FrostList

When to Test Your Sump Pump in St. George, UT

SEASON PASSED246 days until spring thaw test (last 32°F)Mar 14

Check your St. George sump pump before meltwater arrives — the last spring freeze averages March 14 — and again ahead of fall storms; the bucket test takes two minutes. It's a short step from frost to a hard freeze: roughly 10 days on average.

OUTLOOK

Typical first spring thaw test (last 32°F) near Mar 14; local deadline about Mar 14. The live 10-day outlook loads here.

Local freeze dates for St. George

ThresholdEarly (1-in-10)MedianLate (9-in-10)
32°F (light freeze)Oct 27Nov 10Nov 22
28°F (hard freeze)Nov 7Nov 20Dec 3
24°F (severe)Nov 18Dec 1Dec 18

NOAA station: St George · 2.6 mi away · 2,857 ft elevation.

For St. George, the nearest NOAA station with freeze data is St George, 2.6 miles out at 2,857 feet. Median first-freeze dates there run 32°F by Nov 10, 28°F by Nov 20, 24°F by Dec 1. The 28°F freeze has come as early as Nov 7 and as late as Dec 3, a 26-day spread. Spring's last 32°F freeze clears around Mar 14. Snowfall averages 1 inches a year.

Expect the first frost near Nov 10 in St. George and the first hard freeze by about Nov 20. Year to year, the first 32°F night has fallen anywhere from Oct 27 to Nov 22 — about 26 days apart. Spring's final freeze lands near Mar 14 and as late as Apr 6, so that is when outdoor water and stored gear can safely come back online. Measurable snow is rare, so the freeze near Mar 14 — not snow load — drives the local prep list.

Your sump pump checklist

  1. Pour about five gallons of water into the pit slowly and watch the float rise, the pump start, and the water drop.
    Helpful gear: Water level alarm — Recommended pick
  2. Confirm the discharge line carries water 10–20 feet from the foundation and does not drain back into the pit.
    Helpful gear: Sump check valve — Recommended pick
  3. Clear the inlet screen and the pit of gravel and debris that can jam the float or the impeller.
  4. Check the check valve for a firm click; a failed valve lets discharged water fall back and short-cycle the pump.
  5. Add a battery backup pump so the system still runs when a storm knocks out the power.
    Helpful gear: Battery backup sump pump — Recommended pick
  6. Test the backup on battery power and note the install date; batteries usually need replacing every few years.
  7. If the primary pump is 7–10 years old, keep a replacement on the shelf before it fails mid-storm.
    Helpful gear: Replacement primary pump — Recommended pick
  8. Remember that flood insurance and most homeowner policies treat pump failure separately — read your coverage.

What to have on hand

Battery backup sump pump
Second pump that runs when the power goes out mid-storm.
Recommended pick
Water level alarm
Loud sensor that warns you before the pit overflows.
Recommended pick
Sump check valve
One-way valve that stops discharged water from draining back.
Recommended pick
Replacement primary pump
A ready spare for a pump nearing the end of its life.
Recommended pick

What this means locally

Compared with nearby cities, St. George's first-freeze date near Mar 14 sits later than North Las Vegas (Feb 1) and later than Henderson (Jan 20). Utah's deadlines span Mar 14 to May 8 statewide — one date for all of Utah would be off by weeks for St. George. Once you know St. George's freeze date, use it to protect your pipes too.

Other winter jobs in St. George

Every task below is dated to St. George's own freeze and snow normals.

Sprinklers → Nov 10Frozen pipes → Oct 27Car battery → Nov 20RV → Nov 10Boat → Nov 13Motorcycle → Nov 10

See the full St. George winter checklist, in order →

Frequently asked questions

How do I test my sump pump before heavy rain?
Pour about five gallons of water into the pit slowly and watch the float rise, the pump switch on, and the water level drop. Confirm the discharge carries water well away from the foundation. Doing this before the wet season, and again in spring near the last freeze around Mar 14, catches problems early.
How often should a sump pump run?
It varies with your water table and weather; some pumps cycle every few minutes during a storm and sit idle for weeks in dry spells. Frequent cycling with no rain can signal a stuck float, a failed check valve, or groundwater seeping in. Occasional running during wet weather is normal.
How long do sump pumps last?
A typical sump pump lasts about 7 to 10 years, though hard-working pumps wear out sooner. If yours is near that age, keep a replacement on hand so a mid-storm failure does not leave the pit unattended. Testing it seasonally tells you more than age alone.
Do I need a battery backup sump pump?
If your basement floods when the power goes out, yes — storms that overwhelm the pit are exactly when the grid tends to fail. A battery backup runs the pump through an outage, which is the single most common cause of a wet basement during heavy weather. Test the backup on battery power, too.
Does insurance cover sump pump failure?
Standard homeowner policies and federal flood insurance often exclude damage from a sump pump that fails or is overwhelmed. A separate water-backup or sump-failure rider may be available. Read your policy before a storm, because assumptions about coverage are a common and costly surprise.
Why is my sump pump running with no rain?
A high water table, snowmelt, or groundwater seepage can keep the pit filling even in dry weather. A pump that runs constantly may also have a stuck float switch or a check valve that lets discharged water fall back into the pit. Check the float and the valve first.

Data: NOAA 1991–2020 normals via St George, live outlook by Open-Meteo. Sources · Methodology. Last updated: July 11, 2026.