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Photo: Nursery Web Spider - Pisaurina mira, St. Mary's River State Park, Leonardtown, Maryland - Flickr - Judy Gallagher by Judy Gallagher (CC BY 2.0) License

St. Mary's River State Park

State park · Leonardtown, Maryland

Hot — visit earlyPublic restroomWheelchair accessible entranceWheelchair accessible parking lot

Popular destination for lake fishing, hiking, biking, horseback riding & hunting (by permit).

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Weather at St. Mary's River State Park

H: 97° L: 72°
Partly Cloudy
Partly Cloudy
88°
|
Feels like 93°
Precipitation
71%
Humidity
53%
Wind
10 mph
UV Index
0.2
Water Conditions:
🏊Perfect for swimming
12 AM
Clear
74°
3 AM
Clear
73°
6 AM
Clear
73°
9 AM
Sunny
81°
12 PM
Cloudy
86°
3 PM
Sunny
97°
6 PM
Sunny
92°
9 PM
Heavy rain at times
76°

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Frequently asked questions

Where is St. Mary's River State Park?
St. Mary's River State Park is a state park in Leonardtown, Maryland.
Can you swim at St. Mary's River State Park?
There is no fixed answer for St. Mary's River State Park: whether it is safe to swim there on a given day depends on the water temperature, recent rainfall, and any advisories posted at St. Mary's River State Park in Leonardtown, Maryland. Check current water conditions before you go, and follow posted signs and local guidance.
How is St. Mary's River State Park rated?
St. Mary's River State Park in Leonardtown, Maryland has an average visitor rating of 4.6 out of 5, based on 509 reviews.

Visitor Reviews

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Been here? A quick note helps the next visitor plan their day. Handy things to mention:

Water temperatureCrowds & parkingBest time to goSafety & access

Best Times to Visit

☀️
Right Now
Very warm - visit early morning or evening
General Tips:
  • Weekday mornings (8–10 AM) are typically less crowded
  • Check the forecast 2–3 days ahead for best planning
  • Avoid holiday weekends for a quieter experience
Best Seasons:
☀️ Summer (Jun-Aug)🍂 Fall (Sep-Nov)🌸 Spring (Mar-May)

Location & Contact

21250 Camp Cosoma Rd, Leonardtown, MD 20650

Leonardtown, Maryland 20650

Popular Times

Monday
Morning
6a
7a
8a
9a
10a
11a
Afternoon
12p
1p
2p
3p
4p
5p
Evening
6p
7p
8p
9p
10p
11p
Not busy
Moderate
Busy
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People Talk About

💬 trail💬 lake💬 walk💬 hiking💬 fishing💬 biking💬 kayaking💬 jogging💬 bathrooms💬 playground

Highlights

Picnics

Accessibility

Wheelchair accessible entranceWheelchair accessible parking lot

Amenities

🚻 Public restroom🏪 Slides🏪 Swings

Family & Children

👶 Good for kids👶 Kid-friendly hikes👶 Playground