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Black Turfgrass Ataenius Egg Laying (GDD 50)
through Mon, Apr. 27. 2026

 

GDD Total: 278 (Base 50) through Mon, Apr. 27, 2026

  

Downers Grove, IL

        

Forecast »

“Flashback” to 2025

4/25

4/26

4/27

4/28

4/29

4/30

5/1

5/2

5/3

5/4

5/5

5/6

5/7

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 28° 62° 24 14 4 0 0
02-16 35° 66° 52 32 12 1 0
02-17 41° 59° 81 51 21 1 0
02-18 48° 63° 114 74 34 7 0
02-19 39° 58° 141 91 41 7 0
02-20 25° 47° 155 95 41 7 0
02-21 25° 29° 160 95 41 7 0
02-22 20° 27° 162 95 41 7 0
02-23 19° 30° 164 95 41 7 0
02-24 20° 39° 171 95 41 7 0
02-25 26° 37° 181 95 41 7 0
02-26 22° 42° 191 95 41 7 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 28° 65° 215 109 45 7 0
02-28 27° 48° 230 115 45 7 0
03-01 24° 33° 237 115 45 7 0
03-02 24° 45° 249 117 45 7 0
03-03 34° 43° 266 123 45 7 0
03-04 33° 45° 283 131 45 7 0
03-05 40° 52° 306 144 49 7 0
03-06 44° 68° 340 168 63 13 1
03-07 39° 64° 370 188 72 14 1
03-08 33° 63° 396 204 78 14 1
03-09 47° 73° 434 232 97 24 6
03-10 39° 61° 462 250 105 24 6
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 33° 48° 481 259 105 24 6
03-12 29° 45° 496 264 105 24 6
03-13 37° 47° 516 273 105 24 6
03-14 29° 36° 526 274 105 24 6
03-15 33° 62° 552 290 111 24 6
03-16 20° 32° 556 290 111 24 6
03-17 14° 24° 556 290 111 24 6
03-18 23° 47° 570 294 111 24 6
03-19 35° 65° 598 312 119 25 6
03-20 43° 74° 634 338 135 33 10
03-21 42° 72° 669 363 150 39 11
03-22 32° 70° 698 382 159 41 11
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 30° 44° 713 387 159 41 11
03-24 27° 53° 731 395 159 41 11
03-25 41° 72° 766 419 174 48 13
03-26 35° 72° 797 441 186 51 13
03-27 31° 44° 813 447 186 51 13
03-28 26° 49° 828 452 186 51 13
03-29 41° 64° 859 473 196 54 13
03-30 50° 81° 903 506 220 70 24
03-31 42° 69° 936 530 233 75 25
04-01 36° 42° 953 537 233 75 25
04-02 39° 70° 986 559 246 80 25
04-03 39° 63° 1015 578 255 81 25
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 39° 55° 1040 593 260 81 25
04-05 36° 52° 1062 606 262 81 25
04-06 38° 51° 1084 618 265 81 25
04-07 28° 40° 1096 620 265 81 25
04-08 33° 72° 1126 640 275 83 25
04-09 56° 71° 1168 672 296 96 33
04-10 43° 58° 1197 690 305 97 33
04-11 34° 57° 1220 704 309 97 33
04-12 55° 80° 1265 739 334 115 45
04-13 62° 78° 1313 777 362 135 60
04-14 58° 81° 1361 815 390 154 75
04-15 64° 73° 1408 851 416 173 88
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 53° 72° 1448 882 437 185 96
04-17 49° 82° 1492 916 461 201 107
04-18 43° 63° 1523 937 472 204 107
04-19 35° 49° 1543 947 472 204 107
04-20 32° 57° 1566 960 475 204 107
04-21 50° 75° 1607 990 495 217 115
04-22 54° 73° 1648 1022 517 230 123
04-23 51° 81° 1692 1056 541 246 134
04-24 64° 72° 1738 1092 567 264 147
04-25 46° 62° 1770 1113 578 268 147
04-26 43° 62° 1800 1134 589 270 147
04-27 48° 67° 1836 1159 604 278 150
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 51° 64° 1871 1185 620 286 152
04-29 44° 58° 1900 1204 629 287 152
04-30 37° 56° 1925 1219 634 287 152
05-01 39° 49° 1947 1231 636 287 152
05-02 34° 54° 1969 1243 638 287 152
05-03 41° 65° 2000 1264 649 290 152
05-04 47° 74° 2039 1292 667 300 158
05-05 49° 59° 2070 1314 679 304 158
05-06 43° 58° 2099 1333 688 304 158
05-07 41° 58° 2126 1350 695 304 158
05-08 41° 64° 2157 1371 706 307 158
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 23° 34° 7 0 0 0 0
02-16 12° 28° 7 0 0 0 0
02-17 0° 10° 7 0 0 0 0
02-18 -7° 14° 7 0 0 0 0
02-19 4° 16° 7 0 0 0 0
02-20 2° 24° 7 0 0 0 0
02-21 9° 28° 7 0 0 0 0
02-22 13° 35° 9 0 0 0 0
02-23 22° 46° 21 2 0 0 0
02-24 39° 55° 46 17 5 0 0
02-25 37° 55° 70 31 9 0 0
02-26 35° 52° 91 42 10 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 35° 49° 111 52 10 0 0
02-28 33° 57° 134 65 13 0 0
03-01 21° 37° 141 65 13 0 0
03-02 16° 37° 145 65 13 0 0
03-03 27° 47° 161 70 13 0 0
03-04 44° 48° 184 84 17 0 0
03-05 29° 50° 202 91 17 0 0
03-06 28° 40° 214 93 17 0 0
03-07 32° 37° 226 96 17 0 0
03-08 29° 49° 243 103 17 0 0
03-09 32° 58° 266 116 20 0 0
03-10 37° 69° 297 137 31 3 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 36° 58° 322 152 36 3 0
03-12 35° 55° 345 165 39 3 0
03-13 32° 63° 371 181 44 3 0
03-14 46° 79° 412 211 65 16 8
03-15 45° 69° 446 236 80 22 9
03-16 30° 43° 461 241 80 22 9
03-17 26° 53° 478 248 80 22 9
03-18 44° 73° 515 275 97 31 13
03-19 39° 56° 541 290 102 31 13
03-20 30° 43° 555 295 102 31 13
03-21 30° 60° 578 308 105 31 13
03-22 35° 52° 600 320 107 31 13
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 35° 50° 620 330 107 31 13
03-24 34° 49° 640 339 107 31 13
03-25 30° 51° 658 348 107 31 13
03-26 29° 53° 678 357 107 31 13
03-27 42° 53° 703 373 113 31 13
03-28 48° 79° 745 405 134 45 22
03-29 54° 70° 785 434 154 57 29
03-30 46° 75° 823 462 172 67 34
03-31 35° 47° 842 471 172 67 34
04-01 30° 46° 858 477 172 67 34
04-02 40° 70° 891 501 186 72 34
04-03 43° 62° 922 521 196 75 34
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 38° 48° 943 532 197 75 34
04-05 41° 53° 968 547 202 75 34
04-06 34° 50° 988 557 202 75 34
04-07 30° 44° 1003 562 202 75 34
04-08 25° 44° 1015 565 202 75 34
04-09 32° 42° 1030 570 202 75 34
04-10 38° 45° 1050 579 202 75 34
04-11 35° 53° 1072 591 204 75 34
04-12 34° 62° 1097 607 210 75 34
04-13 52° 65° 1134 633 226 83 37
04-14 53° 64° 1170 660 243 91 41
04-15 39° 55° 1195 675 248 91 41
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 33° 53° 1216 686 249 91 41
04-17 38° 64° 1246 705 258 93 41
04-18 57° 77° 1291 741 284 110 53
04-19 45° 67° 1325 764 297 116 54
04-20 47° 61° 1357 786 309 120 54
04-21 48° 61° 1389 809 322 124 54
04-22 40° 74° 1424 834 337 132 56
04-23 57° 78° 1470 869 362 149 69
04-24 53° 78° 1514 903 386 165 79
04-25 50° 60° 1547 926 399 170 79
04-26 43° 54° 1573 943 406 170 79
04-27 36° 70° 1604 964 417 173 79
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 53° 84° 1651 1000 443 191 93
04-29 54° 75° 1693 1033 466 206 103
04-30 46° 63° 1726 1055 478 211 103
05-01 52° 68° 1764 1084 497 221 108
05-02 47° 59° 1795 1104 507 223 108
05-03 44° 56° 1822 1122 515 223 108
05-04 46° 58° 1852 1142 525 225 108
05-05 48° 60° 1884 1164 537 229 108
05-06 46° 78° 1924 1194 557 241 115
05-07 50° 75° 1965 1225 578 254 122
05-08 46° 58° 1995 1245 588 256 122
05-09 38° 67° 2026 1265 598 259 122
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 47° 74° 2064 1294 617 269 128
05-11 43° 73° 2100 1320 633 277 131
05-12 50° 80° 2144 1353 656 293 141
05-13 63° 79° 2193 1392 685 314 158
05-14 58° 81° 2240 1430 713 333 172
05-15 62° 94° 2296 1476 749 361 195
05-16 62° 86° 2349 1518 781 386 215
05-17 53° 70° 2388 1548 801 397 221
05-18 47° 66° 2423 1572 815 404 223
05-19 44° 53° 2449 1589 822 404 223
05-20 50° 57° 2481 1611 834 408 223
05-21 49° 54° 2511 1630 843 409 223
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 48° 57° 2541 1651 854 411 223
05-23 42° 65° 2573 1672 865 415 223
05-24 43° 66° 2605 1695 878 420 223
05-25 52° 66° 2642 1722 895 429 227
05-26 44° 68° 2677 1746 909 435 228
05-27 52° 69° 2715 1775 928 445 233
05-28 55° 63° 2752 1802 945 455 238
05-29 53° 72° 2793 1832 965 467 245
05-30 52° 75° 2834 1863 986 480 253
05-31 51° 66° 2871 1890 1003 489 257
06-01 43° 70° 2905 1915 1018 495 258
06-02 47° 85° 2949 1949 1042 511 269
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 67° 86° 3004 1993 1076 538 291
06-04 58° 73° 3047 2027 1100 554 302
06-05 54° 71° 3088 2058 1121 566 309
06-06 60° 78° 3135 2095 1148 585 323
06-07 56° 78° 3181 2130 1173 603 336
06-08 59° 80° 3228 2168 1201 622 350
06-09 55° 71° 3269 2198 1221 635 358
06-10 54° 78° 3313 2232 1245 651 369
06-11 63° 91° 3368 2278 1281 678 391
06-12 65° 83° 3420 2320 1313 702 410
06-13 62° 72° 3465 2355 1338 719 422
06-14 61° 76° 3511 2391 1364 738 436
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 58° 82° 3559 2429 1392 757 450
06-16 61° 89° 3612 2472 1425 782 470
06-17 72° 91° 3672 2521 1464 814 497
06-18 68° 82° 3724 2564 1497 838 516
06-19 66° 83° 3777 2606 1529 863 536
06-20 68° 85° 3831 2651 1564 889 557
06-21 77° 94° 3895 2704 1607 925 588
06-22 79° 94° 3959 2759 1652 962 620
06-23 78° 95° 4024 2814 1697 998 651
06-24 77° 93° 4087 2867 1740 1033 681
06-25 73° 88° 4146 2915 1778 1064 707
06-26 76° 94° 4209 2968 1821 1099 737
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 76° 87° 4268 3018 1861 1131 764
06-28 68° 89° 4325 3064 1897 1159 787
06-29 72° 91° 4384 3114 1937 1191 814
06-30 74° 89° 4444 3164 1977 1222 840
07-01 70° 86° 4501 3210 2013 1251 864
07-02 69° 89° 4558 3258 2051 1280 888
07-03 70° 92° 4617 3307 2090 1311 914
07-04 75° 90° 4678 3357 2130 1344 942
07-05 74° 93° 4739 3408 2171 1377 970
07-06 69° 85° 4794 3454 2207 1404 992
07-07 65° 84° 4847 3497 2240 1429 1012
07-08 67° 85° 4901 3541 2274 1456 1034
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 70° 83° 4956 3585 2308 1482 1055
07-10 67° 86° 5010 3629 2342 1508 1076
07-11 70° 89° 5067 3677 2380 1538 1101
07-12 69° 82° 5121 3721 2414 1563 1121
07-13 67° 81° 5173 3763 2446 1588 1141
07-14 62° 87° 5226 3806 2479 1612 1160
07-15 68° 91° 5284 3853 2516 1642 1185
07-16 74° 90° 5343 3903 2556 1674 1212
07-17 64° 76° 5391 3941 2584 1693 1226
07-18 57° 83° 5439 3979 2612 1714 1242
07-19 73° 83° 5495 4025 2648 1741 1264
07-20 67° 76° 5545 4064 2677 1763 1281
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 63° 84° 5596 4106 2709 1786 1299
07-22 67° 87° 5651 4151 2744 1813 1321
07-23 72° 93° 5711 4201 2784 1846 1349
07-24 72° 93° 5772 4252 2825 1878 1376
07-25 75° 82° 5829 4298 2861 1907 1400
07-26 72° 83° 5884 4344 2897 1934 1422
07-27 74° 88° 5943 4393 2936 1965 1448
07-28 77° 89° 6004 4444 2977 1999 1477
07-29 71° 91° 6064 4493 3016 2030 1503
07-30 70° 82° 6118 4537 3050 2056 1524
07-31 67° 76° 6167 4576 3079 2077 1540
08-01 61° 75° 6213 4613 3106 2095 1553
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 57° 79° 6259 4649 3132 2113 1566
08-03 58° 80° 6306 4685 3158 2132 1580
08-04 62° 82° 6356 4725 3188 2154 1597
08-05 62° 84° 6407 4766 3219 2177 1615
08-06 64° 87° 6460 4810 3253 2202 1635
08-07 71° 90° 6519 4858 3291 2233 1661
08-08 73° 91° 6578 4908 3331 2264 1687
08-09 75° 93° 6640 4960 3373 2298 1716
08-10 77° 88° 6700 5010 3413 2331 1744
08-11 74° 88° 6760 5059 3452 2362 1770
08-12 73° 86° 6817 5106 3489 2391 1794
08-13 69° 84° 6871 5151 3524 2417 1815
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 65° 83° 6923 5193 3556 2441 1834
08-15 66° 90° 6980 5239 3592 2470 1858
08-16 74° 95° 7042 5291 3634 2504 1887
08-17 71° 81° 7096 5335 3668 2530 1908
08-18 72° 84° 7152 5381 3704 2558 1931
08-19 71° 77° 7204 5423 3736 2582 1950
08-20 66° 75° 7252 5462 3765 2603 1966
08-21 63° 74° 7299 5499 3792 2621 1979
08-22 63° 79° 7348 5538 3821 2642 1995
08-23 66° 82° 7400 5580 3853 2666 2014
08-24 56° 71° 7442 5612 3875 2680 2023
08-25 53° 68° 7481 5640 3893 2691 2029
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 50° 72° 7520 5670 3913 2702 2035
08-27 52° 75° 7561 5701 3934 2715 2043
08-28 61° 76° 7608 5737 3960 2734 2057
08-29 53° 70° 7648 5767 3980 2746 2064
08-30 60° 72° 7692 5801 4004 2762 2075
08-31 53° 76° 7734 5834 4027 2776 2084
09-01 56° 77° 7778 5868 4051 2793 2096
09-02 55° 80° 7824 5904 4077 2810 2108
09-03 58° 71° 7867 5936 4099 2825 2118
09-04 48° 66° 7901 5961 4114 2832 2120
09-05 56° 66° 7940 5990 4133 2842 2125
09-06 46° 66° 7974 6014 4147 2849 2127
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 44° 67° 8008 6037 4160 2854 2127
09-08 45° 72° 8044 6064 4177 2862 2130
09-09 47° 75° 8083 6093 4196 2874 2137
09-10 59° 82° 8132 6131 4224 2894 2152
09-11 62° 80° 8181 6171 4254 2915 2168
09-12 58° 84° 8230 6210 4283 2936 2184
09-13 64° 77° 8278 6248 4311 2957 2200
09-14 64° 83° 8329 6289 4342 2980 2218
09-15 61° 85° 8380 6330 4373 3003 2236
09-16 59° 83° 8430 6369 4402 3024 2252
09-17 57° 83° 8478 6407 4430 3044 2267
09-18 59° 87° 8529 6448 4461 3067 2285
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 64° 89° 8583 6493 4496 3093 2306
09-20 66° 77° 8632 6532 4525 3115 2323
09-21 66° 81° 8684 6574 4557 3138 2341
09-22 65° 81° 8735 6615 4588 3161 2359
09-23 66° 78° 8785 6655 4618 3183 2376
09-24 62° 72° 8830 6690 4643 3200 2388
09-25 58° 75° 8874 6724 4667 3217 2400
09-26 55° 83° 8922 6761 4694 3236 2414
09-27 59° 87° 8973 6802 4725 3259 2432
09-28 60° 81° 9021 6840 4753 3279 2447
09-29 58° 89° 9072 6882 4785 3303 2466
09-30 60° 83° 9122 6922 4815 3324 2482
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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