Gas Prices in Boulder, CO Today

Updated April 5, 2026 — Prices updated regularly from EIA data

$3.19

Average Regular Unleaded — Boulder, Colorado

Current Gas Prices in Boulder

The average cost to fill up in Boulder, Colorado is $$3.19 per gallon for regular gas right now. Compared to the national average, Boulder drivers are paying $0.80 below the national average, reflecting local market dynamics.

Fuel TypePrice / GallonGradeTrend
Regular Unleaded$3.1987 octane▲ Rising
Mid-Grade$3.6989 octane▲ Rising
Premium$3.9891-93 octane▲ Rising
Diesel$4.32N/A▲ Rising

Price Comparison

Boulder Average
$3.19
Regular Unleaded
Colorado State Average
$2.93
$0.26 above the Colorado average
National Average
$3.99
$0.80 below the national average

About Gas Prices in Boulder

The Boulder fuel market reflects Colorado's broader pricing environment while adding local demand characteristics. With a growing population and rising commuter traffic, demand pressure in Boulder is steady. Warehouse club stations and discount brands regularly beat street prices by 10-20 cents per gallon.

Gas Prices by Brand in This City

Estimated prices based on brand modifiers. Sorted cheapest to most expensive.

CHEAPEST
Costco
$3.04
Speedway
$3.16
Circle K
$3.17
Sunoco
$3.20
Marathon
$3.21
BP
$3.23
Mobil
$3.24
Exxon
$3.25
Shell
$3.27
Chevron
$3.29

Fuel Type Prices in This City

Regular Unleaded
87 octane
Premium Gasoline
91-93 octane
Diesel Fuel
N/A

Gas Prices in Nearby Cities

Arvada$2.89Thornton$3.02Lakewood$3.20Denver$3.18Aurora$2.99Fort Collins$3.10Cheyenne$3.00Colorado Springs$3.20Laramie$3.20
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Frequently Asked Questions

Costco offers the cheapest gas wherever it operates in the Boulder area. Among street stations, Circle K, Speedway, and Wawa (in applicable markets) consistently offer below-average prices. Shell, Chevron, and BP typically price above the local average.
At today's Boulder average of $$3.19 per gallon, a standard 13-gallon sedan tank costs ${fillCost} to fill. A larger 20-gallon SUV or truck tank runs ${truckFill}. Choosing the cheapest local station can save $3-5 on each fill-up.
Monday and Tuesday are statistically the cheapest days to buy gas in most US cities including Boulder. Prices rise Thursday through Sunday as weekend driving demand increases. Filling up Tuesday afternoon before price adjustments is a reliable strategy.
Boulder and surrounding cities typically track similar fuel prices given shared supply infrastructure. Differences of 5-15 cents between nearby cities are common depending on local tax differences and competition levels.
A 10-cent savings on 15 gallons equals $1.50. If the cheaper station is 5 miles away and your car gets 25 MPG, the detour costs about 0.4 gallons. Savings above 15 cents per gallon are consistently worth moderate detours.

Related Gas Price Pages

Gas Prices in ColoradoCheapest Gas in BoulderGas Prices Near BoulderCompare All StatesRegular Unleaded in BoulderPremium Gasoline in BoulderDiesel Fuel in BoulderShell - BoulderExxon - BoulderBP - BoulderChevron - BoulderMobil - BoulderGas Prices in ArvadaGas Prices in ThorntonGas Prices in Lakewood