10,000-plus homes are planned east of Boise toward Mountain Home

October 15, 2026 · Treasure Valley · Spencer Southey

BoiseDev reports that more than 10,000 homes are planned or underway east of Boise between the Micron area and Mountain Home. That's a real shift for a valley that has spent generations expanding west, and it's one of the clearest signs yet that the southeast side is becoming a major growth corridor.

What stands out to me is that this isn't one project. It's a stack of projects across both Ada and Elmore counties, all at different stages. If you only look at the total home count, you miss the part that matters most for buyers and nearby owners: where these communities sit, how they'll be accessed, and how long it could take for any of this to feel built out.

The biggest projects in the pipeline

BoiseDev's roundup points to several major developments east of Boise:

Mayfield Springs: about 2,325 homes, under construction off the Mayfield exit in Elmore County
Settler Springs Village at Mayfield Ranch: entitlements for 3,000 homes, with a preliminary plat showing just over 1,400 homes
Radiance: more than 6,800 homes on about 1,200 acres across Interstate 84 from Micron
Palm Estates: 83 one-acre-lot homes at the Simco Road exit
Ridgeview Estates: 22 multi-acre lots across 105 acres

BoiseDev also reported that Mayfield Townsite is a 5,000-acre property east of Mayfield Springs with potential for 15,000 homes, and that Third Cadence is developing 1,400 acres within that larger townsite.

So while the article headline focuses on 10,000-plus homes planned now, the long-range scale east of Boise could be much larger.

Why location and access matter

The map matters here as much as the unit counts.

BoiseDev reported Mayfield Springs is in Elmore County, but residents will largely access the community via Desert Wind Road in Ada County. That's the kind of detail I always tell people to watch, because a project's county line doesn't always match the roads you'll actually use every day.

Radiance sits across I-84 from Micron's expanding Boise campus, according to BoiseDev. In its Oct. 5 coverage, BoiseDev said the concept shown at a neighborhood meeting included:

3,782 single-family homes
3,050 apartments

That same BoiseDev report said the site lies on both sides of the Boise School District and West Ada School District boundary line. For buyers, that is a check-the-map item, not a assume-it-later item.

At Simco Road, BoiseDev reported Peregrine is planned as a commercial and industrial project by Ahlquist and the Coeur d'Alene Tribe, with a small residential site included.

What happens next

These projects are not all moving on the same clock.

Mayfield Springs is already being built in multiple phases, BoiseDev reported. Elmore County staff materials identify it as preliminary plat application MSPC-PP-2023-01.

BoiseDev reported that Settler Springs is still in early planning, with the development team meeting with service providers on infrastructure as of a July 2026 report.

For Radiance, a legal notice said the first public involvement session for the planned community was held Oct. 1, 2026, at Les Bois Junior High School to introduce the sub-area plan.

And in the Peregrine area, BoiseDev reported the proposed casino is still under review by the U.S. Department of the Interior and would also need approval from Gov. Brad Little.

My take

If you're moving this year, this story is more about direction than immediate inventory. Some of these homes are years away from being a realistic option, and some areas will need a lot more infrastructure before they feel like complete communities.

If you're thinking longer term, I'd keep a close eye on a few things:

which projects are already recording plats or starting phases
how access roads are handled, especially where Ada and Elmore County interests overlap
school boundary details before you buy anywhere near the Radiance area
how much nearby commercial and employment space gets built alongside housing

East-of-Boise growth will appeal to some buyers because it opens up a part of the valley that hasn't been built out at the same scale. The tradeoff is that early phases of big master-planned areas often mean living with construction, evolving services, and commute patterns that may look different in five years than they do today.

Sources

Originally reported by BoiseDev.

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