WorkWindow

Concrete Pouring Weather in St. George, UT: 10-Day Windows & Best Months

The concrete pouring season in St. George runs March through May — 4 months averaging at least 8 workable days by NOAA 1991–2020 normals. The single best month is October, averaging 28 days that clear every check — highs of 79°F, lows near 47°F, and a 10% daily rain chance. Below: today through day 10 against the label rules, then the year at a glance.

GOOD — every label check passes MARGINAL — one soft fail NO — hard fail or several soft

The rules this check uses

The St. George strip runs on these rows — bagged-mix consensus for DIY-scale work, ruled by the 48-hour freeze check. Structural pours answer to an engineer and ACI, not to this page.

Typical label thresholds for concrete pouring — the ruleset behind every St. George verdict above.
CheckThresholdWhy it matters
Air temperature 40–90°F — ideal 50–85°F The film (or mix) chemistry runs on temperature — both while you work and for the first hours after.
Overnight low ≥40°F during the first 48 h Curing continues after dark; the first night can undo a perfect afternoon.
Dry before no soaking (≥1.0") in the prior 24 h Checked backward from your start hour using the two look-back days in the forecast data.
Dry after <0.1" rain for 6 h after (12 h light rain after finishing still risks surface marks) The engine sums forecast rain hour by hour through the cure window for St. George.
Wind ≤20 mph (rapid surface drying up to 28 mph) Hot wind pulls bleed water out faster than the slab can handle.

Always follow your product label — formulas vary. The table above is the typical range across major manufacturers, not a promise about your can.

Best months for concrete pouring in St. George

St. George's calendar, scored: each month's days passing the temperature rules, discounted by that day's historical rain odds (NOAA 1991–2020). Not a forecast.
MonthAvg highAvg lowRain odds/dayWorkable days 
January 54°F 28°F 17% 0
February 59°F 32°F 19% 0
March 68°F 39°F 16% 10
April 75°F 46°F 11% 27
May 85°F 56°F 9% 24
June 96°F 64°F 5% 0
July 102°F 72°F 8% 0
August 100°F 70°F 10% 0
September 92°F 61°F 8% 7
October 79°F 47°F 10% 28
November 64°F 35°F 11% 1
December 53°F 28°F 15% 0

St. George compresses the whole concrete pouring year into March through May. Miss those 97 workable days and the next real window is months out: by June, average lows hit 64°F against a 40°F floor. Plan the prep work in advance and treat every GOOD chip as spendable. The Utah table ranks every listed city by the same math.

July here fails on heat, not rain: the average high of 102°F sits over the 90°F label ceiling, and 31 of 31 days typically top 90°F. Midsummer work moves to dawn or waits for October.

Sealing the same driveway later? Sealcoating in St. George wants warmer nights (50°F+) than the pour did.

Source honesty: every monthly figure on this page is the 1991–2020 normal at St George, Ut Us, 5.5 km from St. George's center — your block's shade lines and wind exposure sit on top of that baseline. Scoring details are on the methodology page.

St. George by the numbers

Prep checklist

  1. Clear the 48-hour rule first: two nights over 40°F. March opens that door in St. George; December (28°F average lows) slams it.
  2. Nothing gets mixed until the site is staged — braced forms, compacted damp base, rinsed tools, a second pair of hands.
  3. Cut plastic sheeting and weight it at the pour's edge — St. George sees rain on 10% of October days, and the 6-hour rule doesn't negotiate.
  4. Mix to a low slump — thick oatmeal, not soup; extra water now is a weak surface forever.
  5. Timing beats muscle — screed wet, float at the dull stage, and never chase bleed water with a trowel.
  6. Edge and joint with an edger + float set — control joints every 2–3 slab-thicknesses in feet.
  7. Hold the moisture in (sheeting or misting); when May nights dip toward 56°F, a curing blanket is the difference.
  8. Keep feet off 24–48 hours and cars off a week; structural pours follow the engineer and ACI, full stop.

Gear that saves a window

Transparency note: gear links here become affiliate links only when the program is enabled — today they are plain references. See the affiliate disclosure.

FAQ

What temperature is too cold to pour concrete?

The line is a 40°F low inside the first 48 hours; an actual freeze (32°F) physically damages young concrete. St. George's December nights average 28°F — firmly out — while October nights hold near 47°F. Small pours only; structural work follows engineer/ACI specs.

Can you pour concrete before rain?

The engine wants 6 protected hours; light rain later actually feeds the cure. With 19% rain-day odds in February versus 5% in June, St. George's dry-season pours barely think about this rule and wet-season pours live by the radar. For small DIY pours; structural schedules follow ACI.

How long does concrete need to be protected from freezing?

Keep it above freezing for at least the first 48 hours (the engine calls any sub-40°F low in that window a NO). In St. George that rules out roughly December-adjacent months entirely and makes shoulder-season pours a two-night forecast decision. DIY scope; anything structural follows engineer/ACI cold-weather practice.

Is it OK to pour concrete in hot weather?

To a 90°F high, yes — with shade, cool mix water, a damp subgrade, and a dawn start. Above 90°F the surface sets while the core is plastic and shrinkage cracks map the slab. St. George averages 31 such days in July, which is why summer pours here move to first light.

How long before you can drive on new concrete?

A week before tires, 24–48 hours before feet — at October-typical St. George temperatures (79°F highs). When nights slide toward 28°F, add days: cure speed is temperature. Early loads print permanent marks; the bag's cure table wins every argument.

Best season for concrete work in St. George?

The table above says October, April and May: enough warmth for the 48-hour cure, short of the 90°F ceiling. For small DIY pours that's the whole answer; structural pours schedule to engineer/ACI requirements, not to a best-months chart.

Other projects in St. George

Concrete Pouring nearby

Guides

Climatology: NOAA 1991–2020 normals via ST GEORGE, UT US (5.5 km from St. George center, elevation 2857 ft); live outlook by Open-Meteo.