🌤 Weather at Lake Sylvia State Park by season
| Spring | Summer | Fall | Winter |
|---|---|---|---|
| 37–64 °F | 51–77 °F | 38–70 °F | 35–50 °F |
Each range runs from the coldest monthly average low to the warmest monthly average high in that season (1991-2020 climate normals), measured at Snoqualmie Falls, 21 mi away, elevation 440 ft. Conditions at the park can differ from the station, especially where elevation differs — check a forecast before you go.
Lake Sylvia State Park is a public state park in Washington in Grays Harbor County. Spanning 252 acres and established in 1936, this park offers a peaceful retreat into nature for visitors of all ages.
Quick Facts
| State | Washington |
| County | Grays Harbor |
| Park Size | 252 acres |
| Established | 1936 |
| Accessibility |
|
Things to Do
Lake Sylvia is a lumber town’s leftover turned into Montesano’s front yard: the lake began as a log pond when the Sylva Mill — Grays Harbor County’s first sawmill — started cutting on July 4, 1871, and a 1918 concrete buttress dam raised it 16 feet into the shape you paddle today. Gas motors are banned, so the water belongs to kayaks, canoes and paddleboards (bring your own — the park store no longer rents them, and since August 2025 the launch is closed to trailered boats while a dam-safety project runs). The creek-fed lake is stocked with rainbow trout every year, with an ADA fishing dock and a wooden rail-trail bridge that skims the surface — the brochure’s own tip for a sunny-day fishing spot. A roped sandy swim beach (no lifeguard) rounds out the shore.
Five miles of hiking and biking trail loop the lake and creek, plus a half-mile accessible trail from the fishing dock, and the park’s paths connect straight into the 5,000-acre Montesano City Forest trail network next door. The two kitchen shelters and the bathhouse are Works Progress Administration work from the 1930s — the WPA, not the CCC, built here — and the newer Legacy Pavilion, with its glass walls and stone fireplace, is the park’s wedding venue.
Best Time to Visit
Campsites are reservable April 1 through September 30 and first come, first served November through March; spring trout stocking and summer swimming define the high season, while the forest trails work in any month on the Olympic Peninsula’s mild south side. The day-use area opens at 8 a.m. year-round until dusk. Note the park’s dam-safety project: the lake has been drawn down about 5 feet as a precaution and the trailer launch stays closed — the park itself, including swimming, paddling, fishing and camping, remained open at the time of writing, but check the park page for current alerts.
Visitor Tips
A Discover Pass is required — $10 per day or $45 per year. The campground has 31 standard sites, 3 partial-utility sites, 4 walk-in sites and 2 hiker/biker sites ($12), with hot showers and a $5 dump station; statewide rates run $31–$43 for standard and $41–$51 for partial-utility sites in peak season, bookable 9 months ahead — as of September 2026. A group camp holds 25 to 60 (tents only), and the Legacy Pavilion seats 60 for $150–$450 depending on day and season. Dogs are welcome on leash.
The park sits at 1812 N. Lake Sylvia Road, just north of downtown Montesano, “halfway between Olympia and the Pacific Coast” in the park’s own description (360-249-3621). Montesano bought the logged-off watershed in 1931 for $12,000 and deeded 234 acres of it to the state on October 23, 1936 — which is why a city forest and a state park share a trail map.
Fees, alerts and facility details verified against parks.wa.gov on September 2, 2026. Conditions change — confirm before you travel.
Explore More Washington State Parks
Lake Sylvia State Park is one of many outstanding state parks in Washington. Discover more parks in our Best State Parks in Washington guide, or use our Park Finder to search by activity, location, or features.
Wildlife & Nature
Lake Sylvia State Park — 233 acres on Lake Sylvia in Grays Harbor County — sits in a former logging camp setting surrounded by second-growth forest that has regrown since the early 1900s. The 33-acre lake provides swimming, non-motorized boating, and fishing for rainbow trout and largemouth bass. Bald eagles and osprey patrol the lake. Great blue herons fish from the dam spillway. Black-tailed deer browse in the forest. The park’s trails follow old logging roads and railway grades — the 5-mile trail system connects to the city of Montesano.
Nearby Attractions
Montesano — adjacent — is the Grays Harbor County seat with the historic courthouse. Aberdeen — 10 miles southwest — is the birthplace of Kurt Cobain. Westport — 30 miles southwest — has whale-watching tours. Grays Harbor National Wildlife Refuge — 15 miles southwest — hosts massive spring shorebird migrations.
More parks in Washington: Schafer State Park and Bottle Beach State Park. See the full Washington state parks guide.
🐾 Dogs & Pets at Lake Sylvia State Park
- Pets allowed? statewide rule
- Pets are allowed in most Washington state parks but must be under physical control on a leash at all times.
- Leash rule statewide rule
- 8 ft maximum leash required; pets must be under physical control
- Beaches & swim areas statewide rule
- Pets are not permitted on designated swim beaches
- Cabins & lodging statewide rule
- Pets are not allowed inside vacation houses but are permitted in designated pet-friendly cabins and yurts (e.g. Grayland Beach, Seaquest, Ike Kinswa — Cape Disappointment does NOT allow pets in its yurts), typically up to two pets, with a pet fee
- Pet fees statewide rule
- No day-use pet fee; $15 per night pet fee in pet-friendly cabins/yurts
- Statewide exceptions statewide rule
- Director-designated off-leash areas are exempt from the leash rule and are conspicuously posted
Are dogs allowed at Lake Sylvia State Park?
Pets are allowed in most Washington state parks but must be under physical control on a leash at all times. Individual parks can post stricter rules — check signage on arrival.
Rules verified July 2026 via parks.wa.gov. More: Washington state parks guide · Dog rules in all 50 states compared
Park Location
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