Idaho tribe pushes Treasure Valley east with new development

The Boise metro’s eastward push took a leap into Elmore County Thursday as Meridian developer Ahlquist and the Coeur d’Alene Tribe unveiled plans for a 920-acre multipurpose development off Interstate 84.

Called Peregrine, the project aims to bring a mix of industrial and commercial business to the Simco Road interchange, a 12-minute drive from Micron’s emerging campus on Boise’s southeastern edge, Ahlquist Director of Marketing Thomas Ahlquist said in a press release.

The plan is the latest attempt to extend the Treasure Valley east toward Mountain Home, reversing its historic growth down the Boise River toward Oregon. The developers are targeting a pair of detached lots immediately adjacent to the Shoshone-Paitue Tribe’s proposed resort and casino, which is being developed in concert with the Coeur d’Alene Tribe.

“A project of this size and ambition reflects the Coeur d’Alene Tribe’s long-standing commitment to thoughtful, lasting economic development, and we are excited to help bring it to the Treasure Valley,” Coeur d’Alene Chairman Chief Allan said in a statement. “This development is an opportunity to meet the needs of Idaho business owners, while also bringing new vitality to the area where we are in the process of helping the Shoshone-Paiute Tribes build their first and only resort and casino.”

The development would similarly bolster amenities for the planned Mayfield Springs and Mayfield Townhomes neighborhoods across the highway. Combined, the pair could bring more than 10,000 homes to the once-vacant steppe along the Ada County line.

“This development partnership will create the new eastern border of the Treasure Valley at the leading edge of one of the region’s most significant future growth corridors,” Thomas Ahlquist wrote in a press release.

Boise metro looks southeast

After decades of westward expansion into the farmland of rural Ada and Canyon counties, Ahlquist’s message Thursday backed a different — and increasingly popular — course.

Peregrine is the latest signal of interest to the south and east of Boise proper, away from the river and into the dry, hard rock of the desert on the road to Mountain Home. Once deemed too challenging — and expensive — to develop at scale, the open space is now drawing businesses lured in part by Micron Technology’s 11-figure investment a short drive away.

“Micron’s investment in Idaho will drive transformational economic growth and create tremendous opportunities across the region,” Ahlquist CEO Tommy Ahlquist said in a statement. “We’re proud to provide a location that can support and accommodate that expansion.”

Elmore County is anchored by the Mountain Home Air Force Base in its seat and largest city. Beyond that, its overwhelmingly rural: The county had between had just short of 30,000 people in 2025, according to the U.S. Census Bureau. That’s fewer people than the city of Kuna alone.

The Peregrine project contemplates a 774-acre industrial and technology park alongside a 126-acre commercial plaza to deliver a “mix of industrial, commercial, service, retail, and residential uses,” according to the press release. Fat City Fireworks currently operates a store on part of the site.

“Ahlquist is honored to partner with the Coeur d’Alene Tribe on a project of this magnitude,” Tommy Ahlquist stated. “As the eastern edge of the Treasure Valley continues to grow, we believe Peregrine will play an important role in shaping the future of this corridor.”