🌤 Weather at Caledonia State Park by season
| Spring | Summer | Fall | Winter |
|---|---|---|---|
| 28–69 °F | 58–81 °F | 33–73 °F | 20–40 °F |
Each range runs from the coldest monthly average low to the warmest monthly average high in that season (1991-2020 climate normals), measured at S Mountain, 4 mi away, elevation 1,520 ft. Conditions at the park can differ from the station, especially where elevation differs — check a forecast before you go.
🏆 Where the Appalachian Trail Meets Civil War History — 1,125 acres in the South Mountain corridor with a section of the AT, swimming pool with waterslide, 175 campsites, trout-stocked Conococheague Creek, and the ruins of Thaddeus Stevens’ iron furnace burned by Confederates in 1863
Why Caledonia Is Pennsylvania’s Most Historic Trail Park
Caledonia State Park sits at a remarkable intersection of American history and Appalachian wilderness. Located where Adams County meets Franklin County on South Mountain, this 1,125-acre park contains a section of the Appalachian Trail, the ruins of an iron furnace destroyed by Confederate troops during the Gettysburg Campaign, and one of the most beloved swimming pools in Pennsylvania’s state park system. It is a place where you can hike the AT in the morning, study Civil War history in the afternoon, and catch trout in the Conococheague Creek at sunset.
Civil War History: Thaddeus Stevens and the Burning Furnace
The park’s most historically significant feature is the Caledonia Iron Furnace, built and operated by Thaddeus Stevens beginning in 1837. Stevens was no ordinary ironmaster — he was a fierce abolitionist, a Radical Republican Congressman, and one of the most powerful voices against slavery in American politics. In June 1863, as Confederate General Jubal Early’s forces marched toward Gettysburg, Early ordered the furnace burned to the ground as direct retaliation against Stevens’ anti-slavery stance.
The ruins of the furnace remain in the park and are interpreted with historical markers. Stevens went on to lead the Reconstruction efforts after the Civil War, and his legacy as “The Great Commoner” is preserved here where his industrial ambitions and political convictions literally collided with the Confederate army.
Hiking and the Appalachian Trail
| Trail | Distance | Difficulty | Highlights |
|---|---|---|---|
| Appalachian Trail | Through-hike section | Moderate | The AT crosses through the park; white blazes through forest |
| Charcoal Hearth Trail | 2.0 mi loop | Easy | Historic charcoal production sites; family-friendly |
| Three Valley Loop | 3.5 mi | Moderate | Creek crossings; valley views; wildflowers |
| Ramble Trail | 1.0 mi | Easy | Nature walk; interpretive signs; creek access |
Swimming Pool and Creek Activities
Caledonia’s ADA-accessible swimming pool with waterslide is one of the most popular features in the entire Pennsylvania state park system. Open from Memorial Day through Labor Day, the pool charges a small fee and features a snack bar. The East Branch Conococheague Creek, which flows through the park, is stocked with trout by the Pennsylvania Fish and Boat Commission and provides excellent fly fishing and spin casting opportunities.
Camping
| Campground | Sites | Amenities | Best For |
|---|---|---|---|
| Chinquapin Hill | 80+ sites | Some electric; modern bathhouse; shaded | RV and tent; close to pool |
| Hosack Run | 90+ sites | Some full hookup; bathhouse | Larger RVs; creek access |
| All Sites | 175 total | Tables, fire rings, flush toilets, hot showers | Reservations recommended |
Best Time to Visit
| Season | Weather | Crowds | Best For |
|---|---|---|---|
| Fall (Sep-Oct) | 50-68°F | High | Spectacular foliage on South Mountain; AT hiking; trout |
| Summer (Jun-Aug) | 75-85°F | High | Swimming pool; camping; creek wading; Gettysburg visits |
| Spring (Apr-May) | 50-70°F | Moderate | Trout stocking; wildflowers; AT thru-hikers passing |
| Winter (Dec-Feb) | 25-40°F | Very Low | Cross-country skiing; cabin rentals; solitude |
Keep exploring: The closest neighbors are Michaux State Forest (a short drive away) and Mont Alto State Park (a short drive away).
🥾 Hike the AT, Explore the Civil War
Walk the Appalachian Trail, study the ruins of a furnace burned by Confederate soldiers, and swim in one of Pennsylvania’s finest state park pools.
Frequently Asked Questions
Can I hike the Appalachian Trail from Caledonia?
Yes. The Appalachian Trail passes directly through Caledonia State Park, making it an excellent access point for day hikes or section hikes along the AT. The trail is marked with white blazes and connects to the broader 2,190-mile trail system running from Georgia to Maine.
Is the swimming pool free?
No. The swimming pool charges a small admission fee (typically $4-8 per person). The pool is ADA-accessible, features a waterslide and snack bar, and is open from Memorial Day weekend through Labor Day. It fills up on hot weekends, so arrive early.
How close is Gettysburg?
Gettysburg National Military Park is approximately 10 miles east of Caledonia State Park, making it easy to combine a camping trip at Caledonia with battlefield tours. Many visitors use Caledonia as a base camp for exploring the Gettysburg area while enjoying the park’s trails and pool.
Explore More Pennsylvania State Parks
Caledonia State Park is one of many outstanding state parks in Pennsylvania. Discover more parks in our Best State Parks in Pennsylvania guide, or use our Park Finder to search by activity, location, or features.
Wildlife & Nature
Caledonia SP — in the South Mountain — was the site of Thaddeus Stevens’ iron furnace, burned by Confederate troops during the Gettysburg Campaign (1863). The park’s mountain forest, streams, and rhododendron thickets support white-tailed deer, black bears, and wild turkeys. Brook trout fill the mountain streams. Rhododendron blooms spectacularly in June.
Nearby Attractions
Fayetteville — adjacent. Gettysburg — 15 miles east — has the Civil War battlefield. Michaux SF — surrounding. Appalachian Trail — traverses nearby.
🐾 Dogs & Pets at Caledonia State Park
- Pets allowed? statewide rule
- Pets are allowed in day-use areas of Pennsylvania state parks and in designated campground sites, but must be physically controlled, attended at all times and leashed, caged or crated.
- Leash rule statewide rule
- Leash required at all times; no universal maximum length — inquire at the park office (electronic fences/shock collars not accepted as control)
- Beaches & swim areas statewide rule
- Pets are prohibited in swimming areas and designated beaches
- Cabins & lodging statewide rule
- Dogs allowed in a limited number of designated cabins, cottages and yurts (pilot program); maximum two dogs per unit; dogs must be house-trained and current on rabies vaccination
- Pet fees statewide rule
- No standard statewide pet fee; fees may be assessed for damage in dog-friendly lodging
- Statewide exceptions statewide rule
- Maximum two non-caged pets per campsite; pets prohibited in buildings; pet food may not be left outside camping units
Are dogs allowed at Caledonia State Park?
Pets are allowed in day-use areas of Pennsylvania state parks and in designated campground sites, but must be physically controlled, attended at all times and leashed, caged or crated. Individual parks can post stricter rules — check signage on arrival.
Rules verified July 2026 via pa.gov. More: Pennsylvania state parks guide · Dog rules in all 50 states compared
Park Location
Plan your gear for Caledonia State Park
From our editorial guides, matched to this park’s activities:
