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Calcium chloride ice melt for winter storms: temperatures, rates and safety

By the Plain Prepper editors. Updated 2026-10-17.

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Quick answer

Calcium chloride is the ice melt to stock when storms bring deep cold. The Minnesota Smart Salting guide lists its lowest practical melting temperature at -20°F pavement temperature, against 15°F for rock salt, and K-State Extension says it works down to minus 25°F. Clear the snow first, then spread it at OxyChem's starting rate of 4 ounces per square yard. Keep it off brick, stone and wood, wipe pets' paws, and store the bag sealed and dry.

How cold each ice melt works

Ingredient	Minnesota guide (lowest practical)	K-State (works down to)
Calcium chloride	-20°F	-25°F
Magnesium chloride	-10°F	5°F
Rock salt (sodium chloride)	15°F	12°F
Potassium chloride	25°F	20°F
Calcium magnesium acetate (CMA)	20°F	20°F
Urea	25°F	15°F

The two sources give different numbers (the Minnesota figures are pavement temperatures), but both put calcium chloride at the cold end. The Minnesota table comes from the University of Minnesota's Smart Winter Salt guide, adapted from the Minnesota Pollution Control Agency.

Why calcium chloride for winter storms

• Deep cold: the Minnesota guide notes most deicers contain sodium chloride, which is only effective down to about 15 degrees, and says to check a product's listed melting temperature. OxyChem says its calcium chloride sidewalk products work at temperatures as cold as -25°F.
• Extension pick: K-State's horticulture department calls calcium chloride its first pick as a deicer because it works at extremely low temperatures and is gentle on plants when used as directed.
• Read the label: many bags are blends, and the melting temperature varies with the main ingredients, the Minnesota guide says.
• Not a traction product: K-State says sand, ash or cat litter do not normally melt ice but can add traction.

Pellets or flakes

OxyChem makes both forms. PELADOW Premier pellets have a calcium chloride assay above 90%, and OxyChem says their round shape helps them penetrate ice and break its bond with pavement faster than flat or crystal shaped melters. DOWFLAKE Xtra flakes have a minimum of 83% calcium chloride, which OxyChem says is 10% higher than conventional 77 to 80% flake.

OxyChem calls PELADOW pellets ideal for clearing sidewalks, driveways and parking lots. Solid calcium chloride can also be mixed into brine: OxyChem's PELADOW sheet says a solution sprayed with a handheld lawn and garden sprayer is ideal for anti-icing against black ice or frost, and to rinse metal parts with fresh water when finished.

How much to use

1. Clear the snow first. OxyChem and K-State both say to remove as much snow and ice as you can before spreading.
2. Start at the recommended rate. OxyChem's starting rate is 28 pounds per 1,000 square feet, or 4 ounces per square yard.
3. Adjust. OxyChem says to adjust for ice thickness and temperature; thick ice may need more to undercut it.
4. Calibrate your spreader to cut waste, OxyChem advises.
5. Finish the job. Give it time to work, then clear the remaining slush.

As simple arithmetic, a 4 by 50 foot walk is 200 square feet, so the 28 pound per 1,000 square foot rate works out to about 5.6 pounds. Shovel in stages: Ready.gov warns that winter storms raise the risk of heart attacks from overexertion and says to avoid overexertion when shoveling.

Concrete, stone, wood and roofs

• Concrete: OxyChem says its calcium chloride works on concrete at least one year old that was properly designed, built and cured for winter. Porous or uncured concrete is more vulnerable to freeze and thaw damage.
• Brick and stone: OxyChem does not recommend its calcium chloride on masonry, including stone, brick and mortar joints.
• Wood decks and steps: OxyChem does not recommend deicers on wood surfaces.
• Roof ice dams: OxyChem recommends hiring a trained professional, and warns chloride melt water can corrode roofing nails and steel gutters.
• Lawns and shrubs: applied at the recommended rate, OxyChem says calcium chloride will not damage nearby grass, but over application or direct application can harm plants.

Pets, indoor floors and storage

• Pets: OxyChem says no chloride deicer is completely pet safe. Use only as much as needed, wipe paws after walks, consider paw wax or booties, store bags out of reach, and do not let pets eat deicer or treated snow.
• Entryways: do not over apply near doors, and use entrance mats that trap slush and residue.
• Storage: calcium chloride pulls moisture from the air and can turn to liquid brine, so store it dry and tightly resealed. OxyChem gives an expected shelf life of 36 months when protected from moisture.
• Caked bags: knock the closed bag against a hard surface; do not hammer it, because flying pieces may be an eye hazard.
• Mixing brine: start with cool water and add the solid slowly; OxyChem says dissolving releases significant heat, with a temperature rise of almost 84°F in one 30% flake solution example.

What to look for when you buy

Questions people ask

How cold does calcium chloride ice melt work?

The Minnesota Smart Salting guide lists -20°F pavement temperature; K-State Extension and OxyChem cite -25°F.

Is calcium chloride better than rock salt?

For deep cold, yes. Rock salt's lowest practical temperature is about 15°F in the Minnesota guide, versus -20°F for calcium chloride.

How much calcium chloride should I put down?

OxyChem's starting rate is 4 ounces per square yard, or 28 pounds per 1,000 square feet, after clearing snow.

Will calcium chloride damage concrete?

OxyChem says it is fine on sound concrete at least one year old, but not on brick, stone or mortar.

Is calcium chloride ice melt safe for pets?

OxyChem says no chloride deicer is completely pet safe. Use little, wipe paws and keep pets from eating it.

Sources

• Application Rates: What Type of Salt Should I Use? (mnltap.umn.edu), University of Minnesota Smart Winter Salt (MnLTAP), from Minnesota Pollution Control Agency data
• Choosing the Best Ice Melt Product (k-state.edu), K-State Research and Extension
• PELADOW Premier Snow and Ice Melter (oxycalciumchloride.com), OxyChem
• PELADOW Premier product information sheet (oxycalciumchloride.com), OxyChem
• DOWFLAKE Xtra 83-87% Calcium Chloride Flakes (oxycalciumchloride.com), OxyChem
• Winter Weather, Ready.gov (maker page: www.ready.gov/winter-weather)

Sources checked 2026-10-17.