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)
forecast for Mon, May. 25. 2026

 

Forecasted GDD Total: 670 (Base 50) through Mon, May. 25, 2026

  

Mount Laurel, NJ

        

Forecast »

“Flashback” to 2025

5/16

5/17

5/18

5/19

5/20

5/21

5/22

5/23

5/24

5/25

5/26

5/27

5/28

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 27° 44° 14 4 0 0 0
02-16 31° 39° 27 7 0 0 0
02-17 32° 41° 41 11 0 0 0
02-18 33° 45° 58 18 0 0 0
02-19 37° 44° 76 26 0 0 0
02-20 38° 46° 96 36 0 0 0
02-21 35° 48° 116 46 0 0 0
02-22 30° 40° 129 49 0 0 0
02-23 30° 36° 140 50 0 0 0
02-24 19° 31° 143 50 0 0 0
02-25 22° 43° 153 50 0 0 0
02-26 30° 45° 169 56 0 0 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 29° 48° 185 62 0 0 0
02-28 27° 56° 205 72 0 0 0
03-01 32° 44° 221 78 0 0 0
03-02 25° 33° 228 78 0 0 0
03-03 32° 41° 242 82 0 0 0
03-04 40° 47° 264 94 2 0 0
03-05 42° 45° 285 105 3 0 0
03-06 38° 43° 304 114 3 0 0
03-07 38° 52° 327 127 6 0 0
03-08 49° 70° 364 154 23 10 5
03-09 38° 73° 398 178 37 15 5
03-10 43° 82° 438 208 57 27 12
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 53° 80° 483 243 82 44 24
03-12 34° 65° 510 260 89 44 24
03-13 29° 46° 526 266 89 44 24
03-14 34° 55° 548 278 92 44 24
03-15 36° 48° 568 288 92 44 24
03-16 50° 67° 605 315 108 52 27
03-17 32° 46° 622 322 108 52 27
03-18 26° 37° 631 322 108 52 27
03-19 31° 48° 648 329 108 52 27
03-20 34° 64° 675 346 115 52 27
03-21 45° 61° 706 367 126 55 27
03-22 43° 72° 742 392 142 63 30
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 37° 55° 766 406 146 63 30
03-24 31° 49° 784 414 146 63 30
03-25 34° 56° 807 427 149 63 30
03-26 46° 77° 846 457 168 74 36
03-27 41° 69° 879 480 182 80 37
03-28 32° 45° 896 486 182 80 37
03-29 28° 57° 916 497 182 80 37
03-30 45° 70° 952 522 198 87 39
03-31 61° 79° 1000 560 225 107 54
04-01 63° 82° 1050 600 256 129 71
04-02 42° 59° 1078 619 264 130 71
04-03 42° 69° 1112 643 278 136 72
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 46° 77° 1152 673 298 148 79
04-05 46° 71° 1188 699 314 156 82
04-06 41° 58° 1215 716 321 156 82
04-07 40° 55° 1241 732 327 156 82
04-08 30° 51° 1259 740 327 156 82
04-09 30° 59° 1282 752 329 156 82
04-10 41° 70° 1315 776 343 161 82
04-11 49° 65° 1350 801 358 168 85
04-12 39° 64° 1380 821 367 170 85
04-13 48° 78° 1421 852 388 183 93
04-14 60° 86° 1472 893 419 206 111
04-15 62° 88° 1525 936 453 231 131
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 64° 90° 1580 981 488 258 153
04-17 67° 82° 1632 1023 520 282 172
04-18 51° 70° 1671 1052 539 293 178
04-19 42° 53° 1696 1067 544 293 178
04-20 35° 53° 1718 1079 546 293 178
04-21 31° 55° 1739 1090 547 293 178
04-22 46° 62° 1771 1112 558 297 178
04-23 45° 77° 1810 1140 577 307 184
04-24 50° 73° 1849 1170 597 319 190
04-25 44° 50° 1874 1185 602 319 190
04-26 43° 57° 1902 1203 610 319 190
04-27 38° 69° 1934 1224 621 323 190
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 39° 63° 1963 1244 631 324 190
04-29 50° 66° 1999 1269 646 332 193
04-30 48° 64° 2033 1294 661 338 194
05-01 44° 65° 2066 1316 673 342 194
05-02 50° 62° 2099 1340 687 348 195
05-03 44° 61° 2130 1360 697 351 195
05-04 46° 73° 2167 1388 715 360 199
05-05 60° 84° 2217 1428 744 382 216
05-06 63° 72° 2263 1463 770 399 229
05-07 51° 67° 2299 1490 787 408 233
05-08 47° 68° 2335 1515 802 416 235
05-09 53° 68° 2374 1544 821 426 241
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 50° 78° 2416 1576 843 441 250
05-11 48° 62° 2449 1599 856 446 250
05-12 43° 68° 2482 1623 870 451 251
05-13 52° 75° 2524 1655 891 465 259
05-14 54° 66° 2562 1682 909 475 264
05-15 51° 66° 2599 1709 926 484 268
05-16 47° 83° 2642 1742 949 498 278
05-17 63° 88° 2695 1786 983 524 298
05-18 62° 95° 2752 1832 1019 553 322
05-19 70° 95° 2812 1883 1060 585 350
05-20 71° 93° 2872 1933 1100 617 377
05-21 58° 70° 2914 1965 1122 631 386
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 54° 66° 2952 1993 1140 641 391
05-23 48° 56° 2982 2013 1150 643 391
05-24 51° 69° 3020 2041 1168 653 396
05-25 59° 75° 3065 2076 1193 670 408
05-26 60° 80° 3113 2114 1221 690 423
05-27 60° 83° 3163 2153 1250 712 439
05-28 60° 80° 3211 2192 1279 732 454
05-29 57° 77° 3256 2227 1303 749 466
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 26° 38° 10 0 0 0 0
02-16 35° 58° 34 14 4 0 0
02-17 30° 37° 46 16 4 0 0
02-18 20° 29° 49 16 4 0 0
02-19 17° 29° 49 16 4 0 0
02-20 17° 28° 50 16 4 0 0
02-21 21° 36° 56 16 4 0 0
02-22 21° 41° 65 16 4 0 0
02-23 28° 48° 81 22 4 0 0
02-24 29° 54° 101 31 4 0 0
02-25 38° 60° 128 48 11 0 0
02-26 37° 61° 155 65 18 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 44° 54° 182 83 26 0 0
02-28 38° 52° 205 95 29 0 0
03-01 31° 65° 231 111 34 0 0
03-02 20° 36° 237 111 34 0 0
03-03 21° 40° 245 111 34 0 0
03-04 26° 61° 267 123 36 0 0
03-05 46° 62° 299 145 48 4 0
03-06 37° 57° 324 160 53 4 0
03-07 34° 52° 345 171 54 4 0
03-08 36° 49° 366 182 55 4 0
03-09 29° 55° 386 192 55 4 0
03-10 38° 66° 417 212 66 7 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 34° 68° 446 231 75 8 0
03-12 41° 59° 474 249 83 8 0
03-13 35° 52° 495 261 84 8 0
03-14 41° 59° 523 279 92 8 0
03-15 41° 54° 549 295 98 8 0
03-16 48° 69° 586 322 115 17 4
03-17 39° 63° 615 341 124 18 4
03-18 32° 63° 641 357 130 18 4
03-19 35° 69° 671 377 140 20 4
03-20 44° 66° 704 400 153 25 4
03-21 40° 54° 729 415 158 25 4
03-22 37° 63° 757 433 166 25 4
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 32° 49° 776 442 166 25 4
03-24 39° 53° 800 456 171 25 4
03-25 43° 61° 831 477 181 28 4
03-26 39° 50° 853 489 184 28 4
03-27 31° 53° 873 499 184 28 4
03-28 39° 64° 903 518 193 29 4
03-29 50° 80° 945 551 216 44 14
03-30 45° 67° 979 575 230 50 15
03-31 52° 79° 1023 609 254 66 26
04-01 43° 62° 1053 629 264 68 26
04-02 33° 53° 1074 640 265 68 26
04-03 46° 76° 1113 669 284 79 32
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 59° 71° 1156 702 307 94 42
04-05 48° 60° 1188 724 319 98 42
04-06 46° 54° 1217 743 327 99 42
04-07 41° 51° 1241 757 332 99 42
04-08 38° 46° 1261 767 332 99 42
04-09 31° 50° 1279 775 332 99 42
04-10 38° 53° 1303 788 335 99 42
04-11 41° 46° 1324 800 337 99 42
04-12 38° 42° 1342 808 337 99 42
04-13 40° 58° 1370 826 344 99 42
04-14 40° 67° 1401 847 356 102 42
04-15 50° 69° 1439 875 373 112 47
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 45° 55° 1467 893 381 112 47
04-17 38° 62° 1495 911 390 112 47
04-18 37° 71° 1527 933 402 116 47
04-19 64° 80° 1577 973 432 138 64
04-20 54° 72° 1618 1004 453 151 72
04-21 48° 64° 1652 1028 467 157 72
04-22 55° 78° 1697 1062 491 173 84
04-23 54° 75° 1739 1095 514 188 93
04-24 48° 78° 1780 1126 534 201 101
04-25 50° 78° 1822 1157 556 214 110
04-26 56° 73° 1864 1190 579 229 120
04-27 48° 69° 1901 1216 595 237 123
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 45° 74° 1938 1244 613 247 128
04-29 48° 80° 1981 1276 635 261 137
04-30 62° 78° 2029 1315 663 282 152
05-01 49° 77° 2070 1346 685 295 161
05-02 59° 83° 2119 1385 714 316 176
05-03 63° 83° 2170 1426 744 339 194
05-04 63° 70° 2215 1461 769 356 206
05-05 61° 69° 2258 1493 792 370 216
05-06 61° 78° 2305 1531 820 390 231
05-07 59° 74° 2350 1566 844 407 242
05-08 56° 78° 2395 1601 870 424 255
05-09 52° 66° 2432 1628 887 433 259
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 49° 74° 2471 1657 906 444 265
05-11 51° 81° 2515 1691 930 460 276
05-12 52° 82° 2560 1726 955 477 288
05-13 62° 69° 2603 1759 978 492 298
05-14 59° 66° 2644 1790 998 505 305
05-15 62° 72° 2689 1825 1023 522 317
05-16 62° 75° 2735 1861 1050 540 331
05-17 62° 82° 2785 1901 1079 562 347
05-18 61° 75° 2831 1937 1106 580 361
05-19 59° 70° 2874 1970 1129 595 371
05-20 47° 66° 2909 1995 1144 602 372
05-21 51° 55° 2940 2016 1155 605 372
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 51° 55° 2971 2037 1166 608 372
05-23 50° 66° 3007 2063 1182 616 375
05-24 49° 64° 3042 2088 1196 623 377
05-25 50° 69° 3079 2115 1214 632 381
05-26 49° 71° 3118 2144 1232 643 387
05-27 50° 72° 3157 2173 1252 654 393
05-28 54° 58° 3191 2197 1265 660 394
05-29 57° 71° 3233 2229 1288 674 403
05-30 61° 77° 3280 2266 1314 693 417
05-31 55° 72° 3322 2298 1336 707 426
06-01 50° 68° 3359 2325 1353 716 430
06-02 49° 73° 3397 2353 1372 726 435
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 53° 81° 3442 2388 1397 743 447
06-04 55° 86° 3491 2427 1425 764 463
06-05 64° 85° 3543 2469 1458 788 482
06-06 65° 85° 3596 2512 1491 813 503
06-07 67° 80° 3648 2554 1522 837 521
06-08 63° 71° 3693 2589 1547 854 533
06-09 62° 71° 3737 2623 1571 870 544
06-10 63° 81° 3787 2663 1601 892 561
06-11 66° 83° 3839 2705 1634 916 580
06-12 65° 90° 3894 2750 1669 943 603
06-13 70° 80° 3947 2793 1702 968 622
06-14 61° 69° 3991 2826 1725 983 633
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 58° 62° 4029 2855 1743 994 638
06-16 60° 65° 4069 2885 1764 1006 646
06-17 61° 75° 4116 2922 1790 1025 659
06-18 68° 84° 4170 2966 1825 1051 680
06-19 71° 90° 4229 3015 1863 1082 706
06-20 66° 84° 4282 3057 1896 1106 726
06-21 70° 89° 4339 3105 1934 1136 750
06-22 74° 86° 4397 3153 1972 1166 775
06-23 77° 99° 4463 3209 2018 1204 808
06-24 79° 100° 4530 3266 2065 1243 843
06-25 79° 98° 4597 3323 2112 1282 876
06-26 66° 86° 4651 3367 2145 1308 897
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 64° 69° 4695 3401 2170 1324 908
06-28 63° 87° 4748 3444 2203 1349 928
06-29 75° 92° 4810 3496 2244 1383 957
06-30 76° 90° 4871 3546 2285 1415 985
07-01 74° 89° 4930 3596 2324 1447 1011
07-02 72° 84° 4985 3641 2360 1474 1034
07-03 70° 90° 5043 3689 2398 1504 1058
07-04 64° 84° 5095 3731 2430 1528 1077
07-05 62° 87° 5147 3773 2462 1552 1097
07-06 66° 89° 5203 3819 2498 1580 1119
07-07 74° 89° 5262 3868 2537 1611 1146
07-08 74° 95° 5325 3921 2579 1646 1175
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 73° 89° 5384 3970 2619 1677 1201
07-10 69° 82° 5438 4013 2652 1702 1222
07-11 72° 87° 5495 4061 2690 1732 1246
07-12 73° 88° 5553 4109 2728 1762 1272
07-13 74° 86° 5612 4158 2766 1793 1297
07-14 74° 89° 5671 4207 2805 1824 1323
07-15 73° 87° 5729 4254 2843 1853 1348
07-16 74° 90° 5789 4305 2883 1886 1375
07-17 73° 92° 5849 4355 2924 1918 1402
07-18 74° 85° 5907 4403 2961 1948 1427
07-19 72° 79° 5960 4446 2995 1973 1447
07-20 74° 87° 6019 4495 3034 2004 1473
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 71° 87° 6076 4542 3070 2033 1497
07-22 66° 83° 6128 4584 3103 2057 1516
07-23 65° 83° 6181 4626 3135 2081 1536
07-24 64° 88° 6235 4670 3169 2107 1557
07-25 73° 95° 6297 4723 3211 2142 1586
07-26 75° 86° 6355 4771 3249 2172 1611
07-27 72° 89° 6413 4819 3287 2202 1636
07-28 74° 94° 6475 4870 3329 2235 1665
07-29 76° 97° 6539 4925 3373 2272 1696
07-30 76° 95° 6602 4978 3417 2307 1726
07-31 70° 92° 6662 5027 3456 2338 1753
08-01 65° 72° 6708 5064 3483 2357 1766
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 60° 79° 6756 5102 3511 2377 1781
08-03 59° 82° 6804 5140 3539 2397 1797
08-04 59° 87° 6855 5181 3570 2420 1815
08-05 64° 83° 6907 5223 3602 2444 1833
08-06 70° 79° 6959 5265 3634 2468 1852
08-07 66° 81° 7011 5307 3665 2492 1871
08-08 58° 81° 7058 5344 3693 2511 1886
08-09 55° 83° 7106 5382 3720 2531 1900
08-10 58° 87° 7156 5422 3751 2553 1917
08-11 60° 88° 7208 5464 3783 2577 1937
08-12 67° 89° 7264 5510 3819 2605 1959
08-13 71° 90° 7323 5559 3858 2636 1985
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 73° 87° 7382 5607 3896 2666 2011
08-15 72° 88° 7440 5655 3934 2696 2036
08-16 71° 87° 7497 5703 3971 2726 2060
08-17 70° 91° 7555 5751 4010 2756 2086
08-18 66° 75° 7604 5790 4039 2777 2101
08-19 65° 75° 7652 5828 4067 2797 2116
08-20 65° 72° 7699 5865 4094 2816 2130
08-21 62° 72° 7744 5900 4119 2833 2142
08-22 59° 81° 7792 5938 4147 2853 2157
08-23 57° 82° 7840 5976 4175 2873 2172
08-24 60° 83° 7890 6016 4204 2895 2189
08-25 67° 85° 7944 6060 4239 2921 2210
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 58° 79° 7991 6097 4265 2940 2224
08-27 59° 76° 8036 6132 4290 2957 2236
08-28 54° 79° 8080 6166 4315 2973 2247
08-29 60° 79° 8128 6203 4342 2992 2262
08-30 53° 75° 8170 6236 4364 3007 2271
08-31 52° 77° 8212 6268 4387 3021 2280
09-01 55° 78° 8257 6303 4411 3038 2292
09-02 55° 77° 8301 6337 4436 3054 2303
09-03 55° 79° 8346 6372 4460 3071 2315
09-04 58° 83° 8394 6410 4489 3091 2330
09-05 66° 87° 8449 6455 4523 3118 2352
09-06 71° 88° 8506 6502 4561 3147 2376
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 61° 71° 8550 6536 4585 3163 2387
09-08 53° 74° 8592 6568 4607 3177 2396
09-09 52° 71° 8632 6598 4627 3189 2403
09-10 63° 69° 8676 6632 4651 3205 2414
09-11 59° 81° 8724 6670 4679 3225 2429
09-12 56° 79° 8770 6706 4705 3243 2442
09-13 60° 81° 8818 6744 4733 3263 2457
09-14 61° 82° 8868 6784 4762 3285 2474
09-15 62° 81° 8917 6823 4791 3306 2490
09-16 64° 73° 8963 6859 4818 3324 2503
09-17 64° 68° 9007 6893 4842 3340 2515
09-18 65° 83° 9059 6935 4874 3364 2533
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 63° 87° 9112 6978 4907 3389 2553
09-20 60° 75° 9158 7013 4932 3406 2566
09-21 55° 74° 9200 7046 4954 3421 2575
09-22 51° 76° 9241 7077 4976 3434 2583
09-23 62° 85° 9293 7118 5007 3457 2602
09-24 67° 80° 9344 7160 5039 3481 2620
09-25 71° 81° 9398 7204 5073 3507 2641
09-26 67° 82° 9451 7247 5106 3532 2661
09-27 63° 80° 9501 7287 5135 3554 2678
09-28 64° 84° 9553 7328 5167 3577 2697
09-29 63° 78° 9601 7367 5196 3598 2712
09-30 64° 81° 9651 7407 5226 3620 2730
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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