City Cast Boise logo

The Treasure Valley’s Population is Booming. Why is School Enrollment Declining?

Posted on June 11, 2024   |   Updated on September 30, 2025
Blake Hunter

Blake Hunter

Closing schools contrast with the Treasure Valley’s booming population. (Alex Grimm / Getty)

Closing schools contrast with the Treasure Valley’s booming population. (Alex Grimm / Getty)

Boise’s growth has been well-documented, but in the past year or so, a seemingly contradictory issue has popped up. School enrollment is declining to the point that some Treasure Valley school districts are closing perfectly operational schools. To figure out why, Idaho Statesman reporter Nick Rosenberger spent months digging up data.

City Cast

Baby Boomers Love Boise. What Does that Mean for Schools?

00:00:00

The ‘Silver Tsunami’

The main cause of declining public school enrollment seems to be a population that’s aging much faster than average, botox be damned.

Between 2000 and 2021 the median age in the U.S. grew by about four years, which shows a gradually aging nation as adults have fewer children later in life. But a city like Eagle is leaps and bounds ahead of the national average. In the same timeframe, Eagle’s median age increased by 11.5 years to almost 47-years-old.

An aging population affects basically all aspects of our society. I wouldn’t say it’s necessarily bad … it strains different parts of society in different ways.Nick Rosenberger, Reporter, Idaho Statesman

The Treasure Valley’s real estate is a perfect affordable landing strip for retired adults leaving more expensive cities. For younger people already living here, their options are to wait it out or leave.

The Enrollment Effect

The Treasure Valley’s largest public school districts have seen declining or stagnant enrollment during the 21st century, with West Ada School District being the largest and seeing its first decline after the COVID-19 pandemic began.

Across the valley, these declines create quite a phenomenon. Since 2020, Ada and Canyon counties have gained new residents and lost public school students at a rate of nearly 14 to one.

Housing costs are a huge factor in the skewing age demographics.

As an example, Rosenberger pointed to the neighboring Vallivue and Nampa School Districts. Nampa school officials have petitioned developers to build on the southern and eastern reaches of the city to shore up recent enrollment declines at Nampa School District. Instead, developers have favored building in the Vallivue School District on the northwestern side of the city.

While the Nampa School District shuts down four elementary schools this summer, on the other side of the district boundary the Vallivue School District is struggling to make enough space for students.

Where Are All the Students Going?

Share article

Hey Boise

Thank you Boise, we’ve loved the conversation we’ve been having with you for the past three years. City Cast Boise and Hey Boise have suspended operations. Our last newsletter and podcast episode was Oct. 24, 2025.

Boise, Explained

See All
Boise, ExplainedOctober 6, 2025

Unemployment Remains Low, But Housing Affordability Stays Out of Reach

All year, much of the U.S. has braced for an economic recession, wary of tariffs, federal layoffs, and general cost-of-living. But when i...

Some Boise job markets are booming — but even in the hottest industries, pay still trails behind housing affordability. (simonkr / Getty)
Boise, ExplainedOctober 3, 2025

How Well Do You Know Idaho's Geological History?

I’m feeling a little bogged down by the news, and sometimes it’s helpful to combat that by looking into the history books.

What are a large swath of Idaho’s mountains made of? (David Radzieta / Getty)
Boise, ExplainedSeptember 19, 2025

Quiz: How Well Do You Know Boise's Parks By Sight?

I kept these largely limited to Boise’s most popular parks, so see if you can place them.

Which park do you think this is? (Blake Hunter / City Cast Boise)
Boise, ExplainedSeptember 11, 2025

What Would It Take? Dreaming of Commuter Rail in the Treasure Valley.

A Compass study found that the Boise Cutoff rail is immensely popular, but it would require an additional track to be laid and bridges to...

Idaho missed out on an opportunity for Amtrak last year — but could a more local option bring rail passengers through the Boise Depot? (Blake Hunter / City Cast Boise)
Boise, ExplainedAugust 22, 2025

How Well Do You Know Boise’s Streets?

Recently, I’ve tested you on weather and climate, on public lands, and the news.

Paths connect us, but can you connect these clues about paths? (Blake Hunter / City Cast Boise)
Boise, ExplainedAugust 21, 2025

Challenges to Idaho's Abortion Bans Are Mostly Finished, and OB-GYNs Are Fleeing. What's Next?

Before this data analysis, Idaho already ranked among the bottom of the barrel for fewest OB-GYNs per capita of any state.

Idaho’s EMTALA case, along with most of the challenges against Idaho’s abortion bans, is over. What’s next? (Idaho Statesman / Getty)
Boise, ExplainedAugust 18, 2025

What the New Anti-Camping Law Means for Boise

Police and housing advocates agree: The state’s punishment for public camping actually hurt the public's ability to help unhoused people.

Police and housing advocates agree: The state’s punishment for public camping actually hamstrung the ability to help unhoused people. (mikexavier / Getty)
Boise, ExplainedAugust 8, 2025

How Well Do You Know Your Meteorology?

To celebrate the benevolent weather and mostly smoke-free air, today’s quiz is all atmosphere!

Precipitation moves in from the ocean, but what’s it called when the mountains catch the moisture and dry the air? (Blake Hunter / City Cast Boise)

The latest in Boise

AnnouncementsOctober 24, 2025

Goodbye from City Cast Boise and Hey Boise

City Cast Boise and Hey Boise have suspended operations.

illustration of skyline with the capitol building, trees, and hot air balloons with "we heart boise"
Boise's BestOctober 21, 2025

Essential Rules for Surviving Boise

In Boise, you need good footwear, a curiosity for breweries, and political resilience. Here are some of the essential rules for surviving...

Cheers to thriving in Boise — or getting closer to it! (Nicolas Micolani / Getty)
Local CivicsOctober 20, 2025

Meet the 2025 Boise City Council Candidates: Jimmy Hallyburton, District 6, Incumbent

Hallyburton faces perhaps the most challenging path to reelection, with former City Council member Lisa Sánchez running to unseat him, an...

Local CivicsOctober 20, 2025

Meet the 2025 Boise City Council Candidates: Lisa E. Sánchez, District 6, Challenger

Sánchez’s return to city hall would be remarkable, as her exit was marked with contention and a lawsuit. But that’s in the past: Her resu...

Local CivicsOctober 20, 2025

Meet the 2025 Boise City Council Candidates: Josh Ellstrom, District 2, Challenger

Ellstrom is a home physical therapist and political newcomer with his eye trained on political neutrality. He’s challenging West Bench in...

Local CivicsOctober 20, 2025

How Boise City Council Candidates Set Themselves Apart

Three council seats are up for election on Nov. 4. Early voting starts today, so here's what Boiseans need to know for the city council e...

Local CivicsOctober 20, 2025

Meet the 2025 Boise City Council Candidates: Colin Nash, District 2, Incumbent

Colin Nash is an incumbent but this is his first time seeking a council seat at the ballot box. In 2023, he was appointed to fill a seat...

Local CivicsOctober 20, 2025

Meet the 2025 Boise City Council Candidates: Jordan Morales, District 4, Incumbent

Morales is unchallenged in his bid for a second term representing District 4 and East Boise. Luckily, he was still kind enough to fill ou...