diff --git a/scripts/lighthouse-budget.mjs b/scripts/lighthouse-budget.mjs
index 12ef0832..c190df17 100644
--- a/scripts/lighthouse-budget.mjs
+++ b/scripts/lighthouse-budget.mjs
@@ -150,6 +150,9 @@ export function isChromeConnectionError(error) {
       /unable to connect to chrome/i.test(message) ||
       /failed to fetch browser websocket url/i.test(message) ||
       /chrome (has crashed|failed to launch|connection)/i.test(message) ||
+      // chrome-launcher's launch timeout: Chrome started and never wrote its
+      // DevTools port to chrome-err.log.
+      /waiting for dynamic debugging port/i.test(message) ||
       /(target|session) closed/i.test(message)
     ) {
       return true;
diff --git a/scripts/lighthouse-budget.test.mjs b/scripts/lighthouse-budget.test.mjs
index 8e12634d..c98950de 100644
--- a/scripts/lighthouse-budget.test.mjs
+++ b/scripts/lighthouse-budget.test.mjs
@@ -120,6 +120,9 @@ test("isChromeConnectionError matches Chrome/connection failures and not budget
   );
   assert.ok(isChromeConnectionError(new Error("read ECONNRESET")));
   assert.ok(isChromeConnectionError(new Error("socket hang up")));
+  assert.ok(
+    isChromeConnectionError(new Error("waiting for dynamic debugging port in chrome-err.log")),
+  );
   assert.ok(
     !isChromeConnectionError(new Error("marketing performance budget exceeded: 0.5 < 0.66")),
   );