diff --git a/.github/workflows/DailyArm64.yml b/.github/workflows/DailyArm64.yml
index 25f657a69..e39bca67c 100644
--- a/.github/workflows/DailyArm64.yml
+++ b/.github/workflows/DailyArm64.yml
@@ -27,6 +27,8 @@ jobs:
   # Build aarch64 guest binaries once and upload them as artifacts for the
   # build-test and run-examples jobs to download.
   build-guests:
+    # Temporarily disabled while Arm runners are unavailable.
+    if: ${{ false }}
     strategy:
       fail-fast: false
       matrix:
@@ -40,6 +42,8 @@ jobs:
   # Full aarch64 build-and-test. full_aarch64: "true" re-enables the Miri and
   # single-driver steps that are skipped on PRs.
   build-test:
+    # Temporarily disabled while Arm runners are unavailable.
+    if: ${{ false }}
     needs: build-guests
     permissions:
       # checkout in the called workflow
@@ -60,6 +64,8 @@ jobs:
       full_aarch64: "true"
 
   run-examples:
+    # Temporarily disabled while Arm runners are unavailable.
+    if: ${{ false }}
     needs: build-guests
     strategy:
       fail-fast: false
@@ -77,6 +83,8 @@ jobs:
   # limited arm64 runners, and runs here daily instead. The tracing
   # fuzzers (fuzz_guest_trace, fuzz_guest_estimate_trace_event) are x86_64-only
   fuzzing:
+    # Temporarily disabled while Arm runners are unavailable.
+    if: ${{ false }}
     needs: build-guests
     strategy:
       fail-fast: false
diff --git a/.github/workflows/PrimeCaches.yml b/.github/workflows/PrimeCaches.yml
index 5dd65c220..035f965da 100644
--- a/.github/workflows/PrimeCaches.yml
+++ b/.github/workflows/PrimeCaches.yml
@@ -33,7 +33,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        arch: [X64, arm64]
+        # Temporarily disabled while Arm runners are unavailable.
+        arch: [X64]
+        # arch: [X64, arm64]
         config: [debug, release]
     uses: ./.github/workflows/dep_build_guests.yml
     secrets: inherit
@@ -74,12 +76,13 @@ jobs:
           - arch: X64
             hypervisor: hyperv-ws2025
             config: release
-          - arch: arm64
-            hypervisor: kvm
-            config: debug
-          - arch: arm64
-            hypervisor: kvm
-            config: release
+          # Arm cache entries are retained for when Arm CI is re-enabled.
+          # - arch: arm64
+          #   hypervisor: kvm
+          #   config: debug
+          # - arch: arm64
+          #   hypervisor: kvm
+          #   config: release
     timeout-minutes: ${{ fromJSON(vars.PRIME_CACHES_JOB_TIMEOUT || '30') }}
     runs-on: ${{ fromJson(matrix.arch == 'X64'
         && format('["self-hosted", "{0}", "X64", "1ES.Pool=hld-{1}-amd", "JobId=prime-cache-{2}-{3}-{4}-{5}-{6}"]',
diff --git a/.github/workflows/RegenSnapshotGoldens.yml b/.github/workflows/RegenSnapshotGoldens.yml
index 5a2f69621..b17826c09 100644
--- a/.github/workflows/RegenSnapshotGoldens.yml
+++ b/.github/workflows/RegenSnapshotGoldens.yml
@@ -124,7 +124,9 @@ jobs:
     if: needs.check-published.outputs.needs_publish == 'true'
     strategy:
       matrix:
-        arch: [X64, arm64]
+        # Temporarily disabled while Arm runners are unavailable.
+        arch: [X64]
+        # arch: [X64, arm64]
         config: [debug, release]
     uses: ./.github/workflows/dep_build_guests.yml
     with:
@@ -140,7 +142,9 @@ jobs:
       matrix:
         hypervisor: [kvm, mshv3, hyperv-ws2025]
         cpu: [amd, intel, apple]
-        arch: [X64, arm64]
+        # Temporarily disabled while Arm runners are unavailable.
+        arch: [X64]
+        # arch: [X64, arm64]
         config: [debug, release]
         exclude:
           # aarch64 covers Apple under KVM only.
@@ -148,12 +152,13 @@ jobs:
             hypervisor: mshv3
           - cpu: apple
             hypervisor: hyperv-ws2025
+          # Arm exclusions are retained for when Arm CI is re-enabled.
+          # - cpu: amd
+          #   arch: arm64
+          # - cpu: intel
+          #   arch: arm64
           - cpu: apple
             arch: X64
-          - cpu: amd
-            arch: arm64
-          - cpu: intel
-            arch: arm64
     runs-on: ${{ fromJson(
         format('["self-hosted", "{0}", "{1}"{2}]',
           matrix.hypervisor == 'hyperv-ws2025' && 'Windows' || 'Linux',
diff --git a/.github/workflows/ValidatePullRequest.yml b/.github/workflows/ValidatePullRequest.yml
index eee3f9717..f05c3ad32 100644
--- a/.github/workflows/ValidatePullRequest.yml
+++ b/.github/workflows/ValidatePullRequest.yml
@@ -57,7 +57,9 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        arch: [X64, arm64]
+        # Temporarily disabled while Arm runners are unavailable.
+        arch: [X64]
+        # arch: [X64, arm64]
         config: [debug, release]
     uses: ./.github/workflows/dep_build_guests.yml
     secrets: inherit
@@ -149,19 +151,22 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
+        # Temporarily disabled while Arm runners are unavailable.
         hypervisor: ['hyperv-ws2025', mshv3, kvm]
         cpu_vendor: [amd, intel, apple]
-        arch: [X64, arm64]
+        arch: [X64]
+        # arch: [X64, arm64]
         config: [debug, release]
         exclude:
         - cpu_vendor: apple
           hypervisor: hyperv-ws2025
         - cpu_vendor: apple
           hypervisor: mshv3
-        - cpu_vendor: amd
-          arch: arm64
-        - cpu_vendor: intel
-          arch: arm64
+        # Arm exclusions are retained for when Arm CI is re-enabled.
+        # - cpu_vendor: amd
+        #   arch: arm64
+        # - cpu_vendor: intel
+        #   arch: arm64
         - cpu_vendor: apple
           arch: X64
     uses: ./.github/workflows/dep_build_test.yml