4K Trail Run 2025

© © 4K Trail Run

Short review

The 4K Trail Run is the most unique race in Boston! Taking place on Cathleen Stone Island in the Boston Harbor, teams and individual runners will enjoy an afternoon and evening with their coworkers and friends. After a short ferry ride (~30 minutes) to the island, the event will kick off with a 4K race through the island and end with dinner, beer, and an on-island party.

Every dollar raised from the 4K Trail Run supports Cathleen Stone Island's mission to deliver free, hands-on science learning to Boston's youth. The 4K Trail Run is an excellent way to invest in education of Boston youth and is our most popular corporate fundraising event. This year’s 4K Trail Run will take place on Wednesday, May 21st, and Thursday, May 22nd, 2025 (Teams and runners must select one day to participate).

Registration closed

Road Running , Walk , Vertical race

Distance:

Less than 5K

Organized since 2019

Short review

The 4K Trail Run is the most unique race in Boston! Taking place on Cathleen Stone Island in the Boston Harbor, teams and individual runners will enjoy an afternoon and evening with their coworkers and friends. After a short ferry ride (~30 minutes) to the island, the event will kick off with a 4K race through the island and end with dinner, beer, and an on-island party.

Every dollar raised from the 4K Trail Run supports Cathleen Stone Island's mission to deliver free, hands-on science learning to Boston's youth. The 4K Trail Run is an excellent way to invest in education of Boston youth and is our most popular corporate fundraising event. This year’s 4K Trail Run will take place on Wednesday, May 21st, and Thursday, May 22nd, 2025 (Teams and runners must select one day to participate).


20 Road Running races on 21 — 22 May 2025 in Boston

Runner

September 19, 2020

The race starts at 00:00

4 km

from $25

Gold Medal Runner

September 19, 2020

The race starts at 16:00

4 km

from $75

Virtual Runner

September 22, 2021

The race starts at 09:00

4 km

from $45

On Island Wednesday 4K Trail Run

September 29, 2021

The race starts at 16:00

4 km

from $0

On Island Thursday 4K Trail Run

September 30, 2021

The race starts at 16:00

4 km

from $0

ISLE Society On Island 4K Trail Run

September 29, 2021

The race starts at 16:00

4 km

from $85

Wednesday 4K Trail Run

May 22, 2024

The race starts at 16:00

4 km

from $95

Wednesday 4K Trail Run - Team Registrations

May 22, 2024

The race starts at 16:00

4 km

from $0

Thursday 4K Trail Run - Team Registrations

May 23, 2024

The race starts at 16:00

4 km

from $0

Thursday 4K Trail Run

May 23, 2024

The race starts at 16:00

4 km

from $95

Wednesday 4K Trail Run - Individual Registrations

May 21, 2025

The race starts at 16:00

4 km

from $95

Wednesday 4K Trail Run - Team Registrations

May 21, 2025

The race starts at 16:00

4 km

from $0

Thursday 4K Trail Run - Individual Registrations

May 22, 2025

The race starts at 16:00

4 km

from $95

Thursday 4K Trail Run - Team Registrations

May 22, 2025

The race starts at 16:00

4 km

from $0

Team Challenge - Leg Week

August 30, 2020

The race starts at 16:00

from $0

Team Challenge - Upper Body Week

September 06, 2020

The race starts at 16:00

from $0

Team Challenge - Full Body Moves!

September 13, 2020

The race starts at 16:00

from $0

Leg Week Challenger - Squats & Lunges

August 30, 2020

The race starts at 16:00

from $0

Upper Body Week Challenger - Push Ups & Tricep Dips

September 06, 2020

The race starts at 16:00

from $0

Full Body Moves Challenger - Burpees, Mountain Climbers, and Plank Up/Downs

September 13, 2020

The race starts at 16:00

from $0

Weather for May 21, 2025

°F

Wind: m/s.

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Very Good for running

Past weather

Sep 19, 2020

65.08 °F, wind 9.51m/s

Mostly cloudy throughout the day..

Sep 22, 2021

68.78 °F, wind 2.94m/s

Partly cloudy throughout the day..

May 25, 2022

62.57 °F, wind 7.96m/s

Partly cloudy throughout the day..

May 24, 2023

°F, wind m/s

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May 22, 2024

°F, wind m/s

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Feb 19, 2025

°F, wind m/s

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Powered by Dark Sky

What to wear on your run?

Contacts of the organizers & official website

We recommend checking the official website for up-to-date information.

The information about 4K Trail Run is based on information provided by the organizers or found on the official website of the event.

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