What is Wind Zone I for manufactured homes?

Wind Zone I is the baseline, requiring resistance to 70 mph winds. It covers most inland U.S. areas away from hurricanes.

How do I find my area's wind zone?

Use the HUD basic wind zone map (embedded on this page), check county lists in HUD regs, or consult local permitting offices. Your home's data plate also shows the designed zone.

Can a manufactured home built for Wind Zone I be installed in Wind Zone II?

No — it violates HUD Code. Always match or exceed the site's requirements.

What wind speed is Wind Zone III?

110 mph fastest-mile, for the most hurricane-prone coastal regions.

What is the difference between Wind Zone I, II, and III in terms of wind speeds?

Wind Zone I: Designed for up to 70 mph fastest-mile winds (baseline for most inland U.S. areas). Wind Zone II: Up to 100 mph (coastal/high-risk areas like parts of the Gulf/Atlantic coasts). Wind Zone III: Up to 110 mph (highest-risk hurricane zones, e.g., southern Florida, Hawaii, certain coastal parishes/counties). These are "fastest-mile" speeds per older ASCE standards; equivalent modern 3-second gusts are roughly 108 mph (Zone I), 150 mph (Zone II), and 163 mph (Zone III) with safety factors.

How do I determine the wind zone for my specific county or address?

Refer to the HUD Basic Wind Zone Map (embedded on this page), or check the official HUD regulations in 24 CFR 3280.305(c) which list counties in Zones II and III (all others default to Zone I). Contact your local county permitting office or building department for confirmation, as boundaries can vary slightly by location. HUD provides resources and maps online for verification.

Can I install a manufactured home in a higher wind zone than it was built for?

No. A home built for Wind Zone I cannot be installed in Zone II or III areas—it violates HUD Code and local installation standards. However, homes built to Zone II or III can be installed in lower zones (e.g., a Zone III home in Zone I). Always check the home's data plate and consult local authorities before moving or installing.

Where is the wind zone listed on a manufactured home?

The wind zone is printed on the home's HUD data plate (inside a kitchen cabinet, bedroom closet, electrical panel, or utility area) and may also appear on the exterior HUD certification label (red metal tag). This includes the designed wind zone, date of manufacture, and other specs. All HUD-code homes built since 1976 have this.

Do anchoring requirements change by wind zone?

Yes. Zone I typically requires basic diagonal frame ties/anchors for horizontal resistance. Zones II and III need additional vertical ties and stronger systems to resist uplift from higher winds. Oliver Technologies' All Steel Foundation Systems (ASFS) can eliminate or reduce traditional anchors in Zone I and simplify requirements in Zones II/III—contact us at 1-800-284-7437 for compliant solutions.

What happens if a manufactured home is not compliant with its installation site's wind zone?

It may fail permitting/inspection, void warranties, create safety risks during storms, or lead to insurance issues. Non-compliance can result in costly relocation, upgrades, or removal. Always verify the home's data plate matches or exceeds the site's zone before purchase or setup.

How have wind zone standards evolved over time?

Wind zones were introduced in 1976 under the HUD Code, with major updates in 1994 (post-Hurricane Andrew) for stricter construction in coastal areas. Anchoring rules were enhanced in 2008. While based on older "fastest-mile" metrics, they include safety factors for real-world protection.

Federal Wind Zone Standards

USA Wind Zone I, II & III Map

The HUD manufactured-home standards at 24 CFR § 3280.305 establish federal wind-load requirements for manufactured homes. The required wind zone depends on the home’s installation location and must be verified before setup.

This map is a general reference only. Always confirm the home’s HUD data plate, exact installation location, current federal/state/local requirements, and the authority having jurisdiction before selecting products or installing a home.

Oliver Technologies, Inc.

HUD Code · 24 CFR § 3280.305 · Wind Zone Reference Map

Manufactured Home
Construction Standard HUD CODE
§ 3280.305(c)(1–2)
24 CFR PART 3280

Wind Zone I

70 MPH

Fastest-Mile · Inland Baseline

Wind Zone II

100 MPH

Fastest-Mile · Coastal/High-Risk

Wind Zone III

110 MPH

Fastest-Mile · Hurricane Zone

HUD WIND ZONE REFERENCE · 24 CFR § 3280.305

USA HUD Wind Zone reference map showing Wind Zones I, II, and III for manufactured homes under 24 CFR section 3280.305. Verify exact zone boundaries before installation.

VERIFY EXACT WIND ZONE WITH THE HOME DATA PLATE AND AUTHORITY HAVING JURISDICTION

Wind Zone Legend

I

Zone I

70 MPH · Inland

Most inland areas

II

Zone II

100 MPH · Coastal

Gulf & Atlantic coasts

III

Zone III

110 MPH · Hurricane

S. Florida · Hawaii

◎

Use as a general reference only.
Verify before installation.

Pick by Zone

What you need by Wind Zone.

General product-selection guide by HUD Wind Zone. Confirm final product selection against the home data plate, RAD-1371 where applicable, current Oliver installation instructions, the home manufacturer’s instructions, and applicable state/local requirements.

Wind Zone I 70 mph

Inland counties. Baseline anchoring requirements.

All-Steel Foundation Systems Can reduce or replace selected anchoring components in listed HUD Wind Zone I applications when installed as instructed ABS Pier Pads Square, oval, and multi-pad configurations for load distribution Barbed Drive Anchors Anchor options for selected diagonal frame-tie applications
Wind Zone II 100 mph

Coastal Gulf and Atlantic counties. Enhanced uplift resistance.

All-Steel Foundation Systems Can replace selected diagonal frame ties, stabilizer plates, and longitudinal anchors in listed HUD Wind Zone II and III applications when installed as instructed Rock & Earth Auger Anchors Anchor options for selected soil and rock conditions Tie-Down Connectors & Straps Connector and strap options for selected HUD-code installations
Wind Zone III 110 mph

Hurricane-prone counties: southern Florida, all Hawaii. Highest HUD anchoring requirements.

All-Steel Foundation Systems Listed under RAD-1371 for specified HUD Wind Zone I–III applications when installed as instructed Rock & Earth Auger Anchors Anchor options for selected soil and rock conditions Concrete Anchors Anchor options for selected slab and concrete applications