Composite vs wood decking: which is better for a Boise deck?

How do composite and wood decking compare?

Composite costs more and asks less of you; wood costs less and asks for a finish every few years. The table puts the two woods most often used in the Treasure Valley next to capped composite on the points that matter here.

When should you choose composite?

Choose composite when you value years without refinishing more than the lower build cost of wood. It is also the safer choice when a deck is hard to reach for maintenance or when an HOA wants the color to stay as approved.

• You do not want to clean and stain every two to three years, or you know you will not keep up with it.
• The deck is a second-story build where sanding and staining means ladders and staging.
• Your HOA approved a specific color and expects it to stay that color.
• You plan to stay long enough for avoided staining costs to cover the higher price.
• The deck will be shaded by a cover or faces east or north, so surface heat is less of a concern.

Composite still sits on a treated-wood frame, so the framing, footings and ledger flashing need the same care as on a wood deck. Our composite decks page covers the build, and the composite deck cost guide prices it by size and height.

When wood is the better choice

Wood wins on price, on surface temperature and on flexibility. If the budget is fixed, the deck is low, or you like the look of real grain and do not mind a weekend of staining every couple of summers, wood makes sense.

• The budget would otherwise shrink the deck. A bigger wood deck can be more useful than a smaller composite one.
• You may sell within a few years. Regional resale estimates favor wood in percentage terms (more on that below).
• The deck faces west with no shade and you go barefoot. Wood stays cooler than composite of a similar shade.
• You want to paint or use a solid stain to match the house trim.
• You prefer real cedar's look and smell and accept that it weathers.

Between the two woods, cedar vs pressure-treated decking explains which suits which deck, and the wood deck cost guide has the numbers.

How the Treasure Valley climate treats each material

Boise is hard on wood in a dry way rather than a wet one. The stress comes from sun, low humidity and repeated freezing, not from constant rain.

Freeze-thaw

The Boise airport records 108 sub-freezing nights in an average year (NOAA 1991–2020) and 16 days when the high never passes 32°F. Water that gets into wood checks freezes and widens them; capped composite absorbs very little, so it shrugs off the cycling better. The frame under either surface is wood, so joist tape and good drainage matter on both.

Dry air and checking

Annual precipitation averages just 11.51 inches, so boards dry out fast after rain and stay dry through summer. Wood shrinks as it dries and forms checks, splits and cupped edges, especially flat-sawn treated pine. Composite does not check, but it does expand and contract with temperature, which is why manufacturers specify gaps by installation temperature.

Heat and high-elevation sun

Summer highs reach 90°F on roughly 55 days in a normal Boise year, and the valley floor sits at 2,867 feet. The EPA notes that the UVB reaching the ground depends on latitude, altitude and season, and Boise's clear, dry summers add to the dose. UV grays unfinished wood quickly; it fades capped composite far more slowly, but dark composite boards get hot. Our guide to decking for full sun covers the heat side in detail.

Snow

Snowfall is light by mountain standards: 17.6 inches in a normal Boise winter, most of it between December and February. Both surfaces handle that easily if you clear them with a plastic shovel. Metal blades scratch wood and composite alike, and ice-melt products should be checked against the decking maker's care guide before use.

Is composite decking worth the extra cost in Boise?

It is worth it when the maintenance you skip is worth more to you than the price gap. For a 300-square-foot raised deck the 2026 market ranges work out to $7,000–$13,500 for treated pine against $11,000–$21,000 for composite. Ask a local finisher what one clean-and-stain of your deck costs, count how many you would pay for before you move, and set that total against the gap. Long ownership and a sunny, exposed deck tip it toward composite; a short horizon tips it toward wood.

Resale surveys point the other way. In the 2025 Cost vs. Value report from Remodeling / JLC, the Mountain region numbers (Idaho plus several neighboring states) show wood deck additions recovering roughly 97% of their cost at sale, against 82.1% for composite. Real estate professionals supply those estimates, and the gap mostly reflects the cheaper wood project rather than better performance.

Wildfire risk in the Foothills

Neither ordinary lumber nor standard composite is ignition-resistant. Most Foothills lots fall inside the IR1 area of Boise's wildfire overlay, generally north and west of Hill Road, where ignition-resistant construction rules apply, and only particular products carry fire listings. TimberTech states that its Edge Prime boards are Class C and not WUI compliant, while its AZEK Vintage collection is Class A and Ignition Resistant. A California State Fire Marshal listing for TimberTech Pro Reserve grooved boards runs through June 30, 2027.

How Boise applies its WUI rules to a deck surface should be confirmed with Boise Fire before you choose. The Foothills wildfire decking guide walks through the options.