diff --git a/app/page.tsx b/app/page.tsx
index f0fa4dc..149d6ac 100644
--- a/app/page.tsx
+++ b/app/page.tsx
@@ -72,7 +72,7 @@ export default async function HomePage({ searchParams }: PageProps) {
     const openTodayParks = PARKS.filter((p) => {
       const dayData = data[p.id]?.[today];
       if (!dayData?.isOpen || !QUEUE_TIMES_IDS[p.id] || !dayData.hoursLabel) return false;
-      return isWithinOperatingWindow(dayData.hoursLabel);
+      return isWithinOperatingWindow(dayData.hoursLabel, p.timezone);
     });
     const results = await Promise.all(
       openTodayParks.map(async (p) => {
diff --git a/app/park/[id]/page.tsx b/app/park/[id]/page.tsx
index 15345a8..7588f43 100644
--- a/app/park/[id]/page.tsx
+++ b/app/park/[id]/page.tsx
@@ -56,7 +56,7 @@ export default async function ParkPage({ params, searchParams }: PageProps) {
 
   // Determine if we're within the 1h-before-open to 1h-after-close window.
   const withinWindow = todayData?.hoursLabel
-    ? isWithinOperatingWindow(todayData.hoursLabel)
+    ? isWithinOperatingWindow(todayData.hoursLabel, park.timezone)
     : false;
 
   if (queueTimesId) {
@@ -125,6 +125,7 @@ export default async function ParkPage({ params, searchParams }: PageProps) {
             month={month}
             monthData={monthData}
             today={today}
+            timezone={park.timezone}
           />
         </section>
 
diff --git a/components/ParkCard.tsx b/components/ParkCard.tsx
index b3e0fcf..eaa8f51 100644
--- a/components/ParkCard.tsx
+++ b/components/ParkCard.tsx
@@ -1,6 +1,7 @@
 import Link from "next/link";
 import type { Park } from "@/lib/scrapers/types";
 import type { DayData } from "@/lib/db";
+import { getTimezoneAbbr } from "@/lib/env";
 
 interface ParkCardProps {
   park: Park;
@@ -15,6 +16,7 @@ const DOW = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "
 
 export function ParkCard({ park, weekDates, parkData, today, openRideCount, coastersOnly }: ParkCardProps) {
   const openDays = weekDates.filter((d) => parkData[d]?.isOpen && parkData[d]?.hoursLabel);
+  const tzAbbr = getTimezoneAbbr(park.timezone);
   const isOpenToday = openDays.includes(today);
 
   return (
@@ -152,7 +154,7 @@ export function ParkCard({ park, weekDates, parkData, today, openRideCount, coas
                         ? "var(--color-today-text)"
                         : "var(--color-open-hours)",
                     }}>
-                      {dayData.hoursLabel}
+                      {dayData.hoursLabel} {tzAbbr}
                     </span>
                   </div>
                 </div>
diff --git a/components/ParkMonthCalendar.tsx b/components/ParkMonthCalendar.tsx
index 2185f11..49164b9 100644
--- a/components/ParkMonthCalendar.tsx
+++ b/components/ParkMonthCalendar.tsx
@@ -1,5 +1,6 @@
 import Link from "next/link";
 import type { DayData } from "@/lib/db";
+import { getTimezoneAbbr } from "@/lib/env";
 
 interface ParkMonthCalendarProps {
   parkId: string;
@@ -7,6 +8,7 @@ interface ParkMonthCalendarProps {
   month: number; // 1-indexed
   monthData: Record<string, DayData>; // 'YYYY-MM-DD' → DayData
   today: string; // YYYY-MM-DD
+  timezone: string; // IANA timezone, e.g. "America/New_York"
 }
 
 const DOW_LABELS = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"];
@@ -29,7 +31,8 @@ function daysInMonth(year: number, month: number): number {
   return new Date(year, month, 0).getDate();
 }
 
-export function ParkMonthCalendar({ parkId, year, month, monthData, today }: ParkMonthCalendarProps) {
+export function ParkMonthCalendar({ parkId, year, month, monthData, today, timezone }: ParkMonthCalendarProps) {
+  const tzAbbr = getTimezoneAbbr(timezone);
   const firstDow = new Date(year, month - 1, 1).getDay(); // 0=Sun
   const totalDays = daysInMonth(year, month);
 
@@ -184,7 +187,7 @@ export function ParkMonthCalendar({ parkId, year, month, monthData, today }: Par
                         Passholder
                       </div>
                       <div style={{ fontSize: "0.65rem", color: "var(--color-ph-hours)", marginTop: 2 }}>
-                        {dayData.hoursLabel}
+                        {dayData.hoursLabel} {tzAbbr}
                       </div>
                     </div>
                   ) : isOpen ? (
@@ -195,7 +198,7 @@ export function ParkMonthCalendar({ parkId, year, month, monthData, today }: Par
                       padding: "3px 6px",
                     }}>
                       <div style={{ fontSize: "0.65rem", color: "var(--color-open-hours)" }}>
-                        {dayData.hoursLabel}
+                        {dayData.hoursLabel} {tzAbbr}
                       </div>
                     </div>
                   ) : (
diff --git a/components/WeekCalendar.tsx b/components/WeekCalendar.tsx
index 678de2a..73ba085 100644
--- a/components/WeekCalendar.tsx
+++ b/components/WeekCalendar.tsx
@@ -3,7 +3,7 @@ import Link from "next/link";
 import type { Park } from "@/lib/scrapers/types";
 import type { DayData } from "@/lib/db";
 import type { Region } from "@/lib/parks";
-import { getTodayLocal } from "@/lib/env";
+import { getTodayLocal, getTimezoneAbbr } from "@/lib/env";
 
 interface WeekCalendarProps {
   parks: Park[];
@@ -33,9 +33,11 @@ function parseDate(iso: string) {
 function DayCell({
   dayData,
   isWeekend,
+  tzAbbr,
 }: {
   dayData: DayData | undefined;
   isWeekend: boolean;
+  tzAbbr: string;
 }) {
   const base: React.CSSProperties = {
     padding: 0,
@@ -98,7 +100,7 @@ function DayCell({
             letterSpacing: "-0.01em",
             whiteSpace: "nowrap",
           }}>
-            {dayData.hoursLabel}
+            {dayData.hoursLabel} {tzAbbr}
           </span>
         </div>
       </td>
@@ -126,7 +128,7 @@ function DayCell({
           letterSpacing: "-0.01em",
           whiteSpace: "nowrap",
         }}>
-          {dayData.hoursLabel}
+          {dayData.hoursLabel} {tzAbbr}
         </span>
       </div>
     </td>
@@ -177,6 +179,7 @@ function ParkRow({
   coastersOnly?: boolean;
 }) {
   const rowBg = parkIdx % 2 === 0 ? "var(--color-bg)" : "var(--color-surface)";
+  const tzAbbr = getTimezoneAbbr(park.timezone);
   return (
     <tr
       className="park-row"
@@ -237,6 +240,7 @@ function ParkRow({
           key={date}
           dayData={parkData[date]}
           isWeekend={parsedDates[i].isWeekend}
+          tzAbbr={tzAbbr}
         />
       ))}
     </tr>
diff --git a/lib/env.ts b/lib/env.ts
index 186c060..7c32382 100644
--- a/lib/env.ts
+++ b/lib/env.ts
@@ -35,11 +35,26 @@ export function getTodayLocal(): string {
 }
 
 /**
- * Returns true when the current local time is within 1 hour before open
- * or 1 hour after close, based on a hoursLabel like "10am – 6pm".
- * Falls back to true when the label can't be parsed.
+ * Returns the short timezone abbreviation for a given IANA timezone,
+ * e.g. "America/Los_Angeles" → "PDT" or "PST".
  */
-export function isWithinOperatingWindow(hoursLabel: string): boolean {
+export function getTimezoneAbbr(timezone: string): string {
+  const parts = new Intl.DateTimeFormat("en-US", {
+    timeZone: timezone,
+    timeZoneName: "short",
+  }).formatToParts(new Date());
+  return parts.find((p) => p.type === "timeZoneName")?.value ?? "";
+}
+
+/**
+ * Returns true when the current time in the park's timezone is within
+ * the operating window (open time through 1 hour after close), based on
+ * a hoursLabel like "10am – 6pm". Falls back to true when unparseable.
+ *
+ * Uses the park's IANA timezone so a Pacific park's "10am" is correctly
+ * compared to Pacific time regardless of where the server is running.
+ */
+export function isWithinOperatingWindow(hoursLabel: string, timezone: string): boolean {
   const m = hoursLabel.match(
     /^(\d+)(?::(\d+))?(am|pm)\s*[–-]\s*(\d+)(?::(\d+))?(am|pm)$/i
   );
@@ -53,7 +68,17 @@ export function isWithinOperatingWindow(hoursLabel: string): boolean {
   };
   const openMin  = toMinutes(m[1], m[2], m[3]);
   const closeMin = toMinutes(m[4], m[5], m[6]);
-  const now = new Date();
-  const nowMin = now.getHours() * 60 + now.getMinutes();
-  return nowMin >= openMin - 60 && nowMin <= closeMin + 60;
+
+  // Get the current time in the park's local timezone.
+  const parts = new Intl.DateTimeFormat("en-US", {
+    timeZone: timezone,
+    hour: "numeric",
+    minute: "2-digit",
+    hour12: false,
+  }).formatToParts(new Date());
+  const h   = parseInt(parts.find((p) => p.type === "hour")?.value   ?? "0", 10);
+  const min = parseInt(parts.find((p) => p.type === "minute")?.value ?? "0", 10);
+  const nowMin = (h % 24) * 60 + min;
+
+  return nowMin >= openMin && nowMin <= closeMin + 60;
 }