Ice Runway: Alton Bay’s Unique FAA Ice Strip on Lake Winnipesaukee

Each winter, when the waters of Lake Winnipesaukee freeze solid and conditions are right, something remarkable happens: part of the frozen lake becomes one of the only FAA-approved ice runways in the Lower 48. That’s Alton Bay’s seasonal ice strip, a rare aviation attraction unique to New Hampshire’s largest lake.

How It Works

When ice thickness and surface conditions meet strict Federal Aviation Administration criteria, pilots can use part of the frozen bay as a landing and takeoff zone. The runway is cleared and marked, with carefully measured ice depths to ensure safety. As of recent records, Alton Bay’s runway has held when ice is reliably over 12–14 inches—but weather and temperature swings demand continuous monitoring.

Timing & Access

The ice runway typically opens in late December or early January—depending on winter conditions—and remains usable only until early spring. It’s a seasonal curiosity: pilots often monitor local condition updates and aquatic forecasts before attempting a landing. Because it is literally on ice, the runway is closed when snow cover, thawing, or unsafe ice renders it unusable.

Safety & Best Practices

If you’re observing or curious, here are a few tips:

• Don’t drive or walk on the ice near the runway unless designated safe zones are noted.
• Check local aviation bulletins and lake-community postings.
• Respect posted boundaries.
• Though landings are rare, seeing small aircraft touch down on the frozen lake is a memorable winter spectacle.

For local residents and aviation enthusiasts, the Alton Bay ice runway adds a dash of wonder to a winter in the Lakes Region—when the lake solidifies, it transforms into both a frozen waterway and an airstrip. Keep your eyes to the skies (and the ice) in December and January.