Rosaryville State Park
Also known as Mount Airy Mansion
- Status
- Open (per official listing)Daily 8 a.m. – sunset
- Entrance fee
- $3 per person ($5 nonresident)Annual pass available
- Day-use reservations
- None mentioned
- Dogs
- Dogs allowed
- Camping
- None listed
- Official site
- dnr.maryland.gov(301) 888-1410
Official page last checked Oct 29, 2026. How we keep this current
Overview
Covering about 982 acres, Rosaryville State Park lies in Prince George's County, about 7 miles southeast of District Heights.
Hours
Park, gate, office and facility hours are listed separately because they often differ. Alerts above override normal hours.
| Facility | Days | Hours | Season |
|---|---|---|---|
| Park | Not stated | 8 a.m. – sunset | — |
| Park | Daily | 8 a.m. – sunset | — |
Official wording
8 a.m. to sunset
Day-Use Fees: $3 for Maryland residents, $5 for out-of-state. The charge is per vehicle Monday - Friday, and per person on weekends and holidays. The automated toll gate accepts credit/ debit card and cash ($1 and $5 only). All Maryland State Park passes are accepted by the automated toll gate.
Hours of operation (fees page): 8 a.m. to sunset
Source: official park page, checked Oct 29, 2026. Times are local to the park (America/New York).
Fees and passes
| Item | Amount |
|---|---|
| Day-use Admission Fee: April-October: Weekends and holidays: Maryland residents (resident) | $3 · person |
| Day-use Admission Fee: April-October: Weekends and holidays: Maryland residents (nonresident) | $5 · person |
| Weekdays: Maryland residents (resident) | $3 · vehicle |
| Weekdays: Maryland residents (nonresident) | $5 · vehicle |
| November-March: Maryland residents (resident) | $3 · vehicle |
| November-March: Maryland residents (nonresident) | $5 · vehicle |
| $200 per day | $200 · day |
Official wording
Hours of Operations: 8 a.m. to sunset Day-use Admission Fee: April-October: • Weekends and holidays: Maryland residents $3/person; out-of-state residents $5/person • Weekdays: Maryland residents $3/vehicle; out-of-state residents $5/vehicle November-March: • Maryland residents $3/vehicle; out-of-state residents $5/vehicle Shelter: Shelter 1 & 2 closed 7/1 - 8/15/2025 for renovations and paving project Capacity: 200 people Charge: (Base rate does not include transaction or other applicable fees) $200 per day
Maryland park passes
- Maryland State Park and Trail Passport (annual) — $75 resident / $100 non-resident. Unlimited day-use entry for everyone in the vehicle (up to 10 people), unlimited boat launching, 10% concession discount Details
- Golden Age Pass (62+) — $10 processing fee, lifetime. Free day-use entry, half-price camping Sun–Thu, waived boat launch fees Details
- Universal Disability Pass. Free lifetime entrance to DNR public lands for holder + one person Details
- Youth Group Pass. Youth-group day use (not peak weekends) and youth group camping; valid two years Details
From the Maryland state guide. Confirm which passes this park accepts.
Reservations
- Day use
- No day-use reservation requirement mentioned
- Booking system
- Maryland State Park Reservation Service (parkreservations.maryland.gov); day use via parkdayuse.maryland.gov
- Phone
- 888-432-2267
We link to the official booking system rather than showing live availability, which changes minute to minute.
Pets
Dogs allowed
Pets are allowed in Rosaryville State Park except in the mansion area.
Service animals are generally permitted where pets are not. Check with the park for specific areas.
Getting there
- Address
- 7805 West Marlton Avenue
Upper Marlboro, MD 20772 - Nearest town
- District Heights — about 7 mi southeast (straight line)
- Coordinates
- 38.7742, -76.8111 (from Wikidata)
- Phone
- (301) 888-1410
- cedarville.statepark@maryland.gov
Google Maps directionsApple MapsOfficial park map (PDF)
Directions from the park
The entrance to Rosaryville State Park is on Route 301/Crain Highway.
Nearby state parks
Sources and freshness
- Maryland State Parks — park page — last checked Oct 29, 2026
- Maryland Park Service 'Find a State Park' directory (SharePoint HTML, links to /publiclands/Pages/{region}/{park}.aspx)
- Wikidata
- Photo: Historic American Buildings Survey John O. Brostrup, Photographer May 13, 1936 11-20 A.M. VIEW FROM SOUTHEAST (Greenhouse) - Mount Airy, Rosaryville, Prince George's County, MD HABS MD,17-ROSVI.V,2-15.tif — Public domain (US federal government work)
“Last checked” is when our system last read the official source. No change has been detected since this page was first published. Hours, fees and rules can change without notice — confirm with the park before you go. Methodology