Willamette Valley growers who want to wash, pack, press, dry or bottle their own crops on the farm face a state question before a county one. Oregon law allows farm product processing on exclusive farm use (EFU) land, but only inside firm limits on processing floor area and crop source. Get those two numbers right and the path is short; miss them and the project moves into a harder review.
Why the state sets the rules here
Farm parcels across the valley are commonly zoned exclusive farm use. In EFU zones, ORS chapter 215 and the state rules in OAR 660-033 set the menu of allowed uses, and counties such as Marion, Polk, Yamhill, Linn, Benton and Lane apply that menu through their own codes. A county can add siting standards, but it cannot approve a use the state does not allow.
What qualifies as an on-farm processing facility
ORS 215.283(1)(r), and ORS 215.213(1)(u) in marginal lands counties, allow a facility for the processing of farm products as described in ORS 215.255. OAR 660-033-0130(28) sets the tests:
Crop source: at least one quarter of the farm crops processed come from the farm operation that contains the facility. Biofuel production from farm crops counts.
Poultry and rabbits: slaughtering and processing from the farm operation qualifies when it fits the state licensing exemption in ORS 603.038(2).
Size: the processing area is under 10,000 sq ft and the facility meets the county’s applicable siting standards, which cannot be applied in a way that blocks it.
Small facilities: under 2,500 sq ft, the facility is allowed notwithstanding most siting standards. Floodplain, geologic hazard, airport safety and fire siting standards still apply.
Land division: no partition may separate the facility from the farm operation it serves.
Processing area means the floor area of the building dedicated to processing. Space for preparation, storage or other farm use does not count. A larger barn can still qualify when the processing floor itself stays under the limit, so the floor plan, not the footprint, decides the outcome.
When it becomes a commercial activity instead
If more than three quarters of the crops come from other farms, the operation is not a 215.255 facility. It may still fit as a commercial activity in conjunction with farm use under ORS 215.283(2)(a), which the state use table lists as allowed only after required review on both high-value and other farmland. Marion County treats it as a conditional use under MCC 17.136.050(D)(2). The applicant must show the activity is primarily a customer or supplier of farm uses, enhances local farming and provides products or services essential to agriculture, and must also show it will not force a significant change in, or raise the cost of, accepted farm practices nearby.
How a county reviews it
Even the on-farm facility is a land use decision. The state use table marks it as a use that may be allowed after required review, with notice and an opportunity for a hearing. In Marion County, MCC 17.136.040(F) makes it subject to approval by the planning director, with the one-quarter rule, the 10,000 sq ft processing cap and the land division bar written into the code. Sequence the work: land use approval first, then the building permit, then state licensing tied to the finished space.
The food safety side
Zoning approval does not license the food. The Oregon Department of Agriculture issues a Food Processing license for the production or storage and distribution of food. ODA’s Farm Direct rules exempt some producer-processed products: acidic foods such as jams, jellies, syrups, juices and processed fruits and vegetables, made from principal ingredients the farm grows, processed where they were grown and sold directly to the end consumer. Once annual sales of those products pass $50,000, an ODA license is required.
What changes on 01-01-2027
HB 4153 (Oregon Laws 2026, chapter 123) adds farm stores as a permitted use in EFU zones starting 01-01-2027. A farm store sells farm products from the operation that runs it, may use up to 10,000 sq ft of permanently enclosed structures, may sell processed farm products from the local agricultural area, may serve prepared food from a licensed kitchen and limits other retail items to 25 percent of the floor area. Minimum acres in farm use apply by tract size.
HB 4130 (chapter 115) lets land under a processing facility, and adjacent land used with it, qualify for farm use special assessment for property tax years beginning on or after 07-01-2027. The owner must show the facility meets the processing facility definition.
What to check before you design
Confirm the zone and whether the parcel is high-value farmland. Document where the crops come from. Lay out the processing floor separately from storage and prep space, and measure it. Check floodplain, access, water, septic and fire siting early, because hazard and fire standards apply even to the smallest facility. If retail is part of the plan, decide whether a farm stand now or a farm store after 01-01-2027 fits the operation better.
How SASHKOV helps
SASHKOV reads the parcel against ORS 215.255 and the county EFU code before anyone draws, then prepares the land use application and the permit set. That work sits under Land Use and Entitlements, and the wider picture is on the Food Processing market page and the Willamette Valley region page. Where a building needs a licensed architect or engineer, SASHKOV brings them into the contract and carries the permit through county review.
Planning to process on a valley farm? Send the parcel and what you want to process, and SASHKOV will confirm the path and what the county will want to see.
Frequently Asked Questions
Can I build a processing facility on EFU land in Oregon?
Yes, if at least one quarter of the farm crops processed come from the farm operation that contains the facility and the processing area is under 10,000 sq ft, meeting the county’s applicable siting standards. Under 2,500 sq ft, most siting standards fall away, though floodplain, geologic hazard, airport and fire standards still apply.
What counts toward the 10,000 square foot limit?
Only the floor area dedicated to processing. Space for preparation, storage or other farm use is not counted, so a larger farm building can still qualify when its processing floor stays under the limit.
What if most of the crops come from other farms?
Then it is not an on-farm processing facility under ORS 215.255. It may still be approved as a commercial activity in conjunction with farm use, which is a conditional use with stricter criteria, such as showing the activity mainly serves farm uses and is essential to local agriculture.
Do I need an ODA license to process on the farm?
Usually. The Oregon Department of Agriculture licenses food processing. Farm Direct rules exempt some acidic producer-processed products, such as jams, juices and processed fruits and vegetables made from crops the farm grows and sold directly to consumers, until annual sales of those products pass $50,000.
Sources
Insights are general information researched from published sources on the date shown. Rules change, so confirm with the permitting authority before you act.
