The national numbers tell one story. The market inside them tells several others. U.S. self-storage street rates fell 2.2% year-over-year in March 2026, with the national average landing at $131 per month, according to RentCafe. Yardi Matrix's April market outlook put the annualized average advertised rate at $16.07 per square foot, down 2.0% year-over-year, with negative rate movement registered across all 30 top metros in its tracking set. Read the headline figure and the sector looks uniformly soft.
Charleston, South Carolina, posted 2.6% rent growth year-over-year through early 2026. Nashville, Tennessee, grew 0.8%. Charlotte and Raleigh are tightening as new supply contracts against continued population absorption. These markets are not statistical anomalies. They are the early evidence of a sorting process that has been building since the 2022 rate cycle turned, and that process is now producing clear winners and clear losers in the same national market.
The divergence is not about urban versus suburban. It is not about gateway cities versus secondary cities as sweeping categories. It is about supply per capita, absorption velocity, and which markets managed their development pipelines with enough discipline to let demand catch up. That is the lens that explains 2026 self-storage performance. The geography-type framing, still common in capital allocation conversations, is explaining less and less of what is actually happening.
Which Markets Are Actually Growing Rents in 2026?
Multi-Housing News ranked Charleston among the strongest emerging self-storage markets in its 2026 analysis. Its 2.6% rent growth year-over-year ran more than eight times the national comparison point and reflected a metro where in-migration, measured development, and real demand anchors have kept the supply-demand balance closer to neutral than most markets in the country. Charleston's per-capita supply of 12.8 net rentable square feet per person sits above the national average of 7.8, but its pipeline has remained selective enough that absorption is keeping pace with additions.
Nashville moved up three spots to fifth place on the same emerging markets ranking. The metro's annualized average rent per square foot came to $15.32, reflecting year-over-year growth at a time when most tracked metros are declining. Nashville's roughly 19 million net rentable square feet of total inventory translates to 9.9 square feet per capita. That figure is above the national average, but the metro has real employment anchors, continued multifamily absorption, and a development pipeline that has not yet overwhelmed demand.
The North Carolina markets round out the clearest outperformance picture. Marcus & Millichap's 2026 North Carolina investment outlook projects Charlotte, Raleigh, and Greensboro will collectively add more than 75,000 residents in 2026. New supply is pulling back in Raleigh specifically. Population in-migration against a tightening supply pipeline is the most direct forward indicator of rate stabilization available, and those markets have it.
Why the Sun Belt Suburban Story Is More Complicated
The assumption that secondary markets and Sun Belt suburbs are uniformly outperforming urban cores overstates the case. Several of the fastest-growing suburban markets of the 2018-2022 period are now carrying oversupply as acute as anything in a gateway urban core.
Houston has 888,844 square feet of new storage space scheduled for delivery in 2026, a 3% increase on already substantial inventory, according to Multi-Housing News. The metro is suburban in structure, but supply growth is still outrunning absorption. Atlanta's sprawling suburban footprint has not protected it from rate pressure: oversupply continued to weigh on rents through early 2026, though construction activity is finally slowing toward its lowest pace since 2017, per Marcus & Millichap. Orlando sits in a similar position. Its population growth has been real, but its development pipeline ran aggressive through 2024 and 2025, and rates are still declining as a result.
Migration patterns have also shifted in ways that matter. Flows to Florida, Texas, Georgia, and Arizona, the four Sun Belt states that powered the suburban storage demand surge during the 2020-2022 relocation cycle, have registered steep declines from their peaks. The demand tailwind has moderated. Facilities built to capture a migration wave that was always going to normalize are now competing for a marginal demand increment smaller than their underwriting assumed. The suburban label did not protect those facilities from that math.
The Per-Capita Supply Lens Tells the Clearest Story
Boise, Idaho, moved up one spot to sixth on the Multi-Housing News emerging markets list for 2026. It is a legitimate secondary market with real in-migration credentials. But its fundamentals illustrate exactly the tension that defines secondary markets that became over-discovered during the pandemic years. Boise offers 16.0 net rentable square feet of storage per resident, more than double the national average of 7.8. Its annualized average rent of $13.52 per square foot is the most affordable among all markets on the emerging list. Both numbers describe the same condition: supply ran ahead of demand, even in a genuinely growth-oriented secondary market, and pricing reflects it.
The national average of 7.8 square feet per capita functions as the industry's rough benchmark for equilibrium. Markets operating below that figure, or at it with minimal pipeline ahead, are where pricing power exists today. Markets above it, regardless of whether they sit in an urban core or a suburban ring or a secondary metro, are working through absorption cycles that keep operators on the defensive.
Yardi Matrix's April 2026 market outlook framed the recovery outlook directly: the industry's return to health will be "gradual and uneven in 2026, favoring markets with low supply and improving housing conditions." That is a supply-first framing, not a geography-type framing. It is also the most accurate description of what the data shows.
What This Means for Site Selection and Acquisitions
Development siting decisions made in 2023-2025 are delivering into a market that has clarified what it wants: supply-per-capita discipline and real demand anchors that do not depend on continued migration acceleration. For operators evaluating new construction or acquisitions in 2026 and 2027, several variables have risen in the selection hierarchy.
Net in-migration to the submarket, not the metro, is the demand signal that matters. Suburban markets with net outflow at the submarket level, even inside metros posting positive population growth, are not benefiting from the tailwind that initially justified their development pipelines. Zip-code-level population and household formation data has become standard underwriting input for institutional buyers and should be for regional operators as well.
New supply as a percentage of existing inventory is the risk measure with the strongest predictive track record. Sarasota-Cape Coral's under-construction pipeline represents 8.0% of existing inventory, the highest in Yardi's tracked market set. Miami and Nashville also registered pipeline increases in the April report. Markets where that figure has been stable or declining, like Atlanta with its construction slowdown to the most modest pace since 2017, are the ones that will recover rates first as demand catches up.
The national under-construction pipeline stood at 46.5 million square feet as of April 2026, representing 2.3% of total stock and essentially unmoved since the start of the year. That figure is concentrated in the same markets where oversupply already exists. The pipeline is not building into undersupplied secondary markets at scale. Which means the secondary markets that pass the per-capita screen today are likely to stay competitive for longer than the development pipeline would normally allow.
The Numbers Worth Writing Down
- National average street rate: $131/month, down 2.2% year-over-year (RentCafe, March 2026)
- Yardi Matrix annualized average advertised rate: $16.07/sq ft, down 2.0% year-over-year (April 2026)
- National per-capita supply: 7.8 net rentable square feet per person
- National stabilized facility occupancy: approximately 77.0% (Q4 2025)
- Charleston rent growth: +2.6% year-over-year, 12.8 sq ft per capita
- Nashville rent growth: +0.8% year-over-year, 9.9 sq ft per capita, ranked 5th on emerging markets list (up from 8th)
- Boise per-capita supply: 16.0 sq ft per person, more than double the national average
- Houston 2026 new supply: 888,844 sq ft scheduled for delivery (3% inventory increase)
- Charlotte-Raleigh-Greensboro: 75,000+ new residents projected in 2026 against contracting supply
- National under-construction pipeline: 46.5 million sq ft (2.3% of existing stock), flat since January
The Filter Has Changed. Update Your Screens.
The operators and investors still running primary searches by market type, urban versus suburban, gateway versus secondary, are using a filter that explained 2019 but does not explain 2026. The market has clarified what actually drives self-storage rate performance: supply per capita, pipeline trajectory, and demand anchors that are durable rather than migration-dependent.
Charleston outperformed every Sun Belt suburban market in the country on rent growth in early 2026. Nashville is growing rates while Atlanta is still absorbing excess supply. Boise is affordable partly because it was over-built for its demand base. All three are "secondary markets." None of them look alike from a performance standpoint. The category is not the screen. The supply math is.
Sources
- Top 10 Emerging Self Storage Markets of 2026, Multi-Housing News
- Self Storage National Report – April 2026, Multi-Housing News
- Self Storage Market Outlook – April 2026, Yardi Matrix
- March 2026 self storage report: Rents slide in most U.S. cities, RentCafe
- 2026 U.S. Self-Storage National Investment Outlook, Marcus & Millichap
- National Self-Storage Market Update: Current Performance, 2025 Trends, and H1 2026 Outlook, Matthews Real Estate Investment Services
- Marcus & Millichap Publishes 2026 NC Outlook Report, Modern Storage Media