FrostList

When to Test Your Sump Pump in Lakewood, CO

SEASON PASSED296 days until spring thaw test (last 32°F)May 3

Two moments stress a Lakewood sump pump: the spring thaw near May 3 and the fall rainy season, so test before each with a five-gallon bucket in the pit. At about 5,640 feet, valley cold can run a few degrees ahead of the station reading.

OUTLOOK

Typical first spring thaw test (last 32°F) near May 3; local deadline about May 3. The live 10-day outlook loads here.

Local freeze dates for Lakewood

ThresholdEarly (1-in-10)MedianLate (9-in-10)
32°F (light freeze)Sep 24Oct 7Oct 21
28°F (hard freeze)Oct 1Oct 16Oct 30
24°F (severe)Oct 11Oct 26Nov 12

NOAA station: Lakewood · 3.7 mi away · 5,640 ft elevation.

Lakewood draws its numbers from Lakewood, 5,640 feet up and 3.7 miles away. Its median first-freeze dates are 32°F by Oct 7, 28°F by Oct 16, 24°F by Oct 26. Year to year the 28°F date has ranged from Oct 1 to Oct 30 — about 29 days apart. Spring's last 32°F freeze clears around May 3. Snowfall averages 58 inches a year, first reaching an inch near October.

The freeze arrives in two steps in Lakewood: 32°F around Oct 7, then a hard 28°F near Oct 16. That first freezing night has ranged from Sep 24 to Oct 21, roughly a 27-day spread. On the spring side, the last 32°F freeze clears around May 3 and as late as May 18 — the green light for reopening water and de-winterizing. Snow totals near 58 inches a year mean plowing and ice-dam control share the winter to-do list here.

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

Lakewood freezes close to Denver (Apr 30) and close to Arvada (May 5) — a reminder that even nearby towns differ by days. Statewide, Colorado prep dates run Apr 14 through May 10, which is why Lakewood gets its own number rather than a Colorado-wide average. The same freeze also decides when to protect your pipes and watch your roof.

Other winter jobs in Lakewood

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

Sprinklers → Oct 6Frozen pipes → Sep 24Ice dams → Sep 15Car battery → Oct 16Snow blower → Sep 24RV → Oct 6Boat → Oct 9Motorcycle → Oct 7

See the full Lakewood 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 3, 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 Lakewood, live outlook by Open-Meteo. Sources · Methodology. Last updated: July 11, 2026.