Old Idaho Penitentiary

State: Idaho. Type: historic former prison and museum in Boise, operated by the Idaho State Historical Society. Built beginning in 1870 as the Territorial Prison; housed inmates from 1872 until December 1973 (101 years). More than 13,000 people were incarcerated here; peak population never exceeded about 600. Ten executions by hanging were carried out on-site, the last in 1957. Listed on the National Register of Historic Places since 1974. Address: 2445 Old Penitentiary Rd., Boise, ID 83712. Phone: (208) 334-2844.

The Old Idaho Penitentiary is a preserved 19th- and 20th-century prison on the eastern edge of Boise that today operates as a museum under the Idaho State Historical Society. Construction began in 1870, while Idaho was still a territory, and the first inmates arrived in 1872; the prison then operated for 101 years until it closed in December 1973. Over that century it held more than 13,000 prisoners, though the population inside its sandstone walls never exceeded about 600 at one time. Much of the complex was built by convict labor, with inmates quarrying sandstone from the nearby ridges to raise the imposing 17-foot perimeter wall, cell houses and other buildings. Visitors can walk through original cell blocks, solitary confinement, the gallows and the site's other historic structures, learning the stories of notorious inmates such as Harry Orchard, who assassinated a former Idaho governor, and Lyda Southard, dubbed Idaho's "Lady Bluebeard." A series of riots in the 1950s through 1973 hastened the prison's closure and the transfer of inmates to a modern facility south of Boise. The grounds also host rotating exhibits, and the adjacent Idaho Botanical Garden occupies the prison's former recreation yard.

The Old Idaho Penitentiary sits at 2445 Old Penitentiary Road in the foothills on the eastern side of Boise, Idaho, in Ada County, a short drive from downtown. It is tucked against the Boise foothills at the mouth of a canyon from which inmates quarried the sandstone used to build it. The adjacent Idaho Botanical Garden and several state historical facilities share the surrounding area.

Boise has a cold semi-arid, high-desert climate, receiving only about 10 to 15 inches of precipitation a year. Summers are hot and dry: daytime highs top 90 degrees Fahrenheit on roughly 60 days a year and reach 100 degrees several times, though low humidity and large day-to-night temperature swings make evenings cooler. Winters are cold but relatively dry, with January lows around 24 degrees and modest annual snowfall of roughly 18 to 20 inches. Spring is the wettest season and summer the driest.

The penitentiary is open year-round, but spring and fall generally offer the most comfortable weather for touring the largely outdoor grounds, avoiding both the peak summer heat and winter chill. Summer brings the longest hours (10 a.m. to 5 p.m.) and is popular with families, while winter shortens hours to midday. The site is well known for its Halloween-season programming, which draws crowds in October. Weekday visits tend to be quieter than weekends.

Idaho's territorial legislature authorized a penitentiary, and construction of the first building began in 1870 near Boise; the prison received its first inmates in 1872. Over the following century it grew into a walled complex of cell houses, a dining hall, shops and other structures, much of it built with sandstone quarried and laid by the prisoners themselves. The 17-foot perimeter wall enclosed a population that peaked around 600 but never higher, even as more than 13,000 individuals passed through over the prison's lifetime. The site carried out 10 executions by hanging, the last in 1957. Among its most infamous inmates were Harry Orchard, who assassinated former Governor Frank Steunenberg with a bomb in 1905, and Lyda Southard, Idaho's "Lady Bluebeard," convicted of poisoning husbands for insurance money. Deteriorating conditions and a series of riots in 1952, 1971 and 1973 led the state to close the aging prison; on December 3, 1973, the last 416 inmates were transferred to a new correctional institution south of Boise. The site was listed on the National Register of Historic Places in 1974 and is now preserved as a museum by the Idaho State Historical Society.

Visitors explore the historic prison grounds on self-guided or guided tours, walking through original cell houses, solitary confinement ("the Cooler"), the dining hall, the gallows and the sandstone-walled yard. Interpretive exhibits tell the stories of the prison's inmates, escapes, riots and executions, and the site houses additional displays, including a historic arms and weapons collection. Guided tours led by staff go deeper into the prison's history for an added fee. Seasonal and after-hours events, especially around Halloween, add to the calendar. Many visitors combine the tour with a stroll through the adjacent Idaho Botanical Garden.

Key structures on-site include the original 1870s cell house, later cell blocks, the Siberia and solitary-confinement areas, the gallows where executions were carried out, the dining hall, and the towering sandstone perimeter wall built by convict labor. Interpretive galleries cover the history of Idaho's prison system, and the site has hosted a notable historic weapons collection. Immediately adjacent, the Idaho Botanical Garden occupies the former prison recreation yard, and other Idaho State Historical Society facilities are nearby.

The penitentiary is on the eastern edge of Boise, a short drive from downtown via Warm Springs Avenue to Old Penitentiary Road. Boise Airport (BOI) is the nearest commercial airport, roughly 15 to 20 minutes away by car, where visitors can rent vehicles or use rideshare. Once in Boise, driving or rideshare is the easiest way to reach the site; there is on-site parking. Boise's local bus system serves parts of the city, though a car or rideshare is the most convenient option.

As of research, summer hours (Memorial Day through Labor Day) were 10 a.m. to 5 p.m. daily, with last admission at 4 p.m., and winter hours were 12 p.m. to 5 p.m. daily, again with last admission at 4 p.m. The site is closed on major state holidays. Guided tours are offered most days for an additional fee, with times varying by weather and staffing. Confirm current hours and tour times on history.idaho.gov or by calling (208) 334-2844 before visiting.

As of research, general admission was $9 for adults (ages 13 and up), $7 for seniors (60+), $5 for children ages 6-12, and free for children under 6 and for members. Discounts are available for AAA cardholders, students, veterans and EBT cardholders (through Museums for All); AAA and student discounts require showing ID. Guided tours cost an additional $2. Confirm current pricing on the Idaho State Historical Society website before you go.

Most visitors spend about one to two hours exploring the cell houses, gallows and exhibits; taking a full guided tour or lingering over the interpretive displays and the adjacent Idaho Botanical Garden can extend a visit to half a day.

The penitentiary is within the city of Boise, so visitors have access to the full range of the city's lodging, from downtown hotels a few minutes' drive away to chain hotels near Boise Airport and the interstate, plus bed-and-breakfasts and vacation rentals. The historic East End and Warm Springs neighborhoods lie between the site and downtown. Because it is an in-city attraction, most visitors stay at a Boise hotel rather than near the site specifically.

There are limited dining options immediately at the site, but downtown Boise, a short drive west, offers a wide range of restaurants, cafes, breweries and food options from casual to fine dining. The nearby Warm Springs and East End areas also have some eateries. Many visitors pair the tour with a meal downtown or a picnic near the adjacent Idaho Botanical Garden.

The Idaho Botanical Garden sits immediately adjacent, on the prison's former recreation yard. The Boise foothills and the Ridge to Rivers trail system rise just behind the site for hiking and biking. Downtown Boise, with the Idaho State Capitol, the Basque Block, the Boise Art Museum and the Boise River Greenbelt, is a short drive away and makes for an easy add-on. Other Idaho State Historical Society sites are also nearby.

Boise Airport (BOI) is the nearest commercial airport, about 15 to 20 minutes away by car. Boise's Valley Regional Transit bus system serves parts of the city. In practice, most visitors reach the site by personal car, rental car or rideshare, and on-site parking is available.

The historic buildings have uneven floors, steps and low doorways, so wear sturdy shoes and watch your footing, especially in older cell blocks. Much of the tour is outdoors, so bring sun protection and water in summer and warm layers in winter. Supervise children around the historic structures. The Boise foothills location can be hot and exposed in summer. For any emergency, dial 911.

Comfortable, closed-toe walking shoes for the grounds and cell houses, sunscreen, a hat and water for the exposed outdoor areas in summer, and warm layers in winter are all worthwhile. A camera is popular for the historic architecture, and cash or a card is useful for admission and the optional guided-tour fee.

Check current hours before visiting, since they change seasonally (longer in summer, shorter midday hours in winter). Consider adding the optional guided tour for deeper historical context, and pair the visit with the adjacent Idaho Botanical Garden. October Halloween-season programming is popular and may require advance tickets. Look for available discounts (AAA, student, veteran, EBT) if eligible, and allow extra time on busy weekends.

For any emergency, dial 911. For non-emergency visitor questions, the Old Idaho Penitentiary can be reached at (208) 334-2844 or oldidahopen@ishs.idaho.gov, per the Idaho State Historical Society's official information.

Old Idaho Penitentiary, Idaho State Historical Society - https://history.idaho.gov/oldpen/

This section is being updated and will be available shortly.

This section is being updated and will be available shortly.

This section is being updated and will be available shortly.