Top 10 Things to Do in September 2026

September is the month the Treasure Valley quietly earns its best-kept secret status. The summer heat breaks, the foothills go golden, and the valley fills with events that make it genuinely hard to choose what to do with your weekends. Hot air balloons over Ann Morrison Park at sunrise. The Lowe Family Farmstead opening its gates for fall — Idaho's original corn maze, pumpkin patch, and hayrides in Kuna. The Hyde Park Street Fair taking over Boise's most beloved neighborhood for a full three-day weekend. FitOne turning the Greenbelt into a community running festival. And the kind of fall foothills hiking that California residents spend significant money traveling to experience.

I moved here from San Diego four years ago, and September is when I finally understood what the fall season actually is — the air crisps, the light changes, and everything about being outside feels different from the summer intensity that preceded it. If you're visiting to scout neighborhoods this month, you picked a good time. Here's the list I'd hand you for September 2026.

If the city guides would help orient you while you're here, start with Boise, Eagle, Meridian, and Star.

1. Spirit of Boise Balloon Classic — September 2–6

The Spirit of Boise Balloon Classic is one of the most visually stunning events in the entire valley, and 2026 marks its 35th anniversary — a milestone year at an event that already has real history and community love behind it. Five days over Labor Day weekend at Ann Morrison Park, Wednesday September 2 through Sunday September 6, with hot air balloons launching from the park at dawn and filling the sky above the foothills. The Nite Glow on Friday, September 4 is the highlight: balloons inflate after dark and light up the park in a synchronized performance that's genuinely different from anything else happening in this city all year. This year the Nite Glow adds a brand-new Inflatable Fun Zone featuring more than 15 attractions — slides, obstacle courses, zip lines, and a mechanical bull — adjacent to the soccer fields at Ann Morrison Park, with tickets required for that section.

The morning launches are free, and they start early — be at the park by 7 a.m. for the best experience as balloons inflate and take flight against the backdrop of the still-gold foothills. Bring a jacket for the morning hours; September mornings here are genuinely cool even when the afternoon will warm up. Food trucks and vendors fill the park each day, and live music runs every evening. Tickets and full schedule at SpiritOfBoise.com.

2. Lowe Family Farmstead Opens for Fall — September 12

September 12 is the date the Lowe Family Farmstead throws open the gates for its 2026 fall season — and if you've never been, this is the year to go. Located at 2500 S Eagle Road in Kuna, the Farmstead is Idaho's original corn maze operation, started by Jim and Hillary Lowe in 1997 as a college project that grew into one of the Treasure Valley's most beloved fall institutions. The 2026 season runs through October 31, closed on Sundays, with hours Monday through Thursday from 4 to 9 p.m. and Friday and Saturday from 10 a.m. to 9 p.m.

Fall admission includes the MAiZE (Idaho's original corn maze), a tractor-drawn hayride, Rusty the Very Big Beast, corn popper jumping pillows, the Bee Line, Feed Mill Ropes Course, pig races, the pumpkin patch, farm animals, barnyard games, the flower field, and farm-fresh food. Single-day admission starts at $21.99 on weekends. For families planning multiple visits, the 2026 season adds a new Two-Visit Ticket option — and the limited Platinum Pass (only 250 available) includes unlimited admission, preferred parking, a 30th Anniversary tumbler with free soda refills, and an invitation to Season Passholder Night on September 10 from 5 to 8 p.m. Children 3 and under are always free. Tickets and season passes at LoweFamilyFarmstead.com.

3. Boise Fall Festival — September 12

The Boise Fall Festival on Saturday, September 12 is a full-day community celebration of the season — held near downtown Boise, open to all ages, and structured around the combination of artisan markets, live music, food trucks serving fall seasonal dishes, and family activities that make it a genuinely easy day to spend outdoors. Families get inflatables, face painting, a jumping pad, and a petting zoo. Adults get a cider tasting garden with craft ciders from regional producers. The market component draws vendors ranging from local artists and makers to seasonal produce and specialty food products that highlight what the valley's fall harvest actually looks like.

September 12 falls in the sweet spot of Boise's early fall — reliably warm afternoons in the low 80s, cool mornings, and the kind of clear blue sky that makes outdoor events look and feel like what the Pacific Northwest version of fall aspires to and rarely delivers. If you're visiting the valley this month with kids, this is one of the easiest family days on the calendar.

4. Hyde Park Street Fair — September 18–20

The Hyde Park Street Fair is Boise's funkiest annual tradition and one of my personal favorites on the entire valley calendar. Three days — Friday through Sunday, September 18 to 20 — in the historic North End neighborhood, centered on Hyde Park and spilling into Camel's Back Park at the base of the foothills. More than 200 vendors fill the streets with local art, handmade jewelry, tie-dye, crystals, vintage clothing, ceramics, woodwork, and creative goods that range from genuinely excellent to wonderfully eccentric. Two music stages run all weekend. The food court is substantial. There are adult beverage tents. A live performance dome runs music, dancing, and workshops continuously.

It's free to attend — has been since 1979 when it started. Parking is notoriously difficult in the North End during this weekend; walk, bike, or use the Boise GreenBike system if you can. Saturday afternoon is the peak crowd, so Friday evening or Sunday morning gives you the event with significantly more breathing room. The neighborhood itself — the streets of Hyde Park on a September Saturday — is genuinely one of the best urban experiences available in this city. More information at NorthEndBoise.org.

5. Eagle Jazz and Blues Festival — September 18–19

The Eagle Jazz and Blues Festival runs the same weekend as Hyde Park Street Fair — September 18 and 19 — making that a genuinely stacked cultural weekend across the valley. The Eagle festival brings world-class jazz and blues musicians to Eagle's State Street corridor, with musicians who regularly perform on the national festival circuit sharing a stage that feels intimate relative to their caliber. If the Hyde Park event is the North End's bohemian answer to fall, the Eagle Jazz and Blues Festival is the more refined, river-adjacent version — the kind of event where you can hear serious music in a beautiful outdoor setting while the Eagle restaurant scene operates at full Saturday capacity around you.

Eagle's dining scene — Crave, Old State Saloon, Vessel Kitchen — is at its most appealing in September, when the evening temperatures drop to the kind of weather that makes outdoor patio dining genuinely perfect. Building a day that combines the Jazz and Blues Festival with dinner at one of Eagle's better restaurants is one of the stronger Saturday plans available in the entire valley this month.

6. St. Luke's FitOne — September 26

FitOne is Idaho's most family-friendly race and one of the largest organized athletic events in the Treasure Valley all year. Saturday, September 26 at Ann Morrison Park and the Boise River Greenbelt, with race options for every level: a half marathon, 10K, 5K, and free registration for kids 12 and under with a paid adult registration. The course winds through downtown Boise, past recognizable landmarks, and along the Greenbelt in a route that's beautiful in September when the cottonwoods along the river start turning.

Even if you're not running, the atmosphere around FitOne is worth experiencing — thousands of participants, a genuine community energy, and the Greenbelt looking its best in early fall light. Registration is open now for all race distances. This is consistently one of the most attended events in the valley's fall calendar and one that newcomers often describe as the moment a relocation starts feeling like a real community rather than a transaction.

7. Thrive: Community Wellness Festival — September 26

The Thrive Community Wellness Festival on Saturday, September 26 at JUMP Boise — the Jump (Jack's Urban Meeting Place) facility downtown — is one of the newer additions to the fall event calendar and a strong one. It's a full-day wellness gathering covering fitness, mental health, nutrition, and community connection, with programming running from 10 a.m. onward. JUMP is one of Boise's most interesting community spaces — a multi-level interactive facility with outdoor areas, event spaces, and a creative energy that makes it a genuinely enjoyable place to spend a morning or afternoon regardless of what's happening there.

September 26 runs concurrently with FitOne, which means the downtown Boise corridor will have an elevated community energy all day. A morning race followed by the wellness festival in the afternoon is a full Saturday that showcases exactly what Boise does well: active community programming at a scale and quality that would cost significantly more to access in a larger metro.

8. Boise Foothills Trails in Peak Fall Condition

September is the single best month of the year to be on the Boise Foothills trail system. The summer heat has broken — September mornings run in the 50s, afternoons climb to the comfortable low-to-mid 80s — the crowds that peak in May and June have thinned, the wildfire smoke that can affect late July and August has generally cleared, and the grass on the hillsides turns a specific gold-amber color that makes the foothills look different from any other time of year. If you're visiting the valley to understand what outdoor life here actually looks and feels like, a morning on the Camel's Back, Hulls Gulch, or Table Rock trail system in September gives you the best possible version of that answer.

The Foothills trails start at the city's edge — no drive, no permit, no reservation. Camel's Back Park at the north end of the North End neighborhood is the most accessible entry point. Military Reserve and Hulls Gulch offer longer loops for more serious hikers and mountain bikers. Bogus Basin's trail system opens to hikers and mountain bikers through the fall as well, adding a higher-elevation option for anyone who wants the full foothills-to-ridge experience. Start before 9 a.m. to have the trails largely to yourself and to catch the September morning light at its best.

9. Eagle Saturday Market — Final Weeks of the Season

The Eagle Saturday Market at Heritage Park in downtown Eagle runs every Saturday from May through September 26 — which means September is the final stretch of the season, and the late-season market is worth making a point of. The harvest is at its richest now: stone fruit, sweet corn, winter squash, apples, pears, late-season tomatoes, and the flower and honey vendors that have been rotating through all summer. Local artists and makers who've been at the market all season have their best work on display, and the smaller end-of-season crowds make it easier to actually talk to vendors.

Heritage Park in Eagle is a beautiful market setting — the river corridor is nearby, the trees are starting to turn by late September, and the market has the feel of an established community tradition (it's been running since 2002) rather than a pop-up event. Pair it with breakfast at one of Eagle's State Street restaurants and you have a genuinely good Saturday morning. The market runs 9 a.m. to 1 p.m. Details at EagleSaturdayMarket.com.

10. Last Weeks of Roaring Springs — Season Ends September 20

Roaring Springs Water Park's 2026 season runs through Sunday, September 20 — which means early September gives you a few final chances to visit the Northwest's largest water park before it closes for the year. September at Roaring Springs has a specific appeal that summer doesn't: the temperatures are still warm enough for the water to feel good (afternoon highs in the low 80s are typical through mid-September), but the crowds have thinned dramatically compared to July and August. If you have a season pass, these are the easiest visits of the year. If you're buying a day ticket, September weekday rates and lower lines make it the most efficient experience of the season.

The connected Wahooz Family Fun Zone remains open past Roaring Springs' close for those who want the go-karts and arcade experience through the fall. For families with young kids who've been going all summer, the final weekend of September 19 to 20 is worth a last visit — the end-of-season energy at a park you've been to all summer has its own particular feel, and September's perfect outdoor temperatures make it arguably the most comfortable Roaring Springs experience of the whole year. Season schedule and tickets at RoaringSprings.com.

Curtis Chism

Licensed Idaho Real Estate Agent • eXp Realty • License #SP56593

September is one of my favorite months in this valley — and if you're visiting to scout neighborhoods, this is a great month to see what daily life here actually looks like. Let's connect while you're in town. Learn more at weknowtreasurevalley.com/about.