National park · United States
Patapsco Valley State Park
Enter Patapsco Valley State Park for free; hike the Swinging Bridge trail in under 2 h for $2 parking, or spend a day on the Patapsco River loop in spring‑fall; avoid July‑August heat.
- Source checked
- A source and a date are on record: we read it from an official or published page. Not yet confirmed on the ground.
- Field checked
- Someone checked it on the ground, with the date shown.
- Plan calculated
- Worked out by Voykit from its own data (times, distances, budgets). A calculation, not a measurement.
Unknown times stay unknown. How we verify
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Map to the park
Add your hotel to get directions from it. · stays in this browser; shared with the pocket card.
Area
80 km² (31 sq mi)31 sq mi (80 km²)
approximate
Established
1907
Best months
Mar–May, Sep–Oct
UNESCO
None
Rules in force · 7Crossing between the US, Canada and Mexico by land needs …Cannabis is legal in Canada and in many US states, but ta…
- North America ↗Crossing between the US, Canada and Mexico by land needs your passport even on a day trip; rental cars need the company's written permission to cross, and most US and Canadian rental insurance stops at the Mexican border.
- North America ↗Cannabis is legal in Canada and in many US states, but taking any amount across the US, Canadian or Mexican border is a federal crime — including edibles and vapes.
- North America ↗The busiest US and Canadian national parks need timed-entry, campsite or lodge reservations in summer; release dates are months ahead.
- United States ↗Check whether you need an ESTA (Visa Waiver Program) or a visa on the official CBP and State Department sites; apply only through esta.cbp.dhs.gov, not third-party sites, and allow time before you book.
- United States ↗Several popular national parks use timed-entry or vehicle reservations in peak season; check each park's page on nps.gov and book on recreation.gov before fixing your dates.
- United States ↗Medical care is very expensive for visitors; buy travel insurance with high medical cover before you fly.
- United States ↗Tipping is expected: about 15–20% at sit-down restaurants and bars, and a tip for taxis, hotel staff and guides.
At a glance
- Country
- United States
- Area
- 80 km² (31 sq mi)31 sq mi (80 km²)
- Park covers about 80 km² of river valley, forest and historic sites; figures may vary slightly between sources.
- Established
- 1907
- Best months
- Mar–May, Sep–Oct
- Permits
- Not needed
- Base
- Ellicott City
Patapsco Valley State Park spans the Patapsco River corridor between Baltimore and Washington, D.C., offering river walks, historic bridges, and campgrounds within a short drive of urban centers.
Decide
Why go, which months, and what lives here when
At a glance
Status
- No UNESCO listing; national park since 1907.
Size and age
80 km² (31 sq mi)31 sq mi (80 km²) · national park since 1907
Park covers about 80 km² of river valley, forest and historic sites; figures may vary slightly between sources.
This page covers the park itself. Nearest base: Ellicott City.
Why go
- Large river‑valley park between Baltimore and Washington, D.C., with historic bridges and river trails.
- Multiple short hikes suitable for families and day‑trippers.
- Campsites and cabins for overnight stays within a short drive of major cities.
When to go
- JanGo
- FebGo
- MarBest
- AprBest
- MayBest
- JunCaution
- JulAvoid
- AugAvoid
- SepBest
- OctBest
- NovGo
- DecGo
- JanCool, low crowds
- FebCool, occasional rain
- MarMild, wildflowers
- AprPleasant, full trail access
- MayWarm, low heat
- JunHeat rises, thunderstorms
- JulHot, humid, crowds
- AugHot, humid, thunderstorms
- SepCooler, dry
- OctMild, foliage
- NovCool, fewer visitors
- DecCool, occasional frost
Wildlife and nature calendar
| What | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| White‑tailed deer, raccoons, songbirdsAll year | yes | yes | yes | yes | yes | yes | yes | yes | yes | yes | yes | yes |
| Turtles (river)Mar–Oct | no | no | yes | yes | yes | yes | yes | yes | yes | yes | no | no |
Arrive & move
Getting in, how the park is divided, and where things are
Show 3 sectionsHideHow to get there, Zones and sectors, Sketch map
How to get there
From Baltimore
Take I‑95 north to US‑40 (Baltimore National Pike) to the park entrance.
30–45 min
Open the page →
From Washington, D.C.
Take I‑95 north to US‑40; park entrance is about 1 h from D.C.
1–1.5 h
Open the page →
From Ellicott City
Follow signs on US‑40 to the visitor center at 8020 Baltimore National Pike.
5 min
Open the page →
Zones and sectors
| Zone | What is there | Access |
|---|---|---|
| Visitor Center (Trout Brook) | Information desk, restrooms, maps, small exhibit. | Open daily, free. |
| River Trail Area | Swinging Bridge, Patapsco River loop, historic viaducts. | Open; parking fee applies. |
| Campsite Area | Tent sites, cabins, RV hookups. | Reservation recommended in good weather. |
Sketch map
Take the points offline
3 points as a GPX waypoint file, plus a plain-text list of coordinates. Save it while you have signal: maps apps show the points without a connection.
Coordinates are from the official park website; positions are approximate.
See & do
Caves, trails and wildlife, with how hard each is and whether it needs booking
Show Top experiencesHide
Top experiences
Practical
Fees, permits, rules, where to sleep and what can go wrong
Show 8 sectionsHideEntry fees and permits, Park rules, Where to stay, Safety, Accessibility, Visiting lightly, Questions people ask, Related
Entry fees and permits
| Item | Range | Per | Note |
|---|---|---|---|
| Park entry | Free | person | Free; parking $2 per vehicle (check) |
Ranges, not quotes: fees change without notice. Check with the park or your operator · checked Sep 2026.
Park entry no permit
Park rules
- Dogs
- Must be on leash at all times.
- Fireworks
- Not permitted anywhere in the park.
- Camping
- Only in designated campsites; no backcountry camping.
- Parking
- Pay $2 per vehicle at the lot; cash or card accepted.
- Litter
- Pack out all trash; bins at visitor center.
Where to stay
Near the park
Ellicott City hotels
Various mid‑range hotels within 5 km (3.1 mi) of the park gate.Various mid‑range hotels within 3.1 mi (5 km) of the park gate.
In the park
Patapsco campgrounds
Tent sites $10/night, cabins $20, RV sites $25 with hookups.
Safety
Heat medium
Thunderstorms medium
Lost on trails low
How much daylight do you have?
Time out
Finding the local time zone…
Times are local to the spot (zone loading). The half-hour margin is our rule of thumb, not an official figure; light fades earlier in forest or under cloud. Carry a headlamp on any route that could run late.
Accessibility
- Visitor center parking lot and restrooms are wheelchair accessible.
- Swinging Bridge has graded access but may be slippery when wet.
Visiting lightly
- Stay on trails to protect riverbank vegetation.
- Use refillable water bottles; refill at visitor center.
- Support local businesses in Ellicott City.
Questions people ask
How much does it cost to enter Patapsco Valley State Park?
Entry is free; parking costs $2 per vehicle. Camping sites are $10–$25 per night depending on accommodation.
What are the best hikes in Patapsco Valley State Park?
The Swinging Bridge walk (30 min) and the Patapsco River Loop (2–3 h) are popular and family‑friendly.
When is the best time to visit Patapsco Valley State Park?
Spring (Mar–May) and fall (Sep–Oct) offer mild weather and fewer crowds; avoid July‑August heat.
Are dogs allowed in the park?
Yes, but they must be on a leash at all times.
Is backcountry camping allowed?
No; only designated campsites and cabins may be used.
Deep dive
Every source; fees and rules change, so check before you go
Show the detailsHide
Ask about Patapsco Valley State Park
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