Please Note

The GDD models have only been “ground-truthed” in the Great Lakes region. Use of models outside of this region, including the North East, Great Plains and Transition Zones, should be used with caution. We do not recommend the GDD models we use for the mid/southern transition zone and southern states.

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Crabgrass Germination Prediction (GDD 50)
forecast for Sat, Apr. 4. 2026

 

Forecasted GDD Total: 58 (Base 50) through Sat, Apr. 4, 2026

  

Rochester, NY

        

Forecast »

“Flashback” to 2025

3/27

3/28

3/29

3/30

3/31

4/1

4/2

4/3

4/4

4/5

4/6

4/7

4/8

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 24° 37° 9 0 0 0 0
02-16 22° 41° 18 0 0 0 0
02-17 33° 40° 32 4 0 0 0
02-18 30° 34° 42 4 0 0 0
02-19 30° 37° 53 6 0 0 0
02-20 33° 41° 68 10 0 0 0
02-21 30° 33° 78 10 0 0 0
02-22 29° 33° 87 10 0 0 0
02-23 20° 31° 91 10 0 0 0
02-24 14° 22° 91 10 0 0 0
02-25 21° 36° 97 10 0 0 0
02-26 14° 28° 97 10 0 0 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 13° 43° 104 10 0 0 0
02-28 26° 45° 117 14 0 0 0
03-01 13° 24° 117 14 0 0 0
03-02 6° 27° 117 14 0 0 0
03-03 20° 39° 125 14 0 0 0
03-04 32° 49° 143 23 0 0 0
03-05 30° 37° 155 25 0 0 0
03-06 31° 49° 173 33 0 0 0
03-07 51° 71° 213 62 19 11 6
03-08 42° 60° 241 81 28 12 6
03-09 46° 72° 278 108 45 21 10
03-10 41° 69° 311 130 58 26 10
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 33° 66° 338 148 65 26 10
03-12 29° 44° 353 152 65 26 10
03-13 24° 40° 363 153 65 26 10
03-14 27° 37° 373 153 65 26 10
03-15 26° 56° 392 162 65 26 10
03-16 29° 67° 418 177 71 26 10
03-17 16° 27° 418 177 71 26 10
03-18 10° 34° 418 177 71 26 10
03-19 30° 47° 435 184 71 26 10
03-20 29° 47° 450 190 71 26 10
03-21 31° 38° 463 192 71 26 10
03-22 33° 47° 481 200 71 26 10
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 31° 36° 492 201 71 26 10
03-24 25° 43° 503 203 71 26 10
03-25 24° 54° 521 210 71 26 10
03-26 44° 66° 554 233 84 30 10
03-27 24° 44° 566 235 84 30 10
03-28 20° 34° 571 235 84 30 10
03-29 28° 54° 590 244 84 30 10
03-30 39° 68° 622 266 95 34 10
03-31 55° 64° 659 293 113 43 15
04-01 35° 57° 683 307 117 43 15
04-02 33° 53° 704 318 117 43 15
04-03 51° 74° 744 348 138 56 22
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 39° 66° 775 369 148 58 22
04-05 44° 51° 800 384 154 58 22
04-06 33° 45° 817 391 154 58 22
04-07 30° 38° 829 393 154 58 22
04-08 25° 48° 843 398 154 58 22
04-09 37° 62° 871 415 161 58 22
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 20° 28° 2 0 0 0 0
02-16 20° 30° 6 0 0 0 0
02-17 13° 21° 6 0 0 0 0
02-18 9° 19° 6 0 0 0 0
02-19 13° 21° 6 0 0 0 0
02-20 15° 20° 6 0 0 0 0
02-21 15° 20° 6 0 0 0 0
02-22 16° 34° 9 0 0 0 0
02-23 25° 33° 16 0 0 0 0
02-24 29° 47° 32 6 0 0 0
02-25 37° 44° 50 14 0 0 0
02-26 32° 41° 65 19 0 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 34° 43° 81 25 0 0 0
02-28 29° 44° 95 29 0 0 0
03-01 17° 43° 103 29 0 0 0
03-02 10° 22° 103 29 0 0 0
03-03 19° 35° 108 29 0 0 0
03-04 30° 56° 129 41 1 0 0
03-05 45° 58° 159 60 11 2 0
03-06 29° 43° 173 64 11 2 0
03-07 31° 39° 186 67 11 2 0
03-08 23° 36° 193 67 11 2 0
03-09 26° 47° 208 72 11 2 0
03-10 36° 59° 233 87 17 2 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 34° 64° 261 104 24 2 0
03-12 27° 35° 270 104 24 2 0
03-13 26° 56° 289 113 24 2 0
03-14 24° 69° 313 128 28 2 0
03-15 52° 65° 349 154 45 10 3
03-16 47° 73° 388 182 63 20 9
03-17 29° 46° 403 188 63 20 9
03-18 25° 65° 426 201 66 20 9
03-19 45° 76° 465 229 84 31 14
03-20 34° 61° 490 245 90 31 14
03-21 27° 46° 505 250 90 31 14
03-22 25° 52° 521 256 90 31 14
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 21° 34° 527 256 90 31 14
03-24 32° 53° 548 267 90 31 14
03-25 32° 40° 562 271 90 31 14
03-26 26° 36° 571 271 90 31 14
03-27 22° 49° 585 275 90 31 14
03-28 33° 52° 605 285 91 31 14
03-29 29° 39° 617 287 91 31 14
03-30 30° 60° 641 301 94 31 14
03-31 35° 61° 667 316 100 31 14
04-01 30° 40° 680 319 100 31 14
04-02 29° 44° 694 324 100 31 14
04-03 47° 68° 729 349 116 38 16
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 39° 50° 752 362 118 38 16
04-05 42° 62° 782 382 129 40 16
04-06 37° 45° 802 392 129 40 16
04-07 30° 48° 819 399 129 40 16
04-08 24° 32° 825 399 129 40 16
04-09 22° 40° 834 399 129 40 16
04-10 29° 43° 848 403 129 40 16
04-11 38° 44° 867 412 129 40 16
04-12 38° 43° 886 421 129 40 16
04-13 35° 58° 910 435 133 40 16
04-14 38° 68° 942 456 144 44 16
04-15 36° 58° 966 471 149 44 16
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 33° 41° 981 476 149 44 16
04-17 31° 54° 1002 487 149 44 16
04-18 36° 73° 1034 509 162 48 16
04-19 48° 72° 1072 537 179 58 21
04-20 38° 51° 1095 550 182 58 21
04-21 38° 68° 1126 571 193 61 21
04-22 47° 58° 1156 591 204 63 21
04-23 36° 63° 1184 609 211 63 21
04-24 48° 75° 1224 638 231 75 27
04-25 53° 64° 1260 665 248 84 31
04-26 42° 62° 1291 686 258 86 31
04-27 43° 64° 1322 707 269 89 31
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 39° 70° 1355 729 282 94 31
04-29 52° 84° 1401 765 308 112 44
04-30 38° 52° 1423 778 311 112 44
05-01 42° 66° 1456 800 323 116 44
05-02 53° 70° 1495 830 342 128 51
05-03 44° 53° 1522 847 349 128 51
05-04 47° 55° 1550 865 358 128 51
05-05 51° 67° 1588 892 375 137 55
05-06 55° 68° 1627 922 395 149 62
05-07 54° 67° 1666 951 413 160 67
05-08 43° 55° 1693 968 420 160 67
05-09 37° 55° 1717 982 424 160 67
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 42° 70° 1751 1006 439 166 68
05-11 44° 59° 1781 1025 448 167 68
05-12 41° 78° 1819 1053 466 177 73
05-13 57° 77° 1863 1088 491 194 85
05-14 62° 70° 1907 1122 514 210 96
05-15 61° 76° 1954 1159 541 228 110
05-16 61° 82° 2003 1198 571 250 126
05-17 56° 74° 2047 1231 594 265 136
05-18 51° 58° 2079 1254 606 270 136
05-19 45° 57° 2108 1273 615 270 136
05-20 38° 57° 2133 1288 621 270 136
05-21 45° 56° 2162 1306 629 271 136
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 48° 56° 2192 1326 639 273 136
05-23 48° 52° 2220 1345 647 273 136
05-24 48° 57° 2250 1365 657 275 136
05-25 47° 62° 2283 1388 670 280 136
05-26 45° 70° 2318 1413 686 287 139
05-27 45° 74° 2356 1441 704 297 144
05-28 49° 67° 2392 1467 720 305 147
05-29 55° 69° 2432 1497 740 317 154
05-30 56° 74° 2475 1530 763 332 164
05-31 47° 60° 2507 1552 774 336 164
06-01 49° 58° 2539 1573 786 340 164
06-02 45° 71° 2574 1599 802 347 167
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 52° 85° 2621 1636 829 366 181
06-04 65° 90° 2677 1681 864 394 203
06-05 64° 74° 2724 1719 891 413 217
06-06 62° 70° 2768 1753 915 429 228
06-07 59° 79° 2815 1790 942 448 242
06-08 52° 75° 2857 1821 964 462 251
06-09 63° 78° 2905 1860 993 482 267
06-10 62° 73° 2951 1896 1018 500 279
06-11 61° 81° 3000 1935 1047 521 295
06-12 62° 75° 3046 1971 1073 539 308
06-13 54° 66° 3084 1999 1092 549 314
06-14 56° 70° 3125 2030 1113 562 322
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 60° 74° 3170 2065 1138 579 334
06-16 56° 76° 3214 2099 1162 595 345
06-17 61° 84° 3265 2140 1192 618 362
06-18 70° 82° 3319 2183 1226 644 383
06-19 62° 79° 3367 2222 1254 664 398
06-20 62° 76° 3414 2259 1282 683 413
06-21 62° 85° 3466 2301 1313 707 431
06-22 78° 88° 3527 2352 1354 740 459
06-23 76° 93° 3590 2404 1397 775 489
06-24 77° 94° 3653 2458 1441 810 520
06-25 72° 85° 3710 2505 1477 839 543
06-26 60° 73° 3754 2539 1502 855 555
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 64° 81° 3805 2580 1532 878 572
06-28 66° 84° 3858 2623 1565 903 592
06-29 61° 78° 3905 2660 1592 922 606
06-30 62° 89° 3959 2704 1626 948 627
07-01 72° 81° 4014 2749 1661 975 649
07-02 65° 83° 4066 2791 1694 999 669
07-03 65° 79° 4116 2831 1724 1021 686
07-04 57° 77° 4161 2866 1748 1038 697
07-05 58° 92° 4214 2909 1781 1063 717
07-06 74° 94° 4276 2961 1823 1097 746
07-07 71° 87° 4333 3008 1860 1126 770
07-08 67° 76° 4383 3048 1890 1148 787
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 64° 79° 4432 3087 1920 1169 804
07-10 65° 84° 4485 3130 1952 1194 823
07-11 66° 88° 4540 3175 1987 1221 845
07-12 72° 91° 4599 3224 2027 1252 872
07-13 75° 89° 4660 3274 2067 1285 899
07-14 70° 81° 4713 3318 2101 1310 920
07-15 67° 88° 4769 3364 2136 1338 942
07-16 67° 88° 4824 3409 2172 1365 965
07-17 67° 83° 4877 3452 2205 1390 985
07-18 59° 74° 4921 3486 2229 1406 996
07-19 54° 83° 4968 3523 2255 1425 1009
07-20 65° 80° 5019 3563 2286 1448 1027
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 59° 72° 5062 3597 2310 1463 1038
07-22 51° 74° 5103 3628 2331 1476 1046
07-23 52° 86° 5150 3665 2357 1495 1059
07-24 67° 94° 5209 3714 2396 1526 1085
07-25 72° 82° 5264 3759 2431 1553 1107
07-26 66° 89° 5319 3804 2466 1580 1129
07-27 73° 88° 5378 3853 2505 1611 1155
07-28 69° 92° 5436 3901 2544 1641 1181
07-29 70° 88° 5494 3948 2581 1671 1205
07-30 65° 86° 5548 3992 2615 1697 1226
07-31 60° 75° 5593 4028 2640 1714 1238
08-01 54° 74° 5635 4060 2663 1728 1248
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 50° 79° 5678 4093 2685 1743 1257
08-03 55° 82° 5725 4129 2712 1762 1271
08-04 58° 82° 5773 4168 2740 1782 1286
08-05 59° 83° 5822 4207 2769 1803 1302
08-06 64° 84° 5874 4249 2801 1827 1321
08-07 65° 83° 5926 4291 2833 1851 1340
08-08 64° 86° 5979 4334 2866 1876 1360
08-09 67° 90° 6036 4381 2903 1905 1384
08-10 69° 92° 6095 4429 2942 1936 1410
08-11 67° 92° 6152 4477 2980 1965 1435
08-12 71° 90° 6211 4526 3018 1996 1460
08-13 71° 84° 6267 4571 3054 2024 1483
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 66° 83° 6319 4614 3086 2048 1502
08-15 59° 85° 6369 4654 3116 2070 1519
08-16 63° 87° 6422 4697 3150 2095 1540
08-17 62° 80° 6471 4736 3178 2116 1555
08-18 56° 70° 6512 4767 3199 2129 1563
08-19 54° 80° 6557 4802 3224 2146 1575
08-20 58° 69° 6599 4833 3246 2160 1584
08-21 57° 71° 6640 4865 3268 2173 1593
08-22 57° 81° 6687 4902 3294 2192 1606
08-23 61° 82° 6737 4941 3324 2214 1623
08-24 63° 76° 6784 4979 3352 2233 1638
08-25 58° 72° 6827 5012 3375 2248 1648
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 55° 72° 6869 5043 3396 2262 1656
08-27 55° 70° 6909 5074 3416 2274 1663
08-28 54° 75° 6952 5107 3439 2289 1673
08-29 52° 63° 6988 5132 3455 2297 1676
08-30 48° 69° 7024 5159 3472 2305 1680
08-31 51° 73° 7064 5189 3492 2317 1687
09-01 48° 76° 7104 5219 3512 2329 1694
09-02 53° 79° 7148 5253 3536 2345 1705
09-03 57° 82° 7196 5291 3563 2365 1719
09-04 55° 75° 7239 5323 3586 2380 1729
09-05 52° 79° 7282 5357 3609 2395 1739
09-06 56° 67° 7321 5386 3628 2406 1745
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 54° 67° 7360 5414 3647 2417 1751
09-08 47° 67° 7394 5439 3662 2423 1753
09-09 46° 75° 7433 5468 3680 2434 1758
09-10 51° 77° 7475 5500 3702 2448 1767
09-11 50° 76° 7516 5530 3723 2461 1775
09-12 51° 75° 7557 5561 3744 2474 1783
09-13 53° 74° 7598 5593 3766 2487 1792
09-14 57° 76° 7643 5628 3790 2504 1803
09-15 55° 75° 7686 5661 3813 2519 1813
09-16 51° 76° 7728 5692 3835 2533 1822
09-17 52° 78° 7771 5725 3858 2548 1832
09-18 51° 81° 7815 5759 3882 2564 1843
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 51° 69° 7853 5787 3900 2574 1848
09-20 45° 67° 7887 5812 3914 2580 1849
09-21 47° 84° 7930 5845 3937 2595 1859
09-22 62° 77° 7978 5882 3965 2615 1874
09-23 64° 75° 8025 5920 3992 2634 1888
09-24 59° 74° 8070 5954 4017 2651 1900
09-25 64° 69° 8114 5989 4041 2667 1911
09-26 60° 73° 8159 6024 4066 2684 1923
09-27 56° 78° 8204 6059 4091 2701 1935
09-28 56° 77° 8249 6093 4116 2718 1947
09-29 47° 78° 8289 6124 4137 2730 1955
09-30 50° 71° 8328 6153 4155 2741 1960
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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