diff --git a/scrapers/cpex-scraper/src/index.ts b/scrapers/cpex-scraper/src/index.ts
index 71e8f5a50a..760b2e9d07 100644
--- a/scrapers/cpex-scraper/src/index.ts
+++ b/scrapers/cpex-scraper/src/index.ts
@@ -1,6 +1,7 @@
 import fs from 'node:fs';
 import path from 'node:path';
 
+import { createFileLogger } from './logger';
 import { scrapeCPEx, type ScraperEnv } from './scraper';
 
 const ACADEMIC_YEAR = '2026/27';
@@ -12,10 +13,17 @@ const threshold = 1500;
 const envPath = path.join(__dirname, '../../env.json');
 const env = JSON.parse(fs.readFileSync(envPath, 'utf8')) as ScraperEnv;
 
+const logger = createFileLogger();
+
 scrapeCPEx({
   academicYear: ACADEMIC_YEAR,
   env,
+  logger,
   threshold,
-}).catch((error) => {
-  console.error(`Failed to scrape: ${error}`);
+}).then(async () => {
+  await logger.close();
+}).catch(async (error) => {
+  logger.log(`Failed to scrape: ${error}`);
+  await logger.close();
+  process.exitCode = 1;
 });
diff --git a/scrapers/cpex-scraper/src/logger.ts b/scrapers/cpex-scraper/src/logger.ts
new file mode 100644
index 0000000000..fe340ae242
--- /dev/null
+++ b/scrapers/cpex-scraper/src/logger.ts
@@ -0,0 +1,67 @@
+import fs from 'node:fs';
+import path from 'node:path';
+
+// At runtime, __dirname is build/src/ (compiled from src/).
+// Two levels up reaches the scraper root: build/src/ -> build/ -> scrapers/cpex-scraper/
+const LOG_DIR = path.join(__dirname, '../../logs');
+
+function pad2(n: number): string {
+  return n < 10 ? `0${n}` : String(n);
+}
+
+function formatTimestamp(date: Date): string {
+  return (
+    date.getFullYear().toString() +
+    '-' +
+    pad2(date.getMonth() + 1) +
+    '-' +
+    pad2(date.getDate()) +
+    '.' +
+    pad2(date.getHours()) +
+    '-' +
+    pad2(date.getMinutes()) +
+    '-' +
+    pad2(date.getSeconds())
+  );
+}
+
+export type FileLogger = Pick<Console, 'log'> & {
+  close: () => Promise<void>;
+};
+
+/**
+ * Creates a logger that writes timestamped lines to both stdout and a log file.
+ * The log file is written to `scrapers/cpex-scraper/logs/cpex-YYYY-MM-DD.HH-mm-ss.log`.
+ *
+ * Satisfies the `Pick<Console, 'log'>` interface used by the CPEx scraper.
+ */
+export function createFileLogger(now: Date = new Date()): FileLogger {
+  if (!fs.existsSync(LOG_DIR)) {
+    fs.mkdirSync(LOG_DIR, { recursive: true });
+  }
+
+  const filename = `cpex-${formatTimestamp(now)}.log`;
+  const logPath = path.join(LOG_DIR, filename);
+  const stream = fs.createWriteStream(logPath, { flags: 'a' });
+
+  stream.on('error', (err) => {
+    console.error(`[FileLogger] write stream error: ${err.message}`);
+  });
+
+  function log(...args: Array<unknown>): void {
+    const timestamp = new Date().toISOString();
+    const message = args.map((a) => (typeof a === 'string' ? a : String(a))).join(' ');
+    const line = `[${timestamp}] ${message}`;
+
+    console.log(line);
+    stream.write(`${line}\n`);
+  }
+
+  function close(): Promise<void> {
+    return new Promise((resolve, reject) => {
+      stream.end((err?: Error | null) => (err ? reject(err) : resolve()));
+    });
+  }
+
+  return { close, log };
+}