When is hurricane season? Atlantic dates and peak times

The Atlantic hurricane season officially runs from June 1 through November 30 each year. NOAA and the National Hurricane Center set that window based on long-term historical storm climatology — it's the stretch of the calendar where the ocean and atmosphere are reliably warm and unstable enough to support tropical development across the Atlantic, Caribbean, and Gulf.

Those dates don't change year to year. What does change is how active any given season turns out to be — but that's a separate question from when the season happens, which is what this page covers.

"June 1 to November 30" makes the season sound like a flat six-month stretch of equal risk. It isn't. Based on decades of NOAA storm climatology, activity is typically low in June, builds through July and August, and climatologically peaks around September 10.

Put another way: roughly two-thirds of an average season's activity falls in the window between August 20 and October 10. That's the long-term average shape of the season across many years, not a forecast for any single year — some seasons front-load or stretch later than usual — but it's a reliable pattern to plan around.

Occasionally, yes. Named tropical systems have formed just before June 1 or after November 30 in past years — off-season storms are uncommon but not unheard of. That possibility is part of why the National Hurricane Center monitors the tropics essentially year-round rather than switching off outside the official window.

Still, the large majority of activity falls within June 1 to November 30. Off-season storms are the exception that proves the rule, not a reason to treat the calendar dates as meaningless.

Because activity ramps up rather than starting at full strength on June 1, the best time to build a kit and learn your evacuation zone is before June — or at the very latest, before activity ramps up in August. See the hurricane prep checklist for exactly what to do and in what order.

Once a storm is named nearby, both supplies and time get scarce fast — store shelves empty out and there's no time left to plan a route or find your evacuation zone. Doing that work early, while the season is still quiet, is what makes a real difference. Check the live tracker any time you want to see what's active in the basin right now.

Can a hurricane form outside the official season dates?

Yes, occasionally. Named tropical systems have formed just before June 1 or after November 30 in past years, but the large majority of Atlantic activity still falls within the official June 1–November 30 window.

When does hurricane season typically peak?

Climatologically around September 10. Activity is usually low in June, builds through July and August, and roughly two-thirds of an average season's activity falls between August 20 and October 10.

Is the Pacific hurricane season the same dates as the Atlantic?

No — HurriTrack only covers the Atlantic basin. The Eastern Pacific season runs on a different calendar, starting in mid-May and continuing through November.

How early should I start preparing?

Before the season starts, ideally by the end of May. Once activity ramps up in August, supplies and time both get scarce fast.