Race Discovery
4K Trail Run
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4K Trail Run

Boston, Massachusetts, United States
May 20, 2026 – May 21, 2026
Running

About this race

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 around 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 20th, and Thursday, May 21st, 2026 (Teams and runners must select one day to participate).

Join fellow runners on May 20, 2026 for the 4K Trail Run. It's a fantastic 4K featuring a flat and fast course in Boston.

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Running

Wednesday 4K Trail Run - Individual Registrations

Each runner receives chip-timed entry, round-trip ferry transportation, a race t-shirt, dinner and beer!

May 20, 2026 4K 4:00 PM
$95.00
Closed

Wednesday 4K Trail Run - Team Registrations

Each runner receives chip-timed entry, round-trip ferry transportation, a race t-shirt, dinner and beer!

May 20, 2026 4K 4:00 PM
Free
Closed

Thursday 4K Trail Run - Individual Registrations

Each runner receives chip-timed entry, round-trip ferry transportation, a race t-shirt, dinner and beer!

May 20, 2026 4K 4:00 PM
$95.00
Closed

Thursday 4K Trail Run - Team Registrations

Each runner receives chip-timed entry, round-trip ferry transportation, a race t-shirt, dinner and beer!

May 20, 2026 4K 4:00 PM
Free
Closed

Weather Overview

These values represent the 11-year monthly averages for May in Boston.

Temp (°C)
Minimum temperature (monthly average) 14.4° / Maximum temperature (monthly average) 23.6°
Feels Like (°C)
Minimum feels like (with wind chill; monthly average) 14.4° / Maximum feels like (with wind chill; monthly average) 23.6°
Wind (km/h)
Average wind speed (monthly average)
18.6
Precipitation (mm)
Average precipitation (monthly average)
3.0mm

About Boston

4K Trail Run takes place in Boston, Massachusetts, United States. The local timezone is America/New_York.

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Race information has been sourced from the event's official website and other publicly available resources. For the most up-to-date details, please refer to the official website directly. If you notice any incorrect or missing information, don't hesitate to reach out to us by email.

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