Why is flying into Denver so bumpy?

In this article · 6 sections

The short answer
How mountains make waves in the air
Why it changes with the seasons
How pilots plan for it
What you can do
Keep reading

The short answer

Denver International sits at about 5,400 feet above sea level (1,656 metres in FAA airport data),⁴ on the plains just east of the Rocky Mountains. When strong wind blows across those mountains, the air on the other side doesn't flow smoothly. It forms waves and swirling eddies, a little like water flowing over rocks in a stream. Flying through that moving air is what you feel as bumps.

It's one of the best-understood kinds of turbulence there is. Forecasters predict it, pilots report it, and airlines plan around it.

How mountains make waves in the air

The FAA's Aviation Weather Handbook explains that when the wind is strong enough and the air is stable, air pushed up and over a mountain ridge overshoots on the way back down, then bounces back up, setting off a series of waves downwind.¹ These are called mountain waves. The handbook classes them as a form of mechanical turbulence, the kind caused by obstacles in the wind's path, like buildings, trees or mountains.¹

A few things from the handbook help explain why the ride can feel uneven:¹

Not every wave is bumpy. The mere presence of a wave doesn't mean trouble; the ride depends on how strong it is and whether it breaks into turbulence.
The effects reach high. Mountain waves can be felt well above the peaks themselves, so you can notice them at cruising altitude as well as on approach.
Rough surfaces and strong wind make more bumps. The stronger the wind and the rougher the terrain, the greater the mechanical turbulence.

Why it changes with the seasons

The handbook says the most severe mountain wind events usually happen when the large-scale winds are strongest, from late autumn to early spring.¹ In the warmer months, it says, hazardous winds near mountains are more often linked to thunderstorms.¹

Summer has its own bumps, too. The handbook describes convective turbulence as most active on warm summer afternoons, when the ground heats unevenly and bubbles of warm air rise. Flying beneath or in puffy cumulus clouds is typically bumpy, while the air above them is generally smooth.¹ That's why a descent through afternoon clouds can feel livelier than the cruise above them.

How pilots plan for it

Forecasts before departure. The NWS Aviation Weather Center publishes turbulence forecasts by altitude for the whole country.³ You can look at the same public information on our turbulence forecast page.
Reports from flights ahead. Pilots send pilot weather reports (PIREPs) about the bumps they find, and air traffic facilities are required to ask for them when moderate or greater turbulence is reported or forecast.² Flights behind can ask for a different altitude or route.
The seat belt sign. Crews often switch it on early for a descent into a mountain airport. That's a precaution, not a warning. See why the seat belt sign stays on.

What you can do

Keep your belt fastened whenever you're seated, snug and low. That's the FAA's main advice for turbulence anywhere.⁵
Choose a seat near the wings if motion bothers you. The airplane pitches around a point close to them, so seats there swing through less of the up-and-down motion. Our seat guide for nervous flyers explains it, without any "safest seat" claims.
Check your flight's briefing. My Flight shows the weather at both ends and the official turbulence outlook, in plain English. The Denver airport guide has live weather and recent pilot reports.

The same mountain-wave physics applies to other airports near big ranges, such as Salt Lake City.

The calm takeaway: Denver's bumps come from wind meeting mountains. It's forecast, reported and planned for every day, and airliners are built to fly through it. Your job is simply to keep your belt on.

Keep reading

Turbulence, explained
Can turbulence make a plane crash?
How do pilots know where turbulence is?
Flying soon? 7 days to your flight walks you through turbulence on Day 2, and the free newsletter sends one calm explainer at a time.

Quick answers

Why is it so bumpy landing in Denver?

Denver sits on the plains just east of the Rocky Mountains. When strong wind blows across the mountains in stable air, it can create waves and eddies downwind, and on summer afternoons rising warm air adds its own bumps.

When is mountain wave turbulence most common?

The FAA's weather handbook says the most severe mountain wind events usually happen when the large-scale winds are strongest, from late autumn to early spring. In summer, bumps near mountains are more often linked to thunderstorms.

Is turbulence near mountains dangerous for an airliner?

Pilots treat it seriously and plan around it using forecasts and reports from other aircraft. For passengers, the FAA's key advice is the same as anywhere: keep your seat belt fastened whenever you're seated.

Do pilots know about it before the flight?

Yes. The Aviation Weather Center publishes turbulence forecasts, and pilots report the bumps they find so flights behind them can plan. Air traffic facilities must ask for reports when moderate or greater turbulence is reported or forecast.

Sources

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Facts last checked against these sources: October 19, 2026.