Mushroom Rock State Park preserves a collection of seven large sandstone concretion boulders in Ellsworth County, north-central Kansas, approximately three miles north of Brookville off K-141. At just under five acres, it is one of the smallest state parks in Kansas, but the geological curiosity of the formations — some resembling giant mushrooms, others broad tabletop sandstone pedestals perched on narrow eroded stems — draws visitors from across the central part of the state. An informal nature walk circling all seven formations covers approximately 0.5 miles on flat prairie terrain, typically requiring 30 to 60 minutes at a leisurely pace.
Access requires a private vehicle. Mushroom Rock is signed from K-141 via a short road leading to a small off-road parking area directly adjacent to the formations. A Kansas State Parks vehicle permit ($5 per day) is required and available online at ksoutdoors.com or at the self-pay station at the site. No facilities exist at the park itself — no restrooms, no water, and no shade. The site is best combined with a visit to Kanopolis State Park, approximately three miles to the northeast, where full campground and day-use facilities including restrooms and drinking water are available. From Salina, Mushroom Rock is approximately 25 miles southwest via I-135 South and K-141, allowing about 30–35 minutes driving time.
The concretion formations were created during the Cretaceous period when iron-rich minerals cemented sand grains around organic nuclei through a process called diagenesis — the same geological forces responsible for the broader Dakota sandstone landscape visible throughout north-central Kansas. The largest formation at Mushroom Rock State Park measures approximately 27 feet in diameter and is considered one of the largest natural concretions documented in Kansas. The formations rest on softer Dakota sandstone pedestals that erode at different rates, gradually undercutting the harder concretions and producing the distinctive mushroom silhouette. The park is listed as a National Natural Landmark in recognition of its geological significance. The surrounding grassland prairie supports wildflowers from May through June, including annual sunflowers and prairie coneflower. Sunrise and sunset light casts warm amber tones across the tan sandstone that make the formations especially photogenic in low-angle light.
Trail facts
- Trail area
- Ellsworth County
- Best season
- Year-round; wildflowers May–June; golden light at sunrise and sunset
What to bring
- Comfortable shoes
- Water
- Camera (unique geological formations)
- Download directions offline
Location
Ellsworth County, KS (off K-141 near Brookville, KS 67425)
38.7024, -98.3498 View on map
Highlights
- Seven Cretaceous sandstone concretions including a 27-foot diameter boulder — among the largest known natural concretions in Kansas
- Registered National Natural Landmark showcasing unusual diagenesis geology on the north-central Kansas plains
- Half-mile informal loop visits all formations in 30–60 minutes — ideal as a short scenic stop
- Three miles from Kanopolis State Park, enabling easy combination into a full day trip
Tips for visiting
- Combine the visit with Kanopolis State Park (3 miles northeast) to access restrooms, water, camping, and additional hiking trails
- Arrive at sunrise or late afternoon for warm amber light on the tan sandstone formations — the lighting at midday is flat
- Download offline directions before departing Salina or Brookville — cell service can be limited along K-141 near the park
- Bring all water needed; no facilities of any kind are available at the park itself
When to visit
Year-round access is possible; May through June brings wildflowers in the surrounding grassland, and sunrise and late-afternoon lighting produce the best photographic results on the formations at any time of year. The site can be visited in under an hour, making it practical as an add-on to a Kanopolis State Park day.
Accessibility
The informal nature walk around the formations crosses flat, natural prairie terrain. The ground surface is mostly level grass and compacted dirt suitable for walking, and wheelchairs and strollers may be able to navigate the loop in dry conditions. However, the path is not formally accessible — no hardened surface, accessible signage, or mobility infrastructure has been installed.
Frequently asked questions
Is there an entry fee for Mushroom Rock State Park?
A Kansas State Parks vehicle permit is required. Daily permits cost $5 per vehicle; annual passes are available through ksoutdoors.com.
How do visitors find Mushroom Rock State Park?
The park is approximately 3 miles north of Brookville off K-141 in Ellsworth County. Look for the signed turnoff from K-141. From Salina, allow 30–35 minutes via I-135 South and K-141.
Are restrooms available at the park?
No. No facilities exist at Mushroom Rock State Park. Restrooms and drinking water are available at Kanopolis State Park approximately 3 miles to the northeast, which is the recommended companion stop.
What are the concretion formations made of?
The formations are iron-rich sandstone concretions created during the Cretaceous period when minerals cemented around organic material in the sediment. Differential erosion of the softer surrounding rock over millions of years left the harder concretions standing above the prairie surface in their distinctive mushroom shapes.