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Bonneville Joint Grew 78% in 24 Years, Then Stopped

Fri, 27 Feb 2026 12:00:00 GMT

Bonneville Joint District^↗ has 13,511 students. It is Idaho's third-largest district, behind only West Ada and Boise. Twenty-four years ago, it was seventh, with 7,568 students, sitting behind both Idaho Falls^↗ and Pocatello^↗ in eastern Idaho's enrollment hierarchy. It passed Idaho Falls in 2012 and Pocatello in 2018, by a margin of just 31 students.

The 78.5% growth rate over 24 years nearly triples the state's 27.6% gain over the same period. But the streak ended in 2024. Bonneville peaked at 13,801 in 2023 and has declined for three consecutive years, losing 290 students. The question is whether this is a pause or a turning point.

An 18-year run

From 2003 through 2020, Bonneville Joint grew every single year. The 18-year consecutive growth streak is the second-longest among Idaho districts over the period, tied with West Ada and Vallivue and trailing only Jefferson County (19 years).

The growth came in waves. From 2002 to 2010, the district added 2,320 students (+30.7%), fueled by Idaho's pre-recession housing boom and Ammon's emergence as a bedroom community for Idaho Falls. From 2010 to 2020, another 3,437 students arrived (+34.8%), accelerating even through years when the state's growth moderated. The single largest annual gain was 721 students in 2015, a 6.5% jump over the prior year.

The district's share of Idaho's total enrollment climbed steadily: 3.1% in 2002 to 4.3% in 2026. Bonneville Joint grew faster than the state in almost every year of the streak.

The engine: Ammon and INL

Bonneville Joint District covers the communities south and east of Idaho Falls, including Ammon. Census estimates place Ammon's 2024 population at about 20,100, up from 6,187 in 2000. That 225% population increase over 24 years made it one of the fastest-growing small cities in the Mountain West.

The Idaho National Laboratory, located about 50 miles west of Idaho Falls, generates over $4 billion in annual economic impact and is one of the region's largest employers. Federal investment in nuclear research and clean energy has expanded INL's workforce over the past decade, drawing engineers and scientists with school-age children to the Idaho Falls metro area. The Idaho Falls MSA's population reached 171,233 in 2024, growing at 1.6% annually.

Proximity to BYU-Idaho in Rexburg also shapes the district's enrollment indirectly. BYU-Idaho enrolled 24,111 campus students in fall 2024, its largest incoming class ever. Many graduates settle in the Idaho Falls area, and the region's LDS population tends to have above-average family sizes, which sustained school enrollment even as birth rates fell elsewhere.

Eastern Idaho's hierarchy, rewritten

Bonneville Joint's rise reshuffled the region's enrollment rankings. In 2002, Pocatello (12,210) and Idaho Falls (10,648) were eastern Idaho's dominant districts, with Bonneville a clear third at 7,568. By 2026, the order has fully inverted: Bonneville leads at 13,511, Pocatello has dropped to 11,437 (-6.3% since 2002), and Idaho Falls has fallen to 9,751 (-8.4%).

The gap between Bonneville and Idaho Falls is now 3,760 students. In 2011, the year before the crossover, Bonneville trailed by just 14.

Among all Idaho districts currently enrolling more than 5,000 students, Bonneville's 78.5% growth ranks third behind Vallivue (+175.2%) and Kuna (+81.4%). Both of those are Boise-area suburbs that roughly doubled or tripled off smaller bases. Bonneville is the only district east of the Sawtooths in the top five.

Three red bars

The 2024-2026 period introduced something Bonneville had rarely experienced: consecutive decline. The district lost 138 students in 2024, 59 in 2025, and 93 in 2026. The total three-year decline of 290 students (-2.1% from peak) is mild compared to Boise's 4,604-student loss (-17.5% since 2002), but the pattern is new.

The most likely driver is the same force hitting districts statewide: fewer kindergarteners. Bonneville's kindergarten class peaked at 996 in 2013 and has not recovered. In 2026, the district enrolled 824 kindergarteners, a 17.3% decline from that peak.

Eastern Idaho's birth rate decline is steeper than the rest of the state. Idaho's overall birth rate fell 29% between 2007 and 2021, but eastern Idaho's dropped 31%, the largest regional decline. The children born during the 2007 peak are now in high school. The children born in the subsequent trough are the ones entering kindergarten.

A pipeline that tells two stories

Bonneville's grade-level data reveals a district that is simultaneously growing at the top and shrinking at the bottom. Grade 12 enrollment nearly doubled from 614 in 2002 to 1,161 in 2026, an 89.1% increase. Kindergarten grew only 44.1% over the same span, from 572 to 824.

The gap matters because today's kindergarten class becomes tomorrow's 12th-grade class. If incoming cohorts remain near 824 while graduating classes are 1,161, the district will lose roughly 300 students per cycle just from pipeline compression, even without any outmigration.

The district has been planning for continued growth. In August 2023, voters approved a $34.5 million bond to build a new 700-student elementary school near Iona. The rationale was that existing schools were at or over capacity, with several relying on portable classrooms. Whether a district that is now losing students will fill a new elementary school is an open question. It may simply relieve overcrowding at existing buildings rather than absorb new growth.

A new school for a shrinking pipeline

In August 2023, Bonneville voters approved a $34.5 million bond to build a 700-student elementary school near Iona. The rationale was that existing schools were at or over capacity, with several relying on portable classrooms. The bond passed during the district's peak year. Three consecutive declines later, the school is under construction for a district that is losing students.

It may simply relieve overcrowding at existing buildings rather than absorb new growth. The 824 kindergarteners entering in 2025-26 is the district's smallest class since 2008. INL's expansion and Ammon's housing pipeline provide structural support that Boise and Pocatello lack. But 78.5% growth over 24 years was built on a birth rate that has fallen 31% in eastern Idaho. The new elementary school will open into that arithmetic.

Detailed code that reproduces the analysis and figures in this article is available exclusively to EdTribune subscribers.

35 Districts at Record Highs, 38 at Record Lows

Fri, 23 Jan 2026 12:00:00 GMT

Vallivue School District^↗ enrolled 10,700 students this fall, an all-time high. Twenty miles east, Boise Independent District^↗ enrolled 21,717, an all-time low. The two districts sit in the same metro area, draw from the same labor market, and compete for the same families. One has grown 175.2% since 2002. The other has lost 4,604 students, 17.5% of its peak enrollment, and has not grown in nine years.

This is the Idaho enrollment story in miniature. Statewide, 35 districts hit record-high enrollment in 2025-26 while 38 hit record lows. The numbers are almost balanced. The weight is not: the 38 districts at all-time lows collectively serve 86,114 students, 27.4% of the state's enrollment. The 35 at all-time highs serve just 33,738, or 10.7%.

The lopsided split

Idaho added 72,795 students between 2002 and its 2023 peak of 318,979, a 29.6% increase in two decades. That growth has evaporated. The state lost 4,882 students over the past three years, including 3,970 in 2025-26 alone, the largest single-year decline in at least 25 years of data.

Of 190 districts with enrollment in both 2024-25 and 2025-26, 125 declined, 60 grew, and five were flat. The losses are concentrated at the top: West Ada, the state's largest district, lost 538 students. Boise lost 513. Nampa lost 256. Twin Falls lost 250. Eight of the state's 10 largest traditional districts shrank.

The districts at record highs, meanwhile, are small. Their median enrollment is 492 students. Only two, Vallivue and Middleton, exceed 4,000.

Who is growing, and how

Of the 35 districts at all-time highs, 31 are charter schools, virtual academies, or charter-like entities. Four are traditional districts: Vallivue (10,700), Middleton^↗ (4,401), Boundary County^↗ (1,697), and Avery (32).

The charter/choice category includes a range of models. Idaho Arts Charter (1,421), Compas Public Charter (1,289), and North Star Charter (1,143) are brick-and-mortar schools. iSucceed Virtual High School (1,785) and Idaho Virtual High School (833) are fully online. The seven Gem Prep campuses, which collectively enroll 3,240 students across the state, are listed as traditional districts by the state but operate as a charter network.

The demand for alternatives remains unmet. At least 10,711 students sat on charter school waitlists at the start of the 2025-26 school year, and federal funding is supporting the addition of 13 more charter schools and 5,900 seats by 2028.

The biggest districts are the ones shrinking

The concentration of record lows among Idaho's biggest districts is the most consequential pattern in these numbers. Boise^↗, Pocatello^↗ (11,437), and Idaho Falls^↗ (9,751), the state's second, fifth, and seventh largest districts, are all at their lowest enrollment in at least 25 years.

Boise's decline is the longest and deepest. The district peaked at 26,321 students in 2002, the first year in the dataset, meaning its actual peak may have been higher. It has declined in nine consecutive years, losing 4,458 students since 2017, a 17.0% drop. Average daily attendance last year fell to 20,317, the lowest since the 1983-84 school year.

A demographic mismatch Idaho cannot build its way out of

Idaho was the fastest-growing state in the country between 2012 and 2022. But the growth skews old. Between 2020 and 2024, youth contributed only 9.3% of total population growth, the smallest share of any age category, while adults 65 and older accounted for the largest share at 17.4% growth.

The mechanism is straightforward. Many of Idaho's new residents are retirees fleeing higher-cost states, drawn by lower taxes and housing that, while expensive by Idaho standards, remains cheaper than coastal markets. Labor economist Sam Wolkenhauer put it starkly: "In Idaho, there are 68% as many infants as there are 18 year olds." Each graduating class is larger than the kindergarten cohort replacing it. In 2026, Idaho enrolled 25,316 twelfth graders and 20,184 kindergartners, a gap of 5,132 students that has widened every year since 2018.

Housing costs compound the problem inside the Boise metro. Rising prices in Ada County have been pricing young families into Canyon County suburbs like Vallivue and Middleton, or out of the metro entirely. Nampa, once a more affordable alternative, has itself begun losing students, shedding 256 this year and repurposing four elementary schools for other uses.

Rural districts on a longer clock

Twenty-nine of the 38 districts at all-time lows have full 25-year histories in the data, making their declines not statistical artifacts of short timelines but confirmed long-term trends. These 29 districts have lost an average of 26.7% from their peak enrollment.

Salmon District^↗, in the Lemhi Valley, enrolled 1,143 students in 2002 and 609 in 2026, a 46.7% decline over 24 years. Caldwell^↗ peaked at 6,428 in 2008 and has since lost 1,496 students, 23.3% of its enrollment. Soda Springs, Marsh Valley, Payette, St. Maries: the list of small and mid-size districts that have never been smaller runs the length of Idaho's rural geography.

These districts face a structural challenge distinct from Boise's housing-driven losses. Idaho's population grew 45% between 2002 and 2022, but births increased only 7% over the same period. The birth rate fell from 16.6 per 1,000 in 2007 to 11.8 in 2021, a 29% decline. For rural districts already operating on thin margins, Idaho's ranking of 49th or 50th nationally in per-pupil funding since 2020 leaves little room to absorb the losses.

In the past six months alone, at least seven Idaho school districts have announced or considered school closures, including Caldwell, Coeur d'Alene, Boise, and Marsh Valley, four of which appear on the all-time-low list.

The acceleration underneath

The near-symmetry of 35 record highs and 38 record lows obscures an acceleration. In 2023, 15 districts hit record highs and six hit record lows. In 2025, those numbers were 23 and 14. In 2026: 35 and 38. The split is widening in both directions simultaneously.

Seven districts have announced or considered school closures in the past six months alone. Nampa shuttered four buildings. Caldwell, Coeur d'Alene, Boise, and Marsh Valley are all weighing cuts. On the other side, Vallivue's two new elementary schools opened in August, and Gem Prep broke ground on an eighth campus in Idaho Falls.

The 121 districts in the middle, 61.9% of statewide enrollment, are the pool from which future records will be drawn. Most of them lost students this year. The new residents keep coming. Their children, increasingly, do not.

Detailed code that reproduces the analysis and figures in this article is available exclusively to EdTribune subscribers.