Welcome!

It appears to be your first time visiting GDDTracker
Please enter your zip code for a customized experience. Also, be sure and watch our video introduction video.

   
       

Crabgrass Germination Prediction (GDD 50)
through Sun, Jul. 19. 2026

 

GDD Total: 1896 (Base 50) through Sun, Jul. 19, 2026

  

Lafayette, IN

        

Forecast »

“Flashback” to 2025

7/13

7/14

7/15

7/16

7/17

7/18

7/19

7/20

7/21

7/22

7/23

7/24

7/25

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 36° 59° 26 16 6 0 0
02-16 34° 61° 51 31 11 0 0
02-17 36° 58° 77 47 17 0 0
02-18 42° 70° 110 70 30 6 1
02-19 39° 60° 138 88 38 6 1
02-20 26° 52° 155 95 38 6 1
02-21 24° 31° 160 95 38 6 1
02-22 22° 27° 163 95 38 6 1
02-23 18° 29° 164 95 38 6 1
02-24 14° 38° 168 95 38 6 1
02-25 26° 47° 183 99 38 6 1
02-26 26° 45° 196 103 38 6 1
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 29° 63° 220 117 42 6 1
02-28 29° 50° 238 125 42 6 1
03-01 24° 37° 246 125 42 6 1
03-02 26° 45° 260 128 42 6 1
03-03 36° 43° 277 135 42 6 1
03-04 38° 49° 298 147 44 6 1
03-05 48° 60° 331 169 56 10 1
03-06 55° 77° 374 203 80 26 11
03-07 41° 65° 405 223 90 28 11
03-08 34° 59° 429 238 95 28 11
03-09 44° 69° 464 262 109 35 13
03-10 60° 71° 508 296 133 51 24
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 36° 70° 539 317 144 54 24
03-12 29° 47° 555 323 144 54 24
03-13 41° 53° 580 338 149 54 24
03-14 32° 46° 597 345 149 54 24
03-15 42° 69° 630 369 163 59 24
03-16 21° 47° 642 370 163 59 24
03-17 16° 25° 642 370 163 59 24
03-18 25° 50° 658 376 163 59 24
03-19 32° 70° 687 395 172 60 24
03-20 47° 81° 729 427 194 74 33
03-21 40° 74° 764 452 209 82 36
03-22 36° 69° 795 473 220 85 36
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 30° 43° 809 478 220 85 36
03-24 24° 54° 826 484 220 85 36
03-25 37° 69° 857 505 231 88 36
03-26 49° 81° 901 539 254 103 46
03-27 35° 47° 919 548 254 103 46
03-28 26° 47° 934 552 254 103 46
03-29 38° 64° 963 571 264 104 46
03-30 51° 76° 1005 603 285 118 55
03-31 54° 77° 1048 636 309 133 65
04-01 39° 48° 1070 648 310 133 65
04-02 39° 74° 1104 673 325 140 66
04-03 59° 74° 1149 707 349 156 78
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 44° 67° 1182 731 363 162 78
04-05 38° 52° 1205 743 366 162 78
04-06 39° 53° 1229 758 370 162 78
04-07 29° 44° 1244 762 370 162 78
04-08 35° 68° 1274 782 379 163 78
04-09 53° 77° 1317 815 403 179 89
04-10 46° 62° 1349 838 415 183 89
04-11 35° 61° 1375 854 421 183 89
04-12 52° 78° 1418 887 444 198 99
04-13 65° 80° 1469 927 475 220 116
04-14 68° 82° 1522 970 508 246 136
04-15 69° 77° 1573 1011 539 268 154
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 60° 74° 1618 1046 564 285 166
04-17 51° 81° 1662 1080 588 301 177
04-18 44° 71° 1697 1106 603 309 180
04-19 34° 54° 1719 1118 605 309 180
04-20 31° 56° 1741 1129 606 309 180
04-21 44° 76° 1778 1157 624 319 184
04-22 56° 80° 1824 1192 650 336 197
04-23 56° 81° 1871 1229 676 355 211
04-24 56° 72° 1912 1261 698 369 219
04-25 49° 70° 1950 1289 716 378 224
04-26 47° 69° 1986 1314 732 386 227
04-27 51° 64° 2022 1340 747 394 230
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 51° 60° 2055 1364 761 399 230
04-29 44° 61° 2086 1384 772 402 230
04-30 35° 58° 2111 1399 776 402 230
05-01 42° 51° 2135 1414 781 402 230
05-02 36° 53° 2158 1426 784 402 230
05-03 38° 62° 2186 1445 792 402 230
05-04 48° 74° 2225 1473 811 413 236
05-05 48° 63° 2259 1497 824 419 237
05-06 42° 58° 2287 1515 832 419 237
05-07 36° 59° 2313 1531 838 419 237
05-08 49° 62° 2346 1555 852 424 238
05-09 51° 74° 2386 1585 872 437 245
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 50° 66° 2422 1611 888 445 248
05-11 43° 67° 2455 1634 901 450 248
05-12 40° 79° 2493 1661 919 459 252
05-13 47° 62° 2526 1684 931 464 252
05-14 38° 67° 2556 1705 942 467 252
05-15 47° 69° 2593 1731 958 475 256
05-16 60° 77° 2639 1767 984 493 269
05-17 60° 83° 2689 1807 1014 515 286
05-18 65° 81° 2740 1848 1046 538 304
05-19 64° 80° 2790 1888 1076 560 321
05-20 54° 68° 2829 1917 1094 571 327
05-21 48° 67° 2864 1943 1110 579 330
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 52° 71° 2904 1972 1130 590 336
05-23 55° 79° 2949 2007 1155 607 348
05-24 59° 71° 2992 2041 1178 623 358
05-25 49° 80° 3035 2073 1201 637 368
05-26 55° 79° 3080 2108 1226 654 380
05-27 64° 82° 3131 2149 1256 677 398
05-28 57° 84° 3179 2187 1285 697 413
05-29 55° 82° 3226 2224 1311 716 427
05-30 54° 80° 3271 2259 1336 733 439
05-31 52° 79° 3314 2292 1359 748 449
06-01 60° 74° 3359 2328 1385 765 461
06-02 56° 78° 3404 2362 1410 782 473
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 50° 82° 3448 2397 1434 799 485
06-04 56° 84° 3496 2435 1462 819 499
06-05 64° 84° 3549 2477 1494 843 519
06-06 69° 85° 3604 2522 1529 870 541
06-07 68° 85° 3658 2566 1564 896 562
06-08 69° 80° 3711 2609 1596 921 582
06-09 72° 85° 3767 2656 1633 949 605
06-10 70° 89° 3825 2703 1671 979 630
06-11 65° 84° 3878 2746 1703 1004 650
06-12 63° 79° 3926 2785 1732 1025 665
06-13 60° 80° 3975 2823 1760 1045 681
06-14 59° 73° 4019 2857 1784 1061 692
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 55° 73° 4061 2889 1806 1075 701
06-16 56° 74° 4104 2922 1830 1090 711
06-17 53° 70° 4144 2952 1849 1102 718
06-18 63° 74° 4190 2988 1876 1120 731
06-19 57° 77° 4235 3023 1901 1137 743
06-20 63° 78° 4284 3062 1929 1158 759
06-21 57° 74° 4327 3095 1953 1173 769
06-22 59° 72° 4371 3129 1976 1189 780
06-23 53° 75° 4413 3161 1998 1203 789
06-24 52° 79° 4456 3194 2022 1218 799
06-25 63° 79° 4505 3234 2051 1240 816
06-26 62° 73° 4551 3269 2077 1257 828
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 65° 77° 4600 3309 2106 1278 844
06-28 67° 86° 4655 3353 2141 1305 866
06-29 73° 91° 4715 3403 2181 1337 893
06-30 74° 92° 4776 3454 2222 1370 921
07-01 74° 92° 4837 3506 2263 1404 950
07-02 73° 93° 4898 3557 2304 1436 977
07-03 73° 93° 4959 3608 2345 1470 1005
07-04 70° 88° 5016 3655 2382 1499 1030
07-05 69° 82° 5070 3698 2415 1524 1050
07-06 68° 82° 5123 3741 2448 1549 1070
07-07 67° 84° 5176 3784 2482 1574 1090
07-08 64° 85° 5228 3827 2514 1599 1110
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 67° 88° 5284 3872 2549 1626 1132
07-10 68° 86° 5338 3917 2584 1653 1153
07-11 68° 80° 5390 3959 2616 1677 1172
07-12 64° 85° 5443 4001 2649 1701 1192
07-13 61° 87° 5495 4044 2681 1726 1212
07-14 64° 90° 5550 4089 2716 1753 1234
07-15 69° 90° 5608 4136 2753 1782 1258
07-16 70° 91° 5667 4185 2792 1813 1284
07-17 73° 86° 5725 4233 2830 1843 1309
07-18 72° 91° 5784 4282 2870 1874 1335
07-19 63° 80° 5834 4322 2899 1896 1352
07-20 61° 84° 5884 4362 2930 1918 1369
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 70° 87° 5941 4409 2966 1947 1393
07-22 63° 76° 5988 4447 2994 1967 1407
07-23 54° 79° 6033 4481 3019 1983 1419
07-24 58° 80° 6080 4518 3046 2002 1433
07-25 61° 84° 6130 4559 3076 2025 1451
07-26 65° 87° 6185 4603 3110 2051 1472
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 29° 37° 11 1 0 0 0
02-16 17° 31° 13 1 0 0 0
02-17 7° 16° 13 1 0 0 0
02-18 3° 17° 13 1 0 0 0
02-19 10° 19° 13 1 0 0 0
02-20 4° 24° 13 1 0 0 0
02-21 11° 32° 13 1 0 0 0
02-22 13° 39° 17 1 0 0 0
02-23 21° 47° 29 3 0 0 0
02-24 34° 54° 51 15 2 0 0
02-25 34° 58° 76 30 7 0 0
02-26 28° 52° 93 37 7 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 34° 52° 114 48 7 0 0
02-28 30° 63° 139 63 12 0 0
03-01 19° 39° 146 63 12 0 0
03-02 14° 36° 149 63 12 0 0
03-03 27° 46° 163 67 12 0 0
03-04 42° 55° 190 84 19 0 0
03-05 32° 53° 211 94 19 0 0
03-06 30° 40° 224 97 19 0 0
03-07 30° 41° 237 101 19 0 0
03-08 30° 48° 254 107 19 0 0
03-09 30° 58° 276 120 21 0 0
03-10 34° 68° 305 139 30 1 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 43° 64° 336 160 41 4 0
03-12 35° 64° 364 177 49 4 0
03-13 35° 73° 396 199 61 8 0
03-14 45° 78° 435 229 80 20 7
03-15 56° 70° 476 260 101 33 15
03-16 32° 55° 498 272 103 33 15
03-17 27° 52° 516 279 103 33 15
03-18 43° 73° 552 305 119 41 18
03-19 50° 68° 588 332 136 49 21
03-20 32° 48° 606 339 136 49 21
03-21 28° 56° 626 350 136 49 21
03-22 37° 50° 648 361 138 49 21
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 33° 47° 666 369 138 49 21
03-24 34° 52° 687 380 139 49 21
03-25 34° 49° 706 390 139 49 21
03-26 28° 55° 725 399 139 49 21
03-27 38° 56° 750 414 144 49 21
03-28 47° 80° 792 445 165 63 30
03-29 59° 66° 832 476 186 75 37
03-30 54° 72° 874 507 207 89 46
03-31 34° 49° 893 517 207 89 46
04-01 29° 49° 910 524 207 89 46
04-02 43° 78° 949 552 226 99 51
04-03 48° 64° 983 576 240 105 52
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 41° 53° 1007 591 244 105 52
04-05 43° 56° 1035 608 252 105 52
04-06 39° 47° 1055 619 252 105 52
04-07 30° 52° 1074 627 252 105 52
04-08 23° 45° 1086 629 252 105 52
04-09 30° 46° 1102 635 252 105 52
04-10 35° 53° 1124 647 254 105 52
04-11 37° 51° 1146 660 257 105 52
04-12 29° 58° 1168 671 258 105 52
04-13 46° 64° 1200 694 271 110 52
04-14 53° 68° 1239 722 289 120 57
04-15 43° 55° 1266 739 296 120 57
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 34° 55° 1289 752 299 120 57
04-17 39° 66° 1320 773 310 123 57
04-18 53° 79° 1364 807 334 139 68
04-19 51° 70° 1402 835 352 149 74
04-20 48° 69° 1439 862 369 158 78
04-21 49° 67° 1475 888 385 166 81
04-22 40° 72° 1509 912 399 172 81
04-23 50° 78° 1551 944 421 186 90
04-24 50° 82° 1595 978 445 202 101
04-25 46° 68° 1630 1003 460 209 104
04-26 43° 59° 1659 1022 469 210 104
04-27 36° 68° 1688 1042 479 212 104
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 51° 81° 1732 1076 503 228 115
04-29 57° 80° 1779 1112 529 246 128
04-30 47° 64° 1812 1136 543 252 129
05-01 59° 72° 1856 1169 566 267 139
05-02 56° 70° 1897 1200 587 280 147
05-03 47° 63° 1930 1223 600 285 147
05-04 45° 49° 1955 1238 605 285 147
05-05 49° 63° 1989 1262 619 291 148
05-06 48° 73° 2027 1290 637 302 153
05-07 50° 75° 2068 1321 658 314 161
05-08 50° 69° 2105 1349 676 324 166
05-09 41° 68° 2138 1371 689 329 166
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 39° 80° 2176 1399 706 338 170
05-11 43° 79° 2215 1428 725 349 177
05-12 52° 78° 2258 1462 749 365 187
05-13 58° 74° 2302 1496 773 381 198
05-14 60° 78° 2350 1533 800 400 212
05-15 63° 89° 2404 1578 835 427 234
05-16 62° 86° 2456 1619 866 451 253
05-17 56° 71° 2497 1651 888 464 261
05-18 49° 72° 2536 1679 906 474 267
05-19 49° 73° 2575 1708 925 486 273
05-20 51° 64° 2610 1734 941 493 275
05-21 52° 59° 2644 1757 954 498 275
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 47° 56° 2673 1776 963 499 275
05-23 41° 65° 2704 1798 975 503 275
05-24 44° 70° 2739 1822 990 510 277
05-25 52° 64° 2775 1848 1006 518 280
05-26 46° 71° 2811 1875 1022 526 284
05-27 56° 70° 2852 1906 1043 539 292
05-28 57° 66° 2892 1935 1063 551 298
05-29 51° 69° 2930 1963 1081 561 303
05-30 56° 75° 2974 1997 1104 576 314
05-31 50° 71° 3012 2026 1123 587 320
06-01 41° 73° 3048 2051 1138 594 322
06-02 47° 81° 3090 2083 1160 608 331
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 61° 87° 3141 2125 1192 632 350
06-04 65° 78° 3191 2164 1221 653 366
06-05 61° 72° 3235 2199 1246 670 377
06-06 63° 77° 3283 2237 1274 690 392
06-07 57° 78° 3329 2272 1299 707 405
06-08 61° 80° 3377 2311 1328 728 420
06-09 57° 76° 3422 2345 1352 745 432
06-10 51° 77° 3464 2377 1374 759 441
06-11 56° 86° 3513 2416 1403 780 457
06-12 62° 84° 3564 2458 1435 803 475
06-13 68° 74° 3613 2497 1464 824 491
06-14 62° 71° 3658 2531 1488 841 503
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 64° 80° 3708 2572 1519 863 520
06-16 64° 83° 3760 2613 1550 886 539
06-17 66° 86° 3814 2657 1584 912 560
06-18 67° 86° 3868 2701 1618 939 581
06-19 66° 81° 3919 2743 1650 962 599
06-20 65° 82° 3971 2784 1681 985 618
06-21 71° 92° 4030 2834 1721 1017 644
06-22 75° 92° 4092 2885 1762 1050 673
06-23 73° 92° 4152 2936 1803 1083 700
06-24 75° 91° 4213 2987 1844 1116 728
06-25 73° 91° 4273 3037 1884 1148 755
06-26 71° 92° 4333 3087 1924 1180 782
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 74° 89° 4393 3136 1963 1212 809
06-28 71° 88° 4450 3184 2001 1241 833
06-29 69° 88° 4507 3231 2038 1270 857
06-30 72° 87° 4565 3278 2076 1300 882
07-01 71° 84° 4620 3324 2111 1327 905
07-02 63° 85° 4672 3366 2143 1351 923
07-03 65° 88° 4727 3410 2178 1378 945
07-04 66° 89° 4783 3456 2213 1405 968
07-05 68° 91° 4840 3504 2251 1435 992
07-06 72° 89° 4899 3552 2289 1465 1018
07-07 66° 81° 4950 3594 2321 1489 1037
07-08 59° 86° 5001 3635 2352 1512 1054
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 71° 83° 5056 3680 2387 1539 1076
07-10 65° 87° 5110 3724 2421 1565 1097
07-11 72° 90° 5169 3773 2460 1596 1123
07-12 74° 85° 5227 3820 2497 1625 1148
07-13 67° 84° 5281 3864 2531 1651 1169
07-14 65° 85° 5333 3907 2564 1676 1189
07-15 68° 89° 5390 3953 2600 1704 1212
07-16 71° 88° 5447 4001 2638 1734 1236
07-17 69° 83° 5501 4045 2672 1760 1257
07-18 64° 81° 5552 4085 2702 1782 1275
07-19 67° 82° 5604 4127 2735 1807 1294
07-20 69° 81° 5657 4171 2768 1832 1314
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 69° 82° 5711 4214 2802 1858 1335
07-22 65° 84° 5764 4257 2834 1882 1355
07-23 65° 90° 5819 4302 2870 1910 1377
07-24 74° 93° 5880 4354 2911 1943 1406
07-25 73° 89° 5940 4403 2950 1974 1432
07-26 71° 91° 5999 4452 2989 2005 1458
07-27 75° 88° 6058 4502 3029 2037 1484
07-28 73° 88° 6117 4550 3068 2068 1510
07-29 70° 91° 6176 4599 3106 2098 1536
07-30 70° 88° 6233 4646 3143 2127 1560
07-31 63° 72° 6278 4682 3169 2145 1572
08-01 58° 77° 6324 4717 3194 2162 1585
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 56° 76° 6368 4751 3218 2178 1596
08-03 53° 77° 6411 4785 3242 2194 1606
08-04 62° 81° 6461 4824 3271 2215 1623
08-05 61° 82° 6510 4863 3301 2237 1639
08-06 62° 86° 6562 4905 3332 2261 1658
08-07 66° 87° 6617 4950 3367 2287 1680
08-08 68° 89° 6673 4996 3403 2316 1703
08-09 68° 90° 6730 5043 3440 2344 1727
08-10 69° 89° 6787 5090 3477 2373 1751
08-11 70° 88° 6844 5137 3514 2402 1775
08-12 69° 88° 6900 5184 3551 2431 1799
08-13 68° 86° 6955 5229 3586 2458 1820
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 61° 85° 7006 5270 3617 2481 1839
08-15 65° 90° 7062 5315 3653 2509 1861
08-16 71° 92° 7122 5365 3692 2540 1888
08-17 68° 87° 7177 5411 3728 2568 1910
08-18 68° 84° 7231 5455 3762 2594 1931
08-19 71° 83° 7286 5500 3797 2621 1953
08-20 66° 77° 7336 5540 3827 2643 1970
08-21 65° 77° 7385 5578 3856 2664 1986
08-22 58° 76° 7430 5614 3881 2681 1998
08-23 58° 81° 7477 5651 3908 2700 2012
08-24 58° 74° 7521 5685 3932 2716 2023
08-25 49° 70° 7559 5712 3949 2725 2028
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 48° 72° 7596 5740 3967 2735 2033
08-27 48° 75° 7636 5769 3986 2747 2039
08-28 57° 78° 7681 5805 4012 2764 2051
08-29 50° 74° 7721 5835 4032 2776 2058
08-30 51° 75° 7762 5866 4053 2789 2066
08-31 50° 76° 7803 5897 4074 2802 2074
09-01 49° 79° 7845 5929 4096 2816 2084
09-02 53° 82° 7891 5964 4122 2834 2096
09-03 52° 80° 7935 5999 4146 2850 2107
09-04 48° 67° 7971 6024 4161 2857 2110
09-05 51° 70° 8009 6053 4180 2868 2115
09-06 46° 68° 8044 6078 4195 2875 2117
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 45° 69° 8079 6102 4209 2881 2119
09-08 41° 71° 8113 6126 4224 2888 2120
09-09 44° 76° 8151 6154 4241 2898 2125
09-10 55° 82° 8198 6191 4268 2916 2139
09-11 59° 83° 8246 6230 4297 2937 2154
09-12 53° 85° 8293 6267 4324 2956 2169
09-13 58° 72° 8336 6300 4347 2971 2178
09-14 62° 87° 8389 6342 4379 2995 2198
09-15 58° 87° 8439 6383 4410 3018 2215
09-16 57° 83° 8488 6421 4438 3038 2231
09-17 55° 86° 8536 6459 4466 3058 2246
09-18 56° 89° 8586 6499 4497 3081 2263
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 58° 89° 8637 6541 4528 3104 2282
09-20 60° 86° 8689 6582 4559 3127 2300
09-21 65° 83° 8741 6624 4591 3151 2319
09-22 65° 74° 8788 6662 4619 3171 2333
09-23 61° 80° 8837 6700 4647 3191 2349
09-24 63° 77° 8884 6738 4675 3211 2364
09-25 60° 75° 8930 6773 4701 3229 2376
09-26 52° 81° 8974 6808 4725 3245 2388
09-27 52° 86° 9022 6845 4752 3264 2402
09-28 55° 88° 9071 6885 4782 3286 2418
09-29 58° 89° 9123 6926 4813 3309 2437
09-30 57° 85° 9172 6965 4842 3330 2453
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.


 

 

© Copyright 2004-2026, Department of Crop and Soil Sciences, Michigan State University.
Weather data and programming assistance provided by Enviro-Weather and NWS
All Rights Reserved. Custom web development by Dynamite Inc.