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Things to Do in the Treasure Valley in September 2026 | Events Guide

Mike Brown Group

September is when the Treasure Valley trades pool days for festival season. The Spirit of Boise Balloon Classic fills the sky over Ann Morrison Park September 2–6, three major festivals collide on the same weekend in Boise’s North End September 18–20, and Oktoberfests take over the valley as the weather cools. Add a packed concert calendar, weekly farmers markets, and back-to-school family events, and September is one of the busiest — and most walkable — months of the year to be outside in Boise, Meridian, Nampa, Caldwell, and Eagle.

Below is the complete guide to things to do in the Treasure Valley in September 2026, organized by category so you can jump straight to concerts, festivals, family events, or farmers markets.

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Quick Answer: What’s Happening in the Treasure Valley in September 2026

The biggest events in the Treasure Valley in September 2026 are the Spirit of Boise Balloon Classic (September 2–6, Ann Morrison Park, Boise) and a single blockbuster weekend on September 18–20 when the Hyde Park Street Fair, Boise Pride Festival, 23rd Annual Indian Creek Festival (Caldwell), and Boise Scottish Heritage Festival all overlap. The month also features 50+ concerts (headlined by Bonnie Raitt, Foster The People, and Godsmack), three separate Oktoberfest celebrations on September 26, the World Village Festival, the Boise Fall Festival, and five weekly Saturday farmers markets across Boise, Meridian, Eagle, and Nampa. This guide covers every confirmed event by category, date, and city.

Marquee Events: Spirit of Boise Balloon Classic & Boise’s Biggest Festival Weekend

The two events most people search for — the Spirit of Boise Balloon Classic and the North End festival weekend — anchor September in the Treasure Valley. The Balloon Classic runs five mornings, September 2–6, over Ann Morrison Park in Boise. The following two weekends later, four separate festivals converge on September 18–20 in and around Boise’s North End and Caldwell.

Concerts & Live Music in the Treasure Valley — September 2026

September has 50+ live music events across Boise venues, headlined by Bonnie Raitt (September 10), Foster The People (September 19), and X-FEST: Godsmack (September 26). Below is the full night-by-night lineup, earliest to latest:

Festivals & Community Events in the Treasure Valley — September 2026

Beyond the balloon classic and the North End’s big weekend, the Treasure Valley hosts more than 20 additional festivals and community events in September, spanning Boise, Nampa, Meridian, and Caldwell — including three Oktoberfest celebrations that all fall on September 26.

Family-Friendly Events in the Treasure Valley — September 2026

Back-to-school doesn’t mean the fun stops. The best family-friendly picks for September 2026 include four Zoo Boise events, the Kids Discovery Expo and Space Day (both September 12), and Potato Days closing out the month.

Stay Active: Outdoor & Fitness Events in the Treasure Valley — September 2026

September’s active calendar centers on 9/11 remembrance events (September 11–12) and closes with the FitOne Half Marathon on September 26.

Treasure Valley Farmers Markets — September 2026

Five Saturday farmers markets and one Tuesday evening market run throughout September across Boise, Meridian, Eagle, Nampa, and Caldwell:

Frequently Asked Questions About September 2026 Events in the Treasure Valley

What are the biggest events in the Treasure Valley in September 2026?

The Spirit of Boise Balloon Classic fills the sky over Ann Morrison Park September 2–6, and the weekend of September 18–20 brings the Hyde Park Street Fair, Boise Pride Festival, the 23rd Annual Indian Creek Festival, and the Boise Scottish Heritage Festival all at once — making it the busiest festival weekend of the month.

What concerts are happening in the Treasure Valley in September 2026?

September’s lineup includes Bonnie Raitt, Foster The People, Godsmack, Theory of a Deadman & Sevendust, Cannons, Thievery Corporation, and dozens more shows spanning nearly every night of the month across the valley’s concert venues.

What family-friendly events are in the Treasure Valley in September 2026?

Top picks include Wild After 5 and International Red Panda Day at Zoo Boise, the Kids Discovery Expo and Space Day on September 12, the World Village Festival September 11–12, and Potato Days 2026 closing out the month September 25–27.

What festivals are happening in the Treasure Valley in September 2026?

Beyond the North End’s big weekend, September brings the Taste of Caldwell Harvest Festival, Art in the Park, the Boise Fall Festival, Xtreme Barrel Race, and three separate Oktoberfest celebrations (Boise Oktoberfest, Old Boise Oktoberfest, and Octoberfest at Payette Brewing) all wrapping up the month on September 26.

Where are the weekly farmers markets in the Treasure Valley in September 2026?

Five markets run every Saturday — Boise Farmers Market, Capital City Public Market, Meridian Main Street Market, Eagle Saturday Market, and Nampa Farmers Market — plus the Farm to Fork Farmers Market every Tuesday evening in Caldwell.

What outdoor and active events are happening in the Treasure Valley in September 2026?

Active options include the Smoke ‘n’ Fire 400 ultra race on September 3, the 9/11 Miles of Remembrance Run and ISU’s 9/11 Memorial Stair Climb, the Tobin Bolter Memorial Kids’ Duathlon on September 12, and the FitOne Half Marathon closing out the month on September 26.

Living in the Treasure Valley

The Treasure Valley isn’t just one of the fastest-growing regions in the country — it’s one of the most livable. A fall calendar this full is part of what makes communities like Meridian, Eagle, Star, Nampa, and Boise so desirable for families, first-time buyers, and people relocating from other states.

If you’re thinking about buying or selling a home in the Treasure Valley, The Mike Brown Group would love to help. We’re a team of 30+ agents based in Meridian, and we’ve spent years helping people find not just a house, but a neighborhood they love to come home to.

Contact our team today or search available homes in the Treasure Valley.

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