Will Starlink work in a valley, on a hillside or in the mountains?

A ridge is an angle, just like a tree

Starlink doesn’t publish anything specific to valleys or mountains. What it does say applies everywhere: the dish does best with open sky and can often get by with part of it. A ridge is just a very large, very permanent obstruction, so the same test works. From where the dish would sit, how high does the skyline rise above the horizon, and on how many sides?

Two things make the valley floor harder than it looks from the road. First, both sides count: Starlink’s business install guide asks for open sky from about 20° above the horizon, all the way around (360°), for each dish., and a valley takes a bite out of the sky on two sides at once. Second, ridges are long: a tree blocks a narrow slice of the sky, while a ridge blocks a wide one.

Why a taller pole rarely beats a ridge

With trees, height is the fix: lift the dish and the treetop sinks in the sky. With ridges it hardly works, because the ridge is so far away that a few dozen feet makes almost no difference to the angle.

So in hilly country, think sideways before you think up. Starlink says that when there’s no clear view from the ground, you should use an elevated spot such as a roof, pole or wall, and that’s still right for the trees around the house. For the ridge itself, a spot a few hundred feet farther from the steepest slope, or partway up the opposite side of the valley, usually does more than any pole. Starlink publishes no minimum mounting height for homes, so let the skyline decide.

Valley floor, hillside, canyon or hollow

Typical shapes of land, with an example skyline worked out from the ground (our geometry, example numbers):

A ridge top or an open slope, whichever way it faces, is usually the easy case: the land falls away and the sky is wide. Remember that the shape of the land around your spot matters more than the elevation on the map: a house at 8,000 ft in a canyon can be harder than one at 500 ft on a hill.

Ridges plus trees: add them up

Most mountain homes have both, and trees standing on a slope add their height to it. A slope that rises 200 ft, 400 ft from the house, tops out at about 27°. Put 80 ft firs on it and the skyline climbs to about 35°, the edge of the dish’s view. On a sky map, the ridge takes the bottom of the sky all around, and the trees poke up from it.

That’s often good news: the ridge can’t be changed, but the trees near the house sometimes can, and they’re the part that matters most. For tree fixes, see will Starlink work with trees. For the math, the sky angle calculator works for ridges too: enter the ridge’s height above you and its distance.

Check a valley home in five steps

1. 01

   Step 1: Stand where the dish would go

   At the height it would sit: on the ground for a yard install, at a window or on a ladder for a roof.
2. 02

   Step 2: Trace the skyline all the way around

   Ridges are long. Sweep your eyes along each one and find its highest point as seen from you, including any trees standing on top.
3. 03

   Step 3: Count fists to the highest point on each side

   Arm straight, fist on the horizon, stack up to the skyline. Under 2 fists is out of the way; over 3.5 fists is inside the dish’s view.
4. 04

   Step 4: Repeat from a second and third spot

   Try the far side of the lot, a spot farther from the steepest slope, or partway up the opposite hillside. In terrain, a few hundred feet sideways often beats 20 feet up.
5. 05

   Step 5: Confirm the best spot with the Starlink app

   Run the app’s sky scan at that exact spot and height before you order or mount anything.

Alaska and the far north

Starlink does not say homes in Alaska or other far-north areas need a clearer or differently aimed view of the sky. The app’s alignment tool sets the aim for your location, there as anywhere. What Starlink does say about Alaska: “Customers in certain remote locations will experience higher latency (e.g. Oceans, Islands, Antarctica, Alaska, Northern Canada, etc.)” and “certain areas in Alaska are outside the installation service areas. Additional fees may be required.” If you’re planning to hire an installer, check before you count on one.

The bigger issue on the ground is usually the land itself: steep fjord walls and tall spruce and hemlock in Southeast Alaska, dense black spruce in the Interior, and deep snow almost everywhere. Starlink says “heavy snow completely covering the dish may cause intermittent connectivity or temporary loss of service”. More in Starlink in snow and which way the dish faces.