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KEYS100 Ultramarathon

KEYS100 Ultramarathon is a running race on May 15–16, 2027 in Key West, FL, with entry fees from $240 to $1050.

Date
May 15–16, 2027 (306 days to go)
Price
$240–$1050
Sport
Running
Register →

From the Organizer

Registration is open for the 19th Annual race across the islands of the Florida Keys--May 15-16, 2027.  This chain of unique and inter-connected islands--some inhabited, some not--end in the City of Key West, just 90 miles from Cuba. This is a pavement race, with approximately 75% run on paved bike paths and sidewalks, parallel pedestrian bridges and portions of the old service road.  The balance is run on the road shoulder facing traffic--and close to it. (Awareness and caution are paramount when running these sections.) The Florida Keys, known locally as "The Conch Republic", is a spectacular and laid-back sub-tropical paradise, surrounded by the turquoise waters of the Atlantic Ocean and Florida Bay/Gulf of Mexico. The Keys feature great fishing, kayaking, snorkeling and diving, hotels, resorts, B&B's and cuisine and cocktails to fit every budget. There is entertainment to fit every taste, important history and a unique culture, sunsets that will keep you spellbound, special events going on throughout the year including KEYS100, of course, and you don't need a passport to visit here! So, what are you waiting for? We've saved a space for you!

Events

100 Mile Team Relay$1050
100 Mile Individual Ultra$355
50 Mile Individual Ultra$305
50 Mile Team Relay$540
50 Kilometer Individual Ultra$240

Weather

Typical Conditions

It's too far out for a forecast, so here's what weather on this date is normally like in the area. A race day forecast will replace this as race week approaches.

Typical High

86°

Typical Low

74°

Chance of Rain

27%

Based on US Climate Normals data from Key W Wfo.

Sunrise 6:43 AMSunset 8:03 PMDaylight 13h 20m

Host City

About Key West, FL

Population

25,824

as of 2023

City Elevation

3 ft

Nearest Airport

EYW

Key West International Airport · 1 mi

Major Hub

MIA

Miami International Airport · 127 mi

Time Zone

Eastern Time

From Endurance Grid

A mid-size host city. Enough lodging and amenities to keep race weekend easy, without big-city sprawl.

Race Location

Approximate location — pin shows the host city, not the exact venue.

Your Next Start Line

What Are You
Waiting For?

Every finish line starts with a single decision. Claim your spot at KEYS100 Ultramarathon, put it on the calendar, and turn “someday” into a start date.

306

Days to train

Race
KEYS100 Ultramarathon
Date
May 15–16, 2027

Plan your trip

Make it a Racecation

Coming from out of town? There's more to Key West than race day. We'll help you line up nearby lodging, flights, a rental car, and things to do so you can make the most of your racecation.

Plan your trip to Key West
Lodging
Flights
Rental Car
Activities

From Endurance Grid

About This Sport

Endurance Grid is here to help you understand the sport, decide if it’s the right fit, and learn how to prepare. For course distances, logistics, and race-day specifics, always defer to the race organizer’s event page.

With running, there's a distance for every fitness level, a community at every start line, and nothing beats the feeling of crossing a finish line you trained for.

Running is an endurance sport that rewards consistency, and showing up every week compounds in ways that will surprise you.

Read the Guide

Running

From 5K to marathon, running races are an accessible entry point into endurance sport. There's a distance for every fitness level and a community at every start line.

Frequently Asked Questions (FAQs)

What is the KEYS100 Ultramarathon?+
KEYS100 Ultramarathon is a running race held in Key West, Florida on May 15, 2027. It is one of the many endurance events listed on Endurance Grid, a multi-sport endurance event calendar covering running races, triathlons, HYROX, and more endurance sports across the United States. Find more running races near you or explore our sports guides to learn what race day actually feels like.
When and where is the KEYS100 Ultramarathon?+
Saturday, May 15, 2027 in Key West, Florida at Higgs Beach. Check the event page for exact start times and wave schedules.
How do I register for the KEYS100 Ultramarathon?+
Registration is handled through the event's registration page. Confirm pricing and distances there, and sign up.

KEYS100 Ultramarathon

May 15, 2027

Register →