Best natural monuments in Thurston County showcase a diverse landscape shaped by geological history. This region in Washington features unique landforms, extensive trail systems, and significant ecological heritage. Visitors can explore a variety of natural areas, including prairies, wetlands, forests, and coastal estuaries. These sites offer opportunities for wildlife viewing, hiking, and experiencing the distinctive natural features of the area.
Last updated: May 11, 2026
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Woodard Bay Conservation Area spans 870 acres and protects and provides habitat for harbor seals, bald eagles, a large colony of bats, and one of the largest heron nesting areas in the state. There are forested hiking trails and a paved road that serves as a trail, although some close seasonally to protect nesting herons and eagles. It is a wonderful place to connect with nature as you explore this beautiful area. Dogs are not allowed in the preserve, even on a leash, so you'll need to leave your pup at home.
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At an elevation of 2,356 feet, Rock Candy Mountain is one of the tallest peaks in Thurston County. The trail and road systems covering the mountain and surrounding foothills are heavily utilized by off-roaders and mountain bikers. There are a few different loops you can make out here, some just an hour long and others extending over 30 miles.
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Parking costs $3, payable by cash or check. The National Wildlife Refuge also accepts all types of America the Beautiful passes. The Visitor Center is open Wednesday - Friday, 9:00 - 4:00. It features an accessible viewing platform, exhibits on the habitat and wildlife, and a gift shop benefitting the Friends of Nisqually National Wildlife Refuge Complex.
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The Nisqually Estuary Boardwalk has a covered viewing platform with scopes at its north end. This part of the boardwalk may be closed during waterfowl hunting seasons. On clear days, you can see Mount Rainier to the east.
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Parking costs $3, payable by cash or check. The National Wildlife Refuge also accepts all types of America the Beautiful passes. The Visitor Center is open Wednesday - Friday, 9:00 - 4:00. It features an accessible viewing platform, exhibits on the habitat and wildlife, and a gift shop benefitting the Friends of Nisqually National Wildlife Refuge Complex.
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No one knows exactly what created the distinct geological formations beneath this prairie, but many hypotheses have been made. In any case, all agree that this is a special place, and it was designated as a National Natural Landmark in 1966. A Discover Pass is required to park at the trailhead. Only service dogs are allowed here.
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Get a better look at the strange mounds from a raised viewing platform. Interpretive signs at the viewing platform describe the unknown origins of this geological phenomenon.
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The 640-acre Mima Mounds Natural Area Preserve contains around 370 acres of mounded prairie. The area's marine-influenced climate is mild, with warm, dry summers and cool, but mostly snow-free winters at 200 feet above sea level. Mima Mounds Preserve's grassland is native glacial outwash prairie.
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Yes, Thurston County offers several natural monuments suitable for families. The Mima Mounds Natural Area Preserve features interpretive trails that are easy for all ages. The Woodard Bay Natural Resources Conservation Area is also family-friendly, offering trails through forest and along a lake. Additionally, Tumwater Falls Park provides a picturesque setting with easy walks and the excitement of salmon migration in late summer.
Several natural monuments in Thurston County offer good accessibility. The Norm Dicks Visitor Center and the Nisqually Estuary Boardwalk Viewing Platform are both wheelchair-accessible, providing excellent views and exhibits. The Mima Mounds Natural Area Preserve has a 0.5-mile paved, ADA-accessible loop trail, and the McLane Creek Nature Trail is also stroller and wheelchair-friendly.
Thurston County is home to fascinating geological formations. The most notable are the enigmatic Mima Mounds at the Mima Mounds Natural Area Preserve, a rare phenomenon of hundreds of low, dome-like mounds whose origin is still debated. You can learn more about them at the Mima Mounds Interpretive Center. The region's landscape was also shaped by glaciers, leaving behind features like kettle lakes and ancient river channels.
Thurston County's natural monuments are excellent for wildlife viewing. The Billy Frank Jr. Nisqually National Wildlife Refuge, accessible via the Norm Dicks Visitor Center and the Nisqually Estuary Boardwalk Viewing Platform, is a crucial stop for over 200 species of migratory birds. McLane Creek Nature Trail is known for sightings of beavers, otters, and various bird species. Tolmie State Park offers opportunities to observe marine wildlife and diverse bird species along Puget Sound.
You'll find a variety of hiking trails. The Mima Mounds Natural Area Preserve offers interpretive trails through unique prairies. Millersylvania State Park provides over eight miles of trails through forests and wetlands. For a more challenging experience, Rock Candy Mountain features trails heavily utilized by mountain bikers and off-roaders, with loops ranging from an hour to over 30 miles. You can find more hiking options in the Hiking in Thurston County guide.
Yes, several natural monuments are near water bodies. Millersylvania State Park features a stunning lake with a sandy beach, perfect for swimming and picnicking. Guerin Park is nestled on the shoreline of Black Lake, offering a quiet natural setting. Tolmie State Park provides access to Puget Sound, with opportunities to explore beaches and saltwater marshes. Tumwater Falls Park showcases the Deschutes River's impressive falls.
Thurston County's natural monuments can be enjoyed year-round, but each season offers unique experiences. Summer and early fall are ideal for hiking and outdoor activities due to warm, dry weather. Late summer, particularly August, is excellent for visiting Tumwater Falls Park to witness the annual salmon migration. Birdwatching is prominent throughout the year at the Billy Frank Jr. Nisqually National Wildlife Refuge, with migratory birds arriving in different seasons. Winters are generally mild and mostly snow-free, allowing for cool-weather exploration.
Beginners can enjoy several easy trails. The McLane Creek Nature Trail is a 2.5-mile loop that is generally flat and accessible. The Mima Mounds Natural Area Preserve has an easy 0.5-mile paved loop. Tumwater Falls Park also offers an easy, scenic walk along the falls. For more options, check out the Easy hikes in Thurston County guide.
Dog policies vary by location. At the Mima Mounds Natural Area Preserve, only service dogs are allowed. However, many state parks and other natural areas in Thurston County are dog-friendly, often requiring dogs to be on a leash. It's always best to check the specific regulations for each natural monument before visiting with your pet.
Thurston County boasts an extensive trail system. The Chehalis Western Trail and the Yelm-Rainier-Tenino Trail are popular paved, off-road paths suitable for walking, biking, and running, traversing diverse landscapes. These trails offer long-distance options for exploring the region. You can find routes like the Chehalis Western Trail in the Running Trails in Thurston County guide.
Yes, Tolmie State Park, located in the northeastern part of Thurston County, is known for its stunning views of Puget Sound. Its 1.5-mile trail winds through beaches, saltwater marshes, and forested areas, providing excellent vantage points for observing the Sound and marine wildlife.
Facilities vary by location. The Norm Dicks Visitor Center offers an accessible viewing platform, exhibits, and a gift shop. The Mima Mounds Interpretive Center provides a raised viewing platform and interpretive signs. Many parks, like Millersylvania State Park, offer picnic areas and restrooms. Parking is generally available, though some locations like the Nisqually National Wildlife Refuge may have a fee or require a Discover Pass.
Yes, the natural monuments often have rich historical and cultural significance. Tumwater Falls Park, for instance, offers free guided tours that cover the area's pioneer past and the history of the Olympia Brewing Company. The Billy Frank Jr. Nisqually National Wildlife Refuge is named after a prominent Nisqually tribal member and environmental activist, reflecting the deep connection between the indigenous people and the land. The Mima Mounds have been designated a National Natural Landmark, highlighting their scientific importance.


Extend your search for the best caves by checking out these guides of the top ones in Thurston County: