Erinswood
Central CascadesBest Year-round
A short, barrier-free loop through old-growth cedar and fern-draped forest along the North Fork Skykomish, perfect for a quick leg stretch near Index.
About This Trail
Erinswood is a half-mile loop through some of the nicest low-elevation forest along the Highway 2 corridor. The trail winds beneath towering Douglas fir and western red cedar, with sword ferns, thimbleberry, and vine maple filling in the understory. You will hear the North Fork Skykomish River the entire time, and the forest floor stays damp and green year-round.
The trail was designed with accessibility in mind, and the grade stays gentle throughout with only minor rises and dips. It passes through riparian, deciduous, and evergreen habitat in a remarkably short distance, which makes it a surprisingly rich nature walk for something you can finish in 20 minutes. Look for varied thrush in the understory and dippers along the creek.
This is a perfect pairing with Heybrook Ridge, which shares the same parking lot. Do Heybrook for the workout and views, then walk Erinswood to cool down through the old growth. The parking area is free and holds about 20 cars, but fills up on weekends thanks to Heybrook's popularity. No restroom facilities on site.
Astronomy
Trail Conditions
“Both trails are in good shape, although a little brushy in some spots, especially under the power lines towards the second view point.”
Last report: Feb 15, 2026
Scorecard
Safety & Considerations
Today's Hazard
- Strong sun — sunscreen, hat, and sunglasses recommended
Persistent Hazards
- occasional blowdown across trail
- brushy sections under power lines
Getting There
Free parking at Heybrook Ridge County Park. About 20 spots. Fills up on weekends due to Heybrook Ridge traffic. No restrooms.
From US 2, turn north onto Index-Galena Road near the town of Index. The trailhead is at Heybrook Ridge County Park. The loop starts from the parking lot and is well-signed.
No timing strategy needed. Walk it anytime. Pairs well as a cooldown after Heybrook Ridge.
Recent Reports
Walked the Erinswood trail after coming down off Heybrook Ridge Sunday morning. This shares the parking lot with Heybrook and is free and pretty good sized but was full when we left about noon.
Both trails are in good shape, although a little brushy in some spots, especially under the power lines towards the second view point. The honey bucket in the parking lot is gone, so no bathrooms on this trail.
Walked the short Erinswood trail after coming down from Heybrook Ridge this morning. Parking at the main lot is free and fairly plentiful with about 20 spots.
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