Running Races in Sumner, WA

Marathons, 1-milers, 5Ks, half-marathons, 10Ks & more

See below for a frequently-updated, comprehensive list of upcoming running events in the local Sumner, WA area. Races listed here include both walking and running events of various distances — from 1-milers, to 5Ks, to marathons, and everything else in between.

Running-5K - Individual Age group/open

Organization: Lake Wilderness Triathlon

Date of Race: 06-06-2026

Description: Welcome to the 10th annual Lake Wilderness Run!! We're so excited ...

Running-10K - Individual Age group/open

Organization: Lake Wilderness Triathlon

Date of Race: 06-06-2026

Description: Welcome to the 10th annual Lake Wilderness Run!! We're so excited ...

Running-Half marathon - Individual Age group/open

Organization: Lake Wilderness Triathlon

Date of Race: 06-06-2026

Description: Welcome to the 10th annual Lake Wilderness Run!! We're so excited ...

Bubble Run - Value Registrations- R̶e̶g̶u̶l̶a̶r̶ P̶r̶i̶c̶e̶ $̶5̶4̶.̶9̶5̶

Organization: Viral Run

Date of Race: 08-01-2026

Description: If you’ve done a traditional 5K, you know they ...

Foam Glow - VIP Registration R̶e̶g̶u̶l̶a̶r̶ P̶r̶i̶c̶e̶ $̶9̶9̶.̶9̶5̶

Organization: Viral Run

Date of Race: 08-01-2026

Description: Foam Glow 5K™ is a fun filled experience exposing runners to ...

Bubble Run - Exclusive VIP Registration- R̶e̶g̶u̶l̶a̶r̶ P̶r̶i̶c̶e̶ ...

Organization: Viral Run

Date of Race: 08-01-2026

Description: If you’ve done a traditional 5K, you know they ...

Foam Glow - Value Registrations- R̶e̶g̶u̶l̶a̶r̶ P̶r̶i̶c̶e̶ $̶5̶4̶.̶9̶5̶

Organization: Viral Run

Date of Race: 08-01-2026

Description: Foam Glow 5K™ is a fun filled experience exposing runners to ...

Bubble Run | Seattle 2026

Organization: Viral Run

Date of Race: 08-01-2026

Description: If you’ve done a traditional 5K, you know they ...

Lake Wilderness Run

Organization: Lake Wilderness Triathlon

Date of Race: 06-06-2026

Description: Welcome to the 10th annual Lake Wilderness Run!! We're so excited ...

Foam Glow | Seattle 2026

Organization: Viral Run

Date of Race: 08-01-2026

Description: Foam Glow 5K™ is a fun filled experience exposing runners to ...

No Sun Fun Run (1-31-26)

Organization: Pierce County Parks

Date of Race: 01-31-2026

Description: DescriptionRain, sleet, or snow, the "No Sun Fun Run" will take ...

Onesie Run 5K

Organization: Pierce County Parks

Date of Race: 02-21-2026

Description: DescriptionSlip into your coziest onesie and hit the course for a ...

The Great Puzzle-Off

Organization: PenMet Parks

Date of Race: 03-06-2026

Description: DescriptionForm a team of up to 4 people and compete for ...

Spring Egg Hunt - Low Sensory

Organization: PenMet Parks

Date of Race: 04-04-2026

Description: DescriptionPlease note that only one registration is required per family.

Triathlon-Super Sprint - Full Triathlon 1/4S, 14B, 4R

Organization: Sammamish Running

Date of Race: 05-10-2026

Description: Join us for one of the top early premiere triathlons in ...

Triathlon-Super Sprint - Splash n Dash (kids 7-15)

Organization: Sammamish Running

Date of Race: 05-10-2026

Description: Join us for one of the top early premiere triathlons in ...

Triathlon-Super Sprint - Relay 1/4S, 14B, 4R

Organization: Sammamish Running

Date of Race: 05-10-2026

Description: Join us for one of the top early premiere triathlons in ...

Cedar River Triathlon

Organization: Sammamish Running

Date of Race: 05-10-2026

Description: Join us for one of the top early premiere triathlons in ...