077 499 216 110
05-09 34° 64° 1844 1094 506 216 110
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 45° 76° 1883 1122 524 226 116
05-11 44° 66° 1916 1145 538 231 116
05-12 45° 80° 1956 1176 558 244 123
05-13 63° 70° 2001 1210 582 260 134
05-14 60° 74° 2046 1245 607 277 147
05-15 58° 82° 2094 1283 635 297 162
05-16 60° 82° 2143 1323 665 318 178
05-17 56° 68° 2184 1353 685 331 185
05-18 53° 60° 2218 1377 699 337 187
05-19 44° 57° 2246 1396 708 338 187
05-20 38° 56° 2271 1410 713 338 187
05-21 48° 51° 2299 1428 720 338 187
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 48° 53° 2328 1447 729 338 187
05-23 40° 54° 2353 1462 734 338 187
05-24 42° 61° 2383 1482 744 340 187
05-25 41° 65° 2413 1503 755 343 187
05-26 43° 70° 2448 1527 769 349 188
05-27 50° 73° 2487 1556 788 360 194
05-28 52° 58° 2520 1579 801 365 194
05-29 54° 65° 2558 1607 819 375 199
05-30 52° 77° 2600 1639 841 389 208
05-31 49° 64° 2634 1664 856 396 210
06-01 41° 67° 2667 1686 868 400 210
06-02 44° 79° 2707 1716 888 412 216
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 55° 87° 2756 1755 917 433 232
06-04 62° 85° 2807 1797 949 456 251
06-05 55° 67° 2846 1825 968 467 257
06-06 56° 75° 2890 1859 991 483 268
06-07 53° 78° 2933 1892 1015 498 278
06-08 56° 76° 2977 1927 1039 515 289
06-09 59° 78° 3024 1963 1065 533 303
06-10 52° 72° 3064 1993 1085 545 310
06-11 53° 86° 3112 2031 1113 565 324
06-12 59° 74° 3156 2065 1137 581 336
06-13 56° 72° 3198 2097 1159 595 345
06-14 55° 77° 3242 2131 1183 611 356
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 55° 79° 3287 2166 1208 628 368
06-16 56° 83° 3334 2204 1236 647 382
06-17 63° 88° 3388 2247 1269 673 402
06-18 68° 79° 3439 2288 1300 696 421
06-19 62° 73° 3484 2323 1326 713 433
06-20 59° 77° 3530 2359 1351 731 446
06-21 65° 89° 3585 2405 1387 758 468
06-22 77° 95° 3649 2459 1431 794 499
06-23 74° 95° 3712 2511 1474 829 529
06-24 75° 93° 3774 2563 1516 863 558
06-25 70° 79° 3827 2606 1548 888 577
06-26 65° 86° 3880 2649 1581 913 598
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 71° 91° 3939 2698 1620 944 623
06-28 67° 79° 3990 2739 1651 967 642
06-29 61° 87° 4042 2781 1683 991 661
06-30 69° 84° 4096 2825 1718 1017 682
07-01 71° 84° 4152 2871 1753 1045 705
07-02 63° 86° 4204 2913 1786 1069 724
07-03 67° 85° 4258 2957 1820 1095 745
07-04 61° 87° 4310 3000 1852 1120 764
07-05 68° 93° 4369 3048 1890 1150 790
07-06 72° 93° 4430 3099 1931 1183 818
07-07 65° 76° 4478 3138 1960 1203 833
07-08 57° 84° 4527 3176 1988 1224 849
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 69° 80° 4579 3218 2020 1248 868
07-10 63° 87° 4632 3261 2053 1273 888
07-11 65° 84° 4684 3304 2086 1298 907
07-12 71° 87° 4742 3351 2123 1327 932
07-13 71° 87° 4799 3398 2160 1356 955
07-14 65° 85° 4852 3441 2193 1381 976
07-15 64° 89° 4907 3486 2228 1408 998
07-16 70° 84° 4962 3531 2263 1435 1020
07-17 65° 75° 5010 3569 2291 1455 1035
07-18 55° 76° 5053 3602 2315 1470 1045
07-19 58° 82° 5102 3641 2343 1491 1060
07-20 66° 79° 5152 3681 2373 1513 1078
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 58° 77° 5198 3717 2399 1531 1091
07-22 54° 80° 5243 3752 2424 1548 1102
07-23 58° 89° 5294 3793 2455 1571 1121
07-24 72° 97° 5356 3846 2498 1606 1150
07-25 73° 84° 5413 3892 2534 1634 1174
07-26 69° 81° 5466 3935 2567 1659 1194
07-27 73° 91° 5526 3986 2608 1691 1221
07-28 69° 89° 5584 4033 2645 1721 1246
07-29 69° 87° 5640 4079 2681 1749 1268
07-30 64° 85° 5692 4121 2713 1773 1288
07-31 60° 74° 5737 4156 2738 1790 1300
08-01 56° 76° 5781 4190 2763 1806 1311
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 54° 78° 5825 4224 2787 1822 1322
08-03 57° 80° 5872 4261 2813 1841 1336
08-04 58° 82° 5920 4299 2841 1861 1351
08-05 63° 83° 5971 4340 2872 1884 1369
08-06 65° 84° 6023 4383 2905 1908 1388
08-07 65° 85° 6076 4426 2938 1933 1408
08-08 65° 89° 6131 4470 2972 1960 1430
08-09 69° 89° 6188 4518 3010 1990 1454
08-10 69° 92° 6247 4566 3048 2020 1480
08-11 69° 92° 6306 4615 3087 2051 1505
08-12 69° 90° 6363 4662 3124 2080 1530
08-13 68° 83° 6417 4706 3158 2106 1550
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 63° 82° 6467 4746 3189 2128 1568
08-15 63° 85° 6520 4789 3221 2153 1587
08-16 66° 90° 6576 4835 3257 2181 1610
08-17 63° 81° 6626 4875 3287 2203 1627
08-18 56° 78° 6670 4909 3312 2219 1639
08-19 63° 76° 6718 4947 3339 2239 1654
08-20 65° 70° 6763 4982 3365 2256 1666
08-21 63° 75° 6810 5019 3391 2275 1680
08-22 57° 81° 6857 5056 3418 2294 1694
08-23 64° 78° 6906 5096 3448 2315 1710
08-24 56° 76° 6950 5130 3472 2331 1721
08-25 54° 68° 6989 5158 3490 2342 1727
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 50° 70° 7027 5186 3508 2352 1732
08-27 49° 75° 7067 5216 3528 2364 1739
08-28 52° 69° 7105 5245 3547 2375 1744
08-29 47° 66° 7140 5270 3562 2381 1746
08-30 45° 72° 7177 5296 3578 2390 1750
08-31 47° 76° 7216 5326 3598 2401 1756
09-01 49° 78° 7258 5357 3619 2415 1765
09-02 50° 79° 7300 5389 3641 2429 1774
09-03 53° 81° 7345 5424 3666 2446 1786
09-04 53° 66° 7383 5452 3684 2456 1790
09-05 46° 72° 7420 5479 3701 2465 1794
09-06 51° 64° 7455 5505 3717 2472 1797
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 43° 67° 7489 5528 3730 2478 1798
09-08 44° 69° 7523 5552 3744 2484 1799
09-09 45° 76° 7562 5581 3763 2495 1805
09-10 51° 78° 7604 5614 3786 2509 1814
09-11 51° 79° 7647 5646 3808 2524 1824
09-12 53° 80° 7691 5680 3833 2540 1835
09-13 55° 78° 7736 5715 3857 2557 1846
09-14 51° 82° 7780 5749 3881 2573 1858
09-15 57° 82° 7827 5786 3908 2592 1872
09-16 54° 83° 7873 5823 3935 2611 1885
09-17 53° 83° 7919 5859 3961 2628 1898
09-18 56° 87° 7969 5898 3990 2650 1915
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 61° 77° 8016 5935 4017 2669 1929
09-20 56° 77° 8060 5969 4041 2685 1940
09-21 57° 72° 8102 6002 4064 2700 1949
09-22 61° 75° 8149 6038 4090 2718 1963
09-23 60° 75° 8194 6073 4115 2735 1975
09-24 63° 73° 8240 6109 4142 2753 1988
09-25 62° 75° 8287 6146 4168 2772 2001
09-26 54° 81° 8332 6181 4194 2789 2014
09-27 54° 86° 8380 6219 4222 2809 2029
09-28 58° 80° 8427 6257 4249 2828 2043
09-29 49° 82° 8471 6290 4272 2844 2054
09-30 50° 81° 8514 6324 4296 2859 2064
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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