diff --git a/.github/workflows/ports_esp32.yml b/.github/workflows/ports_esp32.yml
index b86c6a76f8..c87552ade3 100644
--- a/.github/workflows/ports_esp32.yml
+++ b/.github/workflows/ports_esp32.yml
@@ -12,6 +12,10 @@ on:
       - 'lib/**'
       - 'drivers/**'
       - 'ports/esp32/**'
+  schedule:
+     # Scheduled run exists to keep master branch ESP-IDF cache entry hot
+     # and prevent creating many redundant per-branch cache entries instead.
+     - cron: "20 0 * * *"
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
diff --git a/.github/workflows/ports_zephyr.yml b/.github/workflows/ports_zephyr.yml
index 9ce7034398..09ffd616b4 100644
--- a/.github/workflows/ports_zephyr.yml
+++ b/.github/workflows/ports_zephyr.yml
@@ -12,6 +12,10 @@ on:
       - 'lib/**'
       - 'ports/zephyr/**'
       - 'tests/**'
+  schedule:
+     # Scheduled run exists to keep master branch Zephyr cache entry hot
+     # and prevent creating many redundant per-branch cache entries instead.
+     - cron: "40 4 * * *"
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}