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Tabular Data

Daily GDD accumulation for various base temperature models in 2014 & 2015

2015Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
02-19 -14° 0 0 0 0 0
02-20 -19° 17° 0 0 0 0 0
02-21 16° 30° 1 0 0 0 0
02-22 26° 1 0 0 0 0
02-23 -9° 10° 1 0 0 0 0
02-24 29° 1 0 0 0 0
02-25 23° 1 0 0 0 0
02-26 -1° 17° 1 0 0 0 0
02-27 -11° 13° 1 0 0 0 0
02-28 -8° 19° 1 0 0 0 0
03-01 16° 24° 1 0 0 0 0
03-02 30° 1 0 0 0 0
2015Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
03-03 24° 33° 8 0 0 0 0
03-04 28° 8 0 0 0 0
03-05 -6° 14° 8 0 0 0 0
03-06 -10° 26° 8 0 0 0 0
03-07 21° 41° 17 0 0 0 0
03-08 19° 38° 23 0 0 0 0
03-09 16° 43° 31 0 0 0 0
03-10 33° 44° 48 7 0 0 0
03-11 30° 53° 67 16 0 0 0
03-12 31° 58° 89 28 2 0 0
03-13 36° 65° 118 47 11 1 0
03-14 42° 60° 147 66 20 2 0
2015Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
03-15 27° 63° 170 79 23 2 0
03-16 46° 72° 208 106 40 11 4
03-17 33° 47° 225 114 40 11 4
03-18 25° 50° 241 120 40 11 4
03-19 36° 51° 262 131 42 11 4
03-20 38° 50° 285 143 44 11 4
03-21 32° 54° 306 154 45 11 4
03-22 28° 37° 316 155 45 11 4
03-23 28° 31° 324 155 45 11 4
03-24 20° 38° 331 155 45 11 4
03-25 34° 41° 346 160 45 11 4
03-26 27° 41° 358 162 45 11 4
2015Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
03-27 22° 33° 364 162 45 11 4
03-28 16° 39° 369 162 45 11 4
03-29 25° 46° 382 166 45 11 4
03-30 33° 63° 408 181 51 11 4
03-31 39° 61° 436 199 59 11 4
04-01 32° 76° 468 221 71 15 4
04-02 51° 65° 504 247 87 23 7
04-03 35° 54° 526 260 89 23 7
04-04 25° 60° 547 270 90 23 7
04-05 40° 68° 579 292 102 27 7
04-06 33° 65° 606 309 109 27 7
04-07 38° 46° 626 319 109 27 7
2015Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
04-08 40° 53° 651 334 114 27 7
04-09 42° 71° 685 358 128 34 9
04-10 40° 60° 713 376 136 34 9
04-11 35° 63° 740 393 143 34 9
04-12 40° 70° 773 416 156 39 9
04-13 53° 66° 810 444 173 48 13
04-14 38° 68° 842 465 185 52 13
04-15 41° 70° 875 488 198 57 13
04-16 48° 68° 911 514 214 65 16
04-17 46° 80° 952 545 235 78 25
04-18 48° 69° 989 572 251 86 28
04-19 49° 74° 1028 602 271 98 35
2015Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
04-20 42° 52° 1053 617 276 98 35
04-21 38° 54° 1077 631 280 98 35
04-22 33° 46° 1095 638 280 98 35
04-23 26° 56° 1114 647 280 98 35
04-24 25° 60° 1135 658 281 98 35
04-25 40° 49° 1157 671 284 98 35
04-26 34° 59° 1182 685 288 98 35
04-27 37° 62° 1209 703 296 98 35
04-28 33° 64° 1236 719 302 98 35
04-29 36° 66° 1265 738 311 99 35
04-30 39° 53° 1288 752 315 99 35
05-01 34° 71° 1319 773 326 102 35
2015Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
05-02 48° 80° 1361 804 347 116 44
05-03 56° 79° 1407 840 373 134 57
05-04 58° 74° 1451 874 397 149 67
05-05 50° 57° 1482 896 409 153 67
05-06 48° 82° 1526 929 432 168 78
05-07 56° 86° 1575 968 461 190 94
05-08 65° 85° 1628 1011 494 214 114
05-09 52° 67° 1665 1038 511 223 118
05-10 47° 56° 1694 1058 521 225 118
05-11 49° 68° 1731 1084 537 233 121
05-12 47° 56° 1760 1104 547 235 121
05-13 39° 58° 1787 1120 553 235 121
2015Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
05-14 42° 70° 1821 1144 567 241 122
05-15 58° 76° 1866 1179 592 258 135
05-16 64° 81° 1917 1220 623 281 153
05-17 67° 79° 1968 1261 654 304 171
05-18 51° 76° 2010 1293 676 318 179
05-19 44° 55° 2038 1311 684 318 179
05-20 40° 52° 2062 1325 688 318 179
05-21 44° 70° 2097 1350 703 325 181
05-22 47° 73° 2135 1378 721 335 186
05-23 45° 84° 2177 1410 743 349 196
05-24 59° 78° 2224 1447 770 368 209
05-25 69° 79° 2276 1489 802 392 228
2015Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
05-26 66° 75° 2324 1528 830 412 244
05-27 65° 75° 2372 1565 858 432 259
05-28 55° 86° 2421 1604 887 453 274
05-29 66° 83° 2474 1647 920 478 294
05-30 47° 74° 2512 1675 938 488 300
05-31 43° 60° 2542 1695 948 490 300
06-01 48° 65° 2576 1719 962 496 301
06-02 41° 75° 2612 1745 978 504 304
06-03 51° 81° 2656 1779 1002 520 315
06-04 61° 84° 2706 1819 1032 542 332
06-05 59° 72° 2749 1853 1056 557 342
06-06 55° 77° 2793 1887 1080 573 353
2015Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
06-07 58° 81° 2841 1924 1107 593 368
06-08 66° 85° 2894 1967 1140 618 388
06-09 59° 88° 2946 2009 1172 642 407
06-10 72° 95° 3007 2060 1213 675 435
06-11 64° 82° 3058 2102 1244 698 453
06-12 59° 69° 3100 2133 1266 712 462
06-13 59° 87° 3151 2174 1297 735 480
06-14 69° 85° 3206 2220 1332 762 502
06-15 70° 82° 3261 2264 1367 789 524
06-16 60° 77° 3307 2301 1393 807 537
06-17 56° 74° 3350 2333 1416 822 547
06-18 64° 81° 3401 2374 1447 845 565
2015Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
06-19 54° 74° 3443 2406 1469 859 574
06-20 54° 81° 3488 2441 1494 876 586
06-21 68° 87° 3544 2487 1530 904 609
06-22 69° 84° 3598 2531 1564 930 630
06-23 66° 83° 3650 2574 1596 954 649
06-24 60° 79° 3698 2611 1624 974 664
06-25 65° 79° 3748 2651 1654 996 681
06-26 59° 70° 3791 2684 1677 1011 691
06-27 57° 79° 3837 2720 1703 1029 704
06-28 51° 80° 3880 2754 1727 1044 714
06-29 62° 76° 3928 2791 1754 1064 729
06-30 60° 79° 3975 2829 1782 1083 743
2015Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
07-01 61° 75° 4021 2865 1808 1101 756
07-02 58° 76° 4066 2900 1833 1118 768
07-03 59° 77° 4112 2935 1858 1136 781
07-04 60° 78° 4159 2972 1885 1155 795
07-05 61° 82° 4209 3012 1915 1177 812
2014Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
02-19 25° 40° 18 1 0 0 0
02-20 32° 44° 34 7 0 0 0
02-21 25° 35° 42 7 0 0 0
02-22 19° 32° 46 7 0 0 0
02-23 12° 25° 46 7 0 0 0
02-24 22° 46 7 0 0 0
02-25 20° 46 7 0 0 0
02-26 -4° 15° 46 7 0 0 0
02-27 -13° 17° 46 7 0 0 0
02-28 -17° 27° 46 7 0 0 0
03-01 10° 27° 46 7 0 0 0
03-02 -1° 11° 46 7 0 0 0
2014Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
03-03 -12° 16° 46 7 0 0 0
03-04 24° 46 7 0 0 0
03-05 15° 22° 46 7 0 0 0
03-06 11° 29° 46 7 0 0 0
03-07 42° 48 7 0 0 0
03-08 35° 48 7 0 0 0
03-09 38° 48 7 0 0 0
03-10 38° 48° 70 18 1 0 0
03-11 31° 44° 85 23 1 0 0
03-12 34° 85 23 1 0 0
03-13 -2° 33° 85 23 1 0 0
03-14 35° 49° 105 34 1 0 0
2014Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
03-15 24° 37° 114 34 1 0 0
03-16 10° 27° 114 34 1 0 0
03-17 -1° 34° 114 34 1 0 0
03-18 29° 51° 132 41 1 0 0
03-19 34° 45° 149 49 1 0 0
03-20 31° 45° 165 55 1 0 0
03-21 31° 55° 186 65 2 0 0
03-22 31° 41° 200 69 2 0 0
03-23 18° 30° 202 69 2 0 0
03-24 17° 35° 206 69 2 0 0
03-25 20° 29° 209 69 2 0 0
03-26 37° 209 69 2 0 0
2014Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
03-27 34° 49° 228 78 2 0 0
03-28 34° 50° 248 89 2 0 0
03-29 30° 42° 262 93 2 0 0
03-30 21° 56° 279 99 2 0 0
03-31 41° 67° 311 121 14 4 0
04-01 31° 57° 333 133 16 4 0
04-02 32° 49° 351 142 16 4 0
04-03 35° 42° 368 148 16 4 0
04-04 35° 44° 385 156 16 4 0
04-05 31° 52° 405 165 16 4 0
04-06 27° 58° 425 176 17 4 0
04-07 31° 59° 449 189 20 4 0
2014Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
04-08 44° 61° 479 210 31 6 0
04-09 31° 63° 504 225 36 6 0
04-10 42° 65° 536 246 48 10 0
04-11 32° 70° 565 266 57 12 0
04-12 41° 80° 604 294 75 22 6
04-13 45° 68° 638 319 90 28 7
04-14 30° 63° 663 333 94 28 7
04-15 20° 37° 669 333 94 28 7
04-16 16° 53° 682 336 94 28 7
04-17 41° 61° 711 355 103 29 7
04-18 36° 59° 737 371 109 29 7
04-19 34° 70° 766 390 118 31 7
2014Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
04-20 42° 80° 806 420 138 42 13
04-21 55° 75° 849 453 161 57 23
04-22 40° 60° 877 471 169 58 23
04-23 29° 55° 897 481 169 58 23
04-24 38° 67° 927 501 180 60 23
04-25 47° 70° 964 528 196 69 27
04-26 39° 57° 990 544 202 69 27
04-27 40° 61° 1018 562 210 69 27
04-28 45° 55° 1046 580 219 69 27
04-29 49° 58° 1078 602 230 72 27
04-30 42° 51° 1102 616 235 72 27
05-01 41° 47° 1124 628 237 72 27
2014Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
05-02 45° 52° 1151 645 244 72 27
05-03 45° 67° 1185 669 258 78 28
05-04 47° 60° 1217 691 269 82 28
05-05 45° 59° 1246 710 279 84 28
05-06 40° 66° 1277 731 290 87 28
05-07 51° 82° 1322 766 314 103 39
05-08 50° 90° 1370 804 342 123 55
05-09 56° 72° 1412 836 364 137 64
05-10 44° 78° 1451 865 383 148 70
05-11 55° 85° 1499 903 412 168 85
05-12 64° 86° 1552 946 445 193 105
05-13 53° 71° 1593 977 465 206 113
2014Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
05-14 50° 57° 1624 998 477 210 113
05-15 41° 53° 1650 1014 482 210 113
05-16 36° 48° 1670 1024 482 210 113
05-17 38° 60° 1697 1041 489 210 113
05-18 43° 70° 1731 1065 504 216 114
05-19 45° 70° 1767 1091 519 224 117
05-20 61° 88° 1819 1133 552 248 136
05-21 68° 89° 1876 1180 589 277 160
05-22 57° 74° 1920 1214 612 293 171
05-23 49° 73° 1958 1242 631 303 176
05-24 44° 77° 1997 1271 649 314 182
05-25 47° 86° 2041 1305 674 330 193
2014Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
05-26 63° 92° 2097 1351 709 358 216
05-27 68° 85° 2152 1396 744 384 237
05-28 59° 78° 2198 1432 771 403 251
05-29 56° 81° 2245 1469 797 422 265
05-30 54° 85° 2292 1506 825 441 279
05-31 57° 92° 2345 1549 857 465 298
06-01 65° 92° 2401 1595 893 494 322
06-02 71° 84° 2456 1640 929 521 344
06-03 67° 84° 2510 1684 962 546 364
06-04 60° 70° 2553 1717 985 561 374
06-05 50° 79° 2595 1749 1008 576 384
06-06 47° 84° 2639 1783 1032 592 395
2014Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
06-07 54° 87° 2688 1822 1060 613 411
06-08 57° 76° 2732 1856 1085 629 422
06-09 54° 81° 2778 1892 1110 647 435
06-10 58° 72° 2821 1925 1133 662 445
06-11 57° 66° 2860 1954 1153 673 451
06-12 61° 80° 2909 1993 1181 694 467
06-13 53° 76° 2952 2026 1204 708 476
06-14 49° 82° 2995 2059 1227 724 487
06-15 62° 86° 3047 2101 1259 748 506
06-16 64° 91° 3102 2146 1295 775 528
06-17 76° 93° 3165 2199 1337 810 558
06-18 64° 82° 3217 2241 1369 834 577
2014Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
06-19 62° 83° 3268 2282 1400 856 594
06-20 66° 86° 3321 2325 1434 882 615
06-21 64° 86° 3374 2368 1466 907 635
06-22 65° 85° 3427 2411 1500 932 655
06-23 68° 82° 3480 2454 1532 957 675
06-24 73° 85° 3537 2501 1570 986 699
06-25 63° 84° 3589 2543 1602 1010 718
06-26 59° 83° 3638 2582 1631 1031 734
06-27 61° 90° 3692 2626 1664 1057 755
06-28 73° 89° 3751 2675 1703 1088 781
06-29 69° 87° 3807 2721 1739 1116 804
06-30 68° 88° 3863 2767 1775 1144 827
2014Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
07-01 66° 80° 3914 2808 1806 1167 845
07-02 58° 71° 3957 2841 1829 1181 854
07-03 56° 77° 4001 2875 1854 1198 866
07-04 54° 81° 4047 2911 1879 1216 879
07-05 59° 79° 4094 2948 1906 1235 893
07-06 64° 88° 4148 2992 1940 1261 914
07-07 72° 90° 4207 3041 1979 1291 939
07-08 71° 82° 4261 3085 2013 1318 961
07-09 61° 82° 4310 3124 2043 1339 977
07-10 57° 81° 4358 3162 2070 1358 991
07-11 58° 83° 4406 3200 2099 1379 1007
07-12 70° 81° 4460 3244 2132 1404 1027
2014Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
07-13 68° 86° 4514 3288 2167 1431 1049
07-14 61° 81° 4563 3327 2196 1452 1065
07-15 53° 69° 4603 3357 2215 1464 1072
07-16 51° 73° 4643 3387 2235 1476 1079
07-17 50° 77° 4684 3418 2256 1489 1087
07-18 55° 81° 4730 3454 2282 1507 1100
07-19 55° 82° 4776 3490 2308 1525 1113
07-20 57° 83° 4824 3528 2336 1545 1128
07-21 59° 87° 4875 3569 2368 1568 1146
07-22 68° 91° 4933 3617 2405 1598 1171
07-23 60° 80° 4981 3655 2433 1618 1186
07-24 52° 78° 5024 3688 2456 1633 1196
2014Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
07-25 53° 75° 5066 3720 2479 1647 1205
07-26 68° 85° 5121 3765 2513 1674 1227
07-27 67° 88° 5177 3811 2549 1701 1249
07-28 57° 74° 5220 3844 2573 1717 1260
07-29 55° 80° 5266 3880 2598 1735 1273
07-30 57° 82° 5313 3917 2626 1754 1287
07-31 57° 85° 5362 3956 2655 1775 1303
08-01 60° 82° 5412 3996 2684 1796 1319
08-02 57° 86° 5461 4035 2714 1818 1336
08-03 61° 86° 5513 4077 2745 1842 1355
08-04 64° 85° 5565 4119 2778 1866 1374
08-05 66° 81° 5617 4161 2809 1890 1393
2014Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
08-06 61° 83° 5667 4201 2839 1912 1410
08-07 58° 83° 5715 4239 2868 1932 1425
08-08 63° 84° 5767 4281 2899 1955 1443
08-09 63° 82° 5817 4321 2930 1978 1461
08-10 67° 85° 5871 4365 2964 2004 1482
08-11 67° 83° 5924 4408 2996 2029 1502
08-12 61° 70° 5968 4442 3020 2044 1512
08-13 53° 83° 6014 4478 3046 2063 1526
08-14 57° 75° 6058 4512 3070 2079 1537
08-15 49° 78° 6099 4543 3092 2092 1545
08-16 59° 81° 6147 4581 3120 2112 1560
08-17 62° 75° 6194 4618 3146 2131 1574
2014Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
08-18 63° 84° 6245 4659 3178 2154 1592
08-19 69° 86° 6301 4705 3214 2182 1615
08-20 64° 87° 6354 4748 3247 2207 1635
08-21 70° 79° 6407 4791 3279 2232 1655
08-22 73° 87° 6465 4839 3317 2262 1680
08-23 69° 85° 6520 4884 3353 2289 1702
08-24 69° 88° 6577 4931 3389 2317 1725
08-25 71° 84° 6632 4976 3425 2345 1748
08-26 69° 84° 6687 5021 3460 2372 1770
08-27 65° 83° 6740 5064 3492 2397 1790
08-28 63° 80° 6790 5104 3522 2418 1806
08-29 69° 88° 6846 5150 3558 2447 1830
2014Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
08-30 71° 83° 6901 5195 3593 2474 1852
08-31 65° 86° 6955 5239 3627 2499 1872
09-01 71° 83° 7009 5283 3662 2526 1894
09-02 65° 84° 7061 5325 3694 2550 1913
09-03 58° 84° 7111 5365 3723 2572 1930
09-04 71° 84° 7166 5410 3758 2599 1952
09-05 65° 86° 7219 5453 3792 2624 1972
09-06 58° 76° 7264 5488 3817 2641 1984
09-07 51° 80° 7308 5522 3840 2656 1994
09-08 52° 78° 7351 5555 3863 2672 2005
09-09 62° 80° 7400 5594 3892 2693 2021
09-10 59° 79° 7447 5631 3919 2712 2035
2014Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
09-11 49° 57° 7478 5652 3930 2715 2035
09-12 45° 57° 7507 5671 3939 2715 2035
09-13 38° 58° 7533 5687 3945 2715 2035
09-14 38° 65° 7562 5706 3955 2717 2035
09-15 45° 59° 7592 5726 3965 2719 2035
09-16 41° 67° 7624 5748 3977 2723 2035
09-17 40° 70° 7658 5772 3990 2728 2035
09-18 46° 71° 7694 5798 4006 2737 2038
09-19 47° 75° 7733 5827 4025 2748 2044
09-20 59° 76° 7779 5863 4051 2765 2057
09-21 50° 68° 7816 5890 4068 2774 2061
09-22 41° 69° 7849 5913 4081 2779 2061
2014Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
09-23 44° 75° 7886 5940 4099 2789 2066
09-24 47° 78° 7927 5971 4119 2801 2073
09-25 51° 77° 7969 6003 4141 2815 2082
09-26 48° 82° 8012 6036 4164 2831 2092
09-27 54° 81° 8058 6072 4190 2848 2105
09-28 50° 82° 8101 6105 4214 2864 2115
09-29 53° 84° 8148 6142 4240 2882 2129
09-30 46° 58° 8178 6162 4250 2885 2129

 

Latest Updates

May 4th, 2015Early Season DMI Sprays Happening Now

The DMI timer has been sprinting across the Midwest region. Finally a string of warm weather has triggers alerts across Illinois and Ohio and closing in on Michigan.
 

March 23rd, 2015Crabgrass PRE Indicators Moving North

Last week started with a bang, but was mostly mild and steady. Evening winds helped things dry out here and there. Most accumulations are on pace with 2014 or slightly ahead now. Snow in Chicago today is a reminder that March is not over. Sign up for you automatic alerts using the link above.
 

March 16th, 2015Melting Snow, Clear Skies

What a difference a week makes. I think we can see spring from here. As the weather forecast from last week indicated, we made up for lost time across the Midwest last week. Most models are at or ahead of last year after being behind.
 

March 16th, 2015Mapping and Forecast Functions Restored

Well, that was fun. After a little bit of lost sleep (OK, actually several nights) the mapping and forecast functions have been restored. Thanks to the GDDTracker technical team for sticking with it to get this fixed.
 

March 10th, 2015Follow GDDTracker on Twitter.

We will be providing periodic updates and comments this spring via Twitter. If you would like to be part of that conversation, give us a follow @gddtracker.
 

March 9th, 2015Spring is on the way (we hope).

GDDTracker is reset for 2015. Although it's been abnormally cold for most the region it looks like things will warm up for most of this week and start melting some snow. Over the winter the NWS upgraded their forecast resolution (which is great), however, this is playing havoc with our mapping formulas. We are re-writing the code so we can properly provide forecasts by zip code. Stay tuned, hope to have this fixed soon.
 

March 2nd, 2014Ready, Set... Reset, Go!

The GDD totals were mistakenly reset on Jan 3rd instead of Feb 15th. This has been corrected. Some alerts may be resent due to the change. Thank you!
 

April 9th, 2013GDDTracker Expands Coverage

With initial funding provided by the Michigan State University and the Michigan Turfgrass Foundation, GDDTracker has been helping turf managers schedule Poa annua seedhead suppression applications throughout the Great Lakes states since 2004. Over the last couple years we've been considering several strategies for expanding the geographical reach of GDDTracker beyond our base region. After much consideration we have decided to expand coverage from Colorado to the atlantic coast. Historically the models we've used to schedule PGR applications to suppress Poa seedheads in our region have been successful but as we move outside of our immediate comfort zone users should keep in mind that the ultimate combination of personal observations, experience, and GDD models should all be considered when scheduling applications. Although GDDTracker started as a guide for scheduling PGR applications for Poa seedhead suppression, over the years we have added models for crabgrass preemergence, spring broadleaf, and others. As GDDTracker grows we will continue to move forward with additional models. We hope you find GDDTracker useful for your operation and as always your feedback is always encouraged.