A deck built to modern Front Range code is designed for a 30 pounds-per-square-foot snow load — several feet of dry powder, or roughly a foot and a half of heavy wet spring snow, with margin. The honest caveat: that math assumes a deck built to that code and still in the condition it was built in. The real risk isn't usually the snow. It's what the snow lands on.
How much does snow actually weigh?
Snow varies by a factor of three or four depending on water content:
| Snow type | Weight per foot of depth | Depth to reach a 30 psf design load |
|---|---|---|
| Fresh Colorado powder | ~5–7 psf | Around 4–6 feet |
| Settled/packed snow | ~10–15 psf | Around 2–3 feet |
| Heavy wet spring snow | ~15–20 psf | Around a foot and a half to two feet |
A December storm that drops fourteen inches of powder puts maybe 7 psf on the deck — a quarter of design load. A March dump of two wet feet is a different animal entirely, which is why spring storms, not January ones, are when decks get in trouble here.
And design load isn't a cliff. Code loads carry safety factors, so a sound deck at 30 psf isn't about to fail — it's at the load it was engineered to carry all season without complaint.
When does the math stop applying?
Five cases, and they cover essentially every snow-related deck failure we see:
- Decks built before modern code. If your deck went up decades ago — as plenty in Aurora's older neighborhoods did — nobody can tell its design load from the sidewalk — it might be fine, or built to no standard at all.
- Decks with existing structural issues. A rotted post base or a failing ledger doesn't announce itself in July. Snow load is often the first real test of the year. If your deck already feels bouncy, fix that before the snow votes.
- Roof-slide zones. A metre of roof snow avalanching onto one corner of the deck is a sudden point load no design table covers — especially under a smooth metal roof plane.
- Drifted snow against the house wall. Wind stacks snow against the wall far deeper than the open field of the deck, concentrating weight along the ledger — the connection that already carries half the deck.
- A snow-buried hot tub platform. The framing under a hot tub was (hopefully) sized for the tub. Bury it in wet snow and it's carrying both loads at once.
If any of those made you picture your own deck, our safety inspection guide shows what to look for, and the deck anatomy guide explains which parts do the carrying.
What are the warning signs under load?
A deck under too much snow talks before it fails. Listen for:
- New sagging or bounce that wasn't there before the storm
- Popping or cracking sounds from the framing
- Racking — a railing that's gone out of plumb
- Doors above the deck sticking — the frame is deflecting enough to pinch them
Any of these means everybody off, then remove snow carefully, working from the stairs inward. Afterward, get the structure looked at — a repair after one warning is cheap; ignoring the warning is not.
How do you clear snow without wrecking the deck?
Same rules as our winter prep checklist: plastic shovel, never metal. Shovel along the length of the boards, not across them. Leave the last inch and let the sun finish. And no ice melt where metal connectors live below the boards — the brine drips through the gaps and corrodes the hardware. Plain sand is safe anywhere, and our guide to ice melt on a composite deck covers what each brand allows on the boards.
The question behind the question
"How much snow can my deck hold?" usually means "I don't actually know what my deck was built to." That's not a Google-able fact — it's a look-at-the-framing fact a free structural inspection answers. Get in touch and we'll go through the posts, ledger, and framing and give you a written verdict before the first big storm: what your deck can carry, what needs attention, and what can honestly wait.
