The easy downtown stop
Market on Main holds its final Saturday market of the 2026 season from 9 a.m. to 2 p.m. on the 100 block of Main Avenue North in Twin Falls. The organizer says the market runs rain or shine.
Arrive when it suits you, walk the block, and leave without arranging a fixed start. “Rain or shine” does not promise that every vendor will be present, so check current updates if a particular vendor is the draw.
The one that requires real preparation
The Outlaw Trail Ultra Half Marathon starts Saturday at 7 a.m. near Diamondfield Jack Campground and Third Fork. Despite the name, the organizer describes a roughly 14.5-mile point-to-point course on rough jeep and ATV roads followed by singletrack. Registration is listed at $85 plus tax and fees, with a 200-runner cap.
Packet pickup is Friday from 5 to 7 p.m. at Northern Ridge Park, with a race-morning option. Entries are not refundable or deferrable. Read the full course and transport information before registering.
Horse show by day, stars after dark
Magic Valley Reined Cow Horse is scheduled Wednesday through Sunday at the Twin Falls County Fairgrounds in Filer. Spectator admission and daily class times were not clear in the sources reviewed, so confirm those details before making a special trip.
Saturday night, the Herrett Center’s free monthly star party runs from 9:45 to 11:45 p.m. and is timed for a moonless sky. Telescope viewing is weather-dependent, so check the observatory's current event information before leaving home.
Check the details
Dates and rules can change. These are the organizer and venue pages used for the practical details in this guide.
- Market on Main
Closing date, hours, location, and rain-or-shine policy
- Outlaw Trail Ultra Half Marathon
Race time, distance, terrain, price, cap, packet pickup, and refund policy
- Twin Falls County Fair event calendar
Magic Valley Reined Cow Horse dates and fairgrounds listing
- Centennial Observatory events
Free star party, time, moon conditions, and weather dependency