Key Biscayne Half Marathon at Miami

Sunday, April 6, 2025 • Key Biscayne, FL • Course Map

An “oasis of sandy beaches, nature preserves and restaurants with stunning views” lies just a short drive across the Rickenbacker Causeway from downtown Miami on this small barrier island that once was a coconut plantation — that’s where you’ll run the KB Bayside Half Marathon, which starts and finishes inside the island’s beautiful Crandon Park.

Runners start the out-and-back course for the race overlooking Crandon Beach, which lies just north of the town of Key Biscayne. From there, you’ll follow the park’s winding roads and trails as they run past the beach and snake around ponds, all the way toward the northern end of the island.

Between mile markers 4 and 5, you’ll run a brief out-and-back stretch along the Rickenbacker Trail, part of an 8 1/2-mile-long trail that runs across the Bear Cut Bridge and past the Miami Seaquarium.

Once you make it back to the causeway, you’ll stay on the trail and head north, running across the bridge and over to Historic Virginia Key Beach Park. There, you’ll run past piers and beach areas while staying on the trail until you hit the turnaround point, between miles 6 and 7.

After that, you’ll make the turn and retrace your steps all the way back across the Bear Cut Bridge and along the Rickenbacker Trail, all the way back to Crandon Park for the race finish.

Race Weather & Climate

Nestled along a barrier island across the Rickenbacker Causeway from Miami, the town of Key Biscayne typically sees relatively mild to warm weather in April, when temperatures here average between the low 70s and the low 80s.

April 6 average low temp: 70°F
April 6 average high temp: 80°F

Past Results

Course Map

See the race route map for the KB Bayside Half Marathon here.

Starting Time

7:00 AM

Fees

$114 and up

Registration

To reserve your spot in the spring 2025 running of Key Biscayne’s KB Half Marathon at Miami, register online here.

Official Race Website

baysidehalfmarathon.com

Comments

Ever run in Key Biscayne’s Bayside Half Marathon? Share your impressions here, especially if there’s anything unique about the course/terrain you think other runners should know.