Rock Salt for Ice Melting

Start With Your Lowest Temperature

Rock salt is the right tool for a lot of winter days, but not all of them. It works best down to roughly 15°F. Below that it slows down, and in hard cold it can sit on the ice without doing much. If most of your storms come in the 20s and low teens, rock salt gives you the most melting for the money. If you regularly see single digits or below, pair it with a colder-working product or switch to calcium chloride for the worst days.

Some products list their own rating. Peach Country Old Salt Halite, for example, is labeled to about 5°F. Always go by the package for the product you buy.

How Rock Salt Works

Salt lowers the freezing point of water. When rock salt lands on ice, it pulls in a little moisture and starts to form brine. That brine eats down through the ice and loosens its grip on the pavement, so you can shovel or scrape it away.

Rock salt needs a little moisture and some warmth to get going, which is why it is at its strongest in moderate cold. Clearing loose snow before you spread it lets the salt reach the ice directly.

Which Rock Salt Should You Buy?

Pails for Steps and Small Areas

Resealable pails keep salt dry and are easy to carry to the front steps. Choose the Rock Salt Ice Melt Pail, the Halite Crystals Ice Melt Pail or Sal para Nieve, each in 8, 20 and 45 lb sizes.

50 lb Bags for Driveways and Lots

For long driveways, parking areas and properties you maintain all winter, 50 lb bags are the economical way to buy. Options include EveryMan's Rock Salt, Peach Country Old Salt Halite, Safe Step 3300 in large pellets, and Morton Rock Salt and Vaporizer Rock Salt in 25 or 50 lb bags.

Treated and Blended Salt

If you want rock salt to work a bit harder, look at a treated or blended product. GTS Green Treated Salt is treated salt with magnesium chloride. MeltMaxx blends rock salt with calcium chloride and is rated to -15°F.

Compare Our Rock Salt

Rock Salt vs Calcium Chloride

Rock salt costs less and covers a lot of ground in moderate cold. Calcium chloride releases heat as it dissolves and works in much colder temperatures, so it is the better pick for single digits and below. Magnesium chloride sits between the two and is gentler on surfaces than rock salt. A practical setup is rock salt for the driveway and a smaller container of calcium chloride for steps and entryways on the coldest days. See our calcium chloride ice melt for colder-working options.

How to Apply It

• Shovel or plow first. Rock salt works best on a thin layer of ice, not under inches of snow.
• Spread an even layer at the rate on the package. Piling it on does not melt faster.
• Use a spreader on driveways and lots so coverage is even and nothing is wasted.
• Give it time. Once the ice loosens, shovel or scrape it away.
• Sweep up leftover salt after the storm so it does not get tracked indoors or washed into planting beds.

What to Watch Out For

• New concrete: any deicer can damage concrete less than one year old. Do not use rock salt on it.
• Deep cold: below roughly 15°F, rock salt slows down. Switch to a colder-working product.
• Lawns and plantings: keep salty snow and runoff away from grass edges and beds.
• Pets: rock salt is not a pet-friendlier formula. If dogs use the walk, see our pet and concrete safe ice melt.
• Ice cream salt: the rock salt used in ice cream makers is a separate product sold in our specialty salt collection. Do not use deicing salt for food.

How Much to Order

Application rates vary by product, so plan with the package directions in hand. As a starting point, an 8 lb pail covers a few steps and a short walk, 20 and 45 lb pails handle a typical walkway and driveway through several storms, and 50 lb bags are the way to go for larger driveways, parking areas and anyone salting all season. Rock salt stores well when kept dry, so buying enough for the winter before the first storm saves a scramble later.

Buying by the Pallet

We sell at one price for everyone, with no contractor tiers and no volume discounts, so a property manager pays the same per bag as a homeowner. Pallets ship by LTL freight and we quote only the freight. Request a quote on our bulk and pallet orders page.

Quick Answers

What temperature does rock salt stop working?

Rock salt works best down to roughly 15°F and slows down in deeper cold. Check each product's label, since some list their own rating. For colder weather, look at calcium chloride.

Is rock salt bad for concrete?

Any deicer, rock salt included, can damage concrete that is less than one year old, so do not use it on new concrete. On older concrete, apply a thin layer at the package rate and sweep up what is left after the ice melts.

Is rock salt the same as road salt?

Road salt is usually rock salt, which is sodium chloride. The rock salt we sell is packaged in pails and bags for driveways, walkways and parking areas.

Rock salt vs ice melt: which is better?

Rock salt costs less and works well in moderate cold. Specialty ice melts like calcium chloride and magnesium chloride cost more but keep working at lower temperatures. Pick based on how cold it gets where you are.

How much does a pallet of rock salt cost?

Pallets are priced at the same per-bag price everyone pays, plus freight. Pallets ship by LTL freight and we quote the freight for your address on our bulk and pallet orders page.

Not Sure Which Rock Salt You Need?

Tell us what you are treating and how cold it gets, and we will help you pick. Contact us or check our FAQ.