Shortest distance between Longmont and Castle Rock is 56.46 miles (90.86 km).
Flight distance from Longmont, CO to Castle Rock, CO is 56.46 miles. Estimated flight time is 00 hours 09 minutes.
It takes 00 hours 08 minutes to travel from Longmont to Castle Rock with an airplane (average speed of 550 miles).
The driving distance from Longmont, Colorado to Castle Rock, Colorado is: 79.12 miles (127.33 km) by car.
Driving from Longmont to Castle Rock will take approximately 01 hours 15 minutes.
The most populous city in Boulder County, Colorado. It is located in the northern part of the county. Longmont is known for its many parks and green spaces, its many historical sites, and its many attractions, such as the Longmont Museum and the Longmont Civic Center.
|GPS Coordinates||40°10'2"N 105°6'7"W|
The most populous city in Douglas County, Colorado. It is located on the South Platte River in the Denver metropolitan area. Castle Rock is known for its many parks and green spaces, its many historical sites, and its many attractions, such as the Castle Rock Historical Museum and the Castle Rock Center for the Arts.
|GPS Coordinates||39°22'20"N 104°51'22"W|
The distance between Longmont and Castle Rock is 127 km if you choose to drive by road. You can go 01 hours 24 minutes if you drive your car at an average speed of 90 kilometers / hour. For different choices, please review the avg. speed travel time table on the below.
There is no time difference between Longmont and Castle Rock. The current time is 07:19:27.
|Average Speed||Travel Time|
|30 mph (48.3 km/h)||02 hours 38 minutes|
|40 mph (64.37 km/h)||01 hours 58 minutes|
|50 mph (80.47 km/h)||01 hours 34 minutes|
|60 mph (96.56 km/h)||01 hours 19 minutes|
|70 mph (112.65 km/h)||01 hours 07 minutes|
|75 mph (120.7 km/h)||01 hours 03 minutes|
|80 mph (128.75 km/h)||00 hours 59 minutes|
A car with a fuel efficiency of 8.3 l/100 km will need 10.57 liters (2.79 gallon) of gas to cover the route between Longmont and Castle Rock.
The estimated cost of gas to go from Longmont to Castle Rock is $10.88 (diesel $12.44).
Colorado gas prices.
Take a look at our Gas Cost Calculator feature. It will figure out how much it will cost to drive this particular distance.
The average gas price (in Colorado ) per gallon of daily gas for calculations is $3.897 (Diesel $4.456) /gallon. Last changed prices on September 30, 2023.
The place names are translated into coordinates to approximate the distance between Longmont and Castle Rock (latitude and longitude). Cities, states, and countries each have their own regional center. The Haversine formula is used to measure the radius.