Where to Find Petrified Wood in Wyoming: 14 Mapped Sites
Wyoming has 14 documented sites where petrified wood have been reported, and the best-known are Atlantic City, Sweetwater County, and Kemmerer. Every site is mapped below with GPS coordinates and links to a full report of access and what's been found there. 14 of the 14 sites are on public-access land.
Last updated: — data compiled by the Rockhounding.org Research Team · methodology
Petrified Wood Map: Wyoming
All 14 petrified wood sites in Wyoming. Click a pin for the full site report.
Where Petrified Wood Are Found in Wyoming
Whole forests were buried in volcanic ash and river sediment, silicified, and are now eroding out of badlands, bluffs, and gravel beds. Walk wash bottoms and eroding slopes in sedimentary country.
The richest reported sites in Wyoming: Atlantic City, Sweetwater County, Kemmerer, Warm Springs, Blacks Fork Creek.
Local reporting distinguishes Silicified Wood (10 sites), Agatized Wood (1 site).
Of the 14 sites, 14 are public access. Check each site report for current land status before you go.
All Petrified Wood Sites in Wyoming
- Atlantic City — Public Access
- Sweetwater County — Public Access
- Kemmerer — Public Access
- Warm Springs — Public Access
- Blacks Fork Creek — Public Access
- Buffalo — Public Access
- Farson — Public Access
- Red Desert — Public Access
- Rock Springs — Public Access
- Green River — Public Access
- Steamboat Mountain — Public Access
- Thorofare Wilderness — Public Access
- Crazy Woman Creek — Public Access
- Eden Valley — Public Access
How to Identify Petrified Wood
Petrified wood keeps the anatomy of wood in stone: growth rings on the ends, grain lines along the sides, knots and bark texture — but at hardness ~7 and several times the weight of wood. Weathered ends often show the ring structure best. Agatized pieces glow translucent at thin edges; palm wood shows rod-like dots instead of rings.
Not sure what you found? Try our identification guide →Frequently Asked Questions
Where can I find petrified wood in Wyoming?
Wyoming has 14 mapped sites where petrified wood have been reported. The best-known are Atlantic City, Sweetwater County, and Kemmerer. Each listing on the map above includes GPS coordinates, access type, and what has been found there.
How many petrified wood sites are mapped in Wyoming?
We have 14 documented petrified wood sites in Wyoming, compiled from community submissions and published locality records and reviewed by the Rockhounding.org Research Team.
Is it legal to collect petrified wood in Wyoming?
Casual collecting is generally allowed on BLM and National Forest land for personal, non-commercial use — the standard BLM limit is 25 lbs per day plus one specimen. National parks, monuments, and many state parks prohibit collecting, and private land always requires the owner's permission. Check the site report for each location and verify current land status before you dig.
How do I identify petrified wood?
Petrified wood keeps the anatomy of wood in stone: growth rings on the ends, grain lines along the sides, knots and bark texture — but at hardness ~7 and several times the weight of wood. Weathered ends often show the ring structure best. Agatized pieces glow translucent at thin edges; palm wood shows rod-like dots instead of rings.
What kinds of petrified wood are found in Wyoming?
Reports from Wyoming distinguish Silicified Wood (10 sites), Agatized Wood (1 site).
What should I bring to collect petrified wood?
The basics: a rock hammer, safety glasses, gloves, a bucket or padded bag for specimens, and a GPS app with the coordinates from this page. Add a spray bottle — wetting a stone makes color and banding far easier to judge in the field.
⚠️ Always verify current regulations, weather conditions, and access requirements before visiting any location. Information provided is based on community submissions and may not be current or accurate.
Petrified Wood in Nearby States
Data: community submissions — reviewed and approved by the Rockhounding.org Research Team. Always verify current land status, regulations, and access before visiting any site.