Dagny Johnson Key Largo Hammock Trail

Overview

A rare slice of tropical hardwood hammock right off the Overseas Highway, this flat, easy walk trades ocean views for deep shade, botany, and birds. The full loop is about 2.4 miles total, with a clearly signed cut‑through that trims it to roughly 1.1 miles. Expect interpretive signs, plant ID tags, and a quiet forest feel rather than beach scenery. The park is open from sunrise to sunset with a small per‑person fee collected at an honor box.

Route Options

Start at the stone arch on County Road 905 (just north of U.S. 1 at MM 106). A smooth paved boulevard leads into the hammock—great for wheelchairs, strollers, and anyone wanting a short taste. Continue to the narrower nature‑trail loop for the full 2.4‑mile circuit, or take the signed cut‑through for a shorter 1.1‑mile outing. A brief spur leads to an overlook of a former quarry-turned‑lagoon—one of the few open views on the route.

What You’ll See

This hammock is one of the largest West Indian tropical hardwood tracts in the U.S., with champion trees adapted to coastal Keys conditions. Look for rock walls and exposed fossil reef limestone underfoot—tangible reminders that you’re walking on ancient coral. Wildlife highlights include white‑crowned pigeons in the canopy, mangrove cuckoos and black‑whiskered vireos in season, colorful Florida tree snails on trunks, and a parade of butterflies (zebra longwing, giant swallowtail, Julia) when the sun appears.

Difficulty and Surface

Grades are effectively flat and the footing is straightforward. The first ~0.5 mile is paved and very smooth; the outer loop transitions to compacted gravel and leaf‑littered coral rock. Most hikers will finish the full loop in about an hour; plan a little extra if you linger at signs or the lagoon overlook.

Best Time to Hike

Comfort is best in cooler, breezier months. Early mornings are prime for birds; as the day warms, butterflies become more active. April and October can be especially good for migration. Shade helps year‑round, but insects can be intense in summer or after rains.

Tips and Logistics

Bring strong insect repellent and consider long sleeves. Parking by the archway is limited—arrive early and bring exact change for the honor box. Leashed pets are welcome, and bikes are permitted on paved segments. You’ll find a composting toilet and a picnic shelter along the paved section. If tidal flooding or recent rains have swamped parts of the outer loop, the short loop keeps feet dry.