diff --git a/data/experiment-recipe-samples/desktop-97-rollout.json b/data/experiment-recipe-samples/desktop-97-rollout.json
new file mode 100644
index 00000000..1a35d4fb
--- /dev/null
+++ b/data/experiment-recipe-samples/desktop-97-rollout.json
@@ -0,0 +1,48 @@
+{
+  "appId": "firefox-desktop",
+  "appName": "firefox_desktop",
+  "application": "firefox-desktop",
+  "arguments": {},
+  "isRollout": true,
+  "branches": [
+    {
+      "feature": {
+        "enabled": true,
+        "featureId": "urlbar",
+        "value": {
+          "firefoxSuggestLabelsEnabled": true,
+          "quickSuggestEnabled": false,
+          "quickSuggestNonSponsoredIndex": -1,
+          "quickSuggestShouldShowOnboardingDialog": true,
+          "quickSuggestShowOnboardingDialogAfterNRestarts": 2,
+          "quickSuggestSponsoredIndex": -1
+        }
+      },
+      "ratio": 1,
+      "slug": "control"
+    }
+  ],
+  "bucketConfig": {
+    "count": 1700,
+    "namespace": "urlbar-21-rollout",
+    "randomizationUnit": "normandy_id",
+    "start": 7300,
+    "total": 10000
+  },
+  "channel": "release",
+  "endDate": null,
+  "featureIds": ["urlbar"],
+  "id": "desktop-rollout-firefox-suggest-history-rollout-3",
+  "isEnrollmentPaused": true,
+  "outcomes": [],
+  "probeSets": [],
+  "proposedDuration": 28,
+  "proposedEnrollment": 7,
+  "referenceBranch": "control",
+  "schemaVersion": "1.7.0",
+  "slug": "desktop-rollout-example-firefox-suggest-history-rollout-3",
+  "startDate": "2021-08-24",
+  "targeting": "browserSettings.update.channel == \"release\" && version|versionCompare('89.!') >= 0 && 'app.shield.optoutstudies.enabled'|preferenceValue && 'browser.urlbar.showSearchSuggestionsFirst'|preferenceValue && locale in ['en-CA', 'en-GB', 'en-US'] && region in ['US']",
+  "userFacingDescription": "a UX treatment of history suggestions from Firefox",
+  "userFacingName": "Desktop Rollout Example Firefox Suggest History Rollout 3"
+}
diff --git a/data/experiment-recipe-samples/mobile-android-rollout.json b/data/experiment-recipe-samples/mobile-android-rollout.json
new file mode 100644
index 00000000..8e52fb4b
--- /dev/null
+++ b/data/experiment-recipe-samples/mobile-android-rollout.json
@@ -0,0 +1,54 @@
+{
+  "appId": "org.mozilla.firefox",
+  "appName": "fenix",
+  "application": "org.mozilla.firefox",
+  "arguments": {},
+  "isRollout": true,
+  "branches": [
+    {
+      "feature": {
+        "enabled": true,
+        "featureId": "homescreen",
+        "value": {
+          "sections-enabled": {
+            "jumpBackIn": true,
+            "pocket": true,
+            "recentExplorations": true,
+            "recentlySaved": true,
+            "topSites": true
+          }
+        }
+      },
+      "ratio": 1,
+      "slug": "control"
+    }
+  ],
+  "bucketConfig": {
+    "count": 9000,
+    "namespace": "fenix-homescreen-release-2-rollout",
+    "randomizationUnit": "nimbus_id",
+    "start": 0,
+    "total": 10000
+  },
+  "channel": "release",
+  "endDate": null,
+  "featureIds": ["homescreen"],
+  "id": "mobile-rollout-example-all-users-home-screen-android-production",
+  "isEnrollmentPaused": false,
+  "outcomes": [
+    {
+      "priority": "secondary",
+      "slug": "default-browser"
+    }
+  ],
+  "probeSets": [],
+  "proposedDuration": 45,
+  "proposedEnrollment": 28,
+  "referenceBranch": "control",
+  "schemaVersion": "1.7.0",
+  "slug": "mobile-rollout-example-all-users-home-screen-android-production",
+  "startDate": null,
+  "targeting": "true",
+  "userFacingDescription": "We want to understand the impact of the new Home screen on our users, to be measured by increased usage.",
+  "userFacingName": "Mobile Rollout Example All Users Home Screen Android Production"
+}
diff --git a/data/experiment-recipe-samples/mobile-ios-rollout.json b/data/experiment-recipe-samples/mobile-ios-rollout.json
new file mode 100644
index 00000000..b710cb2c
--- /dev/null
+++ b/data/experiment-recipe-samples/mobile-ios-rollout.json
@@ -0,0 +1,52 @@
+{
+  "appId": "org.mozilla.ios.Firefox",
+  "appName": "firefox_ios",
+  "application": "org.mozilla.ios.Firefox",
+  "arguments": {},
+  "isRollout": true,
+  "branches": [
+    {
+      "feature": {
+        "enabled": true,
+        "featureId": "homescreen",
+        "value": {
+          "sections-enabled": {
+            "jumpBackIn": true,
+            "libraryShortcuts": false,
+            "recentlySaved": true
+          }
+        }
+      },
+      "ratio": 1,
+      "slug": "control"
+    }
+  ],
+  "bucketConfig": {
+    "count": 6000,
+    "namespace": "ios-homescreen-release-2-rollout",
+    "randomizationUnit": "nimbus_id",
+    "start": 0,
+    "total": 10000
+  },
+  "channel": "release",
+  "endDate": null,
+  "featureIds": ["homescreen"],
+  "id": "mobile-rollout-example-all-users-homescreen-ios-production",
+  "isEnrollmentPaused": false,
+  "outcomes": [
+    {
+      "priority": "secondary",
+      "slug": "default_browser"
+    }
+  ],
+  "probeSets": [],
+  "proposedDuration": 28,
+  "proposedEnrollment": 7,
+  "referenceBranch": "control",
+  "schemaVersion": "1.7.0",
+  "slug": "mobile-rollout-example-all-users-homescreen-ios-production",
+  "startDate": null,
+  "targeting": "true",
+  "userFacingDescription": "We want to understand the impact of the new Home screen on our users, to be measured by increased usage.",
+  "userFacingName": "Mobile Rollout Example All Users HomeScreen iOS Production"
+}
diff --git a/test/test-experiment-recipe-firefox.ts b/test/test-experiment-recipe-firefox.ts
index 96e9d966..dc40f0cb 100644
--- a/test/test-experiment-recipe-firefox.ts
+++ b/test/test-experiment-recipe-firefox.ts
@@ -14,6 +14,14 @@ describe("experiment schemas", () => {
     assert.equal(result.ok, false, "validation should fail");
     assert.propertyVal(result.errors[0], "message", 'should match format "date"');
   });
+  it("should fail on a non-boolean for a boolean", async () => {
+    const result = typeGuards.experiments_checkNimbusExperiment({
+      ...TEST_EXPERIMENT,
+      isRollout: "foo",
+    });
+    assert.equal(result.ok, false, "validation should fail");
+    assert.propertyVal(result.errors[0], "message", "should be boolean");
+  });
   it("should fail on a non-integer value for a number", async () => {
     const result = typeGuards.experiments_checkNimbusExperiment({
       ...TEST_EXPERIMENT,
diff --git a/types/experiments.ts b/types/experiments.ts
index 43b0db06..ece56ff4 100644
--- a/types/experiments.ts
+++ b/types/experiments.ts
@@ -47,6 +47,14 @@ export interface NimbusExperiment {
    */
   isEnrollmentPaused: boolean;
 
+  /**
+   * When this property is set to true, treat this experiment as a rollout.
+   * Rollouts are currently handled as single-branch experiments separated
+   * from the bucketing namespace for normal experiments.
+   * See also: https://mozilla-hub.atlassian.net/browse/SDK-405
+   */
+  isRollout?: boolean;
+
   /** Bucketing configuration */
   bucketConfig: BucketConfig;