Major city · United States
BoulderBoulder, Colorado
Give Boulder 2 nights: one for Pearl Street and Chautauqua, one for the Flatirons or Eldora. Skip it as a Denver base — the bus is 1 h each way.
- Weather
- see forecast
- Currency
- USD
- Best months
- May–Jun, Sep–Oct
- avoid Jul–Aug (afternoon storms), Jan–Feb (cold, snow)
- Airport
- DEN
- Nights
- 2
Rules in force · 7Crossing between the US, Canada and Mexico by land needs …Cannabis is legal in Canada and in many US states, but ta…
- North America ↗Crossing between the US, Canada and Mexico by land needs your passport even on a day trip; rental cars need the company's written permission to cross, and most US and Canadian rental insurance stops at the Mexican border.
- North America ↗Cannabis is legal in Canada and in many US states, but taking any amount across the US, Canadian or Mexican border is a federal crime — including edibles and vapes.
- North America ↗The busiest US and Canadian national parks need timed-entry, campsite or lodge reservations in summer; release dates are months ahead.
- United States ↗Check whether you need an ESTA (Visa Waiver Program) or a visa on the official CBP and State Department sites; apply only through esta.cbp.dhs.gov, not third-party sites, and allow time before you book.
- United States ↗Several popular national parks use timed-entry or vehicle reservations in peak season; check each park's page on nps.gov and book on recreation.gov before fixing your dates.
- United States ↗Medical care is very expensive for visitors; buy travel insurance with high medical cover before you fly.
- United States ↗Tipping is expected: about 15–20% at sit-down restaurants and bars, and a tip for taxis, hotel staff and guides.
Boulder sits at the foot of the Flatirons, 24 mi (about 40 km) northwest of Denver, and is a college town built around outdoor sport: hiking, cycling, climbing and trail running start inside the city limits. It is expensive for its size, walkable in the centre, and best used as a 2-night stop on a Front Range trip rather than a day trip from Denver.
Essentials
Quick answers and what things cost
Quick answers
The questions people ask first about Boulder, one line each. Tap a card for the full answer.
- Cash or card?Currency is the US dollar (USD, $).United States-wide
- SIM or eSIMAT&T, Verizon and T-Mobile cover the country; prepaid SIMs at their stores and Walmart/Target (passport required), or an eSIM before you fly.United States-wide
- Tap waterTap water is drinkable nearly everywhere; boil or treat water from streams in parks.United States-wide
- TippingSit-down restaurant: 18–22% of the pre-tax bill.United States-wide
- Plugs & powerSockets A/B. US/Canada (A/B): fits · UK/Ireland (G): adapter · Australia/NZ (I): adapter. 120 V: UK and AU 230 V-only devices need a converter; most chargers are dual-voltage.United States-wide
- SafetyBoulder is a low-crime city by US standards; the real risks are altitude, summer lightning above treeline…
- RestroomsFree public toilets are scarce in big cities; use cafés, department stores, libraries, stations.United States-wide
- Emergency numbers911 police, fire, ambulance
- Sundays & holidaysFederal holidays close offices, banks and post offices; national parks stay open.United States-wide
- Your embassyFind your embassy's 24-hour line before you fly.
- AirportDEN Denver International Airport (RTD AB bus runs direct to Boulder; about 1 h 10 min).
- Getting aroundRTD buses cover the city and the Denver commuter corridor (Flatiron Flyer every 15 min or better).
Cost cheat-sheet
Typical prices for the everyday things, as ranges. Your currency is shown next to the local price.
- Coffee$4–7
- Sit-down mealDinner, mid-range, before tax and tip$20–35
- Street or quick mealLunch on Pearl Street$12–22
- BeerCraft beer, pint$7–9
- Metro or bus rideRTD local bus fare$3 (check)
- Budget bedHostel dorm bed, a night, per personUS$55
- Mid-range bedMid-range hotel double room, a night, per roomUS$220
- High-end bedMid-range hotel double room, a night, per roomUS$380
A day, not counting the bed: Budget US$110 · Mid US$190 · High US$320
Prices in local money; change the currency in the header to see yours next to them. Every price and the budget calculator →
Decide
What it is known for, and when the weather works
At a glance
What the city is known for, how you fly in, and where to find the phrases.
- Airports
- DEN Denver International Airport (RTD AB bus runs direct to Boulder; about 1 h 10 min)
Weather and climate
Boulder: next 7 days
Loading forecast…
Forecast: Open-Meteo (CC BY 4.0), model data for this point.
Air quality
Loading…
Model estimate (CAMS via Open-Meteo), not a street-level station; readings near busy roads run higher.
Jan
8°C46°F
−6°C21°F
5 rd
Feb
9°C48°F
−5°C23°F
5 rd
Mar
14°C57°F
−2°C28°F
7 rd
Apr
17°C63°F
1°C34°F
8 rd
May
22°C72°F
6°C43°F
9 rd
Jun
28°C82°F
11°C52°F
7 rd
Jul
31°C88°F
14°C57°F
7 rd
Aug
30°C86°F
13°C55°F
7 rd
Sep
26°C79°F
9°C48°F
6 rd
Oct
19°C66°F
3°C37°F
5 rd
Nov
12°C54°F
−2°C28°F
5 rd
Dec
8°C46°F
−6°C21°F
5 rd
High / low °C°F · rd = rain days
Arrive & move
Airports are listed under At a glance; this is how to move once you are in
Getting around
RTD buses cover the city and the Denver commuter corridor (Flatiron Flyer every 15 min or better). Downtown and the creek path are walkable; most sights sit within 2 mi of Pearl Street. B-Cycle bike share has stations downtown and near campus. A car helps for Eldora, Eldorado Canyon and trailheads.
See & do
Day-trips, door to door
Day-trips
Denver
goDoor to door: About 1 h
RTD Flatiron Flyer from Downtown Boulder Station
Runs every 15 min or better; no need to drive.
Estes Park and Rocky Mountain National Park
goDoor to door: About 1 h 30 min
Bustang summer seasonal bus from Boulder
Seasonal — check the summer timetable before planning around it.
Eldora Mountain Resort
goDoor to door: About 45 min
Car, or RTD NB shuttle in winter
21 mi west; the closest ski hill to town.
Eldorado Canyon State Park
goDoor to door: About 25 min
Car via CO-93 and CO-170
Short walks and climbing views; day-use fee applies.
Fort Collins
cautionDoor to door: About 1 h 30 min
Transfort F3X express via Longmont and Loveland
Doable as a day, better as an overnight.
Eat & sleep
Which area to sleep in
Where to sleep
Areas, not hotels: pick the one that fits your arrival time and plans.
Downtown / Pearl Street
Walk to restaurants and the creek path; priciest and noisier on weekend nights.
University Hill
Cheaper, student bars and cheap eats; 15 min walk to Pearl Street.
North Boulder / 28th St
Free-ish parking, chain hotels, 10 min drive to downtown.
South Boulder / Table Mesa
Closest to Chautauqua and the Flatirons trailheads; quiet, car useful.
Practical
What a day costs, what to watch out for, and the pocket card
Cost per day
- Budget
- $90–140 excl. bed
- Mid
- $150–230 excl. bed
- High
- $250+ excl. bed
Trip budget
| Mid-range hotel double room1 × 2 nights × US$220 | US$440 |
| Food, local transport, entries2 × 2 days × US$190 | US$760 |
| RTD AB bus, DEN to Boulder, one way2 × US$12 · check | US$24 |
| B-Cycle day pass2 × US$8 · check | US$16 |
| Eldorado Canyon State Park day-use fee1 × US$10 · check | US$10 |
| eSIM, about a week of data2 × US$15 | US$30 |
| Buffer 10%Price creep, a taxi you did not plan, one splurge | US$128 |
| Trip total≈ US$352 per person per day, bed included | US$1,408 |
2026 estimate in US dollars; flights excluded. Your choices stay in this browser.
Prices of common things
| Coffee | $4–7 |
| Lunch on Pearl Street | $12–22 |
| Dinner, mid-range, before tax and tip | $20–35 |
| Craft beer, pint | $7–9 |
| RTD local bus fare | $3 (check) |
| Rideshare, downtown to Chautauqua | $10–15 |
2026 estimate; check locally.
Watch out
Safety
- Altitude: 5,400 ft (1,650 m). Take the first day easy; drink more water than usual.
- Afternoon thunderstorms in summer — be off exposed ridges by early afternoon.
- School zones drop to 20 mph when yellow lights flash; red-light cameras are common.
- Parking near campus is ticketed aggressively; use city garages behind downtown buildings.
- Living and hotel costs run high for a city this size.
Emergency numbers
- Police, fire, ambulance
- 911
Pocket card
Fill in, then print or save as PDF
Stays in this browser only; nothing is sent anywhere.
BoulderBoulder, Colorado
Pocket card · Voykit
My bed tonight
—
—
—
To this address, pleaseTo this address, please
Emergency
- Police, fire, ambulance911
Embassy
No embassies in Boulder; consulates-general are in Denver (check the address for your country).
My embassy: —
Fare anchors (2026 estimate)
- DEN to Boulder, RTD AB: about $12, about 1 h 10 min (check)
- Boulder to Denver, Flatiron Flyer: about $6, about 1 h (check)
- B-Cycle day pass: $8 for 24 h, rides under 30 min (check)
Say or show
- How much is it? — How much is it?
- Where is the trailhead? — Where is the trailhead?
- Is there a fee? — Is there a fee?
- Can I pay by card? — Can I pay by card?
- Where is the nearest bus stop? — Where is the nearest bus stop?
- I need help. — I need help.
Tipping is expected: 18–22% at sit-down restaurants, $1–2 a drink, 15–20% taxis.
Deep dive
What this guide covers so far, and its sources
Not a trip line yet
This is a basic guide: no airport-to-bed contract, walking clusters or day plans are published for Boulder. Airport, fare and schedule details are unverified; check the operators before you fly.
What we know, and what is coming
On this page
- Best months: May–Jun, Sep–Oct · avoid Jul–Aug (afternoon storms), Jan–Feb (cold, snow) · month by month →
- 1 airport and 4 areas to sleep in
- Weather: a 7-day forecast and monthly averages
- Cost per day in 3 bands
- 5 day-trips, door to door
- 5 things to watch out for, with emergency numbers
Coming as the guide grows
- Airport-to-bed contract for DEN: last AB departure field-checked, rideshare fallback, overnight rung.
- Four walking clusters with rescue anchors: Pearl Street, University Hill, Chautauqua, Boulder Creek Path.
- Place pages with verified trailhead parking and shuttle cutoffs (Chautauqua, Flatirons, Eldorado Canyon).
- Altitude and storm fixtures so gate status can go green or red by hour.