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KEYS100 Ultramarathon

Name: KEYS100 Ultramarathon
Start: 2026-05-16
End: 2026-05-17
Location: Key West, Florida

location_city Key West

location_on Florida

flag United States

calendar_today 16 May, 2026 – 17 May, 2026

directions_run Running

language Official Website

About the Event

Registration is open for the 18th Annual race across the islands of the Florida Keys--May 16-17, 2026. 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 or sidewalks and the balance on the road shoulder facing traffic. 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!

Races Offered

100 Mile Team Relay

May 16, 2026

straighten

Distance — 100 Miles

terrain

Type — Road running

timer

05:00

100 Mile Individual Ultra

May 16, 2026

straighten

Distance — 100 Miles

terrain

Type — Road running

timer

05:30

50 Mile Individual Ultra

May 16, 2026

straighten

Distance — 50 Miles

terrain

Type — Road running

timer

09:00

50 Mile Team Relay

May 16, 2026

straighten

Distance — 50 Miles

terrain

Type — Road running

timer

09:00

50 Kilometer Individual Ultra

May 16, 2026

straighten

Distance — 50K

terrain

Type — Road running

timer

12:00

Weather Overview

These values represent the 3-year monthly averages for May in Key West.

Temp (°C)

Feels Like (°C)

thermostat 25.5° / 27.7°

wb_sunny 26.2° / 30.1°

Wind (km/h)

Humidity (%)

air 16.3 /

water_drop 75.8%

Temp (°C)

Feels Like (°C)

Wind (km/h)

Humidity (%)

thermostat 25.5° / 27.7°

wb_sunny 26.2° / 30.1°

air 16.3 km/h

water_drop 75.8%

About Key West

Key West, in the Florida Keys, is a city and an island of the same name. It is the county seat of Monroe County and is considered the southernmost city in the continental United States.