Washington County Parks and THPRD (Tualatin Hills Park & Recreation District) parks close from dusk to dawn or 10 PM depending on the site. Violations constitute trespass under ORS 164.245. Metro-managed regional parks (Cooper Mountain, Tualatin River NWR) have posted hours.
Park hours in Washington County are governed by multiple agencies. Washington County Parks (Hagg Lake, Scoggins Valley Park) post hours varying by season — typically 7 AM to sunset, extended for boat launches during fishing season. THPRD — the Tualatin Hills Park & Recreation District serving 250,000 residents in Beaverton and surrounding unincorporated areas — operates under Oregon special district law (ORS 266); THPRD parks and natural areas open dawn to dusk with longer hours at lit sports fields and Conestoga/Aquatic/Recreation facilities. Metro regional parks in the county (Cooper Mountain Nature Park, Graham Oaks, Tualatin River NWR in Sherwood) follow Metro Code Chapter 5.04: generally sunrise to sunset for natural areas, longer for developed parks. City parks: Beaverton (BC 6.02, typically 5 AM-10 PM), Hillsboro (HMC 10.20, dawn-dusk or 10 PM), Tigard, Tualatin, and Sherwood all have posted schedules. After-hours presence is a Class B misdemeanor (ORS 164.245 trespass in the second degree) on public land OR a park-rule violation under the governing agency's code. Camping in non-designated areas prohibited. Off-leash dog areas (Hondo at Tualatin Hills Nature Park, others) have specific hours.
After-hours trespass: $50-$500 citation under agency code; criminal trespass II (ORS 164.245) up to $1,250/30 days. Unauthorized camping: $100-$500. Vandalism: separate criminal charges.
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