Most concrete pool decks should be sealed every two to five years, but the exact timing depends on weather, sun exposure, foot traffic, and how much water the deck gets.
In harsher conditions, sealing may be needed sooner.
Signs that it is time include fading color, dullness, water soaking into the surface instead of beading up, or visible wear.
Sealing helps protect the concrete from moisture, stains, and surface damage while keeping the deck looking fresh. If the deck is stamped or colored, regular sealing is especially important.
For related decorative concrete information, see stamped concrete.