Where to Find Geodes in Pennsylvania: 4 Mapped Sites
Pennsylvania has 4 documented sites where geodes have been reported, and the best-known are North Vandergrift, Crystal Cave, and Grubb Lake and Mud Lake. Every site is mapped below with GPS coordinates and links to a full report of access and what's been found there. 4 of the 4 sites are on public-access land.
Last updated: — data compiled by the Rockhounding.org Research Team · methodology
Geodes Map: Pennsylvania
All 4 geodes sites in Pennsylvania. Click a pin for the full site report.
Where Geodes Are Found in Pennsylvania
Geodes form in gas pockets in basalt and in dissolution cavities in limestone, then weather out into creeks and slopes. Look in streambeds and roadcuts through limestone country.
The richest reported sites in Pennsylvania: North Vandergrift, Crystal Cave, Grubb Lake and Mud Lake, Upland.
Of the 4 sites, 4 are public access. Check each site report for current land status before you go.
All Geodes Sites in Pennsylvania
- North Vandergrift — Public Access
- Crystal Cave — Public Access
- Grubb Lake and Mud Lake — Public Access
- Upland — Public Access
How to Identify Geodes
A geode is a round or oblong nodule with a bumpy, cauliflower-textured shell that feels noticeably light for its size — the hollow interior gives it away. Some rattle when shaken. Crack one open and the cavity is lined with inward-pointing quartz or calcite crystals; a solid, heavy nodule is more likely a concretion.
Not sure what you found? Try our identification guide →Frequently Asked Questions
Where can I find geodes in Pennsylvania?
Pennsylvania has 4 mapped sites where geodes have been reported. The best-known are North Vandergrift, Crystal Cave, and Grubb Lake and Mud Lake. Each listing on the map above includes GPS coordinates, access type, and what has been found there.
How many geodes sites are mapped in Pennsylvania?
We have 4 documented geodes sites in Pennsylvania, compiled from community submissions and published locality records and reviewed by the Rockhounding.org Research Team.
Is it legal to collect geodes in Pennsylvania?
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 geode?
A geode is a round or oblong nodule with a bumpy, cauliflower-textured shell that feels noticeably light for its size — the hollow interior gives it away. Some rattle when shaken. Crack one open and the cavity is lined with inward-pointing quartz or calcite crystals; a solid, heavy nodule is more likely a concretion.
What should I bring to collect geodes?
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.
Data: community submissions — reviewed and approved by the Rockhounding.org Research Team. Always verify current land status, regulations, and access before visiting any site.