Revolutionizing · Modernizing · SimplifyingRevolutionizing · Modernizing · SimplifyingBoulder and Castle Rock are both Colorado towns. There are 623 homes for sale in Boulder and 523 in Castle Rock as this page loaded. Boulder is the more expensive of the two: a median asking price of $985,000 against $745,000 in Castle Rock, about 32% higher. On months of supply both are a balanced market right now.
| Measure | Boulder | Castle Rock |
|---|---|---|
| Homes for sale | 623 | 523 |
| New in last 30 days | 129 | 128 |
| Median asking price | $985,000 | $745,000 |
| Median price per sq ft | $526 | $273 |
| Median size (sq ft) | 1,954 | 3,033 |
| Median bedrooms | 3 | 4 |
| Median days on market | 73 | 73 |
| Months of supply | 5.0 | 3.6 |
| Sold, last 12 months | 1,486 | 1,733 |
| Median sold price | $961,000 | $689,000 |
| Median days to sell | 64 | 69 |
| Sold vs asking price | 98.0% | 99.0% |
The darker figure in each row is the lower price, the shorter wait or the larger number — which of those is the good news depends entirely on whether you are buying or selling.
Boulder is more expensive. The median asking price is $985,000 in Boulder against $745,000 in Castle Rock. By price per square foot, Boulder runs $526 and Castle Rock $273.
Both are sitting at a median of 73 days on market.
Boulder is a balanced market and Castle Rock is a balanced market, measured on months of supply — 5.0 months in Boulder and 3.6 in Castle Rock. More months of supply means more choice and more room to negotiate, so on that measure Boulder is the easier of the two to buy in today. That is the arithmetic, not advice — the right town is the one you want to live in.
There are 623 homes for sale in Boulder and 523 in Castle Rock as this page loaded, 129 and 128 of them new in the last 30 days.
They are not published on a schedule and they are not a monthly snapshot. Both towns are read from the live MLS feed at the same instant, when you open this page, so the two sides are always measured against each other rather than against different weeks.
Both sides of this comparison are recalculated from the live MLS feed at the moment the page loads - neither is a monthly snapshot, and the two are read at the same instant so they are always comparable. Figures cover residential homes for sale; rentals, land and commercial are excluded, as are fractional co-ownership shares, which are priced per share and would distort the medians. Sold figures cover the last twelve complete calendar months. Market data is deemed reliable but not guaranteed - talk to us before making a decision on it.
The listings these figures are drawn from were last changed at the MLS on November 7, 2026 at 1:16 AM Mountain time. The figures themselves are worked out again from scratch every time this page is opened.