Denver International Airport (DEN/DIA)
The major hub. Connected to downtown by the RTD A-Line (37 minutes, $10.50). Cannabis is prohibited on airport property.
Resources
Colorado Travel Resources
Weather, transit, airports, rental cars, emergency numbers, and visitor centers — the practical info to make your Colorado trip run smoothly.
This is the practical companion guide to every Colorado trip — how to get around, what to pack, where to land, and who to call if something goes sideways. Pin this page before you fly out.
Weather information
Colorado's weather is famously variable. Front Range summers run 80–95°F; mountain towns are 20°F cooler. Winter brings 0–30°F lows in the mountains. Check noaa.gov, weather.gov/bou (Denver/Boulder), and cotrip.org for road conditions.
Airports
Colorado Springs Airport (COS)
Smaller, useful for southern Colorado access.
Aspen-Pitkin County Airport (ASE)
Direct ski-town access, weather-sensitive.
Eagle County Regional (EGE)
Gateway to Vail and Beaver Creek; winter charter activity.
Grand Junction Regional (GJT)
Western Slope hub for Mesa, Glenwood, and the Western Slope.
Transportation options
RTD light rail & bus (Denver/Boulder)
A-Line to DIA, light rail through Denver, Flatiron Flyer to Boulder. Day passes available.
Rental cars
Essential for mountain travel. AWD strongly recommended in winter. Major agencies at DIA and downtown Denver.
Bustang intercity bus
CDOT's regional bus system connecting Denver to Glenwood Springs, Fort Collins, Colorado Springs, and Estes Park.
Amtrak
California Zephyr stops in Denver, Granby, Winter Park, Glenwood Springs, and Grand Junction. Winter Park Express runs weekends from Union Station.
Rideshare
Uber and Lyft are dense in Denver, Boulder, Colorado Springs, and Fort Collins. Spotty in mountain towns.
Shuttle services
Epic Mountain Express and Peak 1 Express connect DIA to ski towns.
Emergency contacts
- 911 — all emergencies.
- Colorado State Patrol: 303-239-4501.
- Colorado Avalanche Information Center: avalanche.state.co.us.
- Poison Control: 1-800-222-1222.
- Rocky Mountain Poison & Drug Safety: 1-800-222-1222 (handles edible over-consumption questions).
- RTD Customer Service: 303-299-6000.
Visitor centers
- Denver Visitor Center — 1575 California St, Denver.
- Boulder Visitor Information — 2440 Pearl St.
- Aspen Chamber Resort Association — 590 N Mill St.
- Estes Park Visitor Center — 500 Big Thompson Ave.
- Colorado.com — official state tourism portal.
Recommended apps
- COtrip — real-time road conditions and closures.
- Recreation.gov — campground and timed-entry reservations.
- Weedmaps / Leafly — current dispensary menus and reviews.
- AllTrails / Gaia GPS — offline trail maps.
- Epic Mix / Ikon Pass app — ski resort lift status and stats.
Interactive map
Denver International Airport (DIA) is the primary gateway to Colorado
Frequently asked questions
What's the best way to get from DIA to downtown Denver?
The RTD A-Line commuter train: $10.50 one-way, 37 minutes, runs every 15–30 minutes from early morning through midnight.
Do I need a rental car in Colorado?
For Denver and Boulder, no — transit, rideshare, and walkability cover most needs. For mountain towns, yes — a rental (preferably AWD) opens up the state.
What's the emergency number in Colorado?
911 for all emergencies. For non-emergencies and trail rescues, call Colorado State Patrol (303-239-4501).
