diff --git a/deno_dist/helper/dev/index.ts b/deno_dist/helper/dev/index.ts
index 22ef29be8..c32683be7 100644
--- a/deno_dist/helper/dev/index.ts
+++ b/deno_dist/helper/dev/index.ts
@@ -39,6 +39,16 @@ export const inspectRoutes = <E extends Env>(hono: Hono<E>): RouteData[] => {
 }
 
 export const showRoutes = <E extends Env>(hono: Hono<E>, opts?: ShowRoutesOptions) => {
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  const { process, Deno } = globalThis as any
+  const isNoColor =
+    typeof process !== 'undefined'
+      ? // eslint-disable-next-line no-unsafe-optional-chaining
+        'NO_COLOR' in process?.env
+      : typeof Deno?.noColor === 'boolean'
+      ? (Deno.noColor as boolean)
+      : false
+  const colorEnabled = opts?.colorize ?? !isNoColor
   const routeData: Record<string, RouteData[]> = {}
   let maxMethodLength = 0
   let maxPathLength = 0
@@ -61,7 +71,7 @@ export const showRoutes = <E extends Env>(hono: Hono<E>, opts?: ShowRoutesOption
       }
       const { method, path, routes } = data
 
-      const methodStr = opts?.colorize ?? true ? `\x1b[32m${method}\x1b[0m` : method
+      const methodStr = colorEnabled ? `\x1b[32m${method}\x1b[0m` : method
       console.log(`${methodStr} ${' '.repeat(maxMethodLength - method.length)} ${path}`)
 
       if (!opts?.verbose) {
diff --git a/src/helper/dev/index.test.ts b/src/helper/dev/index.test.ts
index ba3bbb6f2..54bb2071e 100644
--- a/src/helper/dev/index.test.ts
+++ b/src/helper/dev/index.test.ts
@@ -126,6 +126,51 @@ describe('showRoutes()', () => {
   })
 })
 
+describe('showRoutes() in NO_COLOR', () => {
+  let logs: string[] = []
+
+  let originalLog: typeof console.log
+  beforeAll(() => {
+    vi.stubEnv('NO_COLOR', '1')
+    originalLog = console.log
+    console.log = (...args) => logs.push(...args)
+  })
+  afterAll(() => {
+    vi.unstubAllEnvs()
+    console.log = originalLog
+  })
+
+  beforeEach(() => {
+    logs = []
+  })
+  it('should render not colorized output', async () => {
+    showRoutes(app)
+    expect(logs).toEqual([
+      'GET      /',
+      'GET      /named',
+      'POST     /',
+      'PUT      /',
+      'PATCH    /',
+      'DELETE   /',
+      'OPTIONS  /',
+      'GET      /static',
+    ])
+  })
+  it('should render colorized output if colorize: true', async () => {
+    showRoutes(app, { colorize: true })
+    expect(logs).toEqual([
+      '\x1b[32mGET\x1b[0m      /',
+      '\x1b[32mGET\x1b[0m      /named',
+      '\x1b[32mPOST\x1b[0m     /',
+      '\x1b[32mPUT\x1b[0m      /',
+      '\x1b[32mPATCH\x1b[0m    /',
+      '\x1b[32mDELETE\x1b[0m   /',
+      '\x1b[32mOPTIONS\x1b[0m  /',
+      '\x1b[32mGET\x1b[0m      /static',
+    ])
+  })
+})
+
 describe('geRouterName()', () => {
   it('Should return the correct router name', async () => {
     const app = new Hono({
diff --git a/src/helper/dev/index.ts b/src/helper/dev/index.ts
index ed07a5927..ed8fa90a9 100644
--- a/src/helper/dev/index.ts
+++ b/src/helper/dev/index.ts
@@ -39,6 +39,16 @@ export const inspectRoutes = <E extends Env>(hono: Hono<E>): RouteData[] => {
 }
 
 export const showRoutes = <E extends Env>(hono: Hono<E>, opts?: ShowRoutesOptions) => {
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  const { process, Deno } = globalThis as any
+  const isNoColor =
+    typeof process !== 'undefined'
+      ? // eslint-disable-next-line no-unsafe-optional-chaining
+        'NO_COLOR' in process?.env
+      : typeof Deno?.noColor === 'boolean'
+      ? (Deno.noColor as boolean)
+      : false
+  const colorEnabled = opts?.colorize ?? !isNoColor
   const routeData: Record<string, RouteData[]> = {}
   let maxMethodLength = 0
   let maxPathLength = 0
@@ -61,7 +71,7 @@ export const showRoutes = <E extends Env>(hono: Hono<E>, opts?: ShowRoutesOption
       }
       const { method, path, routes } = data
 
-      const methodStr = opts?.colorize ?? true ? `\x1b[32m${method}\x1b[0m` : method
+      const methodStr = colorEnabled ? `\x1b[32m${method}\x1b[0m` : method
       console.log(`${methodStr} ${' '.repeat(maxMethodLength - method.length)} ${path}`)
 
       if (!opts?.verbose) {