City in Colorado, United States
Boulder
Fit, outdoorsy college town below the Flatirons, with trails from the edge of town, cafés and a strong startup scene. Compact and bike-friendly, but pricey, with limited nightlife and 1,650 m altitude.
At a glance
- Safety4/5Safe with normal careDetails
- Monthly budget$4,000–5,500Comfortable, one person · $4,000–5,500Details
- Value for money7/100Better value than 6% of places we coverDetails
- Best time to goApr–Jun, Sep–OctWarmest: Jul, 33°CDetails
- Air quality5.3 µg/m³PM2.5 annual average (2022) · Fairly cleanDetails
- Internet307 MbpsFixed broadband, United States medianDetails
- Tap waterYes, drinkableCity tap water from mountain snowmelt is safe and good; treat stream water on trails.Details
- LGBTQ+5/5Very welcomingDetails
- Solo travel4/5English: spoken almost everywhereDetails
- Doctor's visit$150–300Private clinic, without insuranceDetails
- Getting aroundUberWalkable centerDetails
- Cash or cardCards almost everywhereCards and contactless accepted almost everywhere; cash for tips and some farmers' market stalls.Details
Where to stay in Boulder
Areas visitors base themselves in.
| Area | Good for |
|---|---|
| Pearl Street / Downtown | First-timers: pedestrian mall, restaurants, bike paths |
| The Hill | Students, live music and cheaper rooms next to campus |
| North Boulder (NoBo) | Quieter, local cafés, art district and trail access |
| Table Mesa / South Boulder | Residential, trailheads, supermarkets |
Apps that work in Boulder
- Maps: Google Maps
- Messaging: iMessage/SMS
- Transit: real-time public transport in most cities
- OpenTable: restaurant reservations
- Taxis: Street hailing is rare; book rideshare in advance for the airport. Biking is usually faster in town.
Cash, cards and tipping
What to carry and how to pay. Money in United States.
- Cards almost everywhere Cards and contactless accepted almost everywhere; cash for tips and some farmers' market stalls.
- ATMs: Bank ATMs charge foreign cards about US$3–5; standalone ATMs in shops often more. Decline the ATM's currency conversion.
- Tipping: Expected: 18–20% at sit-down restaurants, 15–20% for taxis and rideshare, US$1–2 per bar drink, US$2–5 per night for hotel housekeeping.
- Paying by phone: Apple Pay and Google Pay are widely accepted. Venmo, Cash App and Zelle generally need a US bank account.
Before you go
Visa and entry
- Visa Waiver travellers need an approved ESTA (US$40) before departure; apply only at esta.cbp.dhs.gov, ideally 72+ hours ahead.
- CBP has proposed making five years of social-media identifiers mandatory on ESTA; check the form's current questions and answer truthfully.
- Presidential proclamations since June 2025 restrict entry for nationals of a growing list of countries; check travel.state.gov before booking.
Emergency numbers
Police 911 · Ambulance 911 · Fire 911 · All emergencies 911
Plugs
Type A, B · 120 V, 60 Hz. Do I need an adapter?
SIM and eSIM
Prepaid SIMs at carrier stores, Walmart and Target, roughly US$25–50 for 30 days; no ID usually needed. A travel eSIM is easiest. eSIMs work for visitors.
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Sources
Prices are SoloSquare estimates; climate, air, safety and visa figures come from the sources listed. Compiled and reviewed by SoloSquare. How we compile and score this. Spotted something out of date? Tell us.