FrostList

When to Prep Your Snow Blower in Florissant, MO

ON TRACK157 days until first 1″ snow (estimated)Dec 15

The first plowable snow in Florissant is estimated near December 15 (NOAA snowfall normals), so service the machine by November 24 — roughly three weeks ahead — with fresh, stabilized fuel and a test start. Year to year the date swings about 28 days, which is why the live outlook beats the calendar.

OUTLOOK

Typical first first 1″ snow (estimated) near Dec 15; local deadline about Nov 24. The live 10-day outlook loads here.

Local freeze dates for Florissant

ThresholdEarly (1-in-10)MedianLate (9-in-10)
32°F (light freeze)Oct 23Nov 4Nov 18
28°F (hard freeze)Nov 2Nov 13Nov 30
24°F (severe)Nov 8Nov 24Dec 11

NOAA station: St Louis Lambert Intl AP · 3.7 mi away · 531 ft elevation · est. first 1" snow: Dec 15.

Numbers for Florissant come from St Louis Lambert Intl AP, 3.7 miles away at 531 feet, where the medians fall 32°F by Nov 4, 28°F by Nov 13, 24°F by Nov 24. The 28°F freeze has come as early as Nov 2 and as late as Nov 30, a 28-day spread. Spring's last 32°F freeze clears around Apr 2. Snowfall averages 17 inches a year, first reaching an inch near December.

In Florissant, freezing nights (32°F) typically begin around Nov 4 and the first hard freeze (28°F) follows near Nov 13. Year to year, the first 32°F night has fallen anywhere from Oct 23 to Nov 18 — about 26 days apart. Spring's final freeze lands near Apr 2 and as late as Apr 17, so that is when outdoor water and stored gear can safely come back online. Snowfall averages roughly 17 inches a year — enough that a working snow blower and a clear roof edge earn their keep.

Your snow blower checklist

  1. Change the oil and check the level; cold-thickened old oil makes the engine harder to pull over.
  2. Drain summer-old fuel and refill with fresh gasoline, then add stabilizer so it stays good through the season.
    Helpful gear: Fuel stabilizer — Recommended pick
  3. Inspect the spark plug and swap it if the tip is dark or worn; a fresh plug is a cheap no-start fix.
    Helpful gear: Replacement spark plug — Recommended pick
  4. Check the shear pins and keep spares on hand — they break on purpose to protect the auger gearbox.
    Helpful gear: Shear pin kit — Recommended pick
  5. Set the tire pressure to the 15–20 psi range printed on the sidewall so the machine tracks straight.
  6. Lubricate the auger and chute controls and confirm the chute rotates and tilts freely.
  7. Do a test start now, well before the first storm, so any repair happens before the shop lines form.
  8. Keep a good shovel by the door for steps and for the day the machine still will not cooperate.
    Helpful gear: Backup snow shovel — Recommended pick

What to have on hand

Fuel stabilizer
Additive that keeps stored gasoline from gumming the carburetor.
Recommended pick
Shear pin kit
Spare pins that break on purpose to save the auger gearbox.
Recommended pick
Replacement spark plug
A fresh plug is the cheapest fix for a hard-starting engine.
Recommended pick
Backup snow shovel
A good shovel for steps and the day the machine will not start.
Recommended pick

What this means locally

Compared with nearby cities, Florissant's first-freeze date near Dec 15 sits close to St. Charles (Dec 15) and close to St. Louis (Dec 15). Missouri's deadlines span Oct 25 to Nov 24 statewide — one date for all of Missouri would be off by weeks for Florissant. Once you know Florissant's freeze date, use it to keep your roof edge clear and protect your pipes too.

Other winter jobs in Florissant

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

Sprinklers → Nov 3Frozen pipes → Oct 23Ice dams → Nov 15Car battery → Nov 13Sump pump → Apr 2RV → Nov 3Boat → Nov 6Motorcycle → Nov 4

See the full Florissant winter checklist, in order →

Frequently asked questions

When should I get my snow blower serviced?
Service the machine about three weeks before the first plowable snow, which here is estimated near Dec 15 from NOAA snowfall normals. Servicing early means fresh fuel, oil, a good plug, and spare shear pins are in place before repair shops fill up after the first storm.
How old can gas be in a snow blower?
Untreated gasoline can start to break down in about 30 days, gumming the carburetor and making the engine hard to start. Use fresh fuel and add stabilizer if it will sit, or run the tank dry at the end of the season. Ethanol-blend fuel is especially prone to trouble in small engines.
Why won't my snow blower start after summer?
The usual culprit is stale fuel that varnished the carburetor over the off-season. A fouled spark plug, old oil, or a clogged fuel line can also be to blame. Draining old gas, fitting a fresh plug, and adding clean, stabilized fuel solves most first-storm no-starts.
What are shear pins and how many spares do I need?
Shear pins are small bolts that connect the auger to its shaft and are designed to break if the auger hits something solid, protecting the gearbox. Keep at least two to four spares and the right size for your model, since a broken pin in mid-storm stops the machine until you replace it.
Electric vs gas snow blower for Florissant?
Electric and battery machines are quiet, low-maintenance, and fine for lighter, shallower snow and smaller drives. Gas machines handle deep, heavy, wet snow and long driveways better. Match the choice to your typical snowfall and driveway length; heavier-snow areas usually favor gas.
How many inches of snow before using a snow blower?
Most single-stage blowers work best on about two inches or more; below that a shovel or broom is faster. Two-stage machines handle deeper accumulations. Clearing in stages during a big storm, rather than waiting for it to finish, keeps the load on the machine manageable.

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