diff --git a/.changeset/fresh-balloons-glow.md b/.changeset/fresh-balloons-glow.md
new file mode 100644
index 000000000000..5c71e9879824
--- /dev/null
+++ b/.changeset/fresh-balloons-glow.md
@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Fixes an issue where HMR would not trigger when modifying files while using @astrojs/cloudflare with prerenderEnvironment: 'node' enabled.
diff --git a/packages/astro/e2e/cloudflare-node-prerender-hmr.test.js b/packages/astro/e2e/cloudflare-node-prerender-hmr.test.js
new file mode 100644
index 000000000000..c616de3fc5c5
--- /dev/null
+++ b/packages/astro/e2e/cloudflare-node-prerender-hmr.test.js
@@ -0,0 +1,34 @@
+import { expect } from '@playwright/test';
+import { testFactory } from './test-utils.js';
+
+const test = testFactory(import.meta.url, {
+ root: './fixtures/cloudflare-node-prerender-hmr/',
+ devToolbar: {
+ enabled: false,
+ },
+});
+
+let devServer;
+
+test.beforeAll(async ({ astro }) => {
+ devServer = await astro.startDevServer();
+});
+
+test.afterAll(async () => {
+ await devServer.stop();
+});
+
+test.describe('Astro page', () => {
+ test('refresh with HMR', async ({ page, astro }) => {
+ await page.goto(astro.resolveUrl('/'));
+
+ const h = page.locator('h1');
+ await expect(h, 'original text set').toHaveText('Original content');
+
+ await astro.editFile('./src/pages/index.astro', (original) =>
+ original.replaceAll('Original', 'Updated'),
+ );
+
+ await expect(h, 'text changed').toHaveText('Updated content');
+ });
+});
diff --git a/packages/astro/e2e/fixtures/cloudflare-node-prerender-hmr/astro.config.mjs b/packages/astro/e2e/fixtures/cloudflare-node-prerender-hmr/astro.config.mjs
new file mode 100644
index 000000000000..18c994a1f265
--- /dev/null
+++ b/packages/astro/e2e/fixtures/cloudflare-node-prerender-hmr/astro.config.mjs
@@ -0,0 +1,9 @@
+// @ts-check
+import cloudflare from '@astrojs/cloudflare';
+import { defineConfig } from 'astro/config';
+
+export default defineConfig({
+ adapter: cloudflare({
+ prerenderEnvironment: 'node',
+ }),
+});
diff --git a/packages/astro/e2e/fixtures/cloudflare-node-prerender-hmr/package.json b/packages/astro/e2e/fixtures/cloudflare-node-prerender-hmr/package.json
new file mode 100644
index 000000000000..1f02c5468057
--- /dev/null
+++ b/packages/astro/e2e/fixtures/cloudflare-node-prerender-hmr/package.json
@@ -0,0 +1,13 @@
+{
+ "name": "@test/astro-cloudflare-node-prerender-mdx",
+ "version": "0.0.0",
+ "private": true,
+ "scripts": {
+ "dev": "astro dev",
+ "build": "astro build"
+ },
+ "dependencies": {
+ "@astrojs/cloudflare": "workspace:*",
+ "astro": "workspace:*"
+ }
+}
diff --git a/packages/astro/e2e/fixtures/cloudflare-node-prerender-hmr/src/pages/index.astro b/packages/astro/e2e/fixtures/cloudflare-node-prerender-hmr/src/pages/index.astro
new file mode 100644
index 000000000000..d7467b5195c7
--- /dev/null
+++ b/packages/astro/e2e/fixtures/cloudflare-node-prerender-hmr/src/pages/index.astro
@@ -0,0 +1,6 @@
+---
+---
+
+Original content
+Original content
+
diff --git a/packages/astro/src/vite-plugin-hmr-reload/index.ts b/packages/astro/src/vite-plugin-hmr-reload/index.ts
index 355aa035823b..c9378b501643 100644
--- a/packages/astro/src/vite-plugin-hmr-reload/index.ts
+++ b/packages/astro/src/vite-plugin-hmr-reload/index.ts
@@ -1,7 +1,7 @@
import type { EnvironmentModuleNode, Plugin } from 'vite';
-import { ASTRO_VITE_ENVIRONMENT_NAMES } from '../core/constants.js';
import { VIRTUAL_PAGE_RESOLVED_MODULE_ID } from '../vite-plugin-pages/const.js';
import { getDevCssModuleNameFromPageVirtualModuleName } from '../vite-plugin-css/util.js';
+import { isAstroServerEnvironment } from '../environments.js';
/**
* The very last Vite plugin to reload the browser if any SSR-only module are updated
@@ -15,7 +15,7 @@ export default function hmrReload(): Plugin {
hotUpdate: {
order: 'post',
handler({ modules, server, timestamp }) {
- if (this.environment.name !== ASTRO_VITE_ENVIRONMENT_NAMES.ssr) return;
+ if (!isAstroServerEnvironment(this.environment)) return;
let hasSsrOnlyModules = false;
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index ef9101e7473d..2782e5f0e3bc 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -1015,6 +1015,15 @@ importers:
specifier: ^3.5.30
version: 3.5.30(typescript@5.9.3)
+ packages/astro/e2e/fixtures/cloudflare-node-prerender-hmr:
+ dependencies:
+ '@astrojs/cloudflare':
+ specifier: workspace:*
+ version: link:../../../../integrations/cloudflare
+ astro:
+ specifier: workspace:*
+ version: link:../../..
+
packages/astro/e2e/fixtures/cloudflare/packages/my-lib: {}
packages/astro/e2e/fixtures/content-collections: