John Boyd Thacher State Park

🦴 Trusted Guide to New York’s Ancient Fossil Cliffs – Updated 2025

Walking Along the World’s Richest Fossil Cliffs

Just 15 miles southwest of Albany, John Boyd Thacher State Park stretches across 2,155 acres atop the Helderberg Escarpment — six miles of dramatic limestone cliffs that host one of the richest fossil-bearing formations in the world. Embedded in the cliff face are the remains of an ancient tropical sea: brachiopods, corals, crinoid stems, trilobites, and cystoids from 400 million years ago. The park’s legendary Indian Ladder Trail descends beneath these cliffs, passing seasonal waterfalls and cave openings while panoramic overlooks above reveal views stretching to the Adirondacks, Green Mountains, and Taconic Range.

Indian Ladder Trail

The park’s signature experience is the Indian Ladder Trail — a path carved along the escarpment’s base that puts you face-to-face with limestone cliffs layered with visible fossils. Seasonal waterfalls cascade over the cliff edge, and small caves punctuate the rock face. The trail is typically open May through mid-November (weather-dependent). Named for the log ladders that Mohawk people used to climb the escarpment, this trail is unlike anything else in New York State.

25+ Miles of Trails

• Escarpment Trail: Ridge-top hike with sweeping views of the Hudson-Mohawk Valley
• Paint Mine Trail: Follows an old iron ore mine through diverse forest
• 25+ miles total: Routes for hiking, mountain biking, cross-country skiing, and snowshoeing
• Emma Treadwell Thacher Nature Center: Interactive exhibits on geology and ecology at nearby Thompson’s Lake

Practical Tips

• From Albany (15 miles): Take Route 85 West to Route 157 to the main entrance
• Entry fee: $8 per vehicle (seasonal — late spring through fall)
• Indian Ladder Trail is open May to mid-November — check ahead for weather closures
• The escarpment cliffs are unfenced — keep children close and stay back from cliff edges
• Fossil collecting is prohibited — observe and photograph only
• Fall foliage (October) combined with the cliff views creates one of New York’s finest autumn experiences
• Combine with Thompson’s Lake State Park (adjacent) for camping and swimming

Written by

State Parks Team

Editorial Team

The America's State Parks Editorial Team has collectively explored 800+ state parks across all 50 states. Our park profiles are carefully researched using official state park data, verified visitor information, and first-hand observations from our writers and contributors. Each article is fact-checked against official sources and updated regularly to ensure accuracy. Our mission is to help every American discover the natural wonders in their own backyard.

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