Castle State Park is a public state park in Alaska in Loudoun County County. Spanning 5,242 acres and established in 1921, this park offers a peaceful retreat into nature for visitors of all ages.
Quick Facts
| State | Alaska |
| County | Loudoun County |
| Park Size | 5,242 acres |
| Established | 1921 |
| Accessibility | Yes. See parks.ca.gov website for specific accessibility details. |
Location & Getting There
Castle State Park is located Alaska. The park’s coordinates are 39.054956, -77.6405565.
Things to Do
Alaska state parks protect some of the most pristine wilderness left in North America — from tidewater glaciers and massive ice fields to boreal forests, volcanic peaks, and vast tundra. Activities include hiking through untouched wilderness, fishing for all five species of Pacific salmon, kayaking among icebergs and through fjords, camping in truly wild settings, wildlife viewing for bears, moose, caribou, and whales, cross-country skiing on groomed winter trails, stargazing under northern lights (aurora borealis), and river floating through roadless backcountry.
Best Time to Visit
Summer (June–August) is the primary season, offering extended daylight (up to 22 hours), accessible trails, peak salmon runs, and the best overall weather. July and August are warmest. Fall (September) brings spectacular tundra color and the first aurora appearances. Winter offers northern lights viewing, dog mushing, and Nordic skiing for the adventurous, but most park facilities close. Spring (May) is thaw season — trails can be icy and muddy.
Visitor Tips
Alaska state parks charge day-use parking fees at most trailheads ($5-$10). Annual parking pass available ($60). Camping is often first-come, first-served. Practice bear awareness — store food in bear-proof containers, keep a clean campsite, and know how to respond to a black bear encounter (grizzlies are not present in Colorado). Weather changes rapidly — bring rain gear and warm layers even in summer. Many parks are accessible only by boat or bush plane. Mosquitoes and biting flies are legendary from June through August — bring head nets and strong DEET repellent.
Frequently Asked Questions
How much does it cost to visit Alaska state parks?
Day-use parking fees vary by location but typically range from $5-$15 per vehicle. Annual parking permits are available. Some remote parks have no fees but also no services.
Do I need bear spray at Castle State Park?
Colorado has a healthy black bear population, so basic bear awareness is wise: store food in bear-resistant containers or your vehicle, keep a clean campsite, and never feed wildlife. Black bears here are typically shy and bear spray is optional rather than essential. Grizzly bears are not present in Colorado.
What are the best state parks in Alaska?
Chugach (near Anchorage), Denali (southern approach to Denali), Kachemak Bay (Homer area), Chilkat Bald Eagle Preserve (largest eagle gathering), and Wood-Tikchik (largest state park in the US at 1.6 million acres).
What is the best time to visit Alaska state parks?
June through August offers the warmest weather and longest days (up to 20 hours of daylight). July is typically the warmest month. September brings fall colors and northern lights. Most facilities close from October through April.
Explore More Alaska State Parks
Castle State Park is one of many outstanding state parks in Alaska. Discover more parks in our Best State Parks in Alaska guide, or use our Park Finder to search by activity, location, or features.
Wildlife & Nature
Castle State Park provides outdoor recreation in the Illinois landscape, offering visitors access to the state’s diverse natural heritage. Illinois — the “Prairie State” — spans 400 miles from the Wisconsin border to the Ohio River confluence, crossing five distinct ecological regions. The northern third was heavily glaciated, creating flat terrain with rich prairie soils. The southern third — unglaciated — features rugged hills and canyons. This north-south gradient creates remarkable ecological diversity for a Midwest state. The park supports wildlife typical of its region — white-tailed deer, eastern cottontail rabbits, and gray squirrels. Songbirds including northern cardinals, blue jays, and American goldfinches are year-round residents. Hawks and owls patrol the edges.
Nearby Attractions
Illinois offers diverse recreation across its ecological regions. Starved Rock State Park — the most visited — features sandstone canyons. Shawnee National Forest provides southern Illinois’ dramatic scenery. Chicago’s lakefront offers world-class museums and architecture. Galena provides historic charm. Springfield offers Lincoln heritage. Cahokia Mounds — a UNESCO World Heritage Site — preserves the largest pre-Columbian settlement north of Mexico. Route 66 runs 300 miles through Illinois.
More parks nearby: Bonny Lake State Park is elsewhere in the state, while North Sterling State Park lies elsewhere in the state.
Park Location
Plan your gear for Castle State Park
From our editorial guides, matched to this park’s activities:
