🌤 Weather at Sumner Lake State Park by season
| Spring | Summer | Fall | Winter |
|---|---|---|---|
| 34–85 °F | 61–96 °F | 32–86 °F | 24–60 °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 Sumner Lake, 1 mi away, elevation 4,306 ft. Conditions at the park can differ from the station, especially where elevation differs — check a forecast before you go.
Sumner Lake State Park is a public state park in New Mexico near Fort Sumner in De Baca County. Spanning 6,700 acres and established in 1966, this park offers a peaceful retreat into nature for visitors of all ages.
Quick Facts
| State | New Mexico |
| Nearest City | Fort Sumner |
| County | De Baca |
| Park Size | 6,700 acres |
| Established | 1966 |
Location & Getting There
Sumner Lake State Park is located near Fort Sumner, New Mexico. The park’s coordinates are 34.6125, -104.3961.
Things to Do
New Mexico state parks capture the stark beauty of the Southwest, ranging from high desert lakes to alpine mountain forests and dramatic canyons. Despite being a desert state, many parks are centered around reservoirs, offering surprising opportunities for sailing, boating, kayaking, and fishing for trout and bass. Land-based recreation includes hiking through rugged desert terrain, camping under some of the darkest, clearest night skies in the country, birdwatching along key migratory corridors like the Rio Grande, and exploring Native American ruins and geological wonders.
Best Time to Visit
Spring (March–May) and Fall (September–November) offer the best overall weather, with warm days and cool nights perfect for hiking and camping. Summer (June–August) is peak season for the lake parks and high-elevation mountain parks, but lower desert parks can experience extreme heat (100°F+). The late summer “monsoon” season (July-August) brings sudden, dramatic afternoon thunderstorms. Winter brings snow to the northern mountain parks, while southern parks remain mild and pleasant for “snowbird” campers.
Visitor Tips
Day use costs $5 per vehicle for New Mexico residents (free October 1 through April 30) and $10 for non-residents. An Annual Day-Use Pass costs $75 for residents and $150 for non-residents. High winds are common in the spring, which can affect boating on the larger lakes. Hydration is critical: always carry significantly more water than you think you need, as the high altitude and dry air accelerate dehydration. Sun protection is equally important. Campsite reservations recommend booking early, especially for the popular lakeside sites during summer and holidays.
Explore More New Mexico State Parks
Sumner Lake State Park is one of many outstanding state parks in New Mexico. Discover more parks in our Best State Parks in New Mexico guide, or use our Park Finder to search by activity, location, or features.
Wildlife & Nature
Sumner Lake SP — on Sumner Lake (4,500 acres) in the Pecos River valley. The park’s desert, lake, and red rock canyon support bald eagles, mule deer, and pronghorn. Walleye and catfish fill the lake.
Nearby Attractions
Fort Sumner — 16 miles south — where Billy the Kid was shot and killed by Pat Garrett in 1881. Billy the Kid Museum — in town. Bosque Redondo Memorial — nearby (site of the Navajo Long Walk).
Make it a road trip: Pair a visit with Santa Rosa Lake State Park (within about an hour’s drive) or Conchas Lake State Park (elsewhere in the state).
🐾 Dogs & Pets at Sumner Lake State Park
- Pets allowed? statewide rule
- Pets are allowed at most New Mexico state parks and must be on a leash at all times.
- Leash rule statewide rule
- Leash required at all times, maximum 10 feet in length
- Statewide exceptions statewide rule
- Only service dogs are allowed at Rio Grande Nature Center and Living Desert Zoo & Gardens State Parks; pets may not be left unattended
Are dogs allowed at Sumner Lake State Park?
Pets are allowed at most New Mexico state parks and must be on a leash at all times. Individual parks can post stricter rules — check signage on arrival.
Rules verified July 2026 via emnrd.nm.gov. More: New Mexico state parks guide · Dog rules in all 50 states compared
Park Location
Plan your gear for Sumner Lake State Park
From our editorial guides, matched to this park’s activities:
