The legally enforced design wind speed inside Miami-Dade is 175 mph at Risk Category II per Florida Building Code R301.2(7) — and the whole county sits inside the High Velocity Hurricane Zone.
Inside Miami-Dade the controlling basic wind speed for ordinary buildings is 175 mph at Risk Category II. It is written into Florida Building Code R301.2(7) as a county-wide minimum.
That number is a direct legacy of the post-Hurricane Andrew code rewrite. It has carried forward through every FBC edition, including the current 8th Edition adopting ASCE 7-22 with Florida amendments.
Interpolate off the ASCE 7-22 Figure 26.5-1B contour map alone and most of Miami-Dade lands in the 169–170 mph band — close to, but below, the enforceable code value.
Miami-Dade plan reviewers check submittals against the FBC R301.2(7) minimum, not the ASCE contour. Designing to 170 mph here is under-strength, and the permit will not pass review.
The county-wide override spans all four risk categories: 165 mph for Cat I, 175 for Cat II, 186 for Cat III, and 195 for Cat IV.
Pre-filled to Miami (33130). Edit the ZIP or risk category and the result updates live, citing whether the value comes from the FBC override or the ASCE 7-22 map.
Every ZIP inside the county boundary inherits the same 175 mph Risk Category II value, because the FBC override is county-wide. Exposure Category and surge zone still differ block by block.
| City | Primary ZIP | Wind Speed (Cat II) | Coastal / Inland | Reference |
|---|---|---|---|---|
| Miami | 33130 | 175 mph | Coastal | FBC R301.2(7) |
| Hialeah | 33010 | 175 mph | Inland | FBC R301.2(7) |
| Homestead | 33030 | 175 mph | Coastal | FBC R301.2(7) |
| Coral Gables | 33134 | 175 mph | Coastal | FBC R301.2(7) |
| Doral | 33172 | 175 mph | Inland | FBC R301.2(7) |
| Kendall | 33186 | 175 mph | Inland | FBC R301.2(7) |
| Aventura | 33180 | 175 mph | Coastal | FBC R301.2(7) |
| Miami Beach | 33139 | 175 mph | Coastal | FBC R301.2(7) |
| Key Biscayne | 33149 | 175 mph | Coastal (Exp D) | FBC R301.2(7) |
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Miami-Dade is the most building-code-shaping county in U.S. history. Three storms in three decades drove most of the modern wind-load thinking now in the Florida Building Code.
Landfall near Homestead with sustained 165 mph winds and gusts above 200 mph. Roughly 25,000 homes were destroyed and 100,000 damaged. Forensic studies found debris breaking openings, then internal pressurization — the failure mode that created the HVHZ regime.
A long-track storm that struck the Lower Keys at Cat 4, then Marco Island at Cat 3. Miami-Dade sat on the eastern eyewall for hours. HVHZ-compliant stock performed as designed; older pre-1994 housing took most of the damage.
Wilma crossed Florida west-to-east, landfalling near Cape Romano as a Cat 3 and exiting through Miami-Dade and Broward as a strong Cat 2. It exposed weaknesses in older roof-deck attachment, soffit detailing, and screen enclosures.
Only two Florida counties carry the HVHZ designation: Miami-Dade and Broward. Nowhere else is HVHZ, regardless of local wind speed — a frequent source of confusion.
Inside the HVHZ, every exterior product that resists wind pressure or wind-borne debris must carry a Miami-Dade Notice of Acceptance (NOA) from the County Product Control Section.
A statewide Florida Product Approval (FL#) alone does not satisfy the HVHZ. The NOA is the controlling document. NOAs are granted only after products pass the Testing Application Standards developed after Andrew:
A 9-pound 2×4 timber projectile fired at 50 ft/s at the product, simulating roof tile and structural debris launched by hurricane winds.
Forced-entry and structural air-pressure testing that validates the product's resistance to peak design pressures.
Thousands of positive-and-negative pressure cycles simulating the hours-long oscillating loading of a hurricane eyewall passage.
Florida Building Code R301.2(7) legally supersedes the ASCE 7-22 Figure 26.5-1B basic wind speed contour map inside Miami-Dade County.
After Hurricane Andrew (1992) the code set a county-wide minimum of 175 mph for Risk Category II, higher than the 169–170 mph an engineer would interpolate off the national ASCE map.
Plan reviewers check the FBC number, not the ASCE map, so designing to 170 mph is under-strength and will not pass review.
HVHZ stands for High Velocity Hurricane Zone, a Florida Building Code designation applied to only two counties: Miami-Dade and Broward.
Inside the HVHZ every exterior product that resists wind pressure — windows, doors, garage doors, roofing, soffit, shutters — must carry a Miami-Dade Notice of Acceptance (NOA) and pass Testing Application Standards TAS 201, 202, and 203.
Yes. ZIP 33030 is Homestead, inside Miami-Dade and therefore inside the HVHZ. Every exterior opening-protection product on a Homestead permit must carry a current Miami-Dade NOA.
A statewide Florida Product Approval (FL#) alone is not sufficient inside the HVHZ — the NOA is the controlling document. This is stricter than any Florida county outside Broward.
Risk Category III in Miami-Dade is 186 mph per Florida Building Code R301.2(7). Category III covers schools above 250 capacity, jails, assembly buildings over 300 occupants, and healthcare facilities with surgery but no emergency care.
Risk Category IV essential facilities — hospitals with emergency departments, fire and police stations, emergency operations centers — require 195 mph.
Yes. The Village of Key Biscayne is an incorporated municipality inside Miami-Dade County. ZIP 33149 falls entirely within Miami-Dade and is subject to the 175 mph Risk Category II requirement and the full HVHZ product-approval regime.
Because Key Biscayne is a barrier island fully exposed to Atlantic and Biscayne Bay fetch, most sites are Exposure Category D, further increasing velocity pressure.
Calculating wind loads since 2002, online since 2006. Take the Miami-Dade minimum into a full pressure analysis with a permit-ready Engineering Report — PE sign-and-seal available in all 50 states. Or start with the free wind speed lookup.