What People Actually Want to Know
Most people asking how high Mount Hood is just want a number they can quote at a bar or put on a school project. The short answer is 11,249 feet (3,428 meters) above sea level. That's the number USGS has stamped on their maps and what every trailhead sign will tell you. But anyone who's actually climbed it or worked with topographic data knows the mountain doesn't stay exactly that height. It changes. The official elevation comes from surveys, and not just one. The 1911 measurement gave it 11,239 feet. A later survey in 1975 bumped it to 11,245. Then in 2021, a team from the USGS and Portland State University ran a full LiDAR and GPS survey that settled on 11,249 feet. The slight increase each time isn't random variation, it's a combination of more precise instrumentation and actual geological change. The summit has been growing very slightly over the decades due to volcanic activity pushing material upward while erosion chips away at the flanks. Net effect: the mountain gains a foot here and there over long stretches, then loses some during heavy snow or small rockfalls. I remember being up on the south side near the Titanium Glacier in 2023, marking positions with a handheld GPS for a local mapping group, and getting readings that varied by almost forty feet compared to the printed quadrangle map. Turns out the old topo was based on photogrammetry from the seventies and didn't account for the recent calving events on the glacier's surface. We ended up using differential GPS corrections from the nearest reference station in Government Camp to get sub-meter accuracy. Takes about twenty minutes to set up and log the correction data, way better than trusting a 1970s contour line for route planning.
Why the Number Changes
Mount Hood is an active stratovolcano, which means it's constantly deforming at a rate most people don't think about. Inflation events where magma pushes up the flank can raise the summit by several centimeters over a few months, then deflate back down. Between 2017 and 2018, for example, the summit area inflated by roughly eight centimeters before deflating again. That's tiny on a human scale but significant when you're talking about a number you might use for engineering or navigation purposes. The snowpack also skews readings heavily. If you're measuring from the top of the winter snow cap rather than the actual rocky summit point, you could be off by two to four feet in spring and early summer. I've seen climbers report summiting at 11,252 feet because the snow dome was higher than the true summit, then going back down three weeks later and finding the rock barely visible. That's not a different mountain, it's just a different surface depending on the season.
What You Should Actually Use Depending on Your Purpose
If you're filling out a trivia game, 11,249 feet is fine. If you're doing anything involving actual navigation, backcountry permitting, or scientific work, you need to know which datum the measurement is tied to. The 2021 survey used NAD 83(2011) adjustment and NAVD 88 as the vertical reference. Older sources might cite NGVD 29, which is an outdated geodetic datum that can differ by a meter or so depending on where you are in the region. Not a huge deal for hiking, but if you're comparing elevation data across different maps or datasets, mixing datums without converting will give you wrong answers, and you'll never know why. Another thing nobody tells you: the "height" you see on most apps and Google is usually a single satellite reading, often SRTM or ASTER data, which sits somewhere between 11,180 and 11,210 feet for Mount Hood. Those are decent for general purpose stuff but about thirty to sixty feet low compared to the actual surveyed value. It's not broken, it's just lower resolution. If you need accuracy, pull the USGS topographic data directly or use a GNSS receiver with correction services.
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The Downside Nobody Talks About
Here's the part most guides skip: even the 11,249 figure is only valid until the next survey. There's no permanent official number for a volcano. Every inflation event, avalanche, or glacial collapse nudges it. So if you're building something that depends on a precise elevation, treat it as a snapshot, not a law. The USGS updates the number maybe every ten to fifteen years depending on funding and activity, and in the meantime the mountain is just doing what volcanoes do. For most people that's irrelevant. If you're standing at Timberline Lodge and looking up, it's a big mountain that's taller than everything else around it for about a hundred miles. The exact number doesn't change the climb or the view. But if you need it for a reason, 11,249 feet from the 2021 survey is your best current answer.
