What grid square is Boston?

FN40 is the live DXRadar reference square for Boston. The exact portable or home QTH may vary within the square, but this page tracks the center of FN40 for planning propagation.

How do I find my grid square?

Use a Maidenhead grid lookup from your GPS coordinates or street address, then compare that grid with the nearby squares linked on this page. A 4-character grid is enough for most HF planning.

What bands are open in FN40 right now?

FN40 is currently rated POOR. The best bands right now are 10m, 20m, 30m, 40m, 60m, with 10m as the main band to watch first.

Grid FN40 Band Conditions — Boston

Localized HF conditions for Maidenhead locator FN40. Coordinating at 40.50°, -71.00°. Updated with real-time telemetry from NOAA and DX cluster reports.

FN40 conditions are POOR. Best bands: 10m, 20m, 30m, 40m, 60m. SFI: 104.

Regional Radar

SFI

104

K-Index

0 Kp

Center Coords

40.5, -71.0

Local Phase

Night

Grayline window

Sunrise 10:31 UTC

Sunset 22:45 UTC from FN40

From Boston, work the 10:31 UTC and 22:45 UTC grayline windows: probe 20m, 30m, and 40m in the 15 minutes either side while the terminator crosses FN40.

Best band now

10m

After sunset, 20m transitions and 40m becomes the reliable DX fallback from this part of North America.

Closest operating hub

Boston

This square sits in USA footprint and is best used as a planning center for portable, field-day, and home-station band decisions.

Latitude zone: mid-latitude
Local phase: Darkness
Aurora exposure: low at this latitude
Grayline: 10:31 UTC / 22:45 UTC
Best high band: 10m
Nearest city: Boston

● Local Band Quality Scorings

Use this local score for FN40, then compare the global live ranking oncurrent ham band conditionsbefore changing bands.

10m

POOR

15m

POOR

20m

FAIR

40m

EXCELLENT

80m

EXCELLENT

● Best DX Windows from FN40 — Boston

Great-circle distance, short-path beam heading, the bands most likely open right now from FN40 to each DX region at SFI 104 / Kp 0, and a current verdict. "Open now" means a suitable band is scoring well on that path; "Try ~HH:MM" points at the next far-end grayline. Band picks and status are a planning heuristic, not a measurement.

Target	Distance	Beam	Bands to try	Status
North America	1,432 mi	275°	40m, 80m, 20m	Open now
Europe	3,798 mi	51°	40m, 20m, 80m	Open now
South America	3,924 mi	165°	40m, 20m, 80m	Open now
East Asia / Japan	6,840 mi	337°	10m, 15m, 20m	Open now
South Asia	7,681 mi	31°	40m, 20m, 80m	Open now
Southern Africa	7,710 mi	106°	40m, 20m, 80m	Open now
Oceania	10,036 mi	274°	10m, 15m, 20m	Open now

● Band-by-Time Plan for FN40

A planning heuristic for the local day at FN40, built from sunrise 10:31 UTC, sunset 22:45 UTC, SFI 104, and Kp 0. Not a measurement — a starting point for where to listen as the day turns.

Dawn grayline

around 10:31 UTC

40m · 30m · 20m

Grayline enhancement — low bands reach long distances as the terminator passes.

Morning

after 10:31 UTC

20m · 15m

Modest SFI — 20m is the daytime workhorse here.

Midday

local noon

15m · 20m

20m and 15m carry the daytime load at this SFI.

Dusk grayline

around 22:45 UTC

20m · 40m

Second grayline peak — 20m holds, then hands off to 40m.

Night

after 22:45 UTC

40m · 80m

Low bands own the darkness — 40m for DX, 80m regional.

Recent local activity

Spots touching FN40 and the adjacent squares

These are the newest 10m, 15m, and 20m reports where one side of the path sits in FN40, FN41, FM49, FN50, FN30. This gives the page unique, local context instead of a generic solar snapshot.

No fresh PSKReporter paths are cached for the immediate FN40 footprint right now. That usually means you should widen the search to the nearest regional hubs below or fall back to 20m/40m for the next operating window.

Top DX targets

Where this grid is reaching right now

No outbound targets were strong enough to rank from the current cache. Check back after the next PSKReporter refresh or switch to the regional grids below.

Contest preview

Next major contest outlook

CQ World Wide DX Contest - SSB starts Sat, 24 Oct 2026 00:00:00 GMT. Current forecast from FN40: 10m POOR, 15m POOR, 20m FAIR. Current solar conditions (SFI 104, K 0) favor 10m, 15m, 20m for this contest weekend.

Open contest calendar

Nearby grids