Fright Nights at the Old Idaho Penitentiary
Haunted attraction · Idaho
The state's actual 19th century territorial prison turns into a haunted house for adults only nights each October, with actors working the old cell blocks and infirmary where inmates really lived and died. It bills itself as Idaho's only haunted cell house, and it is not exaggerating.
Don’t miss
Plan your visit
Color nearby peaks: October 13–October 17
Color builds from September 30 · mostly bare by November 5
Method: daily ERA5 temperatures drive a photoperiod + chilling phenology model, sampled at Fright Nights at the Old Idaho Penitentiary’s own coordinates and elevation (848 m) rather than a regional average. Estimates, not promises — check locally before you plan a trip around it.
Fright Nights at the Old Idaho Penitentiary on the map
More things to do in Idaho
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Scenic drivePeak September 27
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Don’t miss: Pine Creek Pass at 6,754 feet · Backside view of the Tetons
The Farmstead Corn Maze & Pumpkin Festival
Fall festivalColor nearby peaks October 17
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Don’t miss: Fresh corn maze each year · Pumpkin patch and hayrides · One-price general admission
The Haunted World
Haunted attractionColor nearby peaks October 18
Billed as Idaho's largest indoor-and-outdoor haunt, this attraction sprawls across more than 40 acres of Caldwell farmland west of Boise, pairing a themed haunted house with a corn maze that runs over a mile long. It has been scaring visitors since 2000, and a full walk-through takes roughly two hours on weekends.
Don’t miss: 40+ acres of haunt · Mile-long corn maze · Running since 2000
Ten Mile Farms
Corn mazeColor nearby peaks October 17
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Don’t miss: Family and full-sized corn maze routes · U-pick pumpkin patch · Hayrides and barrel train
Frequently asked
- When does Fright Nights at the Old Idaho Penitentiary peak in 2026?
- Peak color is predicted for October 13–October 17 (best estimate October 15). Color starts around September 30 and is mostly bare by November 5.
- What is Fright Nights at the Old Idaho Penitentiary best for?
- Boise haunt fans who want real history under the scares.
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