What flag size should I fly on a 25 foot flagpole?

A 25 foot flagpole pairs best with a 4×6 ft or 5×8 ft American flag. The flag should be roughly one quarter to one third the height of the pole for proper visual proportions.

How do I find my US wind zone?

US wind zones range from Zone 1 (0–90 mph, most inland areas) to Zone 5 (131–170 mph, coastal Florida and the Gulf Coast). Match your zone to the recommended pole wall thickness and flag material — heavier-gauge aluminum and 2-ply polyester for higher zones.

Nylon or polyester flag — which is better for high wind?

Polyester flags are heavier and more durable in sustained high winds (Zones 3–5). Nylon flags are lighter, fly in light breeze, and are ideal for low to moderate wind areas (Zones 1–2).

Flag Size & Wind Guide

Choose the right flag size for your flagpole and the right materials for your wind zone.

Updated April 16, 2026

Flag Size Chart

Recommended flag sizes by flagpole height

Pole Height	Residential Flag	Commercial Flag	Max Flag Width
15 ft	2.5 x 4	3 x 5	4 ft
20 ft	4 x 6	4 x 6	6 ft
25 ft	4 x 6	5 x 8	8 ft
30 ft	5 x 8	5 x 8	8 ft
35 ft	N/A	6 x 10	12 ft
40 ft	N/A	8 x 12	15 ft
50 ft	N/A	10 x 15	18 ft
60 ft	N/A	12 x 18	25 ft
70 ft	N/A	15 x 25	30 ft
80 ft	N/A	20 x 30	30 ft

Pro Tip: A flag that's too large for your pole creates excessive wind load and shortens the life of both the flag and the pole. When in doubt, size down.

Residential Aluminum Flagpole Wind Speed Ratings

Bar chart comparing unflagged and nylon-flagged wind speed ratings for residential aluminum flagpoles from 20 to 30 feet

Specs shown as Height × Butt Diameter × Wall Thickness. Flagged ratings assume a nylon flag at the recommended size.

US Wind Ratings Map

Know your wind zone to choose the right flag material and pole gauge

United States wind zone map showing five wind speed zones from 0-90 mph up to 131-170 mph for flagpole selection

Wind Zones

Zone 1: 0–90 mph

Zone 2: 91–100 mph

Zone 3: 101–110 mph

Zone 4: 111–130 mph

Zone 5: 131–170 mph

Wind Zone Reference

Zone 1(0–90 mph)

Low wind — most inland areas. Standard nylon flags and standard-gauge poles work well.

Zone 2(91–100 mph)

Moderate wind — plains and some coastal areas. Consider heavy-duty nylon or polyester flags.

Zone 3(101–110 mph)

High wind — Great Plains, mountain passes. Use polyester flags and heavier-gauge poles.

Zone 4(111–130 mph)

Very high wind — hurricane-prone coasts. Heavy-duty polyester flags and commercial-grade poles recommended.

Zone 5(131–170 mph)

Extreme wind — coastal Florida, Gulf Coast. Use storm-rated poles and always have a plan to lower flags before severe weather.

Important: Wind zones are based on ASCE 7 design wind speed maps. Local conditions like elevation, terrain, and nearby structures can affect actual wind loads. Always consult local building codes for permanent installations.