Boulder, CO Housing Market Forecast — September 2026
Typical home value $712,024 as of August 2026 · Stabilizing
Blue: typical Boulder home value (Zillow ZHVI, smoothed and seasonally adjusted), last 10 years. Amber dash: forecast path through September 2027; dotted lines mark the 80% confidence range, which widens with the horizon.
Why the model sees it this way
Sialim's model forecasts the typical Boulder home value will rise 0.3% in September 2026, from $712,024 to about $714,498. The 80% confidence range runs from $713,630 to $715,599.
Prices have been close to flat over the past three months (+0.01% per month on average), and the market is down 0.8% from a year ago.
The 30-year mortgage rate sits near 6.7% (restrictive for affordability); for-sale inventory is down 17% year over year, which supports prices; national unemployment is 4.1%. For this metro the price-only model outperformed the macro-augmented one in backtesting, so the forecast leans on the price trend itself.
Over the most recent six-month test window, this model's predictions for Boulder were off by 0.3% on average. Smaller is better; anything under 1% is strong for monthly home values.
How this compares with Zillow's forecast
| Horizon | Sialim | Zillow's forecast |
|---|---|---|
| Next month | +0.35% | +0.40% |
| Three months | +0.14% | +0.70% |
| Twelve months | -0.70% | +0.20% |
The two forecasts disagree on Boulder's twelve-month direction. Sialim projects -0.70%; Zillow's published forecast shows +0.20%. Disagreements like this get graded here as actuals arrive. Zillow forecast © Zillow, shown for comparison; horizons are aligned to the nearest published month. Agreement or disagreement between the two models is a useful signal either way.
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Frequently asked questions
What is the Boulder home value forecast for September 2026?
$714,498, a +0.35% change from the latest value of $712,024. The 80% confidence range is $713,630 to $715,599.
Is the Boulder housing market cooling or heating up?
Sialim classifies Boulder as "Stabilizing". Monthly price changes have flattened out near zero.
What is the Boulder home price forecast for 2027?
Sialim's model projects $707,016 by September 2027, a -0.70% change from today's $712,024. The 80% range is $692,160 to $729,908; year-ahead forecasts carry much wider uncertainty than next-month calls.
How accurate is this forecast?
Over the most recent six-month test window, this model's Boulder predictions were off by 0.3% on average.
Model details
Forecasts come from Sialim's proprietary forecasting engine, which runs several competing model specifications for every metro, backtests them against what actually happened, and publishes the winner for each horizon. Trained on 320 monthly observations (2000-01-31 to 2026-08-31). This metro's market heat index reads 50, with 0.3% of listings showing a price cut. See the methodology for how forecasts are built, and the ZHVI guide for what the underlying index measures.
Forecasts are model output, not advice. Data: Zillow ZHVI (© Zillow), Freddie Mac via FRED, US Bureau of Labor Statistics via FRED.