Monarch Butterflies in Washington: Identification Guide and Best Places to Start

1. Where are monarch butterflies most likely to be seen in Washington?

Monarch butterflies concentrate in eastern Washington, especially in the Columbia Basin and along the Snake River. Look for them in open fields, meadows, and roadsides with abundant milkweed, their host plant. The best public spots include the Hanford Reach National Monument, Turnbull National Wildlife Refuge, and the banks of the Columbia River near Vantage. In western Washington, sightings are rarer but possible in coastal gardens and parks during migration.

2. What season and weather patterns help with spotting?

Monarchs appear in Washington from late May through September, with peak numbers in July and August. They prefer warm, sunny days with light wind. Cool, cloudy, or rainy weather keeps them hidden. After a cold spring, emergence may be delayed. The best time of day is mid morning to early afternoon when temperatures rise above 60°F.

3. How can you identify a monarch butterfly and avoid lookalikes?

Monarchs have bright orange wings with thick black veins and a double row of white spots on the black wing borders. The viceroy butterfly is a mimic but has a single horizontal black line crossing the hindwing. Also check for the monarch's slower, gliding flight. Females have darker veins and no scent patch on the hindwing. Males have a small black spot on each hindwing.

See our state animal guide for the next step.

4. What are the best trails and gardens for monarch watching?

Try the Columbia River Trail at Vantage, the Juniper Dunes Wilderness, or the trails at Toppenish National Wildlife Refuge. In the Puget Sound area, the Washington Park Arboretum in Seattle and the Point Defiance Park in Tacoma host milkweed plantings. For a dedicated garden, visit the Monarch Waystation at the Washington State University Extension in Spokane County.

5. What is the monarch butterfly's migration pattern through Washington?

Washington is part of the western monarch population's summer range. Monarchs arrive in spring from California coastal overwintering sites. They breed here for one or two generations, then return south in late summer. The Columbia River Gorge acts as a natural flyway. Unlike eastern monarchs, western monarchs seldom travel through Texas, instead following the Pacific coast.