TL;DR: A published months-of-supply number for Northwest Arkansas is reliable only after you check six things: sample size, the closed-sales window in the denominator, the raw counts behind the ratio, seasonal timing, MLS coverage area and methodology, and trend history. Benton County's published figure was 7 months of supply in February 2026; recalculating from March 2026's own published counts, 3,305 active listings divided by 589 closed sales, yields 5.6 months, same MLS source, different month's data, showing how much a headline ratio can move between two months.
How Reliable Is a Months-of-Supply Number for Northwest Arkansas?
Northwest Arkansas' most commonly cited months-of-supply figures come from the Northwest Arkansas Board of Realtors MLS, branded ArkansasONE MLS, and compiled monthly by NWALook.com. In February 2026, that pull showed Benton County at 7 months of supply and Washington County at 6 months. But months of supply is only a ratio, active listings divided by a sales pace, and the sales-pace denominator is where headline figures diverge. Recalculating from March 2026's own published numbers, Benton County's 3,305 active listings divided by its 589 closed sales that month works out to 5.6 months (3,305 / 589 = 5.6). Washington County's 1,626 active listings against 351 closed sales comes out to 4.6 months (1,626 / 351 = 4.6). Same MLS, one month apart, and the implied ratio moved by more than a full month in each county. Before you act on any published months-of-supply figure, ask the source exactly which closed-sales window sits in the denominator, a single month's closings or a trailing average. If you can't get that answer, treat the number as a snapshot, not a trend.
Does the Sample Size Behind the Ratio Matter?
A ratio built on a few hundred listings moves more than one built on thousands. In an August 2025 ArkansasONE MLS pull, Bentonville's 734 active listings produced 5 months of supply and Fayetteville's 652 listings also showed 5 months, both large enough samples to hold steady. Smaller markets told a different story: Centerton, with 307 active listings, showed 11 months of supply, and Lowell, with 184 listings, showed 9 months, while Rogers, with 488 listings, showed only 4 months. The same pattern shows up in annual sales counts: in the 2026 top-15 city ranking, Fayetteville had 630 closed sales and Bentonville had 600, while Gentry had only 86. A handful of closings in Gentry, or a handful of new listings hitting Centerton, can flip a ratio by months rather than weeks. If you're watching a submarket with a few hundred active listings or fewer, or annual sales near Gentry's 86, ask for the raw counts behind the ratio, not just the headline number. A source that won't disclose them disqualifies its own figure for timing a decision.
Does the Number Account for Seasonal and Month-to-Month Swings?
Months-of-supply figures are snapshots, and NWA's own month-to-month swings show how far a snapshot can move. Between February and March 2026, Benton County's active listings jumped 27.9%, from 2,583 to 3,305, and Washington County's rose 16.8%, from 1,392 to 1,626, inventory building the way it typically does heading into spring listing season. A months-of-supply figure pulled during that kind of swing reflects where listings and sales happened to land that particular month, not necessarily the balance a buyer or seller will face three months later. Ask any source two questions: is this a single month's snapshot, and does it note which direction inventory moved the month before? A figure presented without that context is easy to misread as a structural shift when it may just be seasonal timing. If you're deciding whether to list this fall or wait for spring, don't lean on one month's ratio. Ask for at least two or three consecutive months so you can see whether the number is trending or simply bouncing.
Does the Source's Coverage Area and Methodology Match the Decision You're Making?
Not every NWA inventory statistic is built the same way, and mixing them produces false comparisons. ArkansasONE MLS months-of-supply figures measure active listings against a sales pace. The Center for Business and Economic Research's Skyline Report tracks something different: an absorption rate defined as a raw count of homes sold, not a ratio. NWA's absorption rate hit a 20-year high of 2,497 homes in the first half of 2024. The Skyline Report separately tracks a lot-based supply metric, remaining lots in active subdivisions, which stood at 17.6 months of supply at the end of the second half of 2020. Citing a lot-supply figure or an absorption count as if it were a home months-of-supply ratio is a common way these numbers get misused. Coverage area matters too: Benton County's active single-family listings climbed from 2,028 in July 2022 to 3,329 in July 2026, a rise of more than 64%, tracked across roughly 39,000 listings. That trend is visible only because someone tracked the same geography and definition for four straight years, something a single month's snapshot can't show.
What Should You Do Before You Act on a Months-of-Supply Number?
Run any published figure through this checklist before you let it drive a decision:
- Ask for the raw active-listing and closed-sales counts behind any ratio, not just the headline figure. Treat anything near Centerton's 307 listings or Lowell's 184 as high-variance.
- Confirm whether the denominator is a single month's closed sales or a trailing average, and recalculate it yourself when possible, the way Benton County's 3,305 active listings and 589 closed sales works out to 5.6 months rather than the headline 7.
- Request at least two to three consecutive months of the same figure so you can see a trend rather than one snapshot, especially around the spring inventory build reflected in Benton County's 27.9% and Washington County's 16.8% month-over-month jumps.
- Verify which report you're reading, an ArkansasONE MLS months-of-supply ratio, a CBER Skyline Report absorption count, or a Skyline lot-supply figure, before comparing it to any other number.
- Call Mason Capital Group at 479-925-3333 for a current read on your specific submarket before you set a list price, make an offer contingent on inventory conditions, or hold a property waiting for the market to shift.
Frequently Asked Questions
What Is Months of Supply and How Is It Calculated?
Months of supply is the number of active listings divided by the current sales pace, showing how long it would take to sell all inventory at that pace. Benton County's March 2026 figures recalculate to 5.6 months: 3,305 active listings divided by 589 closed sales. The result changes with either input, which is why the raw counts behind a published ratio matter more than the single number itself.
Why Did Benton County's Months of Supply Look Different Depending on the Month?
Benton County showed 7 months of supply in February 2026 but recalculates to 5.6 months using March 2026's own published active listings, 3,305, and closed sales, 589. The gap comes from which month's closed-sales figure sits in the denominator, not necessarily a change in the underlying market. Always ask which sales window a published ratio uses before comparing figures across months.
Is a Skyline Report Absorption Rate the Same as MLS Months of Supply?
No, they measure different things. The CBER Skyline Report's absorption rate is a raw count of homes sold in a period, 2,497 in the first half of 2024, while MLS months of supply is a ratio of active listings to sales pace. Comparing the two directly produces a false read on market conditions.
How Small Is Too Small a Sample for a Reliable Months-of-Supply Figure?
There's no fixed cutoff, but smaller NWA submarkets show far more volatile ratios than larger ones. Centerton's 11 months of supply came from just 307 active listings, and Lowell's 9 months came from 184, compared to Rogers' 4 months on 488 listings. Ask for the underlying counts on any submarket figure before treating it as stable.
If you're weighing a listing, an offer, or a hold decision anywhere in Benton or Washington County, call Mason Capital Group at 479-925-3333 and we'll pull the current active-listing and closed-sales counts behind your specific submarket's months-of-supply figure, not just the headline ratio, before you commit to a number.
About the author: Cameron Torabi, Principal Broker — Mason Capital Group. 30+ years of Northwest Arkansas real estate expertise; $2.4B+ in cumulative transaction activity.
Figures in this article are drawn from NWALook.com's NWA's Monthly Real Estate Market Update for February 2026 and March 2026, NWALook.com's NWA's Housing Inventory Surges in 2025 (August 2025) and Northwest Arkansas Top 15 Cities by Sales Activity 2026 YTD (June 2026), NWALook.com's Benton County Housing Inventory Has Climbed 64% Since 2022 (July 2026), and Talk Business & Politics coverage of the CBER Skyline Report (September 2024 and August 2026), all based on ArkansasONE MLS and CBER/Walton College research.