Whitetail rut timing may have a slight connection with latitude, tending a bit earlier in the north and a bit later in the south. Yearly harvest totals make that pattern tough to pick out, so this paper looks at Ohio, where county harvest counts are available for each week of the season. The analysis divided the state's weekly archery harvest, which hunters are required to report, into groups of Lake Erie counties and Ohio River counties. Across three consecutive seasons, the northern group's harvest-weighted average week came about one to three days before the southern group's each time. The gap is minor: harvest peaks in the same week in both groups. Ohio's weekly county reporting lets this steady but slight pattern show through.
KEY FINDINGS
- Over a north-to-south distance of ~150 miles, archery harvest in Ohio's Lake Erie counties centers earlier by 1.4 to 2.9 days compared with counties beside the Ohio River. That ordering holds across each of the three measured seasons (2023, 2024, 2025).
- A real, modest difference appears even though both groups share one peak week in mid-November. Harvest on either side of that peak creates the gap: southern counties show a clearly heavier share after the high point. In 2024, week 8 accounts for 13.7% of their archery kill, compared with 9.8% up north.
- The northern group's harvest falls earlier in all three seasons studied, matching what a small, real tendency associated with latitude could look like. Three seasons are too few to dismiss chance, and the data neither isolate photoperiod nor rule out confounding from weather and hunter effort.
- This comparison works in Ohio because its county reports arrive weekly throughout the season and separate harvest by weapon. The necessary detail is county harvest broken out by both reporting week and weapon during the season. Ohio's required game check supplies it.
IA CLAIM YOU USUALLY CAN'T TEST
Why harvest totals conceal timing
Farther north, expecting the rut to occur slightly sooner is reasonable. Biologists attribute breeding timing to photoperiod, which varies by latitude (Green et al. 2017). To detect a timing change in the harvest, counts must be grouped by week instead of season, and place must be reported in enough detail to distinguish northern areas from southern ones. Ohio provides that combination. Mandatory telecheck supplies counts for each county every week. The archery season covers report-weeks from 2 to 11 in this study. That makes the bow harvest a proxy for when activity occurs, although hunter effort and success affect it too. The analysis compared weekly archery curves from two Ohio county bands separated by roughly 2.5° in latitude: thirteen counties along Lake Erie and Ohio's northern border, compared with twelve counties beside the Ohio River. Together, they account for 25 out of Ohio's 88 counties.
- Lake Erie band (north)
- Ohio River band (south)
IITHE SIZE OF THE SHIFT
The annual pattern holds, with a gap of days rather than weeks
We describe a timing curve through its center of mass, an average reporting week weighted by the deer taken. Weeks with larger kills carry greater weight. Calculate that average separately for both bands, and the north leads in every season: 0.24 week for 2023, 0.42 week for 2024, and 0.20 week for 2025. In calendar terms, the north's archery harvest centers approximately one and a half days to three days ahead of the south's. Both bands share the week of greatest harvest. This slight shift concerns average harvest timing: the northern kill averages a few days ahead of the southern kill. Rut timing is not measured by that shift. The authors give the signal credibility because of its consistency. The northern center falls earlier in all three seasons studied (2023, 2024, 2025). That is a short history. With three coin flips, getting the same result each time happens once in eight.
Swipe table to see every column
| Season | North center-of-mass | South center-of-mass | North earlier by |
|---|---|---|---|
| 2023 | week 5.75 | week 5.99 | ≈ 1.7 days |
| 2024 | week 5.90 | week 6.32 | ≈ 2.9 days |
| 2025 | week 6.21 | week 6.41 | ≈ 1.4 days |
In these Ohio records, the southern archery harvest's center falls about two days behind the northern center. That measured difference is real, yet modest.
IIIWHAT NOT TO DO WITH IT
A two-day finding does not make a rut map
A result like this invites a tempting next step: a map coloring rut dates across several states. We will not take that step; these records cannot support it. What we measured is an average difference of a few days between county groups within Ohio. We calculated no uncertainty estimate. Hunter behavior also confounds the result, with weekends, weather, holidays, and mast affecting when archery harvest occurs. Carrying this finding into other states would amount to fabrication, beyond mere imprecision, because we have not tested whether neighboring states' county reports from within the season could be aligned on a common comparison scale. We will stay with the narrow claim the evidence supports: in one state requiring game checks, across three seasons, northern archery harvest centers roughly two days before southern harvest. We assert nothing outside Ohio.
IVWHY OHIO'S DATA CAN SHOW THIS
Required telecheck produces the detail this measurement needs
Ohio can support this comparison because of its deer check-in rules. Each deer has to be reported during the season, allowing updated harvest counts for every county to be released each week. Studying how timing varies with latitude takes just that sort of county detail week by week. Annual estimates drawn from surveys cannot reveal a county's harvest timing week by week. This paper makes no comparison with those estimates. Hunters should keep the geographic averages in context: archery harvest averages earlier near Lake Erie and later near the Ohio River. Only a few days separate them. Hunter effort influences the gap, and breeding dates are not measured by it. Reports for individual counties every week, as Ohio provides, are needed to answer a timing question. Ohio's reporting frequency at the county level lets this small signal show up here.
NOTES AND SOURCES
- The Division of Wildlife at the Ohio Department of Natural Resources (ODNR) supplies the source reports, which track white-tailed deer harvest weekly during each season. The source covers the 2023 to 24 season, the 2024 to 25 season, and the 2025 to 26 season. Analysis starts with cumulative archery tallies (archery_total_cum). Changes between consecutive reports are calculated and then added together for two county bands.
- The Lake Erie band in the north includes Williams, Fulton, Lucas, Ottawa, Sandusky, Erie, Lorain, Cuyahoga, Lake, Ashtabula, Defiance, Henry, Wood. For the southern band along the Ohio River, the counties are Hamilton, Clermont, Brown, Adams, Scioto, Lawrence, Gallia, Meigs, Washington, Monroe, Belmont, Jefferson. Latitude separates these bands by roughly 2.5° (~150 miles).
- The center-of-mass calculation averages archery reporting weeks with harvest as the weight, covering weeks 2 to 11. Turning that result into calendar days assumes seven days between reports. Each of the three seasons has the same modal week, or single harvest peak, for both county groups.
- Limits: only a few days separate the groups, and biology plus hunting effort, including weekends, weather, and mast, confound the result. It should stay within Ohio; it neither implies nor supports a rut-timing map across states. Archery harvest offers an indirect indicator of activity timing rather than measuring breeding dates directly.
Fully Drawn Research is an independent data analysis desk, not affiliated with any state wildlife agency, transportation agency, mapping provider or outfitter. Timing figures are derived from Ohio Department of Natural Resources public weekly harvest records, analyzed independently by FDR. The north-vs-south comparison is internal to Ohio and reflects a small (order-of-days) latitude effect; it is not evidence of rut timing in any other state and is not presented as a multi-state model. FDR is an independent data analysis desk, not affiliated with any state wildlife agency. Figures current to the 2025–26 season.
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