Alton Bay Ice Runway, the Only FAA-Charted Ice Strip in the Lower Forty-Eight, Where You Land Your Airplane on a Frozen Lake and Taxi Past the Ice Fishermen

SUMMARY: Alton Bay (B18) on Lake Winnipesaukee is the only FAA-charted ice runway in the lower 48 - here’s how it works and how to fly it.

Alton Bay (identifier B18) on New Hampshire’s Lake Winnipesaukee is the only FAA-charted ice runway in the lower 48 states - an actual runway plowed onto a frozen lake and printed on the aeronautical chart. It exists only a few weeks each winter, when the ice grows thick enough and the cold holds long enough, and pilots fly in from all over to land on the ice and taxi past ice-fishing shanties. When a thaw arrives, it closes, sometimes for the season.

Where Is the Alton Bay Ice Runway?

Alton Bay sits at the southern tip of Lake Winnipesaukee, the largest lake in New Hampshire. In summer it’s boats, floatplanes, and vacation cottages - postcard country, with a twisting shoreline, scattered islands, and mountains standing up behind it.

In winter, the bay freezes, and a small crew of locals goes out with plows to carve a runway into the ice. Unlike a concrete airport that’s simply there year-round, this runway has to be rebuilt every single winter. Some years it barely opens. Some years it doesn’t open at all.

How Does an Ice Runway Actually Work?

You can’t just point an airplane at any frozen lake. The ice has to be genuinely thick - a solid foot of good, hard, clear ice at a minimum before anyone puts a single-engine airplane down on it. The people who run the operation drill test holes and measure the thickness repeatedly.

The plowed layout is a real airport footprint scraped onto the lake: a main runway of roughly a couple thousand feet, a parallel lane, and a parking area, all cleared down to the ice and marked out.

The whole thing runs on NOTAMs and trust. When the ice is ready, the word goes out that B18 is open. When a warm spell moves in, the snow gets deep, or something doesn’t feel right, it closes again - sometimes fast. Check the status every time before you go, because the answer changes.

What Is It Like to Land on Ice?

Approaching down the lake, you get mountains off your wing and frosted-white islands below, and where the bay narrows to its southern tip, the plowed runway appears as dark lines drawn on a sheet of white, with little airplanes parked along the edge.

The touchdown itself is often the easy part. One pilot who flew in from a couple of states over in a taildragger said the landing was smoother than half the pavement he flies off at home. Good ice, plowed flat, is glass - dead level, no crown, no potholes, no frost heave. It may be the flattest runway you’ll ever roll onto.

The challenge is that ice is ice:

Braking is minimal - your tires aren’t gripping much of anything.
Come in slow and stable, and let the airplane roll out long rather than trying to stop it quickly.
Stay active on the rudder - a gust can push you sideways on a near-frictionless surface.
Ski-equipped aircraft play their own game, but most traffic is on wheels, flying gentle and conservative.

What Happens on the Ice at Alton Bay?

Shut down and climb out, and you’re in the middle of a winter carnival. Ice fishermen sit in shanties with lines down through the holes while a Piper is parked forty yards away, and nobody thinks it’s strange. People drive cars onto the lake. There are kids, dogs, and townsfolk who skated or walked out just to watch airplanes land on the water they swim in every summer.

Between airplanes it’s dead quiet - cold, still, snow absorbing every sound - until a Cessna comes around the bay and the whole crowd turns to watch it settle onto the ice. And you can hear the lake itself: Winnipesaukee groans, cracks, and booms as the ice shifts and settles, deep sounds rolling under your boots. The locals don’t flinch. That’s just the lake breathing.

Walk off the ice and up the ramp into the town of Alton Bay and you’ll find coffee, hot chocolate, and a warm seat. This is the “hundred-dollar hamburger” like nowhere else, because the walk from your airplane to your lunch crosses the ice, past fishing holes, with the mountains looming over everything.

Who Runs the Ice Runway?

This runway exists because people refuse to let it disappear. It’s not the FAA or an airport authority out there with plows - it’s a handful of local families who have taken it on year after year, in some cases across generations. Winter aviation on Winnipesaukee goes back a long way; it’s tradition, and it returns each season only because someone chooses to bring it back.

The people running it read the ice, run the equipment, plow in the cold and dark, and carry the weight of the open/closed call, because pilots’ lives ride on their judgment about ice thickness. The thing they watch most isn’t the airplanes - it’s the warm days. The cold is the friend here; a thaw is the enemy, and a few warm afternoons can force a shutdown. Their job is to make that call before the lake makes it for them.

How to Fly Into Alton Bay Safely

If you want to do this - and you should - do it right:

Check the NOTAMs every single time, right up until you launch.
Listen to the people who run it. Their word on the ice is final.
Fly your own airplane and your own limits, respecting reduced braking and crosswind on a slick surface.
If the ice report or your gut says no, it’s no. There’s always next winter.

This is temporary, fragile flying - a gift winter hands you and then takes back. There is no “sometime.” There’s this week, maybe, if the cold holds and the ice is thick and the NOTAM says come. When it’s open, you go.

Key Takeaways

Alton Bay (B18) on Lake Winnipesaukee is the only FAA-charted ice runway in the lower 48 states, open only a few weeks each winter when conditions allow.
The ice must be at least a foot of solid, clear ice, verified by drilled test holes, before aircraft operate; the plowed layout includes a ~2,000-foot main runway, a parallel lane, and parking.
Operations run entirely on NOTAMs managed by local volunteers - always check status right up until launch, and treat their call as final.
The flat ice often lands smoother than pavement, but braking and traction are minimal - fly slow, stable, and stay on the rudder.
The runway is maintained by local families, not the FAA, and the biggest threat isn’t cold but a thaw, which can close the field quickly.