Photo: Aneil Lutchman, CC BY-SA 2.0, via Wikimedia Commons
Wild Horse Island State Park
🌤 Weather at Wild Horse Island State Park by season
| Spring | Summer | Fall | Winter |
|---|---|---|---|
| 30–63 °F | 49–80 °F | 32–69 °F | 25–37 °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 Bigfork 13 S, 9 mi away, elevation 2,979 ft. Conditions at the park can differ from the station, especially where elevation differs — check a forecast before you go.
Montana’s Island Wildlife Sanctuary on Flathead Lake
Wild Horse Island, a unit of Flathead Lake State Park, is the largest island on Flathead Lake — and one of the most extraordinary day-trip destinations in Montana. This 2,160-acre island is home to a small herd of wild horses (typically 5–6 animals), 160–200 bighorn sheep, mule deer, bald eagles, osprey, and falcons.
There’s no bridge and no public ferry — you need a private boat or charter to reach the island. That barrier to entry keeps Wild Horse Island wonderfully uncrowded, even in peak summer. The Salish-Kootenai tribes originally used the island to pasture horses, keeping them safe from rival tribes — a tradition that gave the island its name and its most famous residents.
🚤 Getting There
Access Details
- No public ferry — must arrive by private boat, kayak, or hired charter
- Charter services: Available from Polson, Bigfork, and Rollins marinas
- Main landing: Skeeko Bay (northwest side) — gravel beach, trailhead, vault toilets
- Other landings: Eagle Cove, Pikes Bay
- Important: Private property exists along parts of the perimeter — use only designated landing sites
🐴 Wildlife Viewing
Wildlife is the main attraction, and sightings are surprisingly reliable:
| Species | Population | Where to Spot Them |
|---|---|---|
| Wild Horses 🐴 | 5–6 | Grasslands and meadows in the island interior |
| Bighorn Sheep 🐑 | 160–200 | Rocky ridgelines and cliffs; Eagle Cove area is reliable |
| Mule Deer 🦌 | Common | Throughout the island, especially dawn and dusk |
| Bald Eagles 🦅 | Multiple pairs | Nesting in old-growth ponderosa; visible soaring over lake |
| Black Bears 🐻 | Occasional | Carry bear spray; keep distance if encountered |
📸 Wildlife Photography Tips
- Bring a telephoto lens (200mm+) — wildlife keeps its distance
- Bighorn sheep are most active in morning hours at Eagle Cove
- Wild horses are unpredictable — patience is key; scan meadows from ridgelines
- Keep 100+ yards from all wildlife; do not approach or feed
🥾 Hiking
Wild Horse Island has approximately 4 miles of interconnected trails, plus you’re welcome to explore off-trail. From Skeeko Bay, a loop trail leads to Eagle Cove — the most reliable spot for bighorn sheep sightings. Ridge ascent trails climb to panoramic viewpoints overlooking Flathead Lake, the Mission Mountains, and the Swan Range.
📋 Important Rules
- Day-use only — no camping
- No pets — prohibited to protect wildlife
- No bikes
- No fires or smoking
- Fishing requires a tribal license (Flathead Indian Reservation waters)
- Stay on designated landing sites; respect private property boundaries
📋 Visitor Information
| Detail | Info |
|---|---|
| Location | Flathead Lake, near Polson/Bigfork, MT |
| Size | 2,160 acres |
| Access | Private boat or charter only |
| Season | Open year-round; best May–September |
| Phone | (406) 837-3041 |
❓ Frequently Asked Questions
Explore More Montana State Parks
Wild Horse Island State Park is one of many outstanding state parks in Montana. Discover more parks in our Best State Parks in Montana guide, or use our Park Finder to search by activity, location, or features.
Keep exploring: Wild Horse Island State Park is one of the six units of Flathead Lake State Park, together with Big Arm State Park, Finley Point State Park, Wayfarers State Park, West Shore State Park and Yellow Bay State Park.
🐾 Dogs & Pets at Wild Horse Island State Park
Park policy: Montana FWP bans pets across all 2,160 acres of Wild Horse Island so that wildlife viewing stays undisturbed, and the island is reachable only by private boat, so there is no kennel or holding option on site. Leave your dog on the mainland: this is a day-use area with no camping, and bears frequent the island while food storage lockers do not exist there.
- Pets allowed?
- No pets anywhere on the island, to protect wildlife viewing
- Leash rule statewide rule
- Leash no longer than 8 feet required, unless otherwise posted.
- Beaches & swim areas statewide rule
- Pets are prohibited from swimming beaches and posted restricted areas.
- Park-specific rules
- Park regulations also make it a violation to feed, pet or intentionally approach within 100 feet of any wildlife, including the bighorn sheep, mule deer and the five wild horses.
- Statewide exceptions statewide rule
- Pets prohibited at Frenchtown Pond and Wild Horse Island; kennel service offered during Lewis and Clark Caverns tours; Spring Meadow Lake no pets April 16 - October 14; Lake Elmo has a fenced dog park.
Are dogs allowed at Wild Horse Island State Park?
No pets anywhere on the island, to protect wildlife viewing.
Beyond that, Montana’s statewide rules apply.
Rules verified July 2026 via fwp.mt.gov. More: Montana state parks guide · Dog rules in all 50 states compared
Park Map
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