The City of Boulder, home to about 100,000 residents, lies in a valley against the foothills of the Rocky Mountains.  The average summer temperature reaches 80 to 90 degrees during the day, but it tends to cool off most nights. It can get as hot as 100 degrees, but the low humidity makes it bearable. If you are coming from a humid climate, you may need to drink lots of water as you get used to the arid climate.
Boulder’s elevation is 5,430 feet above sea level. Those of you coming from sea level may feel tired during your first few days here as you adapt to the high altitude.  Our advice is to take it easy, drink water, and avoid alcohol. Because of the high altitude, the sunshine can also be very intense.  Even if you’re not prone to sunburn, you may need to use sunscreen in Colorado.
The nearest big city is Denver, which is approximately 30 miles from Boulder. The art museum, natural science museum, zoo, and the Colorado Rockies baseball stadium are easily accessible by bus.