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Crabgrass/Annual Bluegrass Preemergence Timer (GDD 32)
through Mon, May. 17. 2021

 

GDD Total: 1576 (Base 32) through Mon, May. 17, 2021

  

Indianapolis, IN

       

Forecast »

Done

801

Late

500

Optimum

250

Early

171

Under

0

 

Generously Supported By:



Tabular Data

Daily GDD accumulation for various base temperature models in 2021 & 2020

2021Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
02-15 10° 16° 4 0 0 0 0
02-16 17° 4 0 0 0 0
02-17 -6° 22° 4 0 0 0 0
02-18 14° 25° 4 0 0 0 0
02-19 22° 4 0 0 0 0
02-20 12° 32° 4 0 0 0 0
02-21 23° 41° 14 0 0 0 0
02-22 33° 41° 29 5 0 0 0
02-23 37° 51° 51 17 2 0 0
02-24 35° 56° 75 31 6 0 0
02-25 28° 44° 89 35 6 0 0
02-26 26° 47° 103 40 6 0 0
2021Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
02-27 40° 57° 130 56 12 0 0
02-28 41° 60° 159 75 21 1 0
02-29 n/a n/a n/a n/a n/a n/a n/a
03-01 29° 42° 173 79 21 1 0
03-02 23° 44° 184 81 21 1 0
03-03 31° 60° 208 94 25 1 0
03-04 32° 48° 226 102 25 1 0
03-05 23° 47° 239 105 25 1 0
03-06 25° 47° 252 109 25 1 0
03-07 24° 52° 268 115 25 1 0
03-08 32° 65° 295 131 31 1 0
03-09 40° 66° 327 153 43 4 0
2021Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
03-10 52° 68° 365 181 61 15 5
03-11 49° 65° 400 206 76 22 7
03-12 38° 58° 426 222 82 22 7
03-13 37° 51° 448 234 84 22 7
03-14 32° 54° 469 245 85 22 7
03-15 32° 47° 487 253 85 22 7
03-16 35° 49° 507 263 86 22 7
03-17 41° 61° 536 282 95 23 7
03-18 36° 55° 560 296 98 23 7
03-19 30° 47° 577 303 98 23 7
03-20 26° 59° 597 314 99 23 7
03-21 33° 66° 625 331 106 23 7
2021Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
03-22 40° 67° 656 352 118 26 7
03-23 48° 65° 691 377 133 33 9
03-24 54° 71° 732 408 153 46 17
03-25 43° 59° 761 427 163 47 17
03-26 45° 61° 792 448 174 50 17
03-27 42° 75° 829 475 190 59 20
03-28 38° 56° 854 490 195 59 20
03-29 30° 60° 876 503 198 59 20
03-30 45° 73° 914 530 215 68 25
03-31 38° 54° 938 544 219 68 25
04-01 26° 37° 947 544 219 68 25
04-02 22° 49° 961 547 219 68 25
2021Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
04-03 32° 65° 987 564 226 68 25
04-04 45° 74° 1025 591 243 77 29
04-05 49° 77° 1066 622 264 90 37
04-06 53° 78° 1109 655 287 105 47
04-07 56° 78° 1154 690 312 122 59
04-08 57° 67° 1194 720 332 134 66
04-09 51° 78° 1236 753 355 149 75
04-10 54° 66° 1274 781 373 159 80
04-11 47° 52° 1302 799 381 159 80
04-12 49° 65° 1337 823 395 165 82
04-13 45° 65° 1370 846 408 170 82
04-14 46° 60° 1401 868 420 174 82
2021Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
04-15 37° 54° 1425 881 423 174 82
04-16 35° 61° 1451 897 429 174 82
04-17 43° 60° 1480 917 439 175 82
04-18 36° 63° 1507 934 446 175 82
04-19 41° 66° 1539 956 458 179 82
04-20 31° 43° 1555 961 458 179 82
04-21 27° 45° 1569 965 458 179 82
04-22 34° 53° 1590 977 459 179 82
04-23 36° 60° 1616 993 465 179 82
04-24 48° 55° 1646 1012 475 181 82
04-25 43° 59° 1675 1032 484 182 82
04-26 40° 76° 1711 1057 500 189 85
2021Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
04-27 60° 84° 1760 1097 529 211 102
04-28 67° 73° 1808 1135 557 231 116
04-29 53° 67° 1846 1162 575 241 121
04-30 46° 67° 1881 1187 590 247 123
05-01 38° 74° 1915 1211 604 254 124
05-02 59° 77° 1961 1248 630 272 137
05-03 57° 69° 2002 1279 651 285 145
05-04 51° 66° 2039 1305 668 293 149
05-05 46° 61° 2070 1327 679 297 149
05-06 41° 60° 2099 1345 688 298 149
05-07 39° 62° 2128 1364 697 298 149
05-08 35° 58° 2152 1379 701 298 149
2021Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
05-09 41° 52° 2177 1394 706 298 149
05-10 34° 60° 2202 1409 711 298 149
05-11 45° 57° 2231 1428 720 299 149
05-12 37° 61° 2258 1445 727 299 149
05-13 40° 65° 2289 1466 738 302 149
05-14 42° 69° 2323 1489 752 308 150
05-15 44° 71° 2359 1515 768 315 152
05-16 55° 71° 2399 1546 788 328 160
05-17 57° 66° 2439 1576 808 340 167
05-18 59° 74° 2484 1610 833 357 179
05-19 62° 79° 2532 1649 861 377 194
05-20 62° 84° 2583 1690 892 400 212
2021Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
05-21 63° 85° 2636 1732 925 424 231
05-22 63° 87° 2689 1775 958 449 251
05-23 64° 87° 2742 1819 991 475 272
05-24 65° 86° 2796 1862 1025 500 292
2020Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
02-15 41° 3 0 0 0 0
02-16 32° 46° 20 7 0 0 0
02-17 29° 45° 35 12 0 0 0
02-18 31° 49° 53 20 0 0 0
02-19 23° 38° 62 20 0 0 0
02-20 21° 31° 66 20 0 0 0
02-21 14° 34° 68 20 0 0 0
02-22 21° 46° 80 21 0 0 0
02-23 32° 52° 100 31 0 0 0
02-24 38° 44° 119 40 0 0 0
02-25 35° 42° 136 47 0 0 0
02-26 27° 35° 145 47 0 0 0
2020Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
02-27 22° 35° 152 47 0 0 0
02-28 21° 29° 155 47 0 0 0
02-29 16° 36° 158 47 0 0 0
03-01 26° 59° 179 57 0 0 0
03-02 48° 53° 207 76 9 1 0
03-03 40° 54° 232 91 14 1 0
03-04 35° 52° 254 102 15 1 0
03-05 30° 57° 275 114 17 1 0
03-06 28° 42° 288 117 17 1 0
03-07 22° 48° 302 120 17 1 0
03-08 32° 65° 328 137 24 1 0
03-09 51° 63° 363 162 39 8 2
2020Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
03-10 39° 56° 389 177 44 8 2
03-11 39° 46° 409 188 45 8 2
03-12 43° 58° 438 207 54 8 2
03-13 36° 55° 462 220 57 8 2
03-14 34° 41° 477 226 57 8 2
03-15 32° 44° 493 232 57 8 2
03-16 38° 46° 514 242 57 8 2
03-17 38° 54° 537 256 61 8 2
03-18 39° 50° 560 269 64 8 2
03-19 47° 66° 595 293 78 15 4
03-20 34° 66° 623 311 86 15 4
03-21 29° 35° 633 312 86 15 4
2020Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
03-22 27° 37° 644 312 86 15 4
03-23 36° 43° 661 320 86 15 4
03-24 37° 50° 682 331 88 15 4
03-25 34° 61° 708 347 93 15 4
03-26 44° 65° 740 369 106 20 4
03-27 52° 58° 774 392 119 25 4
03-28 56° 70° 815 423 140 38 12
03-29 53° 66° 852 450 157 47 16
03-30 42° 58° 880 469 165 47 16
03-31 38° 44° 899 478 165 47 16
04-01 40° 53° 924 492 170 47 16
04-02 33° 61° 949 507 175 47 16
2020Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
04-03 45° 68° 983 532 189 54 18
04-04 45° 56° 1012 551 198 55 18
04-05 41° 54° 1038 567 204 55 18
04-06 39° 68° 1070 588 216 59 18
04-07 56° 79° 1116 624 242 77 31
04-08 58° 80° 1163 661 269 96 45
04-09 37° 55° 1187 676 273 96 45
04-10 32° 50° 1206 684 273 96 45
04-11 40° 62° 1235 703 282 97 45
04-12 49° 61° 1268 727 295 102 45
04-13 37° 54° 1291 740 299 102 45
04-14 31° 45° 1307 746 299 102 45
2020Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
04-15 30° 45° 1323 752 299 102 45
04-16 27° 48° 1338 757 299 102 45
04-17 36° 48° 1358 767 299 102 45
04-18 31° 55° 1379 778 300 102 45
04-19 40° 62° 1408 797 309 103 45
04-20 37° 64° 1437 816 318 104 45
04-21 44° 55° 1464 833 325 104 45
04-22 36° 71° 1496 855 337 107 45
04-23 53° 61° 1531 880 352 114 47
04-24 48° 67° 1566 905 367 121 49
04-25 49° 67° 1602 931 383 130 52
04-26 43° 61° 1633 951 393 132 52
2020Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
04-27 36° 67° 1662 971 403 134 52
04-28 55° 76° 1706 1005 427 149 63
04-29 52° 67° 1744 1032 444 159 68
04-30 45° 51° 1770 1048 450 159 68
05-01 39° 68° 1801 1069 461 162 68
05-02 55° 82° 1848 1106 488 181 81
05-03 53° 73° 1889 1137 509 194 89
05-04 47° 65° 1923 1161 523 200 91
05-05 42° 58° 1951 1179 531 200 91
05-06 39° 60° 1978 1197 539 200 91
05-07 44° 66° 2011 1220 552 205 91
05-08 38° 55° 2035 1234 556 205 91
2020Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
05-09 29° 56° 2055 1244 556 205 91
05-10 39° 61° 2083 1262 564 205 91
05-11 39° 49° 2105 1274 566 205 91
05-12 36° 60° 2132 1290 572 205 91
05-13 41° 60° 2160 1309 581 205 91
05-14 54° 77° 2203 1342 604 221 101
05-15 63° 73° 2250 1378 630 239 114
05-16 56° 80° 2296 1414 656 257 127
05-17 65° 75° 2343 1452 684 277 142
05-18 56° 68° 2383 1482 704 289 149
05-19 57° 67° 2424 1513 725 301 156
05-20 54° 58° 2458 1537 739 307 157
2020Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
05-21 54° 61° 2494 1563 755 315 160
05-22 57° 75° 2538 1597 779 331 171
05-23 62° 78° 2586 1635 807 351 186
05-24 62° 85° 2637 1676 838 375 205
05-25 65° 87° 2691 1720 872 401 226
05-26 66° 86° 2746 1765 907 427 247
05-27 68° 82° 2799 1808 940 452 267
05-28 67° 80° 2851 1849 971 476 286
05-29 64° 77° 2899 1888 1000 496 301
05-30 55° 72° 2941 1919 1021 510 310
05-31 54° 71° 2981 1950 1042 522 317
06-01 50° 74° 3021 1980 1062 534 325
2020Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
06-02 61° 88° 3074 2023 1095 559 345
06-03 69° 88° 3131 2070 1132 588 368
06-04 67° 84° 3184 2113 1165 614 389
06-05 67° 86° 3239 2158 1200 640 410
06-06 69° 89° 3296 2205 1237 669 434
06-07 59° 84° 3346 2245 1267 691 451
06-08 63° 88° 3400 2288 1300 717 472
06-09 72° 85° 3456 2335 1337 745 496
06-10 66° 84° 3509 2378 1370 771 516
06-11 60° 81° 3558 2416 1398 791 531
06-12 59° 85° 3608 2457 1429 813 548
06-13 61° 75° 3654 2493 1455 831 561
2020Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
06-14 55° 76° 3697 2526 1478 847 572
06-15 52° 79° 3741 2560 1502 862 582
06-16 60° 83° 3790 2599 1531 884 599
06-17 61° 85° 3841 2640 1562 907 617
06-18 63° 86° 3894 2683 1595 931 636
06-19 65° 90° 3949 2728 1630 959 659
06-20 67° 91° 4007 2776 1668 988 683
06-21 67° 78° 4057 2816 1698 1010 700
06-22 63° 87° 4110 2859 1731 1035 720
06-23 66° 77° 4160 2899 1761 1057 737
06-24 61° 80° 4209 2937 1789 1078 753
06-25 61° 84° 4259 2978 1820 1100 770
2020Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
06-26 66° 90° 4315 3024 1856 1128 794
06-27 68° 79° 4367 3065 1887 1152 812
06-28 71° 82° 4421 3110 1922 1178 833
06-29 70° 86° 4477 3156 1958 1206 856
06-30 69° 85° 4532 3201 1993 1233 878
07-01 68° 88° 4588 3247 2029 1261 901
07-02 69° 88° 4645 3294 2066 1290 925
07-03 68° 90° 4702 3341 2103 1319 949
07-04 71° 90° 4761 3389 2141 1350 975
07-05 71° 91° 4820 3438 2180 1381 1001
07-06 71° 91° 4879 3488 2220 1412 1027
07-07 71° 88° 4937 3535 2257 1442 1052
2020Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
07-08 71° 90° 4995 3584 2296 1472 1077
07-09 69° 90° 5053 3632 2334 1502 1102
07-10 74° 84° 5110 3679 2371 1531 1126
07-11 66° 87° 5164 3723 2405 1558 1148
07-12 64° 82° 5216 3764 2436 1581 1166
07-13 60° 81° 5264 3803 2465 1601 1182
07-14 61° 86° 5316 3844 2496 1625 1200
07-15 64° 89° 5370 3889 2531 1651 1221
07-16 71° 80° 5424 3932 2564 1677 1242
07-17 64° 89° 5478 3977 2599 1703 1263
07-18 70° 90° 5536 4025 2637 1733 1289
07-19 72° 87° 5594 4072 2674 1763 1313
2020Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
07-20 69° 83° 5648 4116 2708 1789 1334
07-21 68° 86° 5703 4162 2744 1816 1357
07-22 69° 84° 5758 4207 2779 1843 1378
07-23 72° 85° 5814 4253 2815 1871 1401
07-24 65° 84° 5866 4295 2847 1895 1421
07-25 63° 88° 5919 4338 2880 1921 1441
07-26 67° 91° 5976 4385 2917 1950 1465
07-27 72° 88° 6035 4433 2955 1980 1490
07-28 69° 85° 6090 4478 2990 2007 1512
07-29 65° 87° 6144 4522 3024 2033 1533
07-30 68° 76° 6194 4563 3055 2055 1550
07-31 66° 80° 6245 4604 3086 2078 1568
2020Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
08-01 66° 74° 6293 4642 3114 2098 1583
08-02 62° 80° 6342 4681 3143 2119 1599
08-03 63° 78° 6391 4719 3171 2140 1615
08-04 62° 75° 6437 4756 3198 2158 1628
08-05 52° 74° 6478 4787 3219 2171 1636
08-06 57° 78° 6523 4822 3244 2189 1649
08-07 57° 81° 6570 4859 3271 2208 1663
08-08 57° 84° 6619 4897 3299 2228 1678
08-09 64° 87° 6672 4941 3333 2254 1699
08-10 68° 86° 6728 4986 3368 2281 1721
08-11 67° 83° 6781 5030 3402 2306 1741
08-12 65° 84° 6833 5072 3434 2331 1761
2020Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
08-13 65° 85° 6887 5115 3467 2356 1781
08-14 69° 85° 6942 5161 3503 2383 1803
08-15 65° 88° 6996 5205 3537 2410 1825
08-16 69° 83° 7051 5249 3571 2436 1846
08-17 63° 84° 7102 5291 3603 2460 1865
08-18 62° 78° 7151 5329 3631 2480 1880
08-19 55° 80° 7196 5365 3657 2497 1892
08-20 56° 81° 7243 5401 3683 2516 1906
08-21 57° 84° 7291 5440 3712 2536 1921
08-22 59° 86° 7342 5481 3743 2559 1939
08-23 64° 86° 7395 5524 3776 2584 1959
08-24 70° 90° 7453 5572 3814 2614 1984
2020Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
08-25 72° 92° 7513 5621 3853 2646 2011
08-26 70° 90° 7570 5669 3891 2676 2036
08-27 73° 82° 7626 5715 3927 2703 2058
08-28 74° 84° 7683 5762 3964 2733 2083
08-29 68° 83° 7737 5806 3998 2758 2103
08-30 56° 77° 7782 5841 4023 2775 2115
08-31 61° 83° 7832 5880 4052 2797 2132
09-01 66° 80° 7883 5922 4084 2820 2150
09-02 69° 79° 7935 5964 4116 2844 2170
09-03 66° 86° 7989 6008 4150 2870 2191
09-04 57° 77° 8034 6043 4175 2888 2203
09-05 52° 83° 8080 6079 4201 2905 2215
2020Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
09-06 57° 80° 8126 6115 4227 2924 2229
09-07 69° 85° 8182 6160 4262 2951 2251
09-08 68° 90° 8238 6207 4299 2979 2275
09-09 63° 88° 8292 6251 4333 3005 2295
09-10 67° 74° 8341 6290 4362 3026 2311
09-11 64° 76° 8389 6328 4390 3046 2326
09-12 65° 83° 8441 6370 4422 3071 2346
09-13 65° 80° 8492 6411 4453 3093 2363
09-14 55° 77° 8536 6445 4477 3110 2375
09-15 52° 77° 8579 6478 4500 3124 2384
09-16 46° 81° 8621 6509 4521 3138 2393
09-17 52° 78° 8664 6542 4544 3153 2403
2020Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
09-18 50° 66° 8700 6569 4561 3161 2406
09-19 42° 69° 8733 6592 4574 3167 2407
09-20 43° 74° 8770 6618 4590 3175 2410
09-21 44° 76° 8808 6646 4608 3185 2415
09-22 45° 77° 8847 6676 4628 3196 2421
09-23 50° 75° 8887 6706 4648 3208 2428
09-24 54° 78° 8931 6739 4671 3224 2439
09-25 52° 78° 8974 6773 4695 3239 2449
09-26 57° 75° 9018 6807 4719 3255 2460
09-27 59° 80° 9066 6844 4746 3275 2475
09-28 52° 67° 9103 6872 4764 3284 2480
09-29 44° 63° 9135 6893 4775 3288 2480
2020Lo
(F)
Hi
(F)
GDD
22
GDD
32
GDD
42
GDD
50
GDD
55
09-30 48° 73° 9173 6922 4794 3298 2485

 

Latest Updates

February 19th, 2021Welcome to the 2021 GDD Tracking Season

Despite the frigid temperatures covering most of the country this week, GDDtracker started counting on February 15. As temperatures warm and snow fall melts the first two models that gather the most attention are the Proxy/Primo timer for scheduling annual bluegrass seedhead suppression applications and the crabgrass preemergence application timer. As the season progresses the early season DMI timer and the Smith-Kerns dollar spot prediction model gather views. Further information on all models can be found under the "About" tab at the top of the screen. Thanks for your continued use and support of GDDtracker and best wishes for a successful 2021 growing season!