diff --git a/src/experimental/patterns/ec2-app.ts b/src/experimental/patterns/ec2-app.ts
index 62950519e..1a072c49d 100644
--- a/src/experimental/patterns/ec2-app.ts
+++ b/src/experimental/patterns/ec2-app.ts
@@ -111,7 +111,7 @@ class AutoScalingRollingUpdateTimeout implements IAspect {
  */
 export class HorizontallyScalingDeploymentPropertiesExperimental implements IAspect {
   public readonly stack: GuStack;
-  private readonly asgToParamMap: Map<string, CfnParameter>;
+  public readonly asgToParamMap: Map<string, CfnParameter>;
   private static instance: HorizontallyScalingDeploymentPropertiesExperimental | undefined;
 
   private constructor(scope: GuStack) {
diff --git a/src/riff-raff-yaml-file/deployments/cloudformation.ts b/src/riff-raff-yaml-file/deployments/cloudformation.ts
index 7483b5385..e9c9fdeba 100644
--- a/src/riff-raff-yaml-file/deployments/cloudformation.ts
+++ b/src/riff-raff-yaml-file/deployments/cloudformation.ts
@@ -1,4 +1,5 @@
 import type { GuAutoScalingGroup } from "../../constructs/autoscaling";
+import { HorizontallyScalingDeploymentPropertiesExperimental } from "../../experimental/patterns/ec2-app";
 import type { CdkStacksDifferingOnlyByStage, RiffRaffDeployment, RiffRaffDeploymentParameters } from "../types";
 
 export function cloudFormationDeployment(
@@ -72,3 +73,18 @@ export function getAmiParameters(autoScalingGroups: GuAutoScalingGroup[]): RiffR
     };
   }, {});
 }
+
+export function getMinInstancesInServiceParameters(
+  autoScalingGroups: GuAutoScalingGroup[],
+): RiffRaffDeploymentParameters {
+  return autoScalingGroups.reduce<RiffRaffDeploymentParameters>((acc, asg) => {
+    const { app } = asg;
+    const cfnParameter = HorizontallyScalingDeploymentPropertiesExperimental.getCfnParameterName(asg);
+    return {
+      ...acc,
+      [cfnParameter]: {
+        App: app,
+      },
+    };
+  }, {});
+}
diff --git a/src/riff-raff-yaml-file/index.test.ts b/src/riff-raff-yaml-file/index.test.ts
index cee641bdd..8bcdb615f 100644
--- a/src/riff-raff-yaml-file/index.test.ts
+++ b/src/riff-raff-yaml-file/index.test.ts
@@ -1,14 +1,19 @@
 import { App, Duration } from "aws-cdk-lib";
-import { UpdatePolicy } from "aws-cdk-lib/aws-autoscaling";
+import { CfnScalingPolicy, UpdatePolicy } from "aws-cdk-lib/aws-autoscaling";
 import { InstanceClass, InstanceSize, InstanceType } from "aws-cdk-lib/aws-ec2";
 import { Schedule } from "aws-cdk-lib/aws-events";
 import { Runtime } from "aws-cdk-lib/aws-lambda";
 import { AccessScope } from "../constants";
+import type { GuAutoScalingGroup } from "../constructs/autoscaling";
 import type { GuStackProps } from "../constructs/core";
 import { GuStack } from "../constructs/core";
 import { GuLambdaFunction } from "../constructs/lambda";
-import { GuEc2AppExperimental } from "../experimental/patterns/ec2-app";
+import {
+  GuEc2AppExperimental,
+  HorizontallyScalingDeploymentPropertiesExperimental,
+} from "../experimental/patterns/ec2-app";
 import { GuEc2App, GuNodeApp, GuPlayApp, GuScheduledLambda } from "../patterns";
+import { getTemplateAfterAspectInvocation } from "../utils/test";
 import { RiffRaffYamlFile } from "./index";
 
 describe("The RiffRaffYamlFile class", () => {
@@ -1413,4 +1418,106 @@ describe("The RiffRaffYamlFile class", () => {
       "
     `);
   });
+
+  it("Should include minInstancesInServiceParameters when GuEc2AppExperimental has a scaling policy", () => {
+    const app = new App({ outdir: "/tmp/cdk.out" });
+
+    class MyApplicationStack extends GuStack {
+      public readonly asg: GuAutoScalingGroup;
+
+      // eslint-disable-next-line custom-rules/valid-constructors -- unit testing
+      constructor(app: App, id: string, props: GuStackProps) {
+        super(app, id, props);
+
+        const appName = "my-app";
+
+        const { autoScalingGroup } = new GuEc2AppExperimental(this, {
+          app: appName,
+          instanceType: InstanceType.of(InstanceClass.T4G, InstanceSize.MICRO),
+          access: { scope: AccessScope.PUBLIC },
+          userData: {
+            distributable: {
+              fileName: `${appName}.deb`,
+              executionStatement: `dpkg -i /${appName}/${appName}.deb`,
+            },
+          },
+          certificateProps: {
+            domainName: "rip.gu.com",
+          },
+          monitoringConfiguration: { noMonitoring: true },
+          scaling: {
+            minimumInstances: 1,
+          },
+          applicationPort: 9000,
+          imageRecipe: "arm64-bionic-java11-deploy-infrastructure",
+          buildIdentifier: "TEST",
+        });
+
+        new CfnScalingPolicy(autoScalingGroup, "ScaleOut", {
+          autoScalingGroupName: autoScalingGroup.autoScalingGroupName,
+          policyType: "SimpleScaling",
+          adjustmentType: "ChangeInCapacity",
+          scalingAdjustment: 1,
+        });
+
+        this.asg = autoScalingGroup;
+      }
+    }
+
+    const guStack = new MyApplicationStack(app, "test-stack", {
+      stack: "test",
+      stage: "TEST",
+      env: { region: "eu-west-1" },
+    });
+
+    // Ensure the Aspects are invoked...
+    getTemplateAfterAspectInvocation(guStack);
+
+    // ...so that the CFN Parameters are added to the template, to then be processed by the `RiffRaffYamlFile`
+    const actual = new RiffRaffYamlFile(app).toYAML();
+
+    const cfnParameterName = HorizontallyScalingDeploymentPropertiesExperimental.getCfnParameterName(guStack.asg);
+
+    expect(actual).toMatchInlineSnapshot(`
+      "allowedStages:
+        - TEST
+      deployments:
+        asg-upload-eu-west-1-test-my-app:
+          type: autoscaling
+          actions:
+            - uploadArtifacts
+          regions:
+            - eu-west-1
+          stacks:
+            - test
+          app: my-app
+          parameters:
+            bucketSsmLookup: true
+            prefixApp: true
+          contentDirectory: my-app
+        cfn-eu-west-1-test-my-application-stack:
+          type: cloud-formation
+          regions:
+            - eu-west-1
+          stacks:
+            - test
+          app: my-application-stack
+          contentDirectory: /tmp/cdk.out
+          parameters:
+            templateStagePaths:
+              TEST: test-stack.template.json
+            amiParametersToTags:
+              AMIMyapp:
+                BuiltBy: amigo
+                AmigoStage: PROD
+                Recipe: arm64-bionic-java11-deploy-infrastructure
+                Encrypted: 'true'
+            minInstancesInServiceParameters:
+              ${cfnParameterName}:
+                App: my-app
+          dependencies:
+            - asg-upload-eu-west-1-test-my-app
+      "
+    `);
+  });
 });
diff --git a/src/riff-raff-yaml-file/index.ts b/src/riff-raff-yaml-file/index.ts
index 2c5eba421..c26edfc3c 100644
--- a/src/riff-raff-yaml-file/index.ts
+++ b/src/riff-raff-yaml-file/index.ts
@@ -7,8 +7,13 @@ import { dump } from "js-yaml";
 import { GuAutoScalingGroup } from "../constructs/autoscaling";
 import { GuStack } from "../constructs/core";
 import { GuLambdaFunction } from "../constructs/lambda";
+import { HorizontallyScalingDeploymentPropertiesExperimental } from "../experimental/patterns/ec2-app";
 import { autoscalingDeployment, uploadAutoscalingArtifact } from "./deployments/autoscaling";
-import { cloudFormationDeployment, getAmiParameters } from "./deployments/cloudformation";
+import {
+  cloudFormationDeployment,
+  getAmiParameters,
+  getMinInstancesInServiceParameters,
+} from "./deployments/cloudformation";
 import { updateLambdaDeployment, uploadLambdaArtifact } from "./deployments/lambda";
 import { groupByClassNameStackRegionStage } from "./group-by";
 import type {
@@ -271,6 +276,11 @@ export class RiffRaffYamlFile {
 
           const amiParametersToTags = getAmiParameters(autoscalingGroups);
 
+          const minInServiceParamMap =
+            HorizontallyScalingDeploymentPropertiesExperimental.getInstance(stack).asgToParamMap;
+          const minInServiceAsgs = autoscalingGroups.filter((asg) => minInServiceParamMap.has(asg.node.id));
+          const minInstancesInServiceParameters = getMinInstancesInServiceParameters(minInServiceAsgs);
+
           deployments.set(cfnDeployment.name, {
             ...cfnDeployment.props,
             parameters: {
@@ -278,6 +288,9 @@ export class RiffRaffYamlFile {
 
               // only add the `amiParametersToTags` property if there are some
               ...(autoscalingGroups.length > 0 && { amiParametersToTags }),
+
+              // only add the `minInstancesInServiceParameters` property if there are some
+              ...(minInServiceAsgs.length > 0 && { minInstancesInServiceParameters }),
             },
           });
         });