Crook County's Large Acreage Subdivision Regulation: What Changed in 2022

A state-law option Crook County chose to use

The 35-to-140-acre review requirement isn't something Crook County invented on its own authority -- it comes from Wyoming Statute 18-5-316, which has allowed any Wyoming county to adopt, by resolution, its own "Large Acreage Subdivision Permit" requirement covering land divisions that create parcels between 35 and 140 acres (and, with owner and applicant consent, parcels larger than 140 acres too). That statute has been on the books for years; what's specific to Crook County is that its Board of County Commissioners actually exercised the option, adopting a Large Acreage Subdivision Regulation by resolution on September 14, 2022, effective December 1, 2022, after the county said it was "experiencing a significant increase in lands being developed in large acreage developments." Other Wyoming counties could adopt a similar resolution; whether any others currently have is not confirmed here, so don't assume Crook's approach is either unique statewide or universal -- check directly with a specific county's planning office.

What the regulation actually requires

Crook County's stated purpose for the regulation is protecting "the common interests of the general public, the landowner and the applicant" as large-acreage development increases -- concretely, that means a division creating 35-to-140-acre lots now goes through county review covering road width and access standards, impacts to water sources and drainages, easements for overhead electrical power (a minimum 30-foot easement width applies), impacts to wildlife and migration routes, and fire-protection status and description for the resulting parcels. The regulation also sets its own design, engineering, and surveying standards, plus rules for constructing access driveways and turnouts onto Crook County roadways -- meaningful new infrastructure and access requirements that a division of this size wouldn't have faced under the state's general 35-acre exemption alone.

A built-in variance process lets the Board of County Commissioners grant relief from a specific requirement if an applicant demonstrates that "peculiar physical conditions" make literal enforcement impractical or would cause undue hardship -- so the standards aren't absolute, but getting a variance still means making that case to the commissioners rather than assuming an exception applies automatically.

A real workaround: dividing ownership instead of the land

Within a few weeks of the regulation taking effect, county officials discovered developers had already found a way around it. According to the county's planning administrator, a developer working a roughly 1,200-acre parcel assigned each individual lot within it to a separate LLC -- structuring the transaction as a series of ownership transfers rather than a physical subdivision of the land -- which meant it didn't legally qualify as a "subdivision" under the regulation at all. Because the county's review authority is triggered by the act of subdividing, not simply by land changing hands, this approach let the development proceed without triggering the county's road, access, or emergency-services review -- exactly the oversight the regulation was written to create.

The practical lesson for a buyer: a large parcel marketed as already divided into smaller lots inside Crook County may or may not have actually gone through the county's Large Acreage review, depending on how the division was legally structured. Ask directly, and check with the Crook County Planning Department, rather than assuming county road-access and infrastructure standards were applied just because the land looks subdivided on a plat or listing map.

An unresolved gap: no family-transfer exemption

Unlike Crook County's ordinary Major and Minor Subdivision Regulations, the 2022 Large Acreage Subdivision Regulation does not include the family-transfer exemption common elsewhere in Wyoming subdivision law for transfers among family members. This came to a head with the Conzelman Family Ranch, a 230-acre property that five siblings inheriting it wanted to divide into five 65-acre tracts among themselves -- a transfer the regulation's stated purpose (keeping large parcels "in the hands of long-time residents and landowners") would seem to favor, but which the text as written doesn't exempt. Commissioners acknowledged this mismatch, and as of an April 2026 Land Use Planning & Zoning Commission session, a revised draft addressing it was sent to the Board of County Commissioners for approval or rejection. As of this writing, it's not confirmed whether that amendment has been formally adopted -- if a family-transfer division is part of your plan for Crook County acreage, ask the Planning Department directly whether the exemption has been added yet.

What this means before you buy, sell, or split land here

If you're buying or creating a parcel anywhere in the 35-to-140-acre range in unincorporated Crook County -- exactly the size most likely to be marketed elsewhere in Wyoming as a no-hassle "ranchette" split -- confirm with the Land Use Planning & Zoning Commission whether the Large Acreage Subdivision Regulation applies to your specific transaction, whether it was applied to a parcel you're considering buying, and whether the family-transfer exemption gap has since been closed. Don't assume the state's general 35-acre exemption is the whole story in this county, and don't assume a parcel that looks already subdivided actually went through county road, access, and utility review -- as the 2023 LLC workaround shows, it may not have.