SkyReady

Lopez Island frequencies

Lopez Island (S31) in Lopez, WA has no control tower, so nobody is sequencing traffic here — you announce your own position on 128.25. Every frequency below is in the order you tune it. · Open on the map

All of Lopez Island — runways, frequencies, charts and live weather

Before taxi

ASOS/AWOS 118.525
An automated weather station reading the field conditions aloud — wind, visibility, ceiling, temperature and altimeter. It replaces ATIS at a field with no controller to record one. Get the altimeter setting before you descend below the transition altitude.

Taxi & takeoff

CTAF 128.25
The common frequency pilots use to announce themselves to each other at a field with no operating control tower. Nobody is controlling traffic — you are self announcing. Report your position and intentions on entry and on each leg of the pattern, and listen well before you transmit.

What to say on 128.25

Nobody is sequencing traffic at S31, so every call is you telling other aircraft where you are. Open and close with the field name so a pilot tuned to a shared frequency knows which airport you mean — 128.25 is not unique to Lopez Island.

  • Inbound, 10 miles out Lopez Island traffic, Skyhawk one two three four five, one zero miles south, inbound landing runway 16, Lopez Island.
  • Entering the pattern Lopez Island traffic, Skyhawk one two three four five, entering left downwind runway 16, Lopez Island.
  • Before taking the runway Lopez Island traffic, Skyhawk one two three four five, departing runway 16, Lopez Island.

Pattern direction is not always left here — check the S31 traffic pattern before you announce a leg. The Chart Supplement is authoritative if S31 publishes a call name that differs from the airport's. Full guidance →

Every S31 frequency, as one table
ASOS/AWOS118.525
CTAF128.25

Frequently asked

What is the CTAF at S31?

Lopez Island is non towered. The common traffic advisory frequency is 128.25 — announce your position and intentions on entry and on each leg of the pattern.

What is the ASOS/AWOS frequency at S31?

ASOS/AWOS at Lopez Island is 118.525. It is an automated broadcast, so there is no letter to report — just take the altimeter setting and wind.

More about S31

Frequencies from FAA NASR. For planning and education only; always verify against official sources.

Something here wrong or out of date? Report a data problem.