Illinois deer research / Grundy County
Grundy County, Illinois Deer Hunting Research
Central IL region. FDR Deer Herd Index 46.8, ranked #68 of 102 Illinois counties. Built from IDNR public harvest records and the Buck Index.
C - Above AverageWhat drives the Grundy County index
The FDR Index combines five measured parts into one 0 to 100 score. Each part is scored 0–100 against all Illinois counties.
Buck Index
89→ out of 100. How this county ranks on the Buck Index against every county we cover. 100 is the top. Land is measured as what a hunter can actually hunt (10 m estimate).
Hunting pressure
Pressure Index 4.6 / 10 (Middle). About 5.2 deer hunters per square mile of huntable land: 46th percentile of 3,051 rated counties in 48 states, 53rd percentile within Illinois. How often deer run into people, 0 to 10 on one scale across every rated state; 10 is the most crowded county in the country.
Modeled. Illinois does not publish hunter numbers by county, so FDR places this county within Illinois from deer harvest per huntable acre (2020 to 2024 seasons) and population density. The model was checked against agency hunter counts in Michigan, Indiana and Missouri, and against agency hunter surveys by hunting unit in 10 more states. It estimates crowding; it is not a hunter count. Illinois averages 5.2 deer hunters per square mile of huntable land (state wildlife agency count, 2023-24 season).
2005–2024 harvest trend
| Season | Archery | Firearm | Total |
|---|---|---|---|
| 2024 | 331 | 330 | 753 |
| 2023 | 357 | 307 | 727 |
| 2022 | 371 | 285 | 736 |
| 2021 | 319 | 246 | 653 |
| 2020 | 365 | 276 | 713 |
| 2019 | 356 | 287 | 682 |
| 2018 | 332 | 295 | 702 |
| 2017 | 308 | 308 | 682 |
| 2016 | 294 | 315 | 681 |
| 2015 | 343 | 372 | 811 |
| 2014 | 345 | 349 | 784 |
| 2013 | 345 | 371 | 821 |
| 2012 | 399 | 502 | 1,006 |
| 2011 | 435 | 476 | 1,039 |
| 2010 | 436 | 606 | 1,042 |
| 2009 | 433 | 561 | 994 |
| 2008 | 462 | 510 | 972 |
| 2007 | 480 | 553 | 1,157 |
| 2006 | 521 | 530 | 1,051 |
| 2005 | 527 | 576 | 1,103 |
Totals are IDNR's all-season county harvest; firearm includes the youth, muzzleloader and late-winter seasons. Source: Hunt Illinois county deer harvest. Buck density: Grundy County averages 2.67 adult bucks harvested per 1,000 huntable acres (2005-2024).
See full Grundy County harvest charts →
Harvest by sex
IDNR records each harvested deer by sex. In 2024, Grundy County ran 410 bucks (males) and 343 does (females): 54.4% bucks.
| Season | Bucks (M) | Does (F) | Total | % bucks |
|---|---|---|---|---|
| 2024 | 410 | 343 | 753 | 54.4% |
| 2023 | 445 | 282 | 727 | 61.2% |
| 2022 | 412 | 324 | 736 | 56% |
| 2021 | 386 | 267 | 653 | 59.1% |
| 2020 | 397 | 316 | 713 | 55.7% |
| 2019 | 371 | 311 | 682 | 54.4% |
| 2018 | 408 | 294 | 702 | 58.1% |
| 2017 | 373 | 309 | 682 | 54.7% |
| 2016 | 377 | 304 | 681 | 55.4% |
| 2015 | 449 | 362 | 811 | 55.4% |
| 2014 | 414 | 370 | 784 | 52.8% |
| 2013 | 415 | 406 | 821 | 50.5% |
| 2012 | 547 | 459 | 1,006 | 54.4% |
| 2011 | 527 | 512 | 1,039 | 50.7% |
| 2010 | 530 | 512 | 1,042 | 50.9% |
| 2009 | 482 | 512 | 994 | 48.5% |
| 2008 | 489 | 483 | 972 | 50.3% |
| 2007 | 584 | 573 | 1,157 | 50.5% |
| 2006 | 556 | 495 | 1,051 | 52.9% |
| 2005 | 621 | 482 | 1,103 | 56.3% |
See full Grundy County sex-composition chart →
Age structure
IDNR classifies each deer as adult, yearling (1.5-yr), or fawn. In 2024, Grundy County ran 69.1% adult, 16.2% yearling, and 14.7% fawn. A higher adult share points to a more mature age structure.
| Season | Adult | Yearling | Fawn | Total |
|---|---|---|---|---|
| 2024 | 520 | 122 | 111 | 753 |
| 2023 | 482 | 154 | 91 | 727 |
| 2022 | 489 | 124 | 123 | 736 |
| 2021 | 415 | 147 | 89 | 651 |
| 2020 | 454 | 143 | 116 | 713 |
| 2019 | 463 | 126 | 93 | 682 |
| 2018 | 434 | 141 | 127 | 702 |
| 2017 | 444 | 123 | 115 | 682 |
| 2016 | 419 | 113 | 149 | 681 |
| 2015 | 506 | 149 | 156 | 811 |
| 2014 | 497 | 132 | 155 | 784 |
| 2013 | 478 | 144 | 199 | 821 |
| 2012 | 596 | 182 | 228 | 1,006 |
| 2011 | 647 | 159 | 233 | 1,039 |
| 2010 | 628 | 155 | 259 | 1,042 |
| 2009 | 632 | 133 | 225 | 990 |
| 2008 | 605 | 146 | 221 | 972 |
| 2007 | 731 | 176 | 250 | 1,157 |
| 2006 | 650 | 165 | 236 | 1,051 |
| 2005 | 677 | 177 | 248 | 1,102 |
Age class is IDNR's field classification at check-in, not a lab-aged tooth-wear cohort; treat it as a directional maturity signal.
See full Grundy County composition charts →
Seasons & access
| Season | Method | Dates | Tags |
|---|---|---|---|
| Archery · Oct 1 to mid-Jan | archery | 2026-10-01 → 2027-01-17 | otc |
| Firearm · 1st + 2nd Shotgun Season | firearm | 2026-11-20 → 2026-12-06 | otc |
| Muzzleloader · December | muzzleloader | 2026-12-11 → 2026-12-13 | otc |
Bow-huntable land, public and private: 81,015 acres (10 m estimate). Verify current season dates, permits, and site-specific rules with IDNR before hunting.
Where to hunt public in Grundy County
Full list on the Illinois public hunting land directory.
See Grundy County on the map
Parcels with owner & acreage, public hunting land with regs, access points, leaf-off imagery, and this research, together on one hunting map.
Nearby counties
Frequently asked questions
Is Grundy County, Illinois good for deer hunting?
Grundy County scores 46.8 of 100 on the FDR Deer Herd Index (C - Above Average), ranked #68 of 102 Illinois counties. The index is built from IDNR public harvest records, habitat, herd quality, momentum, and the Buck Index.
What is the Buck Index for Grundy County?
Grundy County has a Buck Index of 89 out of 100. How this county ranks on the Buck Index against every county we cover. 100 is the top. Land is measured as what a hunter can actually hunt (10 m estimate).
Is there public hunting land in Grundy County, Illinois?
Yes: the Illinois public hunting land directory lists 3 sites in Grundy County, including Goose Lake Prairie State Natural Area, Illinois and Michigan Canal State Trail, Heidecke Lake State Fish and Wildlife Area. Always verify current site regulations and permit requirements before hunting.
How many deer were harvested in Grundy County last season?
IDNR records show 753 deer harvested in Grundy County in 2024, the most recent reported season.
Cite this
Fully Drawn Research. "Grundy County, Illinois deer hunting research." County page. https://www.fullydrawnresearch.ai/research/il/grundy. Accessed Nov 1, 2026.
Data and charts from this page are free to use with attribution. See the Content Lab.