Which Treasure Valley Suburbs Are Growing the Fastest in 2026?

The Treasure Valley's growth story isn't slowing down. According to COMPASS — the Community Planning Association of Southwest Idaho — the combined population of Ada, Canyon, Boise, and Elmore counties reached 915,940 as of April 2026, a figure representing more than 20% growth since the 2020 census. That's 150,000 people added to this region in six years. And while the headline numbers tend to go to Meridian and Boise, the fastest-growing cities on a percentage basis are the ones most buyers don't think of first.

Why does this matter for you as a buyer? Because population growth in a geographically constrained valley is one of the strongest long-term drivers of home value appreciation. People moving into a market where land supply is bounded by foothills and desert — and where every new resident needs somewhere to live — are competing for the same limited inventory. Understanding which cities are absorbing the most growth right now tells you where demand is concentrating, where infrastructure investment is following, and where the appreciation story still has runway. This post gives you the current ranked data and what each city's growth trajectory actually means for people buying there.

The Valley-Wide Picture: 150,000 People in Six Years

The COMPASS April 2026 population estimates paint a striking picture. Ada and Canyon counties alone now hold 876,760 residents — up from 726,072 at the 2020 census. The four-county metro area that includes Boise and Elmore counties has crossed 915,000. COMPASS projects the Treasure Valley will reach approximately 1.1 million people by 2050, which represents continued but moderated growth compared to the peak rate of the early 2020s. For context: if growth had continued at the 7.5% annual rate seen in 2020 to 2022, the valley would double in a decade. It's not on pace to do that, but it's not cooling dramatically either.

The growth is not evenly distributed. Boise, Meridian, and Nampa — the valley's three largest cities — grew at an average of 2.4% from 2025 to 2026. Star and Kuna each grew at roughly 14% over that same period. That divergence tells a real story: the larger established cities are absorbing steady, sustainable growth, while the outer ring communities that still have undeveloped land to build on are growing at a pace that fundamentally reshapes their character year over year. Since the 2020 census, Star has grown 131%. That's not a typo.

Star, Idaho: The Fastest-Growing City in the Valley

Star grew 14.7% in a single year — from 22,370 to 25,660 residents between 2025 and 2026, per COMPASS. Since the 2020 census it has grown 131%, making it the fastest-growing urban center in the entire Treasure Valley on a percentage basis, and the second fastest-growing city in Idaho statewide with an annualized growth rate of 8.01%. That's not a rounding error. It's a city that has fundamentally doubled and then added more in the span of five years.

What's driving it: Star's location sits at the convergence of Ada County's appreciation story and Canyon County's affordability advantage. Most of Star falls within Ada County — which brings Ada County property tax structure, access to the West Ada School District, and the long-term appreciation premium that comes with Ada County positioning — at prices that still run below Eagle's premium tier. The foothills are immediately accessible. The river is nearby. And Highway 16, expected to substantially open by the end of 2026, will meaningfully improve the commute corridor that represents Star's biggest current friction point. Buyers coming in now are buying ahead of that infrastructure improvement.

Kuna, Idaho: The Other 14% Story

Kuna grew 14.3% from 2025 to 2026, adding 4,810 residents to reach 38,560. That's nearly identical to Star's growth rate, with a very different character. Where Star sits on Ada County's western edge with foothills adjacency and an upscale suburban feel, Kuna sits south of Meridian with a more rural, agricultural identity that's being rapidly overlaid by suburban development. Kuna was the 54th fastest-growing city in the entire United States from 2020 to 2024, growing 21% over that period and adding 5,047 people.

The case for Kuna is affordability and trajectory. Entry-level and mid-range homes in Kuna run meaningfully below equivalent product in Meridian or Eagle, and the commute into Meridian's job centers is manageable — roughly 20 minutes under normal conditions. Kuna still has a strong rural feel in places — open land, agricultural surroundings, a smaller-town scale — that's changing fast as development pressure moves south from Meridian. Buyers who value that semi-rural character at a lower price point are moving to Kuna specifically because it still has both; in five years, that window may be narrower.

Caldwell: Biggest Raw Growth Numbers in the Valley

Caldwell added more people in raw numbers than any other city in the valley from 2025 to 2026 — 5,160 new residents, reaching 82,770 total. From 2020 to 2024 it grew 21.5%, ranking it 51st nationally among fastest-growing cities. And it ranked highest in absolute population added over the six-year post-census period, making it arguably the biggest growth story in the valley that nobody talks about.

The engine is affordability. Caldwell sits at the western end of Canyon County with home prices running below Nampa's already-affordable baseline in many segments, making it the most accessible entry point in the broader Treasure Valley. The Indian Creek Plaza redevelopment has fundamentally changed Caldwell's downtown character over the past decade — what was a struggling commercial district is now an active hub hosting 260 events per year with a revitalized streetscape along the creek. The commute to Ada County employment centers remains the primary tradeoff; Caldwell to downtown Boise currently runs about 34 to 37 minutes, and the Caldwell-to-Boise corridor has historically seen the most significant traffic time increases of any route in the valley.

Meridian: Still the Largest Engine

Meridian added 4,730 residents from 2025 to 2026, reaching 152,070 and cementing its position as Idaho's second-largest city behind Boise. Since 2010 it has grown 88.7% — the most transformative sustained growth of any large city in the state. That growth has been accompanied by remarkable amenity buildout: The Village at Meridian, Julius M. Kleiner Memorial Park, Settlers Park, major healthcare campuses, retail concentration along the Eagle Road and Ten Mile corridors, and the continued expansion of the West Ada School District's facilities to serve the incoming population.

Meridian's 3.2% annual growth rate is lower than Star and Kuna's 14% pace, but the raw number — nearly 5,000 people in a single year — reflects the city's sheer scale. At 152,000 residents and growing, Meridian is not a small town discovering growth. It's a mid-size city deepening and diversifying. For buyers, this means the infrastructure largely exists, the amenity layer is mature, and you're not betting on future buildout that may or may not materialize. The tradeoff is that Eagle Road congestion, higher prices than Canyon County, and the density of newer subdivisions means Meridian requires more careful neighborhood-level decision-making than buying in a smaller, simpler community. See the Meridian city guide for a detailed breakdown.

Nampa: Steady and Underrated

Nampa grew 2.9% from 2025 to 2026, reaching 124,426 residents — Idaho's third-largest city. From 2020 to 2024 it grew 16.8%, ranking 91st nationally among fastest-growing cities. Nampa's growth profile is different from the outer-ring percentage leaders: it's steady, diversified, and driven by a combination of affordability, employment access, and the gradual maturation of its suburban infrastructure.

Canyon County's median home price rose from $433,490 to $444,900 between May 2025 and May 2026 — a 2.6% increase — with Nampa being the primary driver of Canyon County's transaction volume. The cash-flow picture for investors in Nampa remains among the strongest in the valley: prices lower than Ada County by roughly $80,000 to $100,000 on comparable product, with rents that are competitive relative to purchase cost. I bought my first Idaho home in Nampa, converted it to a rental when I moved to Star, and the Canyon County cash flow picture has been exactly what I expected. For buyers who want to build equity before moving up into Ada County, Nampa remains the most proven first landing spot in the valley. See the Nampa to Star strategy post for the full logic on this approach.

Middleton: The Valley's Best-Kept Secret

Middleton doesn't show up prominently in statewide growth rankings because it's relatively small, but within the Treasure Valley it has been one of the most consistent performers. It sits along the Boise River between Star and Caldwell, offering river access, a quieter pace, and Canyon County's price advantage while remaining within reasonable commuting range of Ada County employment. Communities like Riverwalk Ranch have been built specifically to offer Greenbelt-adjacent lifestyle at a Canyon County price point.

Middleton's character is genuinely different from the planned subdivision suburban experience that defines most of Meridian and parts of Nampa — it retains more of a small-town, agriculture-adjacent feel alongside its newer development. For buyers who specifically want that slower, quieter version of Idaho life without going fully rural, Middleton consistently delivers it. The Middleton city guide goes deeper on neighborhoods and what to know before you buy there.

Eagle: Premium Growth, Premium Price

Eagle's growth pace — steady rather than explosive — reflects its geographic constraints and its market positioning. At roughly 32,855 residents, Eagle has grown 75.2% since 2010 but has less room to absorb rapid growth than Star or Kuna because it's more developed and its available land is more expensive and more regulated. The result is a market that appreciates consistently rather than explosively, with a premium price point that reflects its established character: river access, the Boise River Greenbelt, a revitalized downtown, and proximity to the foothills without being as far west as Star.

For buyers, Eagle's slower growth actually signals something positive: lower risk of the rapid infrastructure strain that comes with a city growing 14% in a year. The roads, parks, and commercial amenities in Eagle are built out at a scale that matches the existing population. The tradeoff is price — Eagle's median runs well above Meridian and dramatically above Canyon County — and the appreciation story, while solid, doesn't carry the same infrastructure-catalyst upside as Star's Highway 16 play or Kuna's affordability runway. Eagle is the right choice for buyers who want established quality today. See the Eagle city guide for full detail.

What Growth Actually Means for Buyers

Growth data is interesting, but the more important question is: what does it actually tell you about buying in a specific city? Here's how I think about it.

High percentage growth (Star, Kuna) means buying potential at the cost of current friction. A city growing 14% per year is absorbing enormous change. Roads are being built, schools are being expanded, commercial amenities are coming — but they're coming, not here yet. You're buying into what the city is becoming, not what it currently is. For buyers who are patient and financially positioned to hold, this profile often produces the strongest appreciation outcomes. For buyers who need fully built-out infrastructure and amenity access on day one, it can be frustrating.

High absolute growth (Caldwell, Meridian) means buying into proven demand. These cities are attracting large numbers of people because they deliver a product that works for a lot of buyers. The infrastructure investment is real and ongoing. The risk is that you're buying into a more mature part of the cycle, which typically means less dramatic appreciation upside but also less volatility. These cities are strong for buyers prioritizing certainty over maximum upside.

Steady established growth (Eagle, Boise) means buying the finished product. These cities are largely built out, their character is established, and their prices reflect it. Appreciation tends to be consistent rather than dramatic. The buyer profile is someone optimizing for quality of daily life and long-term stability rather than maximum equity growth.

Frequently Asked Questions

Which Treasure Valley suburb is growing the fastest?

Star, Idaho is currently the fastest-growing city in the Treasure Valley on a percentage basis, growing 14.7% in a single year (2025 to 2026) to reach 25,660 residents, per COMPASS. Since the 2020 census, Star has grown 131% — the highest rate of any urban center in the valley. Kuna is a close second at 14.3% annual growth. In terms of raw population added, Caldwell added the most people in a single year with 5,160 new residents.

How fast is the Treasure Valley growing overall?

The combined population of Ada, Canyon, Boise, and Elmore counties reached 915,940 as of April 2026, per COMPASS — up from approximately 726,000 at the 2020 census. That represents more than 20% growth, or roughly 150,000 people added in six years. COMPASS projects the Treasure Valley will reach approximately 1.1 million residents by 2050, representing continued but moderated growth compared to the peak annual rates of the early 2020s.

Is Star Idaho growing too fast?

Growth at 14.7% per year brings both opportunity and friction. Star's roads, particularly Highway 44 during rush hour, reflect infrastructure that hasn't fully caught up to the pace of new residents. Highway 16's extension — expected substantially complete by late 2026 — is specifically designed to address the most significant traffic bottleneck. Schools and commercial amenities are also building out behind the residential growth curve. For buyers, the question is whether you're comfortable with current friction in exchange for buying at a point in the growth curve where the infrastructure improvement still represents upside in the price.

Is Meridian still growing?

Yes — Meridian added 4,730 people in 2025 to 2026, growing 3.2% to reach 152,070. It's now Idaho's second-largest city and has grown 88.7% since 2010. While its growth rate is slower than the outer-ring cities in percentage terms, the absolute numbers remain among the largest in the state, and the infrastructure buildout continuing across the city reflects sustained strong demand for the Meridian lifestyle: top-rated West Ada schools, new construction variety, and a central valley location.

Which Treasure Valley city is best for real estate investment?

It depends on your investment objectives. For appreciation upside, Star and Kuna offer the strongest case in 2026 — both growing at 14%+ annually with specific infrastructure catalysts (Highway 16 for Star, Meta and Micron proximity for Kuna) ahead of them. For cash flow and rental yield, Canyon County cities including Nampa and Caldwell offer the most favorable rent-to-price ratios given their lower entry costs. For long-term stability with consistent appreciation, Meridian and Eagle's established markets provide more predictable outcomes. The right choice depends on your timeline, risk tolerance, and whether you're optimizing for cash flow today or equity in five to ten years.

Why is Kuna Idaho growing so fast?

Kuna's 14.3% annual growth reflects the combination of remaining affordability relative to Meridian and Ada County, proximity to Meridian's job centers (roughly 20 minutes under normal conditions), and an ongoing influx of buyers priced out of Ada County's higher-cost communities. It ranked 54th nationally for population growth from 2020 to 2024, growing 21% over that period. Meta's data center construction in Kuna is also drawing economic activity to the area. The city's transformation from a quiet farm town to a fast-growing suburb mirrors what Meridian experienced a generation earlier, which is part of what makes it a compelling comparison for investors with a five-to-ten-year horizon.

Is it still a good time to buy in the Treasure Valley given all this growth?

COMPASS projects the Treasure Valley will continue growing to 1.1 million residents by 2050, meaning the fundamental demand driver — people moving into a geographically constrained valley — is expected to persist for decades. Ada County's months of supply sits at just 2.4 as of May 2026, well below the 4 to 6 months that defines a balanced market, and sales volume is up 20% year-over-year in Ada County. The families who bought in Boise in 2015 are sitting on equity that felt impossible at the time. The window to buy ahead of the next wave — the Micron expansion, the data center build-out, the Highway 16 opening — is open now. It won't stay open indefinitely.

Curtis Chism

Licensed Idaho Real Estate Agent • eXp Realty • License #SP56593

I relocated from San Diego to Idaho four years ago, own property in both Nampa and Star, and work this market daily. I help buyers understand not just where growth is happening but where it creates the right opportunity for their specific situation. Learn more at weknowtreasurevalley.com/about.