diff --git a/apps/frontend/src/hook/quizZone/useQuizZone.tsx b/apps/frontend/src/hook/quizZone/useQuizZone.tsx
index cb75cfabc..770f0075f 100644
--- a/apps/frontend/src/hook/quizZone/useQuizZone.tsx
+++ b/apps/frontend/src/hook/quizZone/useQuizZone.tsx
@@ -215,7 +215,11 @@ export const chatMessagesReducer: Reducer<ChatMessage[], chatAction> = (chatMess
  * @returns {Function} .playQuiz - 퀴즈 상태를 플레이 모드로 변경하는 함수
  */
 
-const useQuizZone = (quizZoneId: string, handleReconnect?: () => void) => {
+const useQuizZone = (
+    quizZoneId: string,
+    handleReconnect?: () => void,
+    handleClose?: () => void,
+) => {
     const initialQuizZoneState: QuizZone = {
         stage: 'LOBBY',
         currentPlayer: {
@@ -249,6 +253,7 @@ const useQuizZone = (quizZoneId: string, handleReconnect?: () => void) => {
 
     const handleFinish = () => {
         dispatch({ type: 'leave', payload: undefined });
+        handleClose?.();
     };
 
     const wsUrl = `${import.meta.env.VITE_WS_URL}/play`;
diff --git a/apps/frontend/src/hook/useTimer.ts b/apps/frontend/src/hook/useTimer.ts
index 13ba22dd7..3b0c41880 100644
--- a/apps/frontend/src/hook/useTimer.ts
+++ b/apps/frontend/src/hook/useTimer.ts
@@ -1,4 +1,5 @@
-import { useState, useEffect, useCallback } from 'react';
+import { useCallback, useEffect, useRef, useState } from 'react';
+import TimerWorker from '@/workers/timer.worker?worker';
 
 interface TimerConfig {
     initialTime: number;
@@ -7,67 +8,85 @@ interface TimerConfig {
 }
 
 /**
- * 카운트다운 타이머를 관리하는 커스텀 훅입니다.
- *
- * @description
- * 이 훅은 시작 제어 기능을 갖춘 카운트다운 타이머 기능을 제공합니다.
- * 초기 시간과 타이머 완료 시 실행될 선택적 콜백을 받습니다.
- *
- * @example
- * ```typescript
- * const { time, start } = useTimer({
- *   initialTime: 60,
- *   onComplete: () => console.log('타이머 완료!'),
- * });
- *
- * // 타이머 시작
- * start();
- * ```
+ * Web Worker를 활용한 정확한 카운트다운 타이머 커스텀 훅
  *
  * @param {TimerConfig} config - 타이머 설정 객체
- * @param {number} config.initialTime - 카운트다운 초기 시간(초 단위)
- * @param {() => void} [config.onComplete] - 타이머 완료 시 실행될 선택적 콜백
- *
- * @returns {object} 현재 시간과 시작 함수를 포함하는 객체
- * @returns {number} returns.time - 카운트다운의 현재 시간
- * @returns {() => void} returns.start - 타이머를 시작하는 함수
+ * @returns {object} 타이머 상태와 컨트롤 함수들
  */
-
 export const useTimer = ({ initialTime, onComplete }: TimerConfig) => {
     const [time, setTime] = useState(initialTime);
     const [isRunning, setIsRunning] = useState(false);
+    const workerRef = useRef<Worker | null>(null);
 
     useEffect(() => {
-        let timer: NodeJS.Timeout | null = null;
-
-        if (isRunning) {
-            timer = setInterval(() => {
-                setTime((prev) => {
-                    const nextTime = prev - 0.1;
-                    if (nextTime <= 0) {
-                        setIsRunning(false);
-                        onComplete?.();
-                        return 0;
-                    }
-                    return nextTime;
-                });
-            }, 100);
+        // Worker가 이미 존재하면 종료
+        if (workerRef.current) {
+            workerRef.current.terminate();
         }
 
-        return () => {
-            if (timer) {
-                clearInterval(timer);
+        // 새 Worker 생성
+        workerRef.current = new TimerWorker();
+
+        // Worker 메시지 핸들러
+        workerRef.current.onmessage = (event) => {
+            const { type, payload } = event.data;
+            // console.log('Received from worker:', type, payload); // 디버깅용
+
+            switch (type) {
+                case 'TICK':
+                    setTime(payload.time);
+                    break;
+                case 'COMPLETE':
+                    setTime(0);
+                    setIsRunning(false);
+                    onComplete?.();
+                    break;
             }
         };
-    }, [isRunning, onComplete]);
 
+        // Clean up
+        return () => {
+            workerRef.current?.terminate();
+        };
+    }, []);
+
+    // 타이머 시작
     const start = useCallback(() => {
-        if (isRunning) return;
+        if (isRunning || !workerRef.current) return;
+
+        workerRef.current.postMessage({
+            type: 'START',
+            payload: {
+                duration: initialTime,
+                serverTime: Date.now(),
+            },
+        });
+
         setIsRunning(true);
+    }, [isRunning, initialTime]);
+
+    // 타이머 정지
+    const stop = useCallback(() => {
+        if (!isRunning || !workerRef.current) return;
+
+        workerRef.current.postMessage({ type: 'STOP' });
+        setIsRunning(false);
     }, [isRunning]);
 
+    // 타이머 리셋
+    const reset = useCallback(() => {
+        if (!workerRef.current) return;
+
+        workerRef.current.postMessage({ type: 'RESET' });
+        setTime(initialTime);
+        setIsRunning(false);
+    }, [initialTime]);
+
     return {
         time,
+        isRunning,
         start,
+        stop,
+        reset,
     };
 };
diff --git a/apps/frontend/src/pages/QuizZonePage.tsx b/apps/frontend/src/pages/QuizZonePage.tsx
index cdd673b73..edbc3c384 100644
--- a/apps/frontend/src/pages/QuizZonePage.tsx
+++ b/apps/frontend/src/pages/QuizZonePage.tsx
@@ -15,6 +15,7 @@ import CustomAlertDialogContent from '@/components/common/CustomAlertDialogConte
 const QuizZoneContent = () => {
     const [isLoading, setIsLoading] = useState(true);
     const [isDisconnection, setIsDisconnection] = useState(false);
+    const [isClose, setIsClose] = useState(false);
 
     const navigate = useNavigate();
     const { quizZoneId } = useParams();
@@ -29,8 +30,12 @@ const QuizZoneContent = () => {
         setIsDisconnection(true);
     };
 
+    const closeHandler = () => {
+        setIsClose(true);
+    };
+
     const { initQuizZoneData, quizZoneState, submitQuiz, startQuiz, playQuiz, exitQuiz, sendChat } =
-        useQuizZone(quizZoneId, reconnectHandler);
+        useQuizZone(quizZoneId, reconnectHandler, closeHandler);
 
     const initQuizZone = async () => {
         try {
@@ -127,6 +132,17 @@ const QuizZoneContent = () => {
                     handleConfirm={() => initQuizZone()}
                 />
             </AlertDialog>
+            <AlertDialog open={isClose}>
+                <CustomAlertDialogContent
+                    title={'퀴즈존 종료'}
+                    description={'방장이 퀴즈존을 떠나 퀴즈존이 삭제되었습니다.'}
+                    type={'info'}
+                    cancelText={'취소'}
+                    handleCancel={() => setIsClose(false)}
+                    confirmText={'나가기'}
+                    handleConfirm={() => navigate('/')}
+                />
+            </AlertDialog>
         </div>
     );
 };