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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Black Turfgrass Ataenius Egg Laying (GDD 50)
through Wed, Apr. 1. 2026

 

GDD Total: 259 (Base 50) through Wed, Apr. 1, 2026

  

Columbia, MO

        

Forecast »

“Flashback” to 2025

3/28

3/29

3/30

3/31

4/1

4/2

4/3

4/4

4/5

4/6

4/7

4/8

4/9

Over

1400

Second Generation Egg Laying

1200

Hatch and Development

200

First Generation Egg Laying

150

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 44° 58° 29 19 9 1 0
02-16 39° 65° 59 39 19 3 0
02-17 47° 61° 91 61 31 7 0
02-18 49° 69° 128 88 48 16 4
02-19 39° 69° 160 110 60 20 4
02-20 24° 39° 170 110 60 20 4
02-21 25° 38° 180 110 60 20 4
02-22 19° 31° 183 110 60 20 4
02-23 11° 29° 183 110 60 20 4
02-24 19° 60° 200 118 60 20 4
02-25 35° 56° 224 131 64 20 4
02-26 34° 62° 250 148 70 20 4
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 37° 74° 284 171 84 26 4
02-28 39° 65° 314 191 94 28 4
03-01 24° 44° 326 194 94 28 4
03-02 33° 38° 340 197 94 28 4
03-03 38° 50° 362 209 96 28 4
03-04 44° 50° 387 224 101 28 4
03-05 45° 58° 417 244 111 30 4
03-06 55° 76° 460 278 135 45 15
03-07 38° 64° 489 297 143 46 15
03-08 33° 68° 518 315 152 47 15
03-09 48° 82° 561 348 175 62 25
03-10 61° 84° 611 389 205 84 43
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 36° 69° 642 409 216 87 43
03-12 30° 54° 662 419 216 87 43
03-13 44° 55° 689 436 223 87 43
03-14 37° 68° 719 456 233 89 43
03-15 31° 65° 745 472 239 89 43
03-16 13° 29° 745 472 239 89 43
03-17 13° 34° 746 472 239 89 43
03-18 34° 68° 775 491 248 90 43
03-19 49° 78° 817 523 270 103 51
03-20 51° 89° 865 561 298 123 66
03-21 56° 89° 915 601 328 146 84
03-22 47° 78° 956 632 349 158 91
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 34° 50° 976 642 349 158 91
03-24 38° 65° 1005 661 358 160 91
03-25 46° 84° 1048 694 381 174 101
03-26 58° 92° 1101 737 414 199 121
03-27 42° 56° 1128 754 421 199 121
03-28 29° 58° 1149 765 422 199 121
03-29 44° 71° 1185 791 438 207 123
03-30 60° 86° 1236 832 469 230 141
03-31 66° 79° 1286 872 499 252 158
04-01 49° 63° 1320 896 513 259 160
04-02 52° 74° 1361 927 534 271 168
04-03 53° 80° 1406 962 559 288 179
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 45° 54° 1434 980 567 288 179
04-05 36° 59° 1459 995 572 288 179
04-06 39° 60° 1487 1013 580 288 179
04-07 36° 56° 1511 1027 584 288 179
04-08 45° 72° 1547 1053 600 297 183
04-09 54° 73° 1589 1085 622 310 192
04-10 56° 72° 1631 1117 644 324 200
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 28° 40° 12 2 0 0 0
02-16 15° 27° 12 2 0 0 0
02-17 11° 16° 12 2 0 0 0
02-18 1° 11° 12 2 0 0 0
02-19 -1° 12° 12 2 0 0 0
02-20 -6° 15° 12 2 0 0 0
02-21 -2° 23° 12 2 0 0 0
02-22 13° 39° 16 2 0 0 0
02-23 25° 57° 35 11 0 0 0
02-24 38° 61° 63 29 8 0 0
02-25 36° 63° 90 46 15 0 0
02-26 45° 61° 121 67 26 3 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 36° 58° 146 83 31 3 0
02-28 37° 70° 178 104 43 7 0
03-01 28° 49° 194 110 43 7 0
03-02 22° 50° 208 114 43 7 0
03-03 36° 67° 237 134 52 8 0
03-04 49° 59° 269 155 64 12 0
03-05 28° 47° 285 161 64 12 0
03-06 25° 44° 297 163 64 12 0
03-07 39° 68° 329 185 76 16 0
03-08 31° 50° 347 193 76 16 0
03-09 32° 62° 372 208 81 16 0
03-10 38° 73° 406 232 95 22 1
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 48° 75° 445 261 114 33 7
03-12 44° 76° 483 289 132 43 12
03-13 48° 82° 526 322 155 58 22
03-14 57° 83° 574 360 182 77 37
03-15 39° 58° 600 376 189 77 37
03-16 31° 49° 618 384 189 77 37
03-17 32° 74° 649 405 200 81 37
03-18 56° 81° 696 442 226 99 50
03-19 37° 69° 727 463 238 102 50
03-20 30° 49° 745 471 238 102 50
03-21 35° 65° 773 489 246 103 50
03-22 35° 63° 800 506 253 103 50
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 44° 60° 830 526 263 104 50
03-24 39° 55° 855 541 268 104 50
03-25 39° 62° 883 559 276 105 50
03-26 40° 63° 913 579 286 107 50
03-27 48° 69° 949 605 302 115 54
03-28 56° 77° 994 640 327 132 66
03-29 61° 74° 1039 676 353 149 78
03-30 44° 65° 1072 698 365 154 78
03-31 37° 54° 1096 712 369 154 78
04-01 38° 62° 1123 730 377 154 78
04-02 59° 75° 1168 764 401 171 90
04-03 47° 57° 1198 785 412 173 90
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 45° 48° 1223 799 416 173 90
04-05 41° 44° 1244 810 417 173 90
04-06 36° 49° 1265 821 418 173 90
04-07 33° 58° 1288 834 421 173 90
04-08 31° 55° 1309 845 422 173 90
04-09 44° 72° 1345 871 438 181 93
04-10 46° 68° 1380 896 453 188 95
04-11 44° 57° 1409 915 462 188 95
04-12 39° 68° 1440 937 474 192 95
04-13 54° 83° 1487 973 500 211 108
04-14 54° 71° 1527 1003 520 223 116
04-15 42° 61° 1557 1023 530 225 116
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 40° 73° 1592 1048 545 231 117
04-17 54° 82° 1637 1084 571 249 130
04-18 60° 76° 1684 1120 597 267 143
04-19 49° 58° 1715 1141 608 271 143
04-20 50° 72° 1754 1171 628 282 149
04-21 49° 67° 1790 1197 644 290 152
04-22 52° 80° 1834 1230 667 306 163
04-23 56° 79° 1880 1266 693 323 175
04-24 57° 80° 1926 1302 719 341 189
04-25 58° 70° 1968 1334 741 356 198
04-26 53° 59° 2002 1359 756 362 199
04-27 51° 60° 2036 1382 769 367 200
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 58° 83° 2084 1421 798 388 215
04-29 54° 74° 2126 1452 819 402 224
04-30 54° 68° 2165 1481 838 413 230
05-01 59° 73° 2209 1515 862 428 241
05-02 50° 67° 2245 1541 878 437 244
05-03 46° 56° 2274 1560 887 438 244
05-04 42° 66° 2306 1582 899 442 244
05-05 47° 66° 2341 1607 914 448 246
05-06 46° 72° 2378 1634 931 457 250
05-07 57° 73° 2421 1667 954 473 260
05-08 55° 72° 2463 1699 976 486 269
05-09 52° 73° 2503 1729 996 498 276
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 45° 79° 2543 1759 1016 510 283
05-11 52° 80° 2587 1793 1040 526 294
05-12 54° 78° 2631 1827 1064 543 305
05-13 59° 79° 2678 1864 1091 562 319
05-14 61° 84° 2729 1905 1122 584 337
05-15 68° 86° 2784 1950 1157 611 358
05-16 57° 82° 2831 1988 1185 631 373
05-17 57° 75° 2875 2021 1208 647 384
05-18 57° 79° 2921 2057 1234 665 397
05-19 63° 78° 2970 2096 1263 685 413
05-20 61° 73° 3015 2131 1288 702 425
05-21 53° 71° 3054 2160 1307 714 431
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 47° 69° 3091 2187 1324 722 434
05-23 45° 70° 3126 2212 1339 730 437
05-24 56° 72° 3168 2244 1361 744 446
05-25 58° 63° 3207 2273 1380 754 451
05-26 55° 67° 3245 2301 1398 765 457
05-27 57° 70° 3287 2333 1420 778 466
05-28 57° 71° 3329 2365 1442 792 475
05-29 57° 63° 3367 2393 1460 802 480
05-30 54° 77° 3410 2426 1483 818 490
05-31 56° 81° 3457 2463 1510 837 504
06-01 61° 84° 3508 2504 1541 859 522
06-02 62° 88° 3561 2547 1574 884 541
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 65° 86° 3614 2590 1607 910 562
06-04 63° 67° 3658 2624 1631 925 572
06-05 63° 72° 3703 2659 1656 942 584
06-06 63° 72° 3748 2695 1682 960 597
06-07 62° 72° 3794 2730 1707 977 609
06-08 57° 83° 3842 2768 1735 997 625
06-09 58° 79° 3889 2805 1762 1016 638
06-10 55° 79° 3934 2840 1787 1033 650
06-11 60° 85° 3984 2880 1817 1056 668
06-12 68° 76° 4034 2920 1847 1078 685
06-13 68° 73° 4083 2959 1876 1099 701
06-14 66° 82° 4135 3001 1908 1123 720
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 65° 80° 4186 3042 1939 1145 737
06-16 65° 84° 4238 3084 1971 1170 757
06-17 67° 86° 4293 3129 2006 1197 779
06-18 68° 81° 4345 3171 2038 1221 798
06-19 63° 83° 4396 3212 2069 1244 816
06-20 67° 90° 4453 3259 2106 1272 839
06-21 77° 91° 4515 3311 2148 1306 868
06-22 75° 91° 4575 3361 2188 1339 896
06-23 74° 91° 4635 3412 2229 1371 923
06-24 74° 89° 4695 3461 2268 1403 950
06-25 75° 90° 4756 3512 2309 1436 978
06-26 74° 90° 4816 3562 2349 1468 1005
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 70° 85° 4871 3608 2385 1495 1027
06-28 70° 87° 4928 3654 2421 1524 1051
06-29 71° 77° 4980 3696 2453 1548 1070
06-30 69° 81° 5033 3739 2486 1573 1090
07-01 65° 84° 5085 3781 2518 1597 1109
07-02 65° 86° 5139 3825 2552 1622 1130
07-03 67° 89° 5195 3871 2588 1650 1152
07-04 68° 89° 5251 3917 2624 1679 1176
07-05 72° 87° 5309 3965 2662 1709 1201
07-06 70° 84° 5364 4010 2697 1736 1223
07-07 68° 86° 5419 4055 2732 1763 1245
07-08 69° 83° 5473 4099 2766 1789 1266
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 69° 87° 5529 4145 2802 1816 1289
07-10 68° 89° 5585 4192 2839 1845 1312
07-11 71° 92° 5645 4241 2878 1877 1339
07-12 68° 83° 5699 4285 2912 1902 1360
07-13 72° 81° 5753 4329 2946 1929 1381
07-14 67° 86° 5807 4373 2980 1955 1402
07-15 70° 87° 5864 4420 3017 1983 1426
07-16 72° 90° 5923 4469 3056 2015 1452
07-17 71° 82° 5978 4514 3091 2041 1473
07-18 70° 86° 6034 4560 3127 2069 1497
07-19 74° 89° 6093 4609 3166 2101 1523
07-20 75° 90° 6154 4660 3207 2133 1551
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 69° 83° 6208 4704 3241 2160 1572
07-22 75° 91° 6269 4755 3282 2192 1600
07-23 74° 92° 6330 4806 3323 2225 1627
07-24 71° 91° 6389 4855 3362 2256 1653
07-25 70° 90° 6447 4903 3400 2287 1679
07-26 75° 89° 6507 4954 3441 2319 1706
07-27 75° 92° 6569 5005 3482 2353 1735
07-28 76° 91° 6631 5057 3524 2386 1764
07-29 75° 92° 6693 5109 3566 2420 1792
07-30 73° 86° 6750 5156 3603 2450 1817
07-31 68° 76° 6800 5196 3633 2472 1834
08-01 60° 78° 6847 5233 3660 2491 1848
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 59° 77° 6893 5269 3686 2509 1861
08-03 55° 76° 6937 5303 3710 2525 1872
08-04 58° 81° 6984 5341 3738 2544 1886
08-05 61° 83° 7035 5381 3768 2566 1904
08-06 67° 88° 7090 5426 3803 2594 1926
08-07 71° 85° 7146 5472 3839 2622 1949
08-08 72° 94° 7207 5523 3880 2655 1977
08-09 75° 91° 7268 5574 3921 2688 2005
08-10 73° 84° 7325 5621 3958 2716 2028
08-11 71° 88° 7382 5668 3995 2745 2052
08-12 68° 85° 7436 5712 4029 2772 2074
08-13 68° 87° 7492 5758 4065 2799 2097
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 66° 88° 7547 5803 4100 2826 2119
08-15 70° 96° 7608 5854 4141 2859 2147
08-16 74° 95° 7670 5907 4184 2894 2176
08-17 74° 94° 7733 5959 4226 2928 2205
08-18 72° 95° 7794 6010 4267 2962 2234
08-19 73° 91° 7855 6061 4308 2994 2261
08-20 69° 87° 7911 6107 4344 3022 2285
08-21 66° 82° 7962 6149 4376 3046 2303
08-22 59° 84° 8012 6188 4405 3067 2320
08-23 63° 84° 8063 6229 4436 3091 2338
08-24 54° 77° 8107 6263 4460 3107 2349
08-25 51° 72° 8146 6292 4479 3118 2355
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 48° 78° 8187 6323 4500 3131 2363
08-27 51° 81° 8231 6357 4524 3146 2374
08-28 55° 82° 8277 6394 4551 3165 2387
08-29 55° 86° 8326 6432 4579 3186 2403
08-30 60° 87° 8378 6474 4611 3209 2421
08-31 67° 77° 8428 6514 4641 3231 2438
09-01 62° 78° 8476 6552 4669 3251 2453
09-02 63° 80° 8525 6591 4698 3273 2470
09-03 60° 84° 8575 6631 4728 3295 2487
09-04 52° 73° 8616 6662 4749 3307 2495
09-05 55° 68° 8655 6691 4768 3319 2501
09-06 46° 75° 8694 6720 4787 3329 2507
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 43° 74° 8731 6747 4804 3338 2511
09-08 49° 78° 8772 6778 4825 3352 2519
09-09 56° 81° 8819 6815 4852 3370 2533
09-10 61° 86° 8870 6857 4884 3394 2551
09-11 63° 91° 8925 6901 4918 3421 2573
09-12 65° 95° 8983 6949 4956 3451 2598
09-13 66° 96° 9042 6998 4995 3482 2624
09-14 68° 94° 9101 7047 5034 3513 2650
09-15 69° 91° 9159 7095 5072 3543 2675
09-16 64° 91° 9215 7141 5108 3570 2697
09-17 64° 91° 9270 7186 5143 3598 2720
09-18 64° 86° 9323 7229 5176 3623 2740
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 60° 81° 9372 7268 5205 3644 2756
09-20 62° 86° 9424 7310 5237 3668 2775
09-21 65° 84° 9477 7353 5270 3692 2795
09-22 61° 81° 9526 7392 5299 3713 2811
09-23 65° 69° 9571 7427 5324 3731 2823
09-24 64° 72° 9617 7463 5350 3749 2836
09-25 56° 79° 9663 7499 5376 3766 2848
09-26 54° 82° 9709 7535 5402 3784 2862
09-27 55° 83° 9756 7572 5429 3803 2876
09-28 58° 86° 9806 7612 5459 3825 2892
09-29 58° 85° 9855 7651 5488 3847 2909
09-30 58° 87° 9905 7692 5519 3869 2926
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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