Where to Find Petrified Wood in Montana
Montana has 15 mapped collecting spots that report petrified wood, spread across 11 counties. The largest share sits in Yellowstone County with 3 spots. 14 of the spots are on land mapped as publicly accessible.
Spot list checked against source data on April 1, 2026.
Every petrified wood spot we track in Montana
Best spotPryor MountainsBig Horn County, MontanaPermission required · Fossil, Agate, Chalcedony +2
CarbellaPark County, MontanaPublic access · Agate, Jasper, Petrified Wood +1- Jefferson RiverMadison County, MontanaPublic access · Agate, Chalcedony, Jasper +1
- MinerPark County, MontanaPublic access · Agate, Chalcedony, Jasper +1
- Mount BlackmoreGallatin County, MontanaPublic access · Agate, Chalcedony, Hyalite Opal +1
- Yellowstone River - Black Bridge Boat LaunchDawson County, MontanaPublic access · Montana Moss Agate, Petrified Wood, Jasper +1
- Yellowstone River - Blue Creek AccessYellowstone County, MontanaPublic access · Montana Moss Agate, Petrified Wood, Jasper +1
- Yellowstone River - Bratten Fishing AccessSweet Grass County, MontanaPublic access · Montana Moss Agate, Petrified Wood, Jasper +1
- Yellowstone River - Bundy Bridge Fishing AccessYellowstone County, MontanaPublic access · Montana Moss Agate, Petrified Wood, Jasper +1
- Yellowstone River - Holmgren Fishing AccessStillwater County, MontanaPublic access · Montana Moss Agate, Petrified Wood, Jasper +1
- Yellowstone River - Laurel Sportsman AccessYellowstone County, MontanaPublic access · Montana Moss Agate, Petrified Wood, Jasper +1
- Yellowstone River - Myers Bridge AccessTreasure County, MontanaPublic access · Montana Moss Agate, Petrified Wood, Jasper +1
- Yellowstone River - Pelican Fishing AccessSweet Grass County, MontanaPublic access · Montana Moss Agate, Petrified Wood, Jasper +1
- Yellowstone River - Rosebud AccessRosebud County, MontanaPublic access · Montana Moss Agate, Petrified Wood, Jasper +1
- TerryPrairie County, MontanaPublic access · Petrified Wood, Chalcedony, Jasper
Standout petrified wood spots in Montana
Hand-picked from the full list above, with the reason each one earns a trip.
Best counties for petrified wood in Montana
Ranked by the number of mapped petrified wood spots. County links open the full rockhounding page for that county.
- Yellowstone County3 spots
- Park County2 spots
- Sweet Grass County2 spots
- Big Horn County1 spot
- Dawson County1 spot
- Gallatin County1 spot
- Madison County1 spot
- Prairie County1 spot
- Rosebud County1 spot
- Stillwater County1 spot
- Treasure County1 spot
Before you go
Read the petrified wood identification guide so you know what a keeper looks like in the field: Petrified Wood in the encyclopedia.
Petrified Wood in Montana FAQ
Where can you find petrified wood in Montana?+
The mapped spots concentrate in Yellowstone County, Park County, and Sweet Grass County. Every spot on this page is on the map, and each spot's own page has its coordinates and access notes.
How many petrified wood spots are mapped in Montana?+
15 spots across 11 counties. The RockHoundR app keeps the same spots on an offline map with public land overlays, geology layers, and your saved finds.
Is it legal to collect petrified wood in Montana?+
Hand collecting of common rocks and minerals in small amounts for personal use is generally allowed on BLM and U.S. Forest Service land, with limits set by the local field office. National parks, most state parks, and tribal land are closed to collecting. 14 of the 15 mapped spots here sit on land marked public. Always confirm current rules with the managing agency before you dig.
Where else to find petrified wood
More minerals to hunt in Montana
Hunt petrified wood in Montana with the map in your pocket
RockHoundR puts these spots on an offline map with BLM and Forest Service overlays, geology layers, and a log for your finds.
