Zumper’s rent data provides insights to where the Consumer Price Index (CPI) is heading
Produced monthly by The Bureau of Labor Statistics (BLS), the Consumer Price Index (CPI) is a measure of the average change over time in the prices paid by urban consumers for goods and services, including rent. Since the Cost of Shelter CPI uses existing paid rents, among other data points, as part of its calculation, there is a lagging nature to the CPI’s shelter cost component. Zumper’s data, however, serves as a leading indicator of shelter cost as we measure true market rents.
The June CPI report showed headline inflation over the trailing 12 months easing to 3.5%, down from 4.2% in May and the first decline in the annual rate since January. On a seasonally adjusted basis, the all-items index fell 0.4% in June, its largest one-month decline since April 2020, driven overwhelmingly by a 5.7% drop in energy prices. The shelter index, meanwhile, rose just 0.1% in June — a third of May’s 0.3% pace and a continuation of the steady monthly deceleration that has defined the component since spring. On a year-over-year basis, shelter eased to 3.3%, down slightly from 3.4% in May. With the statistical distortions introduced by the federal government’s appropriations lapse in October 2025 now largely washed out of the data, shelter’s monthly momentum has faded to its slowest pace in over a year.
This is where Zumper’s forward-looking data becomes especially relevant and where June marks a turning point. Our June National Rent Index shows one-bedroom rents up 0.4% year-over-year, the first positive annual reading since May 2025. The measure has now climbed steadily off its floor: annual one-bedroom growth bottomed at -2.2% last November before narrowing to -2.0% in January, -1.7% in February, -1.5% in March, -0.6% in April, and essentially flat at -0.1% in May, before crossing into positive territory in June. National rents are now higher than they were a year ago for the first time in more than a year, and monthly momentum is building into the heart of peak leasing season.
The gap between what shelter CPI is recording and what the market is actually doing continues to cut in two directions. On one side, leases signed during the soft rental environment of late 2024 and early 2025 are still cycling through the BLS’s rotating survey panel, and that mechanical drag should keep pulling on shelter CPI through the back half of the year. On the other, the well of new market softness that fueled that disinflation is starting to run dry.
For the Fed, June’s broad cooling reduces the near-term case for further tightening, and markets have shifted toward a hold at the July meeting. But much of the improvement was energy-led rather than a sign that underlying price pressures have durably shifted. Shelter, the single largest contributor to core CPI, remains the structural swing factor, and the signal from Zumper’s data is that the prolonged stretch of rent softness that handed shelter CPI a disinflationary tailwind may be coming to a close. With market rents turning positive and monthly momentum accelerating through the summer, the pipeline of mechanical shelter disinflation now has diminishing new softness to draw from. Any further pickup in asking rents from here would begin working against the inflation outlook rather than for it, which is why the trajectory of market rents this summer remains one of the single most important domestic variables to watch.
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