Choosing Flagstone: Types, Colors & What to Look For on the Pallet

Flagstone is flat, naturally split stone — typically sandstone or quartzite in Utah — used for patios, walkways, and steps. Choosing well comes down to three things: thickness (1"–1½"+ for stone set in sand or soil, thinner only for mortared work), color that matches your home’s undertone, and pallet quality — consistent thickness and large, sound pieces. Because every pallet of natural flagstone is unique, the smart move is hand-picking yours in person at Kilgore Landscape Center in West Jordan.

Few materials transform a yard like flagstone. A poured patio is a slab; a flagstone patio is a landscape feature. But flagstone is also the material where buying blind goes wrong most often, because no two pallets are alike. Here’s how to choose flagstone like someone who has opened a few hundred pallets — which, collectively, our yard crew has.

What Is Flagstone, Exactly?

Flagstone isn’t one type of rock — it’s any stone that naturally splits into broad, flat pieces. In the Intermountain West, that usually means:

• Sandstone — the classic. Warm buffs, reds, and browns; splits cleanly; comfortable texture underfoot
• Quartzite — harder and denser, often with silvery or gold shimmer; outstanding durability
• Slate-type stones — darker, smoother; used more for accents in our climate

Utah’s own geology supplies much of the flagstone sold along the Wasatch Front, which is why the warm sandstone palette looks so at home against local architecture. You can browse current pallets in our flagstone collection before visiting.

Flagstone Thickness: The Spec That Makes or Breaks a Project

Before color, before shape — check thickness, because it must match your installation method:

Dry-set installation — flagstone over a compacted road base and sand bed — is the most popular method in Salt Lake Valley yards because it flexes with our freeze-thaw cycles instead of cracking the way rigid mortar can.

Matching Flagstone Color to Your Home

The same undertone logic from our decorative landscaping rocks color guide applies to flagstone, at patio scale:

• Warm homes (tan stucco, cream brick): buff, gold, and red sandstone
• Cool homes (gray, white, modern): silver quartzite, gray-toned stone
• Either: variegated stone carrying multiple tones — the most forgiving pick

One flagstone-specific tip: wet a sample. Flagstone darkens and saturates when wet, and your patio will spend spring mornings and every rainstorm in that wetted state. Choose a stone you like both dry and wet.

Reading a Pallet Like a Pro

Standing in front of pallets at our West Jordan yard, check four things:

1. Piece size. Larger pieces (18"–36") make a patio look intentional and lay faster. Pallets of small fragments mean more joints, more cutting, more fiddling.
2. Thickness consistency. Flip through the stack edges. A pallet that swings from ¾" to 2" will fight you at every joint on a dry-set patio.
3. Soundness. Tap suspect pieces — a dull thunk instead of a crisp ring can signal internal fractures that split in the first winter.
4. Coverage. A ton of 1"–1½" flagstone covers roughly 80–100 square feet laid out. Measure your patio and translate before you fall in love with a color.

This is exactly why we encourage customers to hand-pick their flagstone pallets in person — the pallet you inspect is the pallet you get.

Flagstone for Steps and Slabs

For grade changes, thin flagstone won’t do — you want thick slab material with real mass. Our slabs and rock steps collection carries step-grade stone; we’ll cover building stone steps that survive Utah winters in a dedicated guide later this month.

Designing Flagstone Into a Water-Wise Yard

Flagstone earns its place in Utah’s water-conscious designs. One approach that dominates new valley landscaping is built around a central open shape connected by defined pathways and gathering areas — flagstone is the premium material for both. And per USU Extension’s water-wise landscaping principles, hardscaped surfaces like stone patios reduce overall irrigation demand while adding usable living space. A flagstone patio bordered by decorative rock ground cover is close to the platonic ideal of a beautiful yard that barely drinks.

Installation Basics for the Valley’s Clay

West Jordan-area soil is heavy clay that holds water and heaves when frozen — flagstone installs must respect that:

1. Excavate 4–6" below finished height
2. Compact 2–4" of road base for structure
3. Add a 1" sand leveling bed
4. Lay flagstone with ⅜"–½" joints, checking each piece with a level
5. Sweep joints full of sand or fill with gravel fines

Skipping the road base layer is the number-one cause of wavy, rocking flagstone patios in this valley. Don’t skip it.

Frequently Asked Questions

What’s the best flagstone for a patio in Utah? Sandstone and quartzite in 1"–1½" thickness are the valley standards for dry-set patios — thick enough to handle freeze-thaw movement, workable enough for DIY installation.

How much does a ton of flagstone cover? Roughly 80–100 square feet at 1"–1½" thickness. Thicker stepping-stone material covers less; call with your dimensions and we’ll convert to pallets.

Is flagstone slippery when wet? Natural cleft (unpolished) flagstone has a textured surface with good grip — one reason it’s preferred over smooth pavers around pools and on shaded north-side walks that stay damp.

Can flagstone survive Utah winters? Absolutely, when installed dry-set over a compacted base so freeze-thaw movement flexes the surface instead of cracking it. Sound, dense stone shrugs off decades of winters.

Can I pick my own flagstone pallet? Yes — and we recommend it. Every pallet is unique in color and piece character. Visit our West Jordan yard, open the pallets, and tag the ones you want.

Open the Pallets Yourself in West Jordan

Flagstone is the most personal material in the yard — no two pallets alike, no substitute for seeing yours. Visit Kilgore Landscape Center in West Jordan, Utah to hand-pick flagstone pallets, or call us to check current colors and thicknesses in stock and schedule delivery anywhere in Salt Lake County.

Sources

1. Localscapes (Utah’s statewide landscape design method — central open shape, pathways, gathering areas): localscapes.com
2. Utah State University Extension — Seven Principles for Water-Wise Landscaping: extension.usu.edu