diff --git a/nuxt/composables/useBlogList.ts b/nuxt/composables/useBlogList.ts
index fa213fccfe..134b396d22 100644
--- a/nuxt/composables/useBlogList.ts
+++ b/nuxt/composables/useBlogList.ts
@@ -6,10 +6,13 @@ export const BLOG_PAGE_SIZE = 19
 // which of these show as nav buttons; 'tips' has a route but isn't in that button list).
 export const BLOG_TAGS = ['how-to', 'node-red', 'ai', 'uns', 'dashboard', 'flowfuse', 'releases', 'news', 'plc', 'mqtt', 'opcua', 'modbus', 'tips']
 
-// Mirrors .eleventy.js's DEV_MODE_POSTS: future-dated posts are hidden outside production
-// (Netlify sets CONTEXT), so deploy previews and dev can still preview scheduled posts.
+// Mirrors .eleventy.js's DEV_MODE_POSTS: future-dated posts are hidden outside production,
+// so deploy previews and dev can still preview scheduled posts. The flag is baked at build
+// time (see nuxt.config.ts) rather than read from process.env here: a scheduled post gets no
+// prerendered file, so its URL is served by the Netlify function, where process.env.CONTEXT
+// is always undefined. That switched this check off and served the post before its date.
 export function isFuturePost(date: string | Date): boolean {
-    return new Date(date) > new Date() && process.env.CONTEXT === 'production'
+    return new Date(date) > new Date() && useRuntimeConfig().public.isProductionContext
 }
 
 export function useBlogList(tag: string | null, pageNumber: number) {
diff --git a/nuxt/nuxt.config.ts b/nuxt/nuxt.config.ts
index 76ef3c2709..2a433d5493 100644
--- a/nuxt/nuxt.config.ts
+++ b/nuxt/nuxt.config.ts
@@ -134,11 +134,14 @@ export default defineNuxtConfig({
     devtools: { enabled: true },
     modules: ['@nuxt/ui', '@nuxt/content', '@nuxtjs/seo', 'nuxt-studio', '@nuxt/image', './modules/docs-source', 'nuxt-llms'],
 
-    // Captured at build time (Netlify sets CONTEXT during the build, not necessarily
-    // in the deployed Function's runtime), then baked into the server bundle via
-    // runtimeConfig so analytics.ts doesn't depend on a process.env read at request time.
+    // Captured at build time (Netlify sets CONTEXT during the build, but passes only URL,
+    // SITE_NAME and SITE_ID to the deployed Function at runtime), then baked in via
+    // runtimeConfig so nothing depends on a process.env read at request time. Under `public`
+    // so the blog's scheduled-post check reads the same value everywhere it runs.
     runtimeConfig: {
-        isProductionContext: process.env.CONTEXT === 'production'
+        public: {
+            isProductionContext: process.env.CONTEXT === 'production'
+        }
     },
 
     css: ['~/assets/css/theme.css'],
diff --git a/nuxt/server/plugins/analytics.ts b/nuxt/server/plugins/analytics.ts
index 11fc884c02..6ada0d465b 100644
--- a/nuxt/server/plugins/analytics.ts
+++ b/nuxt/server/plugins/analytics.ts
@@ -2,7 +2,7 @@ let headHtml: string | null = null
 let bodyHtml: string | null = null
 
 export default defineNitroPlugin((nitroApp) => {
-    if (import.meta.dev || !useRuntimeConfig().isProductionContext) return
+    if (import.meta.dev || !useRuntimeConfig().public.isProductionContext) return
 
     nitroApp.hooks.hook('render:html', async (html) => {
         if (html.bodyAppend.some(s => s.includes('cc.min.js'))) return
diff --git a/nuxt/server/routes/blog/index.xml.ts b/nuxt/server/routes/blog/index.xml.ts
index 2458a16ffc..5c33c3a34b 100644
--- a/nuxt/server/routes/blog/index.xml.ts
+++ b/nuxt/server/routes/blog/index.xml.ts
@@ -69,8 +69,10 @@ function escapeXml(value: string): string {
         .replace(/>/g, '>')
 }
 
-function isFuturePost(date: string | Date): boolean {
-    return new Date(date) > new Date() && process.env.CONTEXT === 'production'
+// See useBlogList.ts: the production flag is baked at build time, not read from
+// process.env, which is empty of it inside the deployed Netlify function.
+function isFuturePost(date: string | Date, isProductionContext: boolean): boolean {
+    return new Date(date) > new Date() && isProductionContext
 }
 
 // entry.body is a minimark tree: { value: MinimarkNode[] } where a node is
@@ -178,7 +180,8 @@ export default defineEventHandler(async (event) => {
     const people = { ...teamPeople, ...guestPeople }
     // Full post bodies are heavy - cap the feed to the most recent posts rather
     // than shipping the entire multi-megabyte blog archive on every request.
-    const entries = allEntries.filter(entry => !isFuturePost(entry.date)).slice(0, 20)
+    const { isProductionContext } = useRuntimeConfig(event).public
+    const entries = allEntries.filter(entry => !isFuturePost(entry.date, isProductionContext)).slice(0, 20)
 
     // Mirrors useReleaseFeaturePage: splices plan-availability badges and changelog/docs
     // links into a release blog's body, resolved from its `features:` frontmatter.