Best Time for Outdoor Projects in Utah

Utah weather and outdoor projects

Utah has a dry climate with hot summers, cold winters and big swings between day and night temperatures. Salt Lake City sits at over 4,000 feet, so nights cool quickly even after warm days. Southern Utah is hotter and drier, while the mountains have a short summer season.

Late spring through early fall is the main window for exterior projects. Strong sun and low humidity make stain and paint dry fast, so avoid midday heat on sunny walls and decks. Summer monsoon storms bring afternoon wind and rain in some years, and winter inversions in the valleys can bring long cold, foggy spells.

Frost dates in Utah

In Salt Lake City, the median last spring freeze (32°F) is around April 8 and the median first fall freeze is around October 31, a frost-free season of about 204 days.

Frost dates matter for concrete, which must not freeze in its first 48 hours, for paint and caulk that need nights above their minimum, and for lawn care, since crabgrass preventer goes down as the soil warms in spring. See how late in fall you can stain, paint or seal.

Best time to stain a deck in Utah

In Salt Lake City, the most reliable months are May–June and September. April, August and October can also work on the right days. November–February is too cold, with average highs around 43°F. In March, nights average about 36°F, too cold for the coating to dry and cure overnight. July is hot, with average highs near 94°F and about 24 days a month at 90°F or more, so work early in the day. April is cool, with highs around 62°F, so choose the warmest afternoons. August is hot, with highs near 92°F, so start early and keep out of full afternoon sun. In October, nights average about 44°F, so finish early on mild days and check the overnight low.

Check this week’s hour-by-hour verdict with the deck staining forecast.

Best time to paint outside in Utah

In Salt Lake City, the most reliable months are May–June and September. March–April, August and October can also work on the right days. December–February is too cold, with average highs around 41°F. July is hot, with average highs near 94°F and about 24 days a month at 90°F or more, so work early in the day. In November, nights average about 33°F, too cold for the coating to dry and cure overnight. March is cool, with highs around 55°F, so choose the warmest afternoons. In April and October, nights average about 43°F, so finish early on mild days and check the overnight low. August is hot, with highs near 92°F, so start early and keep out of full afternoon sun.

Check this week’s hour-by-hour verdict with the exterior painting forecast.

Best time to pour concrete in Utah

In Salt Lake City, the most reliable months are May–September. April and October can also work on the right days. November–March averages about 21 nights a month at or below 32°F, so fresh concrete needs blankets or heated enclosures. April and October bring about 3 freezing nights a month, so pick a mild spell and keep curing blankets on hand.

Check this week’s hour-by-hour verdict with the concrete pouring forecast.

Best time to seal a driveway in Utah

In Salt Lake City, the most reliable months are June–September. May and October can also work on the right days. November–March is too cold, with average highs around 46°F. In April, nights average about 42°F, too cold for the coating to dry and cure overnight. In May, nights average about 50°F, so finish early on mild days and check the overnight low. October is cool, with highs around 66°F, so choose the warmest afternoons.

Check this week’s hour-by-hour verdict with the driveway sealing forecast.

Best time to fertilize or treat a lawn in Utah

In Salt Lake City, the most reliable months are April–June and September–October. March, August and November can also work on the right days. December–February is too cold, with average highs around 41°F. July is hot, with average highs near 94°F and about 24 days a month at 90°F or more, so work early in the day. March and November are cool, with highs around 53°F, so choose the warmest afternoons. August is hot, with highs near 92°F, so start early and keep out of full afternoon sun.

Check this week’s hour-by-hour verdict with the lawn fertilizer forecast.

Monthly weather in Salt Lake City

*Days with at least 0.1 inch of rain or melted snow. Freezing nights: average nights a month at or below 32°F. Humidity is calculated from NOAA hourly normal temperature and dew point at 3 PM.

Use the averages, then check the forecast

These ratings describe a typical month, not a particular week. A warm spell in a “poor” month can give you a good day, and a wet week can spoil a “good” one. Use this page to plan the season, then check the 7-day forecast for your ZIP code before you buy materials or book help. Each project forecast checks the hours after you finish too: overnight lows, dew and rain that would ruin fresh stain, paint, sealer or concrete.

About this data

Monthly temperatures, rain days, snowfall and freeze dates are NOAA National Centers for Environmental Information (NCEI) U.S. Climate Normals for 1991–2020 at SALT LAKE CITY INTL AP. Ratings apply the same temperature limits as our forecasts (for example, 50°F or warmer for deck stain and driveway sealer, and no freezing nights for new concrete) to the average month. Your product label always takes priority.