Costco Thornton Gas Prices – N. Washington St
- Regular · today
- $3.599▼ −$0.140
- Premium · today
- $4.199▼ −$0.200
USD per gallon · Last updated September 30, 2026 · This station does not sell diesel
16375 N. Washington St, Thornton, CO 80023-8907 · Open in Maps ↗
30-day range
where today sits- Regular$3.599 today · avg $3.898$3.599 low$4.059 high
- Premium$4.199 today · avg $4.588$4.199 low$4.799 high
Price history at Thornton
Last 30 days · USD per gallonView data as table
| Date | Regular | Premium |
|---|---|---|
| Sep 1 | $3.759 | $4.359 |
| Sep 2 | $3.759 | $4.359 |
| Sep 3 | $3.799 | $4.399 |
| Sep 4 | $3.799 | $4.459 |
| Sep 5 | $3.799 | $4.459 |
| Sep 6 | $3.799 | $4.459 |
| Sep 7 | $3.799 | $4.499 |
| Sep 8 | $3.799 | $4.499 |
| Sep 9 | $3.799 | $4.499 |
| Sep 10 | $3.899 | $4.599 |
| Sep 11 | $4.059 | $4.799 |
| Sep 12 | $4.059 | $4.799 |
| Sep 13 | $4.059 | $4.799 |
| Sep 14 | $3.999 | $4.699 |
| Sep 15 | $3.999 | $4.699 |
| Sep 16 | $3.999 | $4.699 |
| Sep 17 | $3.999 | $4.699 |
| Sep 18 | — | — |
| Sep 19 | $4.059 | $4.749 |
| Sep 20 | $3.999 | $4.699 |
| Sep 21 | $3.999 | $4.699 |
| Sep 22 | $3.899 | $4.499 |
| Sep 23 | $3.999 | $4.679 |
| Sep 24 | $3.999 | $4.759 |
| Sep 25 | $3.949 | $4.699 |
| Sep 26 | $3.949 | $4.699 |
| Sep 27 | $3.839 | $4.599 |
| Sep 28 | $3.839 | $4.599 |
| Sep 29 | $3.739 | $4.399 |
| Sep 30 | $3.599 | $4.199 |
Last updated September 30, 2026. Prices are collected once daily and can lag same-day changes at the pump.
Today’s price in context
At $3.599 for Regular, Thornton is tied for the 3rd cheapest of 15 Costco gas stations in Colorado today, $0.185 below the Colorado average of $3.784.
NE Denver, 17.6 mi away, is $0.060 cheaper.
- vs the US average
- $1.007 below, at $4.606
- Premium over Regular
- $0.600 — the Colorado median is $0.630
- Over the last 30 days
- down $0.160
- Days the price changed
- 12 of 29 reported days
- Cheapest day in the window
- today, at $3.599
- 15-gallon fill
- $53.98 — the cheapest it has been in 30 days
- Nearest cheaper station
- NE Denver — 17.6 mi
Thornton is located at 16375 N. Washington St, Thornton, CO 80023-8907, in Colorado. The gas station sits in the warehouse parking lot and is open to Costco members, selling Regular and Premium — this location does not sell diesel. Gas station hours are 6 a.m. – 10 p.m. on weekdays, 6 a.m. – 8:30 p.m. on Saturdays and 6 a.m. – 7:30 p.m. on Sundays, in local time.
Station details
Thornton Gas station hours
- Mon–Fri
- 6 a.m. – 10 p.m.
- Saturday
- 6 a.m. – 8:30 p.m.
- Sunday
- 6 a.m. – 7:30 p.m.
Thornton Warehouse hours
- Mon–Fri
- 10 a.m. – 8:30 p.m.
- Saturday
- 9:30 a.m. – 7 p.m.
- Sunday
- 10 a.m. – 6 p.m.
Costco gas near Thornton
- 1Westminster COWestminster, CO · 10.0 mi$3.599Regular
- 2SuperiorSuperior, CO · 10.4 mi$3.869Regular
- 3LongmontLongmont, CO · 12.4 mi$3.779Regular
- 4ArvadaArvada, CO · 14.9 mi$3.759Regular
- 5NE DenverDenver, CO · 17.6 mi$3.539Regular
Distances are straight-line. Prices across the border are shown in that country’s units (¢ per litre).
Cities near Thornton
- Costco gas prices Westminster · CO · 10 mi$3.599
- Costco gas prices Superior · CO · 10 mi$3.869
- Costco gas prices Longmont · CO · 12 mi$3.779
- Costco gas prices Arvada · CO · 15 mi$3.759
- Costco gas prices Denver · CO · 18 mi$3.539
- Costco gas prices Aurora · CO · 22 mi$3.539
- Costco gas prices Sheridan · CO · 24 mi$3.839
- Costco gas prices Littleton · CO · 27 mi$3.789
At this location
- Warehouse opened
- February 2007
- Warehouse phone
- (303) 474-3247
- Pumps open before the warehouse
- 4 hours on weekdays
Also at this warehouse: a food court, a pharmacy, an optical department and a tire center.
Costco publishes one number per warehouse; there is no separate line for the gas station.
Frequently asked questions
How much is gas at Costco Thornton today?
As of the September 30, 2026 reading: Regular $3.599 and Premium $4.199 per gallon. Prices are collected once a day, so the pump can differ.
What time does the Costco Thornton gas station open?
The pumps are open 6 a.m. – 10 p.m. weekdays, 6 a.m. – 8:30 p.m. Saturdays and 6 a.m. – 7:30 p.m. Sundays, in local time. The pumps open 4 hours before the warehouse on weekdays.
Does the Costco Thornton gas station sell diesel?
No — this station sells Regular and Premium, and has reported no diesel price in the last 30 days.
Is Costco Thornton cheaper than the average Costco station in Colorado?
Yes — at $3.599, Regular here is $0.185 below the Colorado Costco average of $3.784.
Where is the Costco Thornton gas station?
At 16375 N. Washington St, Thornton, CO 80023-8907. It sits in the Costco warehouse parking lot and is open to members only.
Do you need a Costco membership to buy gas?
Yes — a Gold Star, Executive or Business membership card has to be scanned at the pump before it will dispense, though a Costco Shop Card also works for non-members.
What payment methods does the Costco gas station accept?
Visa, PIN debit and the Costco Shop Card; US Costco fuel pumps take no cash and no Mastercard, American Express or Discover.
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