I-84: Portland → Ontario
Three hundred seventy-four miles from Portland through the Columbia River Gorge to the Idaho border at Ontario. The Gorge brings wind and ice. The Blue Mountains east of Pendleton bring the steepest grade on the route.
By the numbers.
This corridor needs a plan in winter.
Two separate sections of this route get winter advisories for different reasons. The Columbia River Gorge, between Troutdale and The Dalles, gets sustained winds that can exceed 50 mph and freezing fog that ices the road surface even when it isn't actively snowing. Cabbage Hill, the grade between Pendleton and La Grande through the Blue Mountains, is steep enough that ODOT posts chain requirements most winters. Check ODOT TripCheck for both the Gorge and Cabbage Hill separately before a winter run — conditions in one don't tell you anything about the other.
Every stop, start to finish.
Plotted west to east. Scroll the route — each station lights up as you reach it.
The drive, in detail.
I-84 across Oregon is really three different drives stitched together. From Portland through the Columbia River Gorge to The Dalles, it’s a scenic river-canyon route with strong charging and a wind problem. From The Dalles to Pendleton, it’s 130 miles of high desert with two NEVI-funded sites still under construction and not much else. From Pendleton to the Idaho border, it’s a climb over the Blue Mountains followed by a long descent into the Treasure Valley.
The gap between The Dalles and Pendleton is the one to plan around. Biggs Junction and Boardman both have NEVI awards in the pipeline — Biggs Junction under construction for a Q4 2026 opening, Boardman funded for Q2 2027 — but neither is live yet. Until they are, that stretch is the longest charging gap on this corridor, and it falls in a region where summer heat and winter cold are both extreme.
This guide runs west to east, Portland to Ontario, which is also the direction of the climb out of the Gorge and over the Blue Mountains. If you’re continuing into Idaho, the I-84 Idaho guide picks up where this one ends. For the rest of what’s happening with charging in Oregon, see the Oregon EV charging hub, and for help planning the rest of your trip, see our EV road trip planner.
One more thing before you set your buffers. If a stop on this corridor has ever taken twice as long as the app predicted, that has five specific and predictable causes — cold packs, shared power cabinets, the taper above 80% charge, and the gap between rated and delivered speed. We break down each one in Why Your EV Charging Stop Took Twice as Long as the App Promised.
Quick answers for this drive: what a road trip’s worth of fast charging costs, what to do when a charging stop is broken on arrival, whether you need a Supercharger adapter, whether Tesla or Electrify America is cheaper, and whether the NEVI program is still active.
Driving this corridor between November and April? The winter version of this route — cold-weather range loss, charger derating, and single-stall risk on the passes — is covered in Winter Mountain-Pass Charging: I-70, I-90, and I-84 in Snow.
Carrying the wrong adapter is a common cause of a stalled stop on this corridor. Our NACS vs. CCS vs. J1772 compatibility guide covers exactly which adapter your vehicle needs at any station type.