Frostline.info

Frost line depth in Miami-Dade County, Florida

Frost reaches about 0 inches in typical soil across Miami-Dade County. Codes in this climate commonly set footing depth at 12 inches (code minimum).

No meaningful frost
Estimated frost depth
0″
typical silt/loam soil
Typical code footing depth
12″ minimum
rule of thumb for this climate
Design freezing index
0
°F-days, 100-year winter
ZIP codes covered
79
#54 of 67 counties in FL (1 = deepest)
0″12″24″36″ ground
Est. frost (typical soil) Typical code footing depth Clay–sand range

Frost depth by soil type

Soil typeEst. frost depth
Sand / gravel (drains well)0″
Silt / loam (typical yard soil)0″
Clay (holds water)0″

County average. Methodology.

Verify before you dig. These are climate-based estimates. The legally required frost depth is the figure your building department publishes in its IRC Table R301.2 (climatic and geographic design criteria). Call the Miami-Dade County building or permitting office in Florida and call 811 before digging.

Frost depth by ZIP code in Miami-Dade County

ZIPCityEst. frostCode range
33010Hialeah0″12″ minimum
33012Hialeah0″12″ minimum
33013Hialeah0″12″ minimum
33014Hialeah0″12″ minimum
33015Hialeah0″12″ minimum
33016Hialeah0″12″ minimum
33018Hialeah0″12″ minimum
33030Homestead0″12″ minimum
33031Homestead0″12″ minimum
33032Homestead0″12″ minimum
33033Homestead0″12″ minimum
33034Homestead0″12″ minimum
33035Homestead0″12″ minimum
33054Opa Locka0″12″ minimum
33055Opa Locka0″12″ minimum
33056Miami Gardens0″12″ minimum
33109Miami Beach0″12″ minimum
33122Miami0″12″ minimum
33125Miami0″12″ minimum
33126Miami0″12″ minimum
33127Miami0″12″ minimum
33128Miami0″12″ minimum
33129Miami0″12″ minimum
33130Miami0″12″ minimum
33131Miami0″12″ minimum
33132Miami0″12″ minimum
33133Miami0″12″ minimum
33134Miami0″12″ minimum
33135Miami0″12″ minimum
33136Miami0″12″ minimum
33137Miami0″12″ minimum
33138Miami0″12″ minimum
33139Miami Beach0″12″ minimum
33140Miami Beach0″12″ minimum
33141Miami Beach0″12″ minimum
33142Miami0″12″ minimum
33143Miami0″12″ minimum
33144Miami0″12″ minimum
33145Miami0″12″ minimum
33146Miami0″12″ minimum
33147Miami0″12″ minimum
33149Key Biscayne0″12″ minimum
33150Miami0″12″ minimum
33154Miami Beach0″12″ minimum
33155Miami0″12″ minimum
33156Miami0″12″ minimum
33157Miami0″12″ minimum
33158Miami0″12″ minimum
33160North Miami Beach0″12″ minimum
33161Miami0″12″ minimum
33162Miami0″12″ minimum
33165Miami0″12″ minimum
33166Miami0″12″ minimum
33167Miami0″12″ minimum
33168Miami0″12″ minimum
33169Miami0″12″ minimum
33170Miami0″12″ minimum
33172Miami0″12″ minimum
33173Miami0″12″ minimum
33174Miami0″12″ minimum
33175Miami0″12″ minimum
33176Miami0″12″ minimum
33177Miami0″12″ minimum
33178Miami0″12″ minimum
33179Miami0″12″ minimum
33180Miami0″12″ minimum
33181Miami0″12″ minimum
33182Miami0″12″ minimum
33183Miami0″12″ minimum
33184Miami0″12″ minimum
33185Miami0″12″ minimum
33186Miami0″12″ minimum
33187Miami0″12″ minimum
33189Miami0″12″ minimum
33190Miami0″12″ minimum
33193Miami0″12″ minimum
33194Miami0″12″ minimum
33195Miami0″12″ minimum
33196Miami0″12″ minimum

What this means for your project in Miami-Dade County

Deck footings & piers

Footings must bear below the frost line and at least 12″ below undisturbed ground. For planning in this area, budget for holes around 12″ deep until your permit office confirms the exact figure.

Fence posts

Set posts at least one-third of their above-ground height. Where frost heave is a problem, carry concrete footings below the frost line (about 12″ here in typical soil) and bell or taper the bottom.

Water & irrigation lines

Bury supply lines below the frost depth. Your water utility or plumbing code sets the minimum cover; freezing is rare, but exposed pipes still need insulation.

Slabs & frost-protected foundations

Frost-protected shallow foundations (IRC R403.3) use the 100-year air freezing index — 0 °F-days here — to size perimeter insulation, letting footings sit shallower than the frost line.

Weather stations used

NOAA weather stationDistance100-yr AFI
Miami, FL3 mi0
Hialeah, FL5 mi0
Miami 12 Ssw, FL7 mi0
Miami Beach, FL10 mi0

Nearby counties

Common questions

What is the frost line depth in Miami-Dade County?

About 0 inches in typical soil, based on NOAA's 100-year air freezing index. Across the county's ZIP codes the estimate runs from 0 to 0 inches.

How deep should footings be in Miami-Dade County, Florida?

Codes in climates like this commonly require 12 inches (code minimum). The Miami-Dade County building department publishes the required frost depth in its adopted code (IRC Table R301.2).

Does frost depth vary within Miami-Dade County?

Very little. Estimates across the county stay within 1 inches. Soil type matters more than location here.