Search for Cotati's median home price this month and you will collect at least three numbers that cannot all be describing the same town. Homes.com puts the median sale price at $695,000 as of July 2026. Zillow's home value index, last refreshed in February, had it at $740,012. Movoto's most recent read, from June 2026, shows a median list price of $889,000. Redfin's trend page for Cotati, when checked this month, still shows August 2025 as its most recent complete reporting window, with a median sold price of $490,000 on just five closed transactions.
Four sources, four numbers, a $399,000 spread, all claiming to describe the same square mile and a half of Sonoma County. That is not a rounding error. It is what happens when a housing market is small enough that a single closing can move the headline.
The math behind the disagreement
Cotati is a small city, just under two square miles, built around a hexagonal town plaza that is one of only two such layouts in the country. Small geography means small transaction counts, and small transaction counts make medians unstable. When Redfin recorded five home sales in Cotati in a single month, one $2 million estate lot or one $350,000 studio condo closing that month would have swung the reported median by tens of thousands of dollars on its own. That is not a flaw in Redfin's math. It is what a median does when the sample behind it is thin.
Compare that to Rohnert Park next door, where Redfin tracked 97 home sales in a single month (May 2026) and Movoto counted 99 in November 2025. With that much volume, one unusual sale barely moves the number. Rohnert Park's reported medians across four different sources this year cluster tightly: $682,000 (PropertyShark, Q1 2026), $700,000 (Redfin, trailing three months through May 2026), $699,950 (Movoto, November 2025), and $713,812 (Zillow, as of July 31, 2026). That is a $58,000 range on a city with a home price around $700,000, a band of roughly 8 percent. Cotati's range, by contrast, is closer to 60 percent of its own midpoint.
| Source and window | Cotati | Rohnert Park |
|---|---|---|
| Redfin sold median | $490,000 (Aug. 2025) | $700,000 (3 mo. through May 2026) |
| Zillow home value index | $740,012 (Feb. 2026) | $713,812 (July 2026) |
| Movoto | $889,000 list (June 2026) | $699,950 sold (Nov. 2025) |
| Homes.com / PropertyShark | $695,000 sold (July 2026) | $682,000 sold (Q1 2026) |
The lesson is not that one of these sources is wrong. It is that a median is only as trustworthy as the number of sales behind it, and in a town the size of Cotati, that number is often too small to hold still.
What a single month of Rohnert Park closings actually looks like
Even Rohnert Park's steadier median hides real range once you look at individual closings. In the four weeks leading up to this post, four homes changed hands in the city, all logged in the Sonoma County public record and reported by the Press Democrat's real estate desk:
- A five-bedroom house on Dexter Circle sold for $950,000, with a new owner recorded since August 28.
- A four-bedroom house on Landsdown Circle sold for $515,000 on September 9, at $383 a square foot.
- A single-family home on Glacier Court sold for $772,000, with a new owner since September 10.
- A three-bedroom, 1,474-square-foot house built in 1969 closed today, September 23, for $575,000.
That is a $435,000 spread across four sales in the same city inside four weeks. Rohnert Park's median absorbs that range because there are enough transactions to average it out. Cotati's median cannot, because there usually aren't enough sales in a given month to average anything.
PropertyShark's first-quarter 2026 data for Rohnert Park adds another layer worth knowing before you compare either city to a countywide number. The combined median across all property types was $682,000, down 10.2 percent year over year. But split by type, single-family houses had a median of $739,000 while condos came in at $354,000, a difference of $385,000 within the same city in the same quarter. Sonoma County's overall median that quarter was $770,000. Rohnert Park sits below the county figure largely because it carries meaningfully more condo inventory than the county as a whole, and that segment fell faster (down 17.9 percent year over year) than single-family homes did (down 5.6 percent).
None of this means Cotati or Rohnert Park is a better or worse place to buy. It means the single number most portals lead with is doing less work than it looks like it's doing.
Two different demand stories, not one shared market
Cotati and Rohnert Park share a border, a school district, and a SMART train line, but the forces pulling on their housing stock are not the same, and that difference shows up in the price data even when the towns look interchangeable on a map.
Cotati's downtown sits about three miles from Sonoma State University, whose fall 2025 enrollment was 5,000 students. The university's own housing office completed a rental market survey in April 2025 and found that average one-bedroom rents within a three-mile radius of campus, a radius that covers both Cotati and Rohnert Park, range from $2,100 to $4,000 a month. That range matters because it means smaller Cotati properties, cottages, townhomes, and condos near the plaza, get priced partly on what they can earn as a rental and partly on what a family would pay to live in them. Those are two different valuation logics competing inside the same small inventory, which adds to the noise in any given month's median.
Rohnert Park's demand story runs through a different local institution: Graton Resort & Casino, on the city's northwest edge. The casino's first major expansion milestone opened on May 4, 2026, adding a 144,000-square-foot non-smoking gaming wing, nearly 2,000 additional slot machines, a new poker room, and three new dining concepts, including a 28,000-square-foot rooftop restaurant led by chef Roy Ellamar and his wife Jennifer Murphy-Ellamar. That single phase alone was tied to more than 430 new jobs, about 160 of them culinary roles. Construction on the broader $1 billion project began in 2023 and continues through 2027, with a 200-room hotel tower and an adults-only pool still to come.
Cathy Slack, CEO of the Rohnert Park Chamber of Commerce, described the expansion's effect on the city plainly when the new wing opened, saying the resort has helped put Rohnert Park "on the map, alongside destinations like the Green Music Center," and that the city is experiencing "strong economic momentum, supported by ongoing investment and long-term planning efforts, including the anticipated development of a downtown district."
That is a different kind of demand pressure than a university rental market. It is jobs, most of them with health benefits, arriving in a specific corner of a specific city, with a downtown district already under discussion. It does not show up as a line item in any portal's median, but it is a more durable explanation for Rohnert Park's steadier price trend than anything the aggregate number tells you on its own.
What to actually check before comparing the two
If you are weighing Cotati against Rohnert Park, the single most useful thing you can do is stop trusting any one site's median in isolation. Ask instead how many sales are behind the number you're looking at, and over what window. A median built on five transactions deserves far less confidence than one built on ninety-seven, even if both are labeled the same way.
Ask what property type is driving the figure. A city's blended median can shift by hundreds of thousands of dollars depending on whether the sales mix that month leaned toward condos or single-family houses, as Rohnert Park's own Q1 2026 split shows.
And ask what is actually pulling buyers toward each city right now. Cotati's smaller, walkable core tied to Sonoma State creates a market where rental economics and owner-occupant demand pull in different directions. Rohnert Park's price stability is sitting on top of a named, dated, ongoing investment: a casino expansion with a construction timeline that runs through 2027 and a downtown district that local officials are already discussing publicly.
A few common questions
Is Cotati cheaper than Rohnert Park? Depending on which source and month you check, Cotati has shown both a lower median (Redfin's $490,000 sold figure) and a higher one (Movoto's $889,000 list figure) than Rohnert Park in the same year. The honest answer is that Cotati's number moves too much month to month to make a confident one-line comparison. Rohnert Park's steadier data puts it in the $682,000 to $740,000 range across four sources in 2026.
Does the Graton expansion mean Rohnert Park prices will keep rising? The expansion is a real, ongoing source of jobs and investment through at least 2027, and it is one input among several that shapes local demand. It is not a guarantee of future price direction, and no one tracking the market honestly claims otherwise.
Why does Cotati have so few recorded home sales in some months? The city is under two square miles with a limited number of single-family parcels. In a market that size, five or six closings can represent a normal month, which is exactly why a single unusual sale can swing the headline median so far.
If you're weighing Cotati against Rohnert Park, or any two North Bay cities that look similar on paper, the Kristie Martinelli Team can walk you through the actual closings behind the headline numbers, not just the number itself, so you know what you're really comparing before you write an offer.
