Mountain quilt patterns: triangle construction and layouts
Published 2026-10-15. Updated 2026-10-15.
A Delectable Mountains block can be sewn from half-square triangles. Scrapdash pairs one sky square with one tree square, makes two half-square triangles, stacks them, and cuts the stack into strips that sew back into a peak. The shop pages at the top of the search are a finished quilt, a pattern listing, and a scrap design for sale. They do not walk through that strip cut.
The half-square triangle mountain
Scrapdash gives two starting sizes. The traditional cut is an 8⅜-inch dark square right sides together with an 8⅜-inch light square. Draw a diagonal, sew a quarter-inch seam on both sides, and cut on the line. Those two units measure 8 inches square. The page prefers a slightly large start: cut the sky square and the tree square at 8½ inches, sew the same way, and square the units to 8 inches. Put the half-inch line of the ruler on one corner and the diagonal line of the ruler on the seam.
Stack the two 8-inch units right sides together, colors alternating, seams touching along the diagonal. Cut the stack every 2 inches. You get eight two-part strips, and the two layers are mirror images. Sew the strips in the order the page diagrams, and press the seams open or all one way. The mountain rectangle should measure 8 by 12½ inches.
Sew the road rectangle, 5 by 12½ inches, to the bottom of that mountain and press toward the dark. That is one peak with a road. The page suggests a fussy-cut car or bicycle on the road, or a water fabric instead of a road if the "road" should be a lake. Repeat the block if you want a range instead of one peak. The half-square triangle guide covers the seam and the trim if this is your first diagonal.
Other mountain layouts, and what they are not
Not every quilt called a mountain is this block.
Simply Quilting publishes a free sunset landscape by Gracey Larson. The peaks are corner-square triangles: a square on the corner of a larger piece, a diagonal seam, a trim to a quarter inch, and a press open. The page says no templates are needed. The cutting list is piece by piece, from 2¾-inch squares up to strips such as 7¼ by 54½ inches, in named solids. That is a scene, not a repeating Delectable Mountains block. Use it when you want one landscape and you are willing to follow a lettered cutting list.
See Kate Sew lists several mountain designs rather than one construction. Mountain Town is a throw with houses, a schoolhouse or church, and two kinds of trees, and the templates print from the pattern. Desert Diamond is a throw of about 40 by 52.5 inches. Snowy Mountain includes four sizes, from a wall hanging to a twin. Modern Arrows uses triangular peaks and also includes four sizes, from baby to twin. Those are layout choices you buy as patterns. They are not the Scrapdash strip cut.
Modernly Morgan describes Scrap Mountains as a scrappy outdoor design in three sizes: child or lap, square throw, and rectangular throw, written for fat quarters or scraps. The post shows a 1½-inch grid of quilting on the first version. The construction steps are not on that post. Treat it as a different pattern, not as the block above.
Pat Durbin is selling a finished quilt, 25 by 19 inches, inspired by a Colorado lake. The page says the piecing is mosaic except for the mountains and a few flowers. There is no cutting plan on the page.
How to choose
If you repeat the Scrapdash peak, keep the sky fabric the same across the row and change the tree fabric from peak to peak. The road can stay one fabric so the range sits on a shared ground. Join the mountain rectangles side by side before you add a border. A row of four peaks is a table runner. A field of peaks, with the road of one row meeting the sky of the next, reads as a range rather than as separate postcards. That join is ordinary straight seams. It is not a new triangle unit.
Pick the Scrapdash strip cut when you want a peak you can repeat and you already sew half-square triangles. The only special step is cutting the stacked units every 2 inches and keeping the mirror strips in order. Pick the Simply Quilting corner-square landscape when you want one scene and a free cutting list. Pick a template pattern, such as Mountain Town, when the design includes houses and you want the shapes drawn for you. Simply Quilting presses seams open and uses a quarter-inch seam throughout that landscape. Scrapdash presses the mountain strip seams open or all one way, then presses the road seam toward the dark. Those are the pressing directions on those two pages.
A scrap quilt setting works for the repeating peak if each mountain uses a different tree fabric and the sky stays one value, so the peaks still read from across the room.
What this page will not settle
The Scrapdash block is one designer's mountain rectangle plus a road, not every historical Delectable Mountains grid. When you cut the stacked units, keep the pair pinned until every strip is cut. The two layers are mirror images, and a strip flipped before you sew it turns a peak into a notch. Press the strip seams open if the road seam will cross them, so the bottom edge stays flat. If the mountain rectangle is not 8 by 12½ inches after the strips are joined, the road will not match the width and the next peak will drift.
Square the half-square triangles to 8 inches before you cut the strips, or the strips will not match. This page does not give yardage for a bed-sized range, because that is the block count times the sky, tree, and road cuts.
Below: north point quilt, $8.99, coming soon.
How do I make a Delectable Mountains block from triangles?
Scrapdash pairs a sky square with a tree square, sews two half-square triangles, stacks them, cuts the stack into strips, and sews the strips into a mountain rectangle.
What size squares start that block?
The exact traditional cut on that page is 8⅜ inches. Scrapdash prefers 8½-inch squares, then squares the half-square triangles to 8 inches before the strip cut.
Do all mountain quilts use half-square triangles?
No. Simply Quilting's free sunset uses corner-square triangles on rectangles. See Kate Sew lists template towns and triangle peaks. Modernly Morgan's scrap pattern is a separate paid design with three sizes.
What layout should I pick?
Use the strip-cut half-square triangle mountain if you want one peak you can repeat. Use a corner-square landscape if you want a scene without templates. Use a template town if the pattern already draws the houses.