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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Relative Flowering Times for Broadleaf Weeds (GDD 50)
forecast for Fri, Mar. 20. 2026

 

Forecasted GDD Total: 20 (Base 50) through Fri, Mar. 20, 2026

  

Astoria, NY

        

Forecast »

“Flashback” to 2025

3/10

3/11

3/12

3/13

3/14

3/15

3/16

3/17

3/18

3/19

3/20

3/21

3/22

Late Season (Biennials and Perennials)

1401

Mid Season and Late Season (SA and Perennials)

601

Mid Season (Perennials)

201

Early and Mid Season (WA and Perennials)

21

Early Season (WA)

5

 

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° 40° 12 2 0 0 0
02-16 29° 39° 24 4 0 0 0
02-17 31° 44° 40 10 0 0 0
02-18 33° 39° 54 14 0 0 0
02-19 35° 40° 69 19 0 0 0
02-20 34° 38° 83 23 0 0 0
02-21 35° 45° 102 32 0 0 0
02-22 30° 39° 114 34 0 0 0
02-23 29° 34° 124 34 0 0 0
02-24 22° 31° 128 34 0 0 0
02-25 22° 40° 138 34 0 0 0
02-26 31° 44° 153 40 0 0 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 24° 40° 163 40 0 0 0
02-28 30° 50° 181 48 0 0 0
03-01 31° 42° 196 53 0 0 0
03-02 21° 31° 200 53 0 0 0
03-03 26° 36° 209 53 0 0 0
03-04 35° 45° 227 61 0 0 0
03-05 39° 41° 245 69 0 0 0
03-06 37° 40° 261 76 0 0 0
03-07 36° 45° 280 85 0 0 0
03-08 45° 65° 313 108 13 5 0
03-09 43° 68° 347 132 27 11 1
03-10 40° 71° 381 155 40 16 1
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 48° 60° 413 177 52 20 1
03-12 35° 56° 436 191 56 20 1
03-13 31° 41° 450 195 56 20 1
03-14 37° 52° 473 207 59 20 1
03-15 34° 44° 490 215 59 20 1
03-16 46° 54° 518 233 67 20 1
03-17 35° 43° 535 240 67 20 1
03-18 28° 39° 547 241 67 20 1
03-19 33° 45° 564 248 67 20 1
03-20 38° 52° 587 261 70 20 1
03-21 39° 51° 610 275 73 20 1
03-22 38° 50° 632 287 75 20 1
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 35° 48° 652 296 75 20 1
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 27° 36° 9 0 0 0 0
02-16 35° 47° 29 9 0 0 0
02-17 27° 35° 38 9 0 0 0
02-18 20° 28° 40 9 0 0 0
02-19 18° 31° 42 9 0 0 0
02-20 18° 29° 44 9 0 0 0
02-21 21° 35° 50 9 0 0 0
02-22 21° 38° 58 9 0 0 0
02-23 31° 46° 75 16 0 0 0
02-24 31° 46° 91 23 0 0 0
02-25 38° 52° 115 36 3 0 0
02-26 40° 56° 141 52 9 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 43° 51° 166 67 14 0 0
02-28 39° 50° 189 80 17 0 0
03-01 29° 62° 212 93 21 0 0
03-02 21° 34° 217 93 21 0 0
03-03 21° 38° 225 93 21 0 0
03-04 29° 48° 242 100 21 0 0
03-05 40° 52° 266 114 25 0 0
03-06 35° 52° 288 126 26 0 0
03-07 34° 50° 307 136 26 0 0
03-08 37° 45° 326 144 26 0 0
03-09 31° 53° 346 154 26 0 0
03-10 41° 62° 376 174 36 2 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 37° 60° 402 191 42 2 0
03-12 41° 52° 427 205 47 2 0
03-13 37° 48° 447 216 48 2 0
03-14 40° 52° 471 230 52 2 0
03-15 41° 47° 494 242 54 2 0
03-16 46° 56° 523 261 63 3 0
03-17 40° 57° 549 277 69 3 0
03-18 34° 60° 574 292 74 3 0
03-19 37° 60° 600 308 80 3 0
03-20 41° 49° 623 321 83 3 0
03-21 39° 52° 646 335 87 3 0
03-22 38° 60° 673 351 93 3 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 31° 48° 690 359 93 3 0
03-24 39° 49° 713 371 95 3 0
03-25 44° 57° 741 390 104 4 0
03-26 39° 50° 764 402 106 4 0
03-27 32° 52° 784 412 107 4 0
03-28 43° 61° 814 432 116 6 0
03-29 45° 81° 855 463 137 19 8
03-30 42° 48° 878 476 141 19 8
03-31 46° 66° 912 500 154 25 9
04-01 42° 58° 939 518 162 25 9
04-02 34° 46° 958 526 162 25 9
04-03 45° 66° 991 549 176 30 9
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 59° 69° 1033 581 198 44 18
04-05 44° 57° 1062 600 206 45 18
04-06 43° 56° 1089 617 214 45 18
04-07 40° 51° 1113 631 217 45 18
04-08 37° 46° 1132 640 217 45 18
04-09 31° 47° 1149 647 217 45 18
04-10 38° 48° 1170 658 218 45 18
04-11 42° 47° 1192 670 220 45 18
04-12 37° 41° 1209 677 220 45 18
04-13 39° 55° 1234 692 225 45 18
04-14 43° 63° 1265 714 237 48 18
04-15 49° 67° 1302 740 253 56 22
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 46° 51° 1328 756 259 56 22
04-17 43° 63° 1359 777 270 59 22
04-18 40° 64° 1389 797 280 61 22
04-19 54° 81° 1435 833 306 79 34
04-20 55° 72° 1476 865 328 93 43
04-21 47° 54° 1505 883 336 93 43
04-22 52° 75° 1547 915 358 107 52
04-23 55° 70° 1587 945 378 119 59
04-24 51° 70° 1625 974 397 129 64
04-25 55° 71° 1666 1005 418 142 72
04-26 58° 67° 1707 1035 438 155 80
04-27 47° 59° 1739 1057 450 159 80
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 48° 74° 1777 1086 469 169 86
04-29 51° 72° 1817 1115 488 181 93
04-30 63° 74° 1864 1152 515 200 106
05-01 50° 66° 1900 1178 531 208 109
05-02 58° 78° 1946 1214 557 226 122
05-03 59° 78° 1992 1250 583 244 135
05-04 59° 66° 2033 1281 604 257 143
05-05 59° 61° 2071 1309 622 267 149
05-06 58° 64° 2110 1338 641 278 154
05-07 56° 73° 2152 1370 663 292 163
05-08 58° 75° 2197 1405 688 309 175
05-09 54° 61° 2232 1430 703 316 178
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 51° 74° 2272 1461 724 329 185
05-11 53° 78° 2316 1495 748 344 196
05-12 51° 70° 2355 1523 766 355 201
05-13 59° 67° 2396 1554 787 368 210
05-14 59° 64° 2436 1584 807 380 216
05-15 61° 69° 2479 1617 830 395 226
05-16 62° 70° 2523 1651 854 411 237
05-17 62° 81° 2572 1690 883 432 253
05-18 61° 74° 2617 1726 909 450 266
05-19 57° 71° 2659 1757 930 463 275
05-20 48° 68° 2695 1783 946 471 278
05-21 49° 57° 2726 1804 957 474 278
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 48° 51° 2754 1822 965 474 278
05-23 47° 63° 2787 1845 978 479 278
05-24 49° 66° 2822 1870 993 487 280
05-25 52° 67° 2860 1898 1011 496 285
05-26 51° 72° 2899 1928 1031 508 291
05-27 54° 73° 2941 1959 1052 521 300
05-28 54° 66° 2979 1987 1070 532 305
05-29 55° 66° 3018 2016 1089 542 311
05-30 60° 72° 3061 2050 1113 558 321
05-31 56° 68° 3102 2080 1133 570 328
06-01 50° 68° 3139 2107 1150 579 332
06-02 52° 72° 3179 2137 1170 591 339
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 54° 78° 3222 2171 1194 607 350
06-04 58° 80° 3269 2207 1220 626 364
06-05 66° 85° 3323 2251 1254 651 384
06-06 69° 81° 3376 2294 1287 676 405
06-07 68° 75° 3425 2333 1316 698 421
06-08 63° 73° 3471 2370 1343 716 434
06-09 61° 64° 3512 2400 1363 729 442
06-10 63° 73° 3558 2436 1389 747 455
06-11 64° 83° 3610 2478 1421 770 474
06-12 68° 90° 3667 2525 1458 799 498
06-13 67° 78° 3717 2565 1488 822 515
06-14 59° 67° 3758 2597 1510 835 523
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 58° 63° 3797 2625 1528 845 529
06-16 60° 67° 3838 2657 1550 859 537
06-17 63° 66° 3881 2689 1572 873 547
06-18 64° 81° 3932 2730 1603 896 565
06-19 69° 88° 3988 2776 1639 925 588
06-20 67° 84° 4042 2820 1673 950 609
06-21 71° 87° 4099 2867 1710 980 633
06-22 75° 89° 4159 2917 1750 1011 660
06-23 78° 93° 4223 2971 1794 1047 690
06-24 80° 101° 4291 3029 1842 1087 725
06-25 82° 98° 4358 3087 1890 1127 760
06-26 67° 85° 4412 3130 1923 1153 781
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 64° 71° 4458 3166 1949 1170 793
06-28 64° 82° 4509 3207 1980 1193 811
06-29 75° 90° 4569 3257 2020 1226 839
06-30 74° 88° 4628 3306 2059 1256 865
07-01 74° 86° 4686 3355 2098 1287 890
07-02 73° 80° 4741 3399 2132 1313 911
07-03 70° 89° 4799 3447 2170 1343 936
07-04 65° 85° 4851 3490 2203 1368 956
07-05 65° 86° 4905 3533 2236 1393 977
07-06 71° 86° 4962 3580 2273 1422 1000
07-07 76° 86° 5020 3629 2312 1453 1026
07-08 76° 94° 5084 3682 2355 1488 1057
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 75° 89° 5144 3732 2395 1520 1084
07-10 72° 81° 5199 3777 2430 1547 1105
07-11 72° 81° 5253 3822 2465 1574 1127
07-12 73° 82° 5309 3867 2500 1602 1150
07-13 72° 80° 5363 3912 2535 1628 1171
07-14 74° 85° 5421 3959 2572 1657 1196
07-15 74° 84° 5478 4006 2609 1686 1220
07-16 76° 89° 5538 4056 2649 1718 1247
07-17 77° 92° 5601 4109 2692 1753 1276
07-18 74° 85° 5658 4156 2729 1782 1301
07-19 68° 81° 5711 4199 2762 1807 1320
07-20 76° 88° 5770 4249 2802 1839 1347
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 71° 87° 5827 4295 2838 1868 1371
07-22 67° 78° 5878 4336 2869 1890 1388
07-23 66° 81° 5929 4377 2900 1913 1407
07-24 69° 84° 5983 4422 2935 1940 1428
07-25 75° 94° 6046 4474 2977 1974 1458
07-26 74° 82° 6102 4520 3013 2002 1481
07-27 71° 83° 6157 4565 3048 2030 1503
07-28 74° 94° 6219 4617 3090 2064 1532
07-29 76° 96° 6283 4672 3135 2100 1563
07-30 79° 94° 6348 4726 3179 2136 1595
07-31 68° 89° 6404 4772 3215 2164 1618
08-01 63° 72° 6450 4808 3241 2182 1630
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 61° 79° 6498 4846 3269 2202 1646
08-03 62° 83° 6548 4886 3299 2224 1663
08-04 64° 87° 6602 4930 3333 2250 1684
08-05 68° 84° 6655 4974 3367 2276 1704
08-06 69° 77° 6707 5015 3398 2299 1722
08-07 66° 78° 6757 5055 3428 2321 1740
08-08 60° 79° 6804 5093 3456 2341 1754
08-09 59° 81° 6852 5131 3484 2361 1769
08-10 63° 87° 6905 5174 3517 2386 1789
08-11 67° 86° 6960 5218 3551 2413 1811
08-12 68° 86° 7015 5263 3586 2440 1833
08-13 73° 86° 7073 5311 3624 2469 1858
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 73° 88° 7131 5359 3662 2500 1883
08-15 74° 86° 7190 5408 3701 2530 1908
08-16 74° 82° 7245 5454 3737 2558 1931
08-17 72° 88° 7303 5501 3774 2588 1956
08-18 66° 77° 7353 5541 3804 2609 1972
08-19 62° 74° 7399 5577 3830 2627 1986
08-20 60° 69° 7442 5610 3853 2642 1995
08-21 60° 72° 7486 5644 3877 2658 2007
08-22 57° 83° 7534 5682 3905 2679 2022
08-23 64° 80° 7584 5723 3936 2701 2039
08-24 66° 79° 7634 5763 3966 2723 2056
08-25 69° 85° 7689 5808 4001 2750 2078
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 62° 79° 7738 5846 4029 2770 2094
08-27 60° 76° 7784 5882 4055 2788 2107
08-28 57° 77° 7829 5917 4080 2806 2119
08-29 65° 78° 7878 5957 4110 2827 2135
08-30 56° 76° 7922 5991 4134 2843 2146
08-31 56° 77° 7967 6025 4158 2859 2158
09-01 59° 77° 8013 6061 4184 2877 2171
09-02 59° 76° 8058 6096 4209 2895 2183
09-03 59° 75° 8103 6132 4235 2912 2195
09-04 61° 76° 8150 6168 4261 2930 2209
09-05 67° 81° 8202 6210 4293 2954 2228
09-06 67° 82° 8255 6253 4326 2979 2247
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 61° 68° 8297 6285 4348 2993 2257
09-08 55° 74° 8339 6318 4371 3008 2266
09-09 55° 73° 8381 6350 4393 3022 2275
09-10 62° 72° 8426 6385 4418 3039 2287
09-11 58° 80° 8474 6422 4445 3058 2301
09-12 60° 78° 8521 6459 4472 3077 2316
09-13 61° 75° 8567 6495 4498 3095 2329
09-14 63° 79° 8616 6534 4527 3116 2345
09-15 64° 80° 8666 6574 4557 3138 2361
09-16 63° 74° 8712 6610 4583 3157 2375
09-17 63° 70° 8756 6644 4607 3173 2386
09-18 66° 82° 8808 6686 4639 3196 2405
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 65° 84° 8861 6729 4672 3221 2424
09-20 61° 73° 8906 6764 4697 3238 2436
09-21 56° 69° 8946 6795 4718 3251 2444
09-22 53° 70° 8986 6824 4737 3262 2451
09-23 64° 80° 9036 6864 4767 3284 2468
09-24 68° 79° 9088 6906 4799 3308 2486
09-25 71° 75° 9139 6947 4830 3331 2504
09-26 67° 81° 9191 6989 4862 3355 2523
09-27 64° 78° 9239 7028 4891 3376 2539
09-28 65° 82° 9291 7069 4922 3399 2558
09-29 64° 78° 9340 7108 4951 3420 2574
09-30 63° 81° 9390 7148 4981 3442 2591
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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