List Your Brentwood Home This Fall, or Wait for Spring?

Someone decides to sell in September. Then they hear that spring is the only real selling season, and a move they were ready for gets shelved for six months on a rule of thumb that was never written about Brentwood.

The numbers below say where the seasonal tilt is real, and where it stops applying to us.

What does the national data say about listing in the fall?

Spring wins, by less than most sellers think.

ATTOM looked at more than 52 million single-family home and condo sales from 2015 through 2025 and compared each sale price against the automated valuation for that same home at the time of sale. The gap between the two is what they call the seller premium.

The pattern is consistent. March led at 10.7%, with April and May tied at 10.2%. Premiums narrow through the back half of the year and bottom out at 8.0% in September and 7.9% in October. They start building again in January at 9.6% and February at 10.0%.

Look at the spread, though. About 2.8 percentage points separate the best month from the worst. That is real money, and still a fraction of what an overpriced April listing gives back while it chases the market down all summer. Timing is a smaller lever than most sellers think. Pricing is a much bigger one.

Contra Costa is still moving fast

For that I go to the county numbers, and right now they describe a market that is sideways on price and quick on everything else.

In the California Association of Realtors' July 2026 report, the median price for an existing single-family home in Contra Costa County was $875,000. That is down 4.9% from June's $920,000 and up 1.4% from $862,500 in July 2025. A downward wobble, not a slide.

The two numbers I watch harder than price are speed and supply. Homes sold in a median of 15 days in July 2026, against 18 days in July 2025. The county's unsold inventory index sat at 2.6 months, down from 3.1 a year earlier. Statewide, homes closed at 99.3% of list price, up from 98.5% the year before.

Contra Costa County, July 2026

Homes went pending in a median of 15 days, three days faster than a year earlier.

Unsold inventory sat at 2.6 months. Statewide, sellers closed at 99.3% of asking. Source: C.A.R. July 2026 home sales report.

15 days

median time on market

Translated: less than three months of supply on the shelf, homes selling faster than a year ago, and the typical seller landing within a hair of asking. That is not a market where a good listing languishes because it is autumn.

Rates are the other half of the picture. Freddie Mac's Primary Mortgage Market Survey put the 30-year fixed at 6.71% the week of September 3, 2026, up slightly from 6.66% the week before. Rates have been boring for months, which is the best thing rates can be.

A Brentwood fall listing behaves differently

Because we are a farm town, and September and October look nothing here like they do in a subdivision outside Dallas.

If your home sits within 2,000 feet of agricultural land, you are required to deliver the Right to Farm disclosure under Brentwood Municipal Code section 8.01.060, at least five days before title transfers. That is true in every season. What changes in the fall is that your buyer is not reading about tractors on a form. They are hearing them at 5:30 in the morning during the second showing. I wrote about what that disclosure means earlier this summer.

Most agents treat harvest as a liability. I don't. A buyer who tours a home in mid-October, smells the dust, hears the equipment, and writes anyway has already made peace with living next to a working farm. The buyer who falls in love in February and discovers all of it in June is the one who gets cold feet during the disclosure period and walks. Fall in Brentwood filters your buyer pool early, and the offers that survive the filter tend to hold together.

The tradeoff is daylight. By late October you have lost the 6:30 p.m. showing window. Get photography done in the first week, and make sure the interior lighting is doing real work, every lamp on and every bulb matched, before the first showing.

Fall closings run into the holidays

Does the calendar change if you're moving to a 55+ community?

Yes, and this is where the national seasonality data becomes close to irrelevant.

If you are selling to move into Trilogy at the Vineyards or another 55+ community, your listing date is not governed by buyer traffic. It is governed by what is available in the community you are moving to, and by Proposition 19.

Under Prop 19, homeowners 55 and older can transfer their property tax base to a replacement home anywhere in California, up to three times, as long as the replacement is purchased within two years of the sale. Two years sounds generous until you are the one counting. I would rather list in October with a house I want in sight than list in March because a headline said so and then spend two years scrambling. The sequencing is in Don't Overpay Property Taxes When You Downsize.

Demand in a 55+ community also is not tied to the school calendar the way it is elsewhere in Brentwood. People tour Trilogy in October because a retirement date landed, or a two-story house stopped making sense, or the right floor plan finally came up for resale. Waiting for April buys you nothing on that side of the move.

Three things matter more than the month

Price. The seasonal premium spread is under three points. A pricing mistake costs you more than that in the first ten days. Your opening weekend is the most attention your home will ever get, and you cannot recover it by reducing in week four.

Preparation. The order you do things in matters as much as what you do. The sequence is in How to Prepare Your Brentwood Home to Sell: A 3-Week Checklist.

Knowing your net. Not your sale price. Your net. That is what catches sellers off guard more than anything else, and I broke it down line by line in What Brentwood Sellers Actually Pay at Closing in 2026.

Get those three right in October and you will do better than a seller who gets them wrong in April. The arithmetic says so.

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If you are weighing fall against spring on a Brentwood or Trilogy home, send me the address and the month you have in mind. I'll pull what sold on your street in both seasons and tell you which one the numbers favor for your house, not the national average.

(925) 200-0717 — fifteen minutes on the phone will tell you more about your situation than any statistic in this post.

This post is for general informational purposes only and is not legal or tax advice. Property tax rules, including Proposition 19 base year value transfers, have eligibility requirements and filing deadlines that vary by situation. Confirm your circumstances with the Contra Costa County Assessor and a qualified tax professional or attorney before making a decision based on tax treatment. Market figures are as of the dates listed below and change month to month.

Margie Lupo, Broker Associate, SRES® · eXp Realty of Northern California, Inc. · DRE #01193496 · Brokerage DRE #02188495 · Equal Housing Opportunity

Sources

• ATTOM, "ATTOM Analysis Finds Spring Remains the Prime Window for Home Sellers" (April 30, 2026) — monthly seller premiums, 52 million sales 2015–2025. Accessed September 10, 2026.
• California Association of Realtors, "July 2026 Home Sales and Price Report" — Contra Costa County median price, days on market, unsold inventory index; statewide sale-to-list ratio. Accessed September 10, 2026.
• Freddie Mac, Primary Mortgage Market Survey — 30-year fixed rate for the weeks of September 3 and August 27, 2026. Accessed September 10, 2026.
• Brentwood Municipal Code, Chapter 8.01 — Right to Farm — the 2,000-foot disclosure requirement and five-day deadline. Accessed August 2026.
• California State Board of Equalization, Proposition 19 — base year value transfer for homeowners 55 and older: anywhere in California, up to three transfers, two-year window. Accessed September 10, 2026.