Best Time to See the Northern Lights in Alaska

Aurora season runs from late August through mid-April, but some months are dramatically better than others. Here's what actually matters.

The Short Answer

The best months for aurora viewing in Alaska are September, October, February, and March. March is the single best month — clear skies, long dark nights, and increased geomagnetic activity around the spring equinox make it the sweet spot.

But it's more nuanced than just picking the right month. Four factors determine whether you'll see the aurora on any given night: solar activity, darkness, cloud cover, and moon phase. Alaska Glow tracks all four in real time.

Month-by-Month Breakdown

August (Late) — Season Opens

Nights start getting dark again around August 21 in Fairbanks. You can catch aurora late at night, but you're fighting short dark windows and residual twilight. Activity can be strong, but the viewing window is tight.

September — Strong Start

One of the best months. The fall equinox (around September 22) creates a spike in geomagnetic activity — this is a real scientific phenomenon, not folklore. The "Russell-McPherron effect" means Earth's magnetic field is more vulnerable to solar wind around the equinoxes. Dark skies return quickly, temperatures are still reasonable (30s–40s°F in Fairbanks), and fall colors add stunning foreground to your photos.

October — Peak Season Begins

Long, dark nights and continued equinox-related activity. Temperatures drop (teens to 30s in Fairbanks), but not brutally cold yet. One of the most reliable months for consistent viewing.

November & December — Deep Winter

Fairbanks gets 20+ hours of darkness in December. That's a lot of aurora time. The tradeoff: temperatures routinely drop to -20°F to -40°F, and ice fog in Fairbanks can obscure viewing. If you're prepared for extreme cold, these months offer the longest viewing windows. Getting outside the city (Cleary Summit, Murphy Dome) helps avoid ice fog.

January — Cold but Clear

Similar to December — extremely cold but with long dark periods. Ice fog remains an issue in town. The cold actually produces clearer skies outside of population centers, making remote locations exceptional.

February — Activity Ramps Up

Daylight starts returning but nights are still long. Temperatures begin to moderate slightly. Solar activity often picks up heading toward the spring equinox. A very good balance of dark time, cold tolerance, and aurora activity.

March — The Best Month

The spring equinox (around March 20) triggers another spike in geomagnetic activity. Skies are generally clearer than fall. Temperatures are cold but manageable (-10°F to 20°F). You still get 10+ hours of darkness. This is the single most recommended month for aurora tourism in Alaska.

April (Early) — Season Winds Down

First two weeks are still viable, especially if a solar storm hits. But by mid-April, the sky doesn't get dark enough for reliable viewing. The season effectively ends April 15–21.

May through August — Midnight Sun

Alaska's famous midnight sun means the sky never gets dark enough to see aurora, even when solar activity is strong. Don't plan an aurora trip between May and mid-August.

What Year Matters Too: Solar Cycle

The sun follows an roughly 11-year activity cycle. We're currently near the peak of Solar Cycle 25, which means stronger and more frequent aurora displays than usual. 2025 and 2026 are among the best years for aurora viewing in over a decade. If you've been putting off an aurora trip, now is the time.

How Long Should You Stay?

The more nights you spend watching, the better your odds. Weather is the biggest variable — even during peak season, clouds can block the view for days. For serious aurora hunters, plan at least 3–5 nights. Statistics from Fairbanks show about a 90% chance of seeing aurora if you spend 3 nights looking. One-night visitors are gambling on weather.