FrostList

When to Test Your Sump Pump in Cheyenne, WY

SEASON PASSED307 days until spring thaw test (last 32°F)May 14

Test your sump pump in Cheyenne before the spring thaw near May 14 (1991–2020 NOAA last-freeze normals) and again before the fall rainy stretch; a five-gallon bucket in the pit confirms the float and discharge in two minutes. The early-to-late range spans roughly 26 days, so treat the median as a midpoint, not a promise.

OUTLOOK

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

Local freeze dates for Cheyenne

ThresholdEarly (1-in-10)MedianLate (9-in-10)
32°F (light freeze)Sep 17Oct 1Oct 14
28°F (hard freeze)Sep 27Oct 10Oct 23
24°F (severe)Oct 4Oct 19Nov 3

NOAA station: Cheyenne WFO · 1.1 mi away · 6,119 ft elevation.

For Cheyenne, the nearest NOAA station with freeze data is Cheyenne WFO, 1.1 miles out at 6,119 feet. Median first-freeze dates there run 32°F by Oct 1, 28°F by Oct 10, 24°F by Oct 19. Year to year the 28°F date has ranged from Sep 27 to Oct 23 — about 26 days apart. Spring's last 32°F freeze clears around May 14. Snowfall averages 66 inches a year, first reaching an inch near October.

Cheyenne usually sees its first 32°F night about Oct 1, with the first 28°F hard freeze close behind near Oct 10. The 32°F date swings from Sep 17 at its earliest to Oct 14 at its latest, near 27 days. The last spring freeze averages May 14 and as late as May 28, which sets the safe window for reopening outdoor water and de-winterizing gear. Roughly 66 inches of snow fall in an average year, so a clear roof edge and a running snow blower matter as much as the freeze itself.

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

Cheyenne freezes later than Fort Collins (May 2) and later than Greeley (May 2) — a reminder that even nearby towns differ by days. Statewide, Wyoming prep dates run May 10 through May 14, which is why Cheyenne gets its own number rather than a Wyoming-wide average. The same freeze also decides when to protect your pipes and watch your roof.

Other winter jobs in Cheyenne

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

Sprinklers → Sep 30Frozen pipes → Sep 17Ice dams → Sep 15Car battery → Oct 10Snow blower → Sep 24RV → Sep 30Boat → Oct 3Motorcycle → Oct 1

See the full Cheyenne 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 May 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 Cheyenne WFO, live outlook by Open-Meteo. Sources · Methodology. Last updated: July 11, 2026.