Frostline.info

Frost line depth in Pinellas County, Florida

Frost reaches about 0 inches in typical soil across Pinellas 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
47
#61 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 Pinellas County building or permitting office in Florida and call 811 before digging.

Frost depth by ZIP code in Pinellas County

ZIPCityEst. frostCode range
33701Saint Petersburg0″12″ minimum
33702Saint Petersburg0″12″ minimum
33703Saint Petersburg0″12″ minimum
33704Saint Petersburg0″12″ minimum
33705Saint Petersburg0″12″ minimum
33706Saint Petersburg0″12″ minimum
33707Saint Petersburg0″12″ minimum
33708Saint Petersburg0″12″ minimum
33709Saint Petersburg0″12″ minimum
33710Saint Petersburg0″12″ minimum
33711Saint Petersburg0″12″ minimum
33712Saint Petersburg0″12″ minimum
33713Saint Petersburg0″12″ minimum
33714Saint Petersburg0″12″ minimum
33715Saint Petersburg0″12″ minimum
33716Saint Petersburg0″12″ minimum
33730Saint Petersburg0″12″ minimum
33755Clearwater0″12″ minimum
33756Clearwater0″12″ minimum
33759Clearwater0″12″ minimum
33760Clearwater0″12″ minimum
33761Clearwater0″12″ minimum
33762Clearwater0″12″ minimum
33763Clearwater0″12″ minimum
33764Clearwater0″12″ minimum
33765Clearwater0″12″ minimum
33767Clearwater Beach0″12″ minimum
33770Largo0″12″ minimum
33771Largo0″12″ minimum
33772Seminole0″12″ minimum
33773Largo0″12″ minimum
33774Largo0″12″ minimum
33776Seminole0″12″ minimum
33777Seminole0″12″ minimum
33778Largo0″12″ minimum
33781Pinellas Park0″12″ minimum
33782Pinellas Park0″12″ minimum
33785Indian Rocks Beach0″12″ minimum
33786Belleair Beach0″12″ minimum
34677Oldsmar0″12″ minimum
34683Palm Harbor0″12″ minimum
34684Palm Harbor0″12″ minimum
34685Palm Harbor0″12″ minimum
34688Tarpon Springs0″12″ minimum
34689Tarpon Springs0″12″ minimum
34695Safety Harbor0″12″ minimum
34698Dunedin0″12″ minimum

What this means for your project in Pinellas 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
St Petersburg, FL11 mi0
Tampa, FL13 mi0
Tarpon Spgs Sewage Pl, FL18 mi0
Bradenton 5 Ese, FL35 mi0

Nearby counties

Common questions

What is the frost line depth in Pinellas 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 Pinellas County, Florida?

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

Does frost depth vary within Pinellas County?

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