San Juan Island Marathon

USATF Certified

Saturday, June 20, 2026

Friday Harbor, Washington

USATFCourse

Course Information

USATF Certified Course

WA19006RMB · Expires 2029

Certified Course Name

Mercer Island Half Marathon

Net Drop

-0.38

m/km

Separation

0.2%

start to finish

This course is relatively flat with minimal net elevation change. Loop course — start and finish are close together.

Race Details

Race Day

Saturday, June 20, 2026

Course

Loop

Also Offers

26.2M10K run

Registration

Race Website

Official race information

Historical Weather

☀

Avg High

64°F

☽

Avg Low

52°F

☂

Precip

0.03 in

🍃

Wind

13.8 mph

76% humidity·Based on 5-year historical data

More races in Washington

FEB 15

Three Lakes Triathlons and Kings Market San Juan Island Runs

APR 4

Deception Pass 13.1M and 10K

APR 4

Hop Hop Half

APR 4

Always Hope Easter Run 5K/10K/13.1 SEATTLE

Get notified about races in Washington

New races, registration alerts, and insider tips from your State Guru.

We'll never share your email.

Course Information

USATF Certified Course

WA19006RMB · Expires 2029

Certified Course Name

Mercer Island Half Marathon

Net Drop

-0.38

m/km

Separation

0.2%

start to finish

This course is relatively flat with minimal net elevation change. Loop course — start and finish are close together.

Race Details

Race Day

Saturday, June 20, 2026

Course

Loop

Also Offers

26.2M10K run

Registration

Race Website

Official race information