El Niño 2026-27: What it means for mountain bike trails

Is El Niño happening in 2026?

Yes. NOAA's September 10, 2026 ENSO discussion reports that El Niño is strengthening. It gives a greater than 90% chance of a very strong event during Northern Hemisphere fall and winter 2026-27.

That probability describes the strength of the Pacific climate event. It is not a 90% chance of rain at your local trail, and it does not tell you how many winter weekends will be rideable.

What El Niño changes, and what it does not

El Niño is the warm phase of a coupled ocean and atmosphere pattern in the tropical Pacific. Changes in Pacific water temperatures and winds can influence the jet stream and where storms travel. Its effects are often most noticeable in North American winter, but they are not identical everywhere.

The phrase "super El Niño" is an informal description, not a promise of a super-wet winter. USGS's 2026 El Niño explainer emphasizes that a stronger event can make some regional tendencies more likely without guaranteeing them.

For riding, treat the outlook as background for your winter plans, not a reason to cancel a season or book a supposedly weatherproof destination. A forecast for a three-month period cannot tell you whether a particular Saturday will have firm dirt.

What the 2026-27 outlook means in different regions

The regional picture below combines NOAA's September 17 seasonal outlook with the limits of El Niño as a local predictor. These are broad seasonal tendencies, not trail-condition forecasts.

California

NOAA favors above-normal winter precipitation across California. That is a reason to keep your riding plans flexible around storms, not to assume every week will be washed out.

There is an important distinction between this year's full seasonal forecast and El Niño alone. USGS's Southwest assessment notes that El Niño on its own is a less reliable precipitation guide for Northern California, and does not reliably predict the atmospheric rivers that can dominate a season. The strong 2015-16 event also left Southern California and Arizona dry, a useful counterexample to the idea that strength guarantees rain.

For Bay Area riders, use the Bay Area after-rain guide to plan around local ground and exposure rather than a statewide headline.

Arizona and the Southwest

The southern United States, including much of the Southwest, has wetter-than-normal odds in NOAA's winter outlook. Keep a backup for a rainy trip rather than treating desert riding as a guaranteed escape.

Our Phoenix and Scottsdale and Sedona after-rain guides explain the local checks. Use those alongside current access notices and weather, not as promises about the coming season.

Washington, Oregon, and the inland Northwest

Do not reduce this year's outlook to "the Northwest will be dry." NOAA's September forecast distinguishes a modest dry signal in the interior Northwest from wetter winter odds that can extend into central Oregon.

USGS's Northwest assessment describes the historical tendency toward warmer, drier El Niño winters, but also documents wet exceptions. A seasonal dry tilt does not rule out large coastal storms or long stretches of wet ground.

Keep low-elevation trail conditions separate from mountain snow conditions. The Seattle and Snoqualmie after-rain guide is a better starting point for a ride-day decision than a Pacific Northwest average.

The southern and eastern United States

NOAA's winter outlook favors wetter conditions across much of the South and along the Atlantic coast. That does not give every trail in this broad area the same recovery time.

For riders in western North Carolina, the Pisgah and Brevard after-rain guide provides a local starting point. Check the actual network and its access notices rather than applying a coastal or statewide forecast to a mountain trail.

The gap between storms matters at the trailhead

A wet seasonal forecast leaves out a detail riders need: how the rain is distributed. Imagine two hypothetical months with the same total rainfall. One gets most of it in a short cluster of storms, followed by a long break. The other gets smaller amounts repeatedly, with little time between them. The total is the same; the opportunities to assess recovering trails are not.

This is an illustration, not a Loam simulation or a prediction of rideable days. A long break after heavy rain is not automatically enough, either. It still matters how much water the ground holds and what happens during the break.

USGS's explanation of infiltration shows why previous rain matters: saturated soil has little room for additional water, which increases runoff. Rain intensity, soil, and land cover also affect how water moves into and across the ground.

Daily water accounting is different from a seasonal rainfall total. The processes described in USGS's soil-water-balance work include retained moisture, evaporation and plant water use, canopy interception, and snowmelt. Loam is not that USGS model, but these are reasons to look at recent conditions and the weather ahead rather than a single winter headline.

Our guides to how much rain is too much, why nearby trails dry differently, and shade, sun, and trail drying connect those questions to the ground you ride.

Less snow would not automatically mean more riding

Snow is not simply a wetter-or-drier question. The USGS Northwest assessment explains that temperature during storms matters, especially where winter temperatures are near freezing. A warm seasonal average alone does not settle how much snow a particular elevation receives.

The practical distinction for riders is simple: snow-free is not the same as firm. Check the surface instead of treating exposed dirt as an invitation. Ground that gives under your shoe or leaves a rut under a tire needs a different plan, regardless of the season's snow total. Use the trailhead firmness check before committing.

How to plan a ride this winter

Start with the land manager's current rules and closures. Then check recent rain, the local forecast, and the condition estimate for the network you intend to ride. Look again close to departure rather than relying on an outlook you read weeks earlier.

At the trailhead, check the ground itself. If your tires sink, leave ruts, or collect thick mud, turn back. A route with a soft connector is not made ready by a dry entrance, and a seasonal forecast never overrides an official closure.

Check current trail conditions in Loam. Loam estimates conditions from recent weather, soil, terrain, and canopy; it does not directly measure the trail surface. Read how the estimate works and use it to narrow your choices, not to overrule what you find on arrival.

When does the forecast get updated?

NOAA lists October 8, 2026 for its next ENSO discussion and October 15, 2026 for the next seasonal outlook. The linked NOAA pages change as new outlooks are issued; the dates at the top of this article identify the versions used here.

The useful takeaway for winter 2026-27 is not a fixed number of days to wait after rain. It is to plan around actual storms and local recovery, keep an alternative when the ground is soft, and check again before you ride.

Sources and method

Loam estimates conditions from weather, soil, and terrain. It does not measure the trail surface directly or override an official closure. Read how the estimate works and see the published checks and their limits.

• USDA NRCS: Hydrologic Soil Groups, soil infiltration and runoff.
• USGS: Infiltration and the Water Cycle, saturation, land cover, and slope.

These references explain physical processes, not the accuracy of Loam's predictions.

See Loam's data providers and editorial process.