diff --git a/dev-packages/cloudflare-integration-tests/runner.ts b/dev-packages/cloudflare-integration-tests/runner.ts
index 1b19e9e15efd..09bf18392609 100644
--- a/dev-packages/cloudflare-integration-tests/runner.ts
+++ b/dev-packages/cloudflare-integration-tests/runner.ts
@@ -20,7 +20,9 @@ process.on('exit', cleanupChildProcesses);
 
 // Wrangler can report "Ready" before it can actually handle requests.
 // This retries fetch on connection errors and transient 500 responses to handle this race condition.
-async function fetchWithRetry(url: string, init: RequestInit, maxRetries = 10, retryDelayMs = 200): Promise<Response> {
+// The budget (maxRetries * retryDelayMs) must cover the "ready-but-not-serving" window, which can be
+// several seconds on a loaded CI runner — hence a generous default.
+async function fetchWithRetry(url: string, init: RequestInit, maxRetries = 25, retryDelayMs = 200): Promise<Response> {
   for (let attempt = 0; attempt < maxRetries; attempt++) {
     try {
       const res = await fetch(url, init);
diff --git a/dev-packages/cloudflare-integration-tests/vite.config.mts b/dev-packages/cloudflare-integration-tests/vite.config.mts
index 10b3f319b762..a93b595b6ecd 100644
--- a/dev-packages/cloudflare-integration-tests/vite.config.mts
+++ b/dev-packages/cloudflare-integration-tests/vite.config.mts
@@ -10,7 +10,10 @@ export default defineConfig({
     },
     isolate: false,
     include: ['./suites/**/test.ts'],
-    testTimeout: 30_000,
+    // Each test spawns its own `wrangler dev` (cold workerd boot) and waits for envelopes to be
+    // delivered — there is no internal runner timeout, so this ceiling covers cold-start + async work +
+    // delivery. Cold-start is slow and highly variable on CI, so give it generous headroom to de-flake.
+    testTimeout: 60_000,
     // Ensure we can see debug output when DEBUG=true
     ...(process.env.DEBUG
       ? {