Where to Find Agate in Washington
Washington agate is dominated by Ellensburg blue, a soft cornflower-blue chalcedony found in dry gulches between Ellensburg and the Saddle Mountains in Kittitas County. The Saddle Mountain area also produces picture jasper and brown sagenite agate in basalt amygdules. Lake Goodwin and Damon Point on the Olympic Peninsula yield tide-tumbled agate and carnelian, and the Brewster terraces of the Columbia River basin add float agate eroded from older volcanic sources. Ellensburg blue is the prize, and surface collecting on private ranch ground is closed to the public; legal access concentrates on Department of Natural Resources land.
Spot list checked against source data on April 1, 2026.
Map of 21 agate collecting spots in Washington
Best counties for agate in Washington
Ranked by the number of mapped agate spots. County links open the full rockhounding page for that county.
- Clallam County5 spots
- Lewis County4 spots
- Pacific County3 spots
- Jefferson County2 spots
- Kittitas County2 spots
- Cowlitz County1 spot
- Franklin County1 spot
- Grays Harbor County1 spot
- Klickitat County1 spot
- Skamania County1 spot
Every agate spot we track in Washington
Sorted by county. Coordinates open in Google Maps.
Before you go
Read the agate identification guide so you know what a keeper looks like in the field: Agate in the encyclopedia.
Agate in Washington FAQ
Where can you find agate in Washington?+
How many agate spots are mapped in Washington?+
Is it legal to collect agate in Washington?+
Where else to find agate
More minerals to hunt in Washington
Hunt agate in Washington 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.
