Revolutionizing · Modernizing · SimplifyingRevolutionizing · Modernizing · SimplifyingCastle Rock and Thornton are both Colorado towns. There are 567 homes for sale in Castle Rock and 357 in Thornton as this page loaded. Castle Rock is the more expensive of the two: a median asking price of $739,000 against $509,900 in Thornton, about 45% higher. Homes are moving faster in Thornton — a median of 54 days on market against 61 in Castle Rock. Castle Rock is a balanced market right now and Thornton is a seller's market.
| Measure | Castle Rock | Thornton |
|---|---|---|
| Homes for sale | 567 | 357 |
| New in last 30 days | 132 | 120 |
| Median asking price | $739,000 | $509,900 |
| Median price per sq ft | $278 | $275 |
| Median size (sq ft) | 2,991 | 1,803 |
| Median bedrooms | 4 | 3 |
| Median days on market | 61 | 54 |
| Months of supply | 3.8 | 2.4 |
| Sold, last 12 months | 1,789 | 1,768 |
| Median sold price | $682,500 | $523,250 |
| Median days to sell | 70 | 60 |
| Sold vs asking price | 99.0% | 100.0% |
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.
Castle Rock is more expensive. The median asking price is $739,000 in Castle Rock against $509,900 in Thornton. By price per square foot, Castle Rock runs $278 and Thornton $275.
Homes for sale in Thornton have been on the market a median of 54 days, against 61 days in Castle Rock. Of the homes that actually closed in the last twelve months, Castle Rock took a median of 70 days and Thornton 60.
Castle Rock is a balanced market and Thornton is a seller's market, measured on months of supply — 3.8 months in Castle Rock and 2.4 in Thornton. More months of supply means more choice and more room to negotiate, so on that measure Castle Rock 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 567 homes for sale in Castle Rock and 357 in Thornton as this page loaded, 132 and 120 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 September 7, 2026 at 5:29 PM Mountain time. The figures themselves are worked out again from scratch every time this page is opened.