diff --git a/packages/astro/src/actions/runtime/middleware.ts b/packages/astro/src/actions/runtime/middleware.ts
index 2fca9c5459..1425cadc84 100644
--- a/packages/astro/src/actions/runtime/middleware.ts
+++ b/packages/astro/src/actions/runtime/middleware.ts
@@ -10,7 +10,6 @@ import {
 	type SerializedActionResult,
 	serializeActionResult,
 } from './virtual/shared.js';
-import type { AstroCookie } from '../../core/cookies/cookies.js';
 
 export type Locals = {
 	_actionsInternal: {
@@ -30,7 +29,7 @@ export const onRequest = defineMiddleware(async (context, next) => {
 
 	const actionResultCookie = context.cookies.get('_actionResult');
 	if (actionResultCookie) {
-		return renderResult({ context, next, actionResultCookie });
+		return renderResult({ context, next, ...actionResultCookie.json() });
 	}
 
 	// Heuristic: If body is null, Astro might've reset this for prerendering.
@@ -59,11 +58,17 @@ export const onRequest = defineMiddleware(async (context, next) => {
 async function renderResult({
 	context,
 	next,
-	actionResultCookie,
-}: { context: APIContext; next: MiddlewareNext; actionResultCookie: AstroCookie }) {
+	actionResult,
+	actionName,
+}: {
+	context: APIContext;
+	next: MiddlewareNext;
+	actionResult: SerializedActionResult;
+	actionName: string;
+}) {
 	const locals = context.locals as Locals;
 
-	locals._actionsInternal = actionResultCookie.json();
+	locals._actionsInternal = { actionResult, actionName };
 	const response = await next();
 	context.cookies.delete('_actionResult');
 
@@ -100,6 +105,15 @@ async function handlePost({
 	const action = baseAction.bind(context);
 	const actionResult = await action(formData);
 
+	if (context.url.searchParams.get('_actionResultBehavior') === 'none') {
+		return renderResult({
+			context,
+			next,
+			actionName,
+			actionResult: serializeActionResult(actionResult),
+		});
+	}
+
 	return redirectWithResult({ context, next, actionName, actionResult });
 }
 
diff --git a/packages/astro/src/core/cookies/cookies.ts b/packages/astro/src/core/cookies/cookies.ts
index 41acbac41f..852be913d6 100644
--- a/packages/astro/src/core/cookies/cookies.ts
+++ b/packages/astro/src/core/cookies/cookies.ts
@@ -35,7 +35,7 @@ const DELETED_EXPIRATION = new Date(0);
 const DELETED_VALUE = 'deleted';
 const responseSentSymbol = Symbol.for('astro.responseSent');
 
-export class AstroCookie implements AstroCookieInterface {
+class AstroCookie implements AstroCookieInterface {
 	constructor(public value: string) {}
 	json() {
 		if (this.value === undefined) {
diff --git a/packages/astro/templates/actions.mjs b/packages/astro/templates/actions.mjs
index f38ba3fa96..4a692b525b 100644
--- a/packages/astro/templates/actions.mjs
+++ b/packages/astro/templates/actions.mjs
@@ -16,13 +16,18 @@ function toActionProxy(actionCallback = {}, aggregatedPath = '') {
 				toString: () => action.queryString,
 				// Progressive enhancement info for React.
 				$$FORM_ACTION: function () {
+					const searchParams = new URLSearchParams(action.toString());
+					// Astro will redirect with a GET request by default.
+					// Disable this behavior to preserve form state
+					// for React's progressive enhancement.
+					searchParams.set('_actionResultBehavior', 'none');
 					return {
 						method: 'POST',
 						// `name` creates a hidden input.
 						// It's unused by Astro, but we can't turn this off.
 						// At least use a name that won't conflict with a user's formData.
 						name: '_astroAction',
-						action: action.toString(),
+						action: '?' + searchParams.toString(),
 					};
 				},
 				// Note: `orThrow` does not have progressive enhancement info.