Diesel Fuel Stops on the I-15 Corridor: Salt Lake City to Las Vegas
The drive from Salt Lake City down I-15 to Las Vegas is one of the great western road trips — about 420 miles through Utah’s canyon country, a sliver of Arizona, and into the Mojave. For diesel truck and RV drivers, the question on every leg is the same: where is the next reliable, reasonably priced diesel pump? Truck-stop diesel along the interstate is convenient, but prices swing wildly, and nobody wants to tow a fifth-wheel into a cramped fuel lane that wasn’t built for a 60-foot rig.
That’s why we plan our fuel stops around Costco warehouses. Costco fuel is consistently among the cheapest diesel in most western markets, the lanes are roomy, and the stations sit right off major interchanges. The catch: only a subset of Costco fuel stations actually sell diesel — 71 of the 689 Costco fuel stations in the US and Canada at last count — so you need to know which ones before you commit to an exit.
The map above is live: it shows every Costco diesel station in the US and Canada, and it refreshes automatically every week from Costco’s public warehouse data. Zoom into the I-15 corridor and you can see the diesel-capable warehouses around Salt Lake City, the stop in Cedar City, and the cluster in the Las Vegas valley — enough to run the whole route on Costco diesel with a comfortable margin of range to spare.
A few notes from running this route with a diesel pickup and a travel trailer: fill up in the Salt Lake area before heading south, because options thin out between Nephi and Cedar City; Cedar City’s warehouse is an easy on/off at exit 59 with a large lot; and from St. George you are roughly 120 miles from Las Vegas, where several Costco fuel stations ring the valley. If you time arrivals for mid-morning on a weekday you will usually skip the queue entirely.
Planning a similar route in another region? The same map covers every state and province, and you can embed it on your own trip-planning page for free — see the notes below this article.
About the map on this page
The map above is the free embeddable widget from CostcoDiesel.com. Site owners and bloggers can add it to any page with two lines of HTML — no signup, no API key — and it stays current automatically. This is the exact code used on this page:
<div data-costcodiesel-widget></div> <script src="https://costcodiesel.com/widget/embed.js" async></script>
Full options (state filtering, custom height) and the required attribution terms are documented on the widget page. Prefer tables or cite-ready numbers? See diesel stations by state and the station statistics.