How Kittitas County Zoning Is Organized
Kittitas County's unincorporated land is governed by the Kittitas County Code, Title 17 (Zoning). The county divides land into roughly a dozen zone classifications, but property owners in rural areas most commonly encounter three categories: Agricultural zones, Rural Residential zones, and Forest Resource zones. Each has its own minimum lot sizes, permitted uses, and subdivision rules.
The first thing to determine is your parcel's zone designation. The easiest way is the county's online GIS parcel viewer at the Kittitas County Assessor's website, which shows the zone label for any parcel. Or look up your parcel using TerraVector's free parcel lookup at terravector.io — it pulls the zone, acreage, and basic constraints for any Washington State parcel in seconds.
Agricultural Zones: AG-20 and AG-40
Agricultural zones are the most common designation for rural Kittitas County land outside city limits. The number indicates the minimum parcel size in acres.
AG-20 (Agricultural, 20-Acre Minimum)
AG-20 is the dominant zone classification for valley-floor farmland in the Kittitas Valley and ranchland in the foothills. As the name suggests, the minimum lot size is 20 acres — meaning you cannot subdivide a parcel into lots smaller than 20 acres.
Permitted uses in AG-20:
- Single-family residential (one dwelling per parcel)
- Agriculture and livestock operations
- Agricultural accessory buildings (barns, silos, equipment storage)
- Utility structures
Uses requiring a Conditional Use Permit (CUP):
- Additional dwelling units (guest houses, farmworker housing)
- Agricultural tourism (u-pick farms, farm stays, event venues)
- Small-scale commercial operations tied to agricultural use
- Wireless communication towers
AG-40 (Agricultural, 40-Acre Minimum)
AG-40 covers the county's most productive agricultural lands, particularly in the eastern portions of the Kittitas Valley and foothills east of Ellensburg. The 40-acre minimum is designed to protect large contiguous agricultural operations from residential fragmentation. Permitted uses are similar to AG-20, but the subdivision floor is twice as restrictive.
Important: Washington's "short plat" rules still apply in agricultural zones — you can create up to 4 lots via a short plat process, but each lot must meet the zone's minimum size. A 100-acre AG-20 parcel can theoretically be split into five 20-acre parcels, but the fifth lot would require a formal long plat with full public hearing process.
Rural Residential Zones: RR-2.5, RR-5, RR-10
Rural Residential zones are found on the fringes of communities — around Cle Elum, Roslyn, South Cle Elum, and in subdivided areas on the edges of the Kittitas Valley. These zones allow residential development at higher densities than agricultural zones.
| Zone | Min. Lot Size | Primary Context | Residential Density |
|---|---|---|---|
| RR-2.5 | 2.5 acres | Near Cle Elum / Roslyn area | ~0.4 units/acre |
| RR-5 | 5 acres | Rural residential clusters | ~0.2 units/acre |
| RR-10 | 10 acres | Rural transition areas | ~0.1 units/acre |
Rural Residential zones allow subdivision to the minimum lot size using the standard short plat (2–4 lots) or long plat (5+ lots) processes. Each new lot still needs to meet water and septic requirements — no new lot can be created without demonstrating independent access to water and sewer service or on-site septic feasibility.
Conditional Use Permits: When You Need More Than a Permit
A Conditional Use Permit (CUP) is required for uses that aren't outright permitted in a zone but may be allowed with conditions. The CUP process involves a public notice period, neighbor notification, and a hearing before the Kittitas County Hearing Examiner.
Common CUP requests in Kittitas County include:
- Short-term rentals in agricultural zones — Operating a vacation rental or VRBO on rural agricultural land requires a CUP.
- Campgrounds and glamping facilities — The Cle Elum/Roslyn area's recreation market has driven significant interest in commercial camping operations, all of which require CUPs in non-commercial zones.
- Commercial event venues — Winery events, wedding venues, and farm-to-table dinner operations on agricultural land all fall under CUP requirements.
- Cluster subdivisions — Some rural subdivisions use a "cluster" configuration to preserve open space while achieving higher residential density; this generally requires a CUP plus a formal plat.
CUP timelines run 3–6 months from application to decision. The county can approve, approve with conditions, or deny. Conditions are binding on the property, not just the applicant — they run with the land and apply to future owners.
Real Development Examples
Looking at completed subdivisions in Kittitas County illustrates what's actually achievable at different scales.
Roslyn Ridge West — 61 Homes Near Cle Elum
Roslyn Ridge West is a residential subdivision near the Cle Elum/Roslyn corridor — one of the more active markets in Kittitas County due to Suncadia Resort's influence on recreational demand. The development sits in an RR-2.5 zone, which allowed lot sizes compatible with single-family homes on parcels just over 2.5 acres. Projects like this require formal long plat review given the lot count, along with road dedication and infrastructure improvements to county standards.
Wallace Ranch II — 72 Parcels
Wallace Ranch II is a larger rural land subdivision demonstrating what's achievable in agricultural transition zones when the land base is large enough. At 72 parcels, this scale requires a full formal subdivision process — SEPA environmental review, public hearing, engineering drawings for roads and drainage, and phased conditions of approval. Projects at this scale typically take 18–36 months from application to final recording and involve multiple coordinated professionals.
What zone is your Kittitas County parcel?
Look up any parcel's zone, acreage, and development constraints for free at terravector.io. Or get a full $299 Feasibility Study with written analysis of what you can build, what permits you'll need, and what it will cost.
Free Parcel Lookup at terravector.io →Setbacks and Height Limits
Zone classification determines what you can build, but setbacks determine where on your parcel you can build it. Kittitas County's standard setbacks for rural zones:
| Zone | Front Setback | Side Setback | Rear Setback | Max Height |
|---|---|---|---|---|
| AG-20 / AG-40 | 50 ft from road centerline | 20 ft | 20 ft | 35 ft (residential) |
| RR-2.5 / RR-5 | 25–40 ft from right-of-way | 10–15 ft | 20 ft | 35 ft |
| RR-10 | 30 ft from right-of-way | 20 ft | 20 ft | 35 ft |
Agricultural structures (barns, equipment storage) may be exempt from some setback requirements or have modified standards — confirm specifics with the county before siting a new outbuilding.
Critical Areas: The Overlay That Changes Everything
Kittitas County's Critical Areas Ordinance (CAO) applies countywide as an overlay on top of base zone requirements. If your parcel contains or is adjacent to a critical area, you may face additional restrictions on building, grading, and vegetation removal — regardless of your base zone.
Critical areas in Kittitas County include:
- Wetlands — Common in low-lying areas of the Kittitas Valley; mapped by the county and by the National Wetlands Inventory. Buffers of 25–200 ft apply depending on wetland category.
- Floodplain (100-year) — FEMA flood maps designate much of the lower Yakima River corridor as Zone AE (special flood hazard area). Building in the floodplain requires an elevation certificate and potentially a floodplain development permit.
- Steep Slopes — Slopes exceeding 40% are classified as critical areas. Geotechnical review may be required before building permits are issued.
- Fish and Wildlife Habitat — Riparian corridors along streams and rivers supporting salmon or steelhead have buffer requirements that can significantly constrain buildable area.
What to Check Before Buying or Developing
Before committing money to a Kittitas County land purchase or development project, confirm these four things:
- Zone designation and minimum lot size — Determines whether your subdivision concept is even possible.
- Critical area overlay — A parcel that looks developable on paper may have substantial setback and buffer requirements that eliminate usable area.
- Water rights or access to municipal water — Many rural Kittitas County parcels have limited or no adjudicated water rights for new wells. Check with the Washington Department of Ecology.
- Road access and legal frontage — Confirm every proposed lot would have legal access to a public road, either directly or via recorded easement.
For a systematic look at these factors for your specific parcel, see our $299 Feasibility Study, which covers zoning, water/septic viability, cost estimates, and next steps. Or check subdivision costs in our guide: How Much Does It Cost to Subdivide Land in Washington State?