diff --git a/docs/radio-tracker.md b/docs/radio-tracker.md
index 7719db8..9ef1865 100644
--- a/docs/radio-tracker.md
+++ b/docs/radio-tracker.md
@@ -21,3 +21,7 @@ Private (owner-only, 404 for everyone else) tracker for Opa Chiel's scanner hobb
 - Both read `~/.config/radio.env` (mode 600): `RADIO_NTFY_URL` (ntfy topic URL), optional
   `RADIO_NTFY_TOKEN`. Log: `~/.local/state/radio.log`.
 - `bun scripts/radio.ts upcoming` prints the next 24 h of reminders without sending.
+
+## Quiet hours
+
+Reminders whose send time (event minus 10 min) falls in 23:00-07:30 Europe/Amsterdam are skipped. Override with `RADIO_QUIET_HOURS=HH:MM-HH:MM` (or `off`) in `~/.config/radio.env`; the page shows the code default (`QUIET_HOURS` in `src/lib/radio/index.ts`). `bun scripts/radio.ts upcoming` marks skipped reminders as QUIET-SKIP.
diff --git a/scripts/radio.ts b/scripts/radio.ts
index 0e9af55..44aecc2 100644
--- a/scripts/radio.ts
+++ b/scripts/radio.ts
@@ -9,22 +9,30 @@
  *
  * Reminders go to RADIO_NTFY_URL (an ntfy topic URL, optional RADIO_NTFY_TOKEN), passed in with
  * `docker exec --env-file ~/.config/radio.env`. radio.reminders makes every reminder fire once.
+ * RADIO_QUIET_HOURS (default 23:00-07:30, "off" to disable) skips reminders sent in that window.
  */
 import postgres from 'postgres';
 import * as sat from 'satellite.js';
 import {
 	ISS_DOWNLINK_HZ,
 	ISS_MIN_EL,
+	QUIET_HOURS,
 	REMIND_MINUTES,
 	compass,
 	fmtTime,
 	formatFreq,
-	occurrences
+	inQuiet,
+	occurrences,
+	parseQuiet
 } from '../src/lib/radio/index';
 
 if (!process.env.DB_URL) throw new Error('DB_URL is required');
 const sql = postgres(process.env.DB_URL, { max: 2, onnotice: () => {} });
 const mode = process.argv[2] ?? 'remind';
+// Quiet hours (Amsterdam): reminders whose send time falls inside are skipped. "off" disables.
+const QUIET = parseQuiet(process.env.RADIO_QUIET_HOURS ?? QUIET_HOURS);
+const sendAt = (at: Date) => new Date(at.getTime() - REMIND_MINUTES * 60_000);
+const quiet = (at: Date) => inQuiet(sendAt(at), QUIET);
 const PAGE = 'https://stanrunge.dev/trackers/radio';
 
 // Gouda (approx), 0 m.
@@ -237,6 +245,7 @@ async function remind() {
 	const now = new Date();
 	const list = await due(now, new Date(now.getTime() + REMIND_MINUTES * 60_000));
 	for (const r of list) {
+		if (quiet(r.at)) continue;
 		const [claimed] = await sql`INSERT INTO radio.reminders (kind, ref_id, at)
 			VALUES (${r.kind}, ${r.refId}, ${r.at}) ON CONFLICT DO NOTHING RETURNING at`;
 		if (!claimed) continue;
@@ -255,8 +264,11 @@ try {
 	else if (mode === 'remind') await remind();
 	else if (mode === 'upcoming') {
 		const now = new Date();
+		console.log(`quiet hours: ${QUIET?.label ?? 'off'} (Europe/Amsterdam, by send time)`);
 		for (const r of await due(now, new Date(now.getTime() + 86_400_000)))
-			console.log(`${r.at.toISOString()} ${r.kind}: ${r.title} | ${r.message}`);
+			console.log(
+				`${quiet(r.at) ? 'QUIET-SKIP' : 'SEND      '} at ${fmtTime(sendAt(r.at))}  ${r.kind}: ${r.title}`
+			);
 	} else throw new Error(`unknown mode ${mode} (iss | remind | upcoming)`);
 } finally {
 	await sql.end();
diff --git a/src/lib/radio/IssPasses.svelte b/src/lib/radio/IssPasses.svelte
index 28fc25d..6974e9c 100644
--- a/src/lib/radio/IssPasses.svelte
+++ b/src/lib/radio/IssPasses.svelte
@@ -4,10 +4,13 @@
 	import {
 		ISS_DOWNLINK_HZ,
 		ISS_MIN_EL,
+		QUIET_HOURS,
+		REMIND_MINUTES,
 		compass,
 		dayKey,
 		fmtTime,
 		formatFreq,
+		parseQuiet,
 		relDay,
 		until
 	} from './index.js';
@@ -100,7 +103,8 @@
 	<p class="meta foot">
 		{tle.name} TLE from Celestrak, epoch {tle.epoch ? fmtAgo(tle.epoch) : '?'}, fetched {tle.fetchedAt
 			? fmtAgo(tle.fetchedAt)
-			: '?'} (refreshed daily).
+			: '?'} (refreshed daily). Passes of {ISS_MIN_EL}° and up get a reminder {REMIND_MINUTES} min before,
+		except during quiet hours ({parseQuiet(QUIET_HOURS)?.label}).
 	</p>
 {/if}
 
diff --git a/src/lib/radio/Nets.svelte b/src/lib/radio/Nets.svelte
index 3c8e3ea..19e30f8 100644
--- a/src/lib/radio/Nets.svelte
+++ b/src/lib/radio/Nets.svelte
@@ -12,7 +12,9 @@
 		BANDS,
 		BAND_LABEL,
 		DAY_SHORT,
+		QUIET_HOURS,
 		REMIND_MINUTES,
+		parseQuiet,
 		daysLabel,
 		fmtTime,
 		formatFreq,
@@ -118,7 +120,8 @@
 <section class="card">
 	<div class="bar">
 		<p class="meta">
-			Times are Amsterdam time. A bell sends an ntfy reminder {REMIND_MINUTES} minutes before each start.
+			Times are Amsterdam time. A bell sends an ntfy reminder {REMIND_MINUTES} minutes before each start,
+			except during quiet hours ({parseQuiet(QUIET_HOURS)?.label}).
 		</p>
 		<button
 			type="button"
diff --git a/src/lib/radio/index.test.ts b/src/lib/radio/index.test.ts
index 1b2b871..269cda2 100644
--- a/src/lib/radio/index.test.ts
+++ b/src/lib/radio/index.test.ts
@@ -1,5 +1,15 @@
 import { describe, expect, it } from 'vitest';
-import { alphaTag, bankOf, nextOccurrence, occurrences, parseFreq, scannerCsv } from './index';
+import {
+	alphaTag,
+	bankOf,
+	fromZoned,
+	inQuiet,
+	parseQuiet,
+	nextOccurrence,
+	occurrences,
+	parseFreq,
+	scannerCsv
+} from './index';
 
 describe('parseFreq', () => {
 	it('reads MHz, kHz and Hz', () => {
@@ -77,3 +87,17 @@ describe('scanner', () => {
 		).toBeLessThanOrEqual(16);
 	});
 });
+
+describe('quiet hours', () => {
+	const q = parseQuiet('23:00-07:30');
+	it('parses and wraps midnight (Amsterdam time)', () => {
+		expect(q?.label).toBe('23:00–07:30');
+		expect(parseQuiet('off')).toBeNull();
+		expect(inQuiet(fromZoned(2026, 10, 27, 2, 11), q)).toBe(true);
+		expect(inQuiet(fromZoned(2026, 10, 27, 7, 1), q)).toBe(true);
+		expect(inQuiet(fromZoned(2026, 10, 27, 7, 30), q)).toBe(false);
+		expect(inQuiet(fromZoned(2026, 10, 26, 18, 55), q)).toBe(false);
+		expect(inQuiet(fromZoned(2026, 10, 26, 23, 0), q)).toBe(true);
+		expect(inQuiet(fromZoned(2026, 10, 26, 18, 55), null)).toBe(false);
+	});
+});
diff --git a/src/lib/radio/index.ts b/src/lib/radio/index.ts
index de418d3..8f9e5e5 100644
--- a/src/lib/radio/index.ts
+++ b/src/lib/radio/index.ts
@@ -40,6 +40,20 @@ export const ALPHA_TAG_MAX = 16;
 export const ISS_MIN_EL = 10;
 export const REMIND_MINUTES = 10;
 export const ISS_DOWNLINK_HZ = 145_800_000;
+/** No reminders are sent when the send time falls in this Amsterdam window (RADIO_QUIET_HOURS overrides). */
+export const QUIET_HOURS = '23:00-07:30';
+export type Quiet = { from: number; to: number; label: string } | null;
+/** "23:00-07:30" -> minutes of day; "off" / "" -> null (no quiet hours). */
+export function parseQuiet(spec: string | null | undefined): Quiet {
+	const m = /^\s*(\d{1,2}):(\d{2})\s*[-–]\s*(\d{1,2}):(\d{2})\s*$/.exec(spec ?? '');
+	if (!m) return null;
+	const from = Number(m[1]) * 60 + Number(m[2]);
+	const to = Number(m[3]) * 60 + Number(m[4]);
+	if (from > 1440 || to > 1440 || from === to) return null;
+	const pad = (n: number) =>
+		`${String(Math.floor(n / 60)).padStart(2, '0')}:${String(n % 60).padStart(2, '0')}`;
+	return { from, to, label: `${pad(from)}–${pad(to)}` };
+}
 
 export const DAY_SHORT = ['mon', 'tue', 'wed', 'thu', 'fri', 'sat', 'sun'] as const;
 
@@ -312,3 +326,11 @@ export function alphaTag(name: string, marineCh?: string | null): string {
 	if (marineCh) s = `${marineCh} ${s}`;
 	return s.slice(0, ALPHA_TAG_MAX).trim();
 }
+
+/** Whether an instant falls in the quiet window (Amsterdam wall clock; the window may wrap midnight). */
+export function inQuiet(at: Date, quiet: Quiet): boolean {
+	if (!quiet) return false;
+	const z = zoned(at);
+	const t = z.h * 60 + z.min;
+	return quiet.from < quiet.to ? t >= quiet.from && t < quiet.to : t >= quiet.from || t < quiet.to;
+}