Cheapest Gas in Boulder, CO
Updated April 5, 2026 — Prices updated regularly from EIA data
$3.04
Lowest price at Costco in Boulder
Finding Cheap Gas in Boulder
Hunting down the lowest gas price in Boulder, Colorado is worth the effort. At $$3.04 per gallon at the cheapest outlet versus $$3.29 at the most expensive, you save $$3.75 on every 15-gallon fill-up.
Maximum Savings in Boulder
Choose Costco over Chevron
$0.25 per gallon
$3.75 per 15-gallon fill • $12.00 per year (est.)
Cheapest Brands in Boulder
| Rank | Brand | Est. Price | Savings vs. Most Expensive |
|---|---|---|---|
| #1 | Costco | $3.04 | $0.25 |
| #2 | Speedway | $3.16 | $0.13 |
| #3 | Circle K | $3.17 | $0.12 |
| #4 | Sunoco | $3.20 | $0.09 |
| #5 | Marathon | $3.21 | $0.08 |
| #6 | BP | $3.23 | $0.06 |
| #7 | Mobil | $3.24 | $0.05 |
| #8 | Exxon | $3.25 | $0.04 |
| #9 | Shell | $3.27 | $0.02 |
| #10 | Chevron | $3.29 | $0.00 |
Gas Saving Tips for Boulder Drivers
- Keep your tires properly inflated to the manufacturer's recommended PSI — under-inflated tires reduce fuel economy by up to 3%, costing you money every mile.
- Accelerate and brake gradually. Aggressive driving can reduce fuel economy by 15-40%, directly increasing how often you fill up.
- Track weekly price cycles in your city — most markets follow predictable weekly patterns. Identifying yours and filling on low-price days saves 5-15 cents per gallon consistently.
- Fill up before holiday weekends. Memorial Day, Fourth of July, and Labor Day consistently see 10-25 cent price spikes as demand surges. Topping off Thursday before a holiday weekend beats the rush.
- Download the Upside app for cashback on gas purchases — users report average savings of 20-30 cents per gallon on qualifying transactions.
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