Boulder to Castle Rock: Road Trip Guide & Distance

How far is Boulder from Castle Rock?

The distance from Boulder to Castle Rock is 49.6 miles (79.8 km) as the crow flies. Castle Rock is located SSE of Boulder. By car, the driving distance is approximately 64.4 miles, taking about 1h 18min. A direct flight would take roughly 36min. Both are located in United States.

This is a quick and easy drive, perfect for a day trip or weekend getaway. You can easily make the round trip in a single day. Heading East means you'll be driving into the sunrise if you start early. Keep your windshield clean for the best visibility. Given the short distance, driving or taking a train is often faster and more convenient than dealing with airport security and flight boarding times.

Coordinates come from public place data for Boulder and Castle Rock. The driving distance is estimated from straight-line distance with a road-factor model, so confirm the route in your navigation app. Fuel, flight, bus, and train values are planning estimates and can change by date, provider, road closures, and border rules.