🌤 Weather at Washington Rock State Park by season
| Spring | Summer | Fall | Winter |
|---|---|---|---|
| 32–75 °F | 60–88 °F | 36–79 °F | 24–46 °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 Plainfield, 4 mi away, elevation 90 ft. Conditions at the park can differ from the station, especially where elevation differs — check a forecast before you go.
Revolutionary War Lookout — Where George Washington Watched British Troop Movements, 30-Mile Panoramic Valley Views, Watchung Mountains, Green Brook NJ
Washington Rock State Park is a state park in Green Brook Township, Somerset County, New Jersey, on the first Watchung Mountain. The park features a natural rock outcropping used by General George Washington in June 1777 to monitor British troop movements under General Howe, 30-mile panoramic views of the valley below (NYC skyline visible on clear days), one of NJ’s oldest state parks (established 1913), walking trails and picnic areas, and a monument commemorating the 1777 strategic lookout.
Washington Rock is where the Revolution’s intelligence war played out — in June 1777, General Washington climbed this Watchung Mountain outcrop to observe British General Howe’s forces moving through the valley toward Westfield. The 30-mile panoramic view gave Washington the strategic advantage to cut off the British retreat and prevent them from reaching the Continental Army’s supply depot.
Today, visitors enjoy the same commanding vista — on clear days, the New York City skyline is visible on the eastern horizon, and the Watchung Reservation spreads below in a forested panorama.
Things to Do
- Historic lookout — Washington’s 1777 vantage point
- Panoramic views — 30-mile valley vista
- Walking trails — Watchung Mountains ridgeline
- Picnic areas — shaded tables and shelters
- Photography — NYC skyline on clear days
- Revolutionary War history — monument, markers
Park Information
| Feature | Details |
|---|---|
| Location | Green Brook Twp, Somerset County, NJ |
| Established | 1913 — one of NJ’s oldest parks |
| Historic Event | June 1777 — Washington’s lookout vs. Howe |
| Views | 30-mile panorama, NYC skyline |
| Managed By | NJ Div. of Parks / Somerset County |
| Coordinates | 40.6132° N, 74.4733° W |
Frequently Asked Questions
Wildlife & Nature
Washington Rock SP — the lookout point where George Washington watched British troop movements across the plains below during the 1777 campaign. The park’s ridge-top views span 30+ miles to the Raritan Valley and beyond. Red-tailed hawks soar on the thermals. Migrating warblers pass in spring.
Nearby Attractions
Green Brook — adjacent. Watchung Reservation — 3 miles south. Plainfield — adjacent.
What is Washington Rock State Park NJ?
Washington Rock State Park in Green Brook Township, New Jersey, is a Revolutionary War historic site where General George Washington used a natural rock outcropping on the Watchung Mountains to monitor British troop movements under General Howe in June 1777. Established in 1913, it is one of New Jersey’s oldest state parks. The lookout offers 30-mile panoramic valley views, with the NYC skyline visible on clear days. Features walking trails, picnic areas, and a commemorative monument.
Last updated: May 2026
More parks nearby: Edison Memorial Tower is a short drive away, while Old Dutch Parsonage lies a short drive away.
🐾 Dogs & Pets at Washington Rock State Park
- Pets allowed? statewide rule
- Pets are allowed in NJ state parks and forests on leash but are prohibited from buildings, swimming beaches and non-designated campsites.
- Leash rule statewide rule
- Leash 6 feet or less, with the pet under physical control at all times.
- Beaches & swim areas statewide rule
- Pets are prohibited from swimming beaches and swimming waters statewide.
- Cabins & lodging statewide rule
- Pets are prohibited from cabins/lodging; the Pet Friendly Camping Program designates campsites at 13 areas (e.g. Round Valley all sites, Allaire 1-8, Bass River 1-85, Stokes 101-137) for up to two dogs or cats per permit.
- Pet fees statewide rule
- $5.00 per night additional charge for a pet-friendly campsite; no day-use pet fee.
- Statewide exceptions statewide rule
- Pet Friendly Camping requires current rabies vaccination with written proof at check-in; caged birds/reptiles only allowed inside RVs.
Are dogs allowed at Washington Rock State Park?
Pets are allowed in NJ state parks and forests on leash but are prohibited from buildings, swimming beaches and non-designated campsites. Individual parks can post stricter rules — check signage on arrival.
Rules verified July 2026 via dep.nj.gov. More: New Jersey state parks guide · Dog rules in all 50 states compared
Park Location
Plan your gear for Washington Rock State Park
From our editorial guides, matched to this park’s activities:
Top Tours & Activities Near Staten Island
from $30
from $20