Quick Verdict
Pick Denver for mile-high altitude, Red Rocks shows 15 minutes west, and Rocky Mountain Park 90 minutes north. Pick Key West if Hemingway's six-toed cats, Mallory Square sunset rituals, and Conch Republic looseness define the trip.
🏆 Key West wins 74 OVR vs 71 · attribute matchup 3–2
Key West
United States
Denver
United States
Key West
Denver
How do Key West and Denver compare?
Two of the more eccentric American destinations, and a perfect inland-versus-island fork when you have a long weekend somewhere in the lower 48. Denver sits exactly one mile up at 5,280 feet — altitude real enough to floor first-time visitors before noon, with the Rocky Mountain National Park gateway 90 minutes north, Red Rocks Amphitheatre 15 minutes west, the restored 1881 Union Station as the country's best urban train hall, and legal recreational cannabis since 2014. Key West is the southernmost point in the continental US — 90 miles to Cuba, an island that briefly seceded as the Conch Republic in 1982, Hemingway's six-toed cats still roaming the Whitehead Street home, the 1.25-mile Duval Street running through Old Town, and the nightly Mallory Square sunset celebration that has been a 50-year ritual.
The mid-range budgets diverge sharply: Denver runs 305 USD/day, Key West runs 350 USD/day with seasonal hotel spikes that push closer to 600 in February. There is no good direct connection — Denver (DEN) to Key West (EYW) typically routes through Miami or Orlando on American or Delta for 320-450 USD round trip, around 6 hours travel each way. Denver peaks May-June and September-October when the mountains are accessible without serious snow gear; Key West peaks December through April (which is also the high-rate window) and goes hurricane-quiet through summer. Both score 5 on walkability inside their cores, though Denver wants a rental car for any mountain access.
Pick Denver for altitude, breweries, Rocky Mountain access, and a city that doubles as a gateway to skiing, hiking, and Red Rocks concerts. Pick Key West for tropical Conch Republic eccentricity, Hemingway pilgrimages, key lime pie at Kermit's, and a Yankee Freedom day trip out to the empty Dry Tortugas National Park 70 miles offshore. Pro tip: rent a bike rather than walking Key West — the island is flat, the cabs gouge, and the daily 8 USD rental gets you from Old Town to Fort Zachary Taylor State Park (the best beach) in 12 minutes flat.
💰 Budget
🛡️ Safety
Key West
Key West is generally a safe small city for tourists. Old Town is well-policed and busy; the main risks are alcohol-related incidents (Duval Street late-night), aggressive scooter rentals on busy streets, sun exposure, and the seasonal hurricane risk. Petty theft from rental scooters and unattended beach belongings does occur. The island's relaxed, party-oriented culture means common sense is your best safety tool.
Denver
Denver is generally safe for visitors in core neighborhoods (LoDo, RiNo, Capitol Hill, Cherry Creek, Wash Park), but property crime and visible homelessness have both risen sharply since 2020. Car break-ins are extremely common — never leave anything visible. The 16th Street Mall and stretches of Colfax Avenue have a rougher feel at night. The bigger danger for most travelers is environmental: altitude, sun, and weather catch visitors off guard.
🌤️ Weather
Key West
Key West has a tropical savanna climate moderated by surrounding water — temperatures stay narrowly between 18°C (winter low) and 32°C (summer high) all year. There is a wet season (May–October, with afternoon thunderstorms and hurricane risk) and a dry season (November–April, which is also peak tourist season). Hurricane risk is real — Hurricane Irma in 2017 caused major damage to the Lower Keys.
Denver
Denver has a semi-arid, high-altitude climate with 300+ days of sunshine a year and very low humidity. The altitude and dry air make the sun intense — UV levels are routinely "very high" even in winter. Weather is famously volatile: 70°F one afternoon and snowing the next morning is standard. Afternoon thunderstorms roll off the Front Range most summer days; big snowstorms punctuate winter. Hydrate aggressively regardless of the season — the combination of altitude and dry air dehydrates visitors fast.
🚇 Getting Around
Key West
Key West Old Town is small (about 2 miles by 4 miles total island) and the historic centre is almost entirely walkable. Bicycles are the favourite local transport — flat terrain, dedicated bike lanes, and bike racks everywhere. The Duval Loop bus is free; Uber and Lyft operate but are more expensive than in Miami. Renting a car for the week is unnecessary unless you're visiting other Keys; parking in Old Town is scarce and expensive ($4-8/hour, $25/day in city lots).
Walkability: Old Town is one of the most walkable small-city centres in America — flat, compact, shaded by tropical canopy, and full of architectural detail. The full Duval Street walk takes 25 minutes end to end. Bicycles extend the comfortable range to the entire island.
Denver
Denver is a sprawling car-oriented metro with a workable (by US standards) light rail and commuter rail network operated by RTD. The A Line train from Union Station to the airport is one of the best airport transit links in any US city. Core neighborhoods (LoDo, RiNo, Capitol Hill, Wash Park) are walkable individually, but connecting them typically means rideshare or transit. Rideshare is cheap and ubiquitous.
Walkability: Denver is walkable within neighborhoods but sprawling overall. LoDo, RiNo, Capitol Hill, Cherry Creek, and Wash Park each work on foot. Connecting them means rideshare, transit, or cycling. The altitude makes the first 24-48 hours of walking unexpectedly tiring — go slower than you think you should. Summer sun at 5,280 ft is aggressive even in cooler temperatures.
📅 Best Time to Visit
Key West
Jan–Apr, Dec
Peak travel window
Denver
May–Jun, Sep–Oct
Peak travel window
The Verdict
Choose Key West if...
you want a quirky, walkable, southernmost-US tropical destination with Hemingway history, the Conch Republic, the best key lime pie, and a daily sunset ritual
Choose Denver if...
you want a mile-high Rockies gateway — breweries, legal cannabis, Red Rocks, and ski towns an hour west
Key West
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