diff --git a/packages/tanstackstart-react/src/vite/sourceMaps.ts b/packages/tanstackstart-react/src/vite/sourceMaps.ts
index 817cad432a22..a0cf3f4e84c7 100644
--- a/packages/tanstackstart-react/src/vite/sourceMaps.ts
+++ b/packages/tanstackstart-react/src/vite/sourceMaps.ts
@@ -1,9 +1,35 @@
 import { sentryVitePlugin } from '@sentry/bundler-plugins/vite';
+import * as path from 'node:path';
 import type { Plugin, UserConfig } from 'vite';
 import type { SentryTanstackStartOptions } from './sentryTanstackStart';
 
 type FilesToDeleteAfterUpload = string | string[] | undefined;
 
+/** TanStack Router and Start split route files into virtual modules, e.g. `index.tsx?tss-serverfn-split`. */
+const TANSTACK_SPLIT_QUERY_REGEX = /\?ts[rs]-[^/]*$/;
+
+/** Sources such as `virtual:#nitro/runtime` are no file paths. Two letters at least, so drive letters, like `C:`, are not matched by the regex. */
+const SCHEME_REGEX = /^[a-z][a-z\d+.-]+:/i;
+
+/**
+ * Makes source paths relative to the project root and removes TanStack's split queries, so that client and server
+ * frames show the path of the source file, such as `src/routes/index.tsx`.
+ *
+ * Paths in a source map are relative to the map's directory, which the default hook ignores.
+ *
+ * @internal Only exported for testing.
+ */
+export function rewriteTanstackStartSource(source: string, _map: unknown, context?: { mapDir: string }): string {
+  const sourcePath = source.replace(TANSTACK_SPLIT_QUERY_REGEX, '');
+
+  if (SCHEME_REGEX.test(sourcePath)) {
+    return sourcePath;
+  }
+
+  const absolutePath = path.resolve(context?.mapDir ?? process.cwd(), sourcePath);
+  return path.relative(process.cwd(), absolutePath).split(path.sep).join('/');
+}
+
 /**
  * A Sentry plugin for adding the @sentry/bundler-plugins/vite to automatically upload source maps to Sentry.
  */
@@ -70,7 +96,7 @@ export function makeAddSentryVitePlugin(options: SentryTanstackStartOptions): Pl
       assets: sourcemaps?.assets,
       disable: sourcemaps?.disable,
       ignore: sourcemaps?.ignore,
-      rewriteSources: sourcemaps?.rewriteSources,
+      rewriteSources: sourcemaps?.rewriteSources ?? rewriteTanstackStartSource,
       resolveSourceMap: sourcemaps?.resolveSourceMap,
       filesToDeleteAfterUpload: filesToDeleteAfterUploadPromise,
     },
diff --git a/packages/tanstackstart-react/test/vite/sourceMaps.test.ts b/packages/tanstackstart-react/test/vite/sourceMaps.test.ts
index e5ea14c95b3e..eb4b3740b658 100644
--- a/packages/tanstackstart-react/test/vite/sourceMaps.test.ts
+++ b/packages/tanstackstart-react/test/vite/sourceMaps.test.ts
@@ -2,11 +2,13 @@
 import type { SentryVitePluginOptions } from '@sentry/bundler-plugins/vite';
 import type { UserConfig } from 'vite';
 import { mergeConfig } from 'vite';
-import { beforeEach, describe, expect, it, vi } from 'vitest';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import * as path from 'path';
 import {
   getUpdatedSourceMapSettings,
   makeAddSentryVitePlugin,
   makeEnableSourceMapsVitePlugin,
+  rewriteTanstackStartSource,
 } from '../../src/vite/sourceMaps';
 
 const mockedSentryVitePlugin = {
@@ -273,6 +275,16 @@ describe('makeAddSentryVitePlugin()', () => {
     );
   });
 
+  it('rewrites sources with the TanStack Start hook by default', () => {
+    makeAddSentryVitePlugin({});
+
+    expect(sentryVitePluginSpy).toHaveBeenCalledWith(
+      expect.objectContaining({
+        sourcemaps: expect.objectContaining({ rewriteSources: rewriteTanstackStartSource }),
+      }),
+    );
+  });
+
   it('sets the correct metaFramework in telemetry options', () => {
     makeAddSentryVitePlugin({
       org: 'my-org',
@@ -353,3 +365,56 @@ describe('getUpdatedSourceMapSettings', () => {
     expect(result).toBe('hidden');
   });
 });
+
+describe('rewriteTanstackStartSource', () => {
+  const projectRoot = path.resolve('/projects/shop');
+
+  beforeEach(() => {
+    vi.spyOn(process, 'cwd').mockReturnValue(projectRoot);
+  });
+
+  afterEach(() => {
+    vi.restoreAllMocks();
+  });
+
+  it.each([
+    {
+      label: 'a server function split from a route',
+      source: '../../../src/routes/index.tsx?tss-serverfn-split',
+      mapDir: '.output/server/_ssr',
+      expected: 'src/routes/index.tsx',
+    },
+    {
+      label: 'a route component split for the client',
+      source: '../../../src/routes/users.$userId.tsx?tsr-split=component',
+      mapDir: '.output/public/assets',
+      expected: 'src/routes/users.$userId.tsx',
+    },
+    {
+      label: 'a dependency',
+      source: '../../node_modules/.pnpm/h3@2.0.2/node_modules/h3/dist/index.mjs',
+      mapDir: '.output/server',
+      expected: 'node_modules/.pnpm/h3@2.0.2/node_modules/h3/dist/index.mjs',
+    },
+    {
+      label: 'a source that climbs fewer directories than the map is deep',
+      source: '../shared/format-price.ts',
+      mapDir: '.output/server/chunks/build',
+      expected: '.output/server/chunks/shared/format-price.ts',
+    },
+  ])('makes the path of $label relative to the project root', ({ source, mapDir, expected }) => {
+    expect(rewriteTanstackStartSource(source, {}, { mapDir: path.join(projectRoot, mapDir) })).toBe(expected);
+  });
+
+  it('keeps sources that are no file paths', () => {
+    const mapDir = path.join(projectRoot, '.output/server');
+
+    expect(rewriteTanstackStartSource('virtual:#nitro/virtual/plugins', {}, { mapDir })).toBe(
+      'virtual:#nitro/virtual/plugins',
+    );
+  });
+
+  it('resolves sources from the project root without a map directory', () => {
+    expect(rewriteTanstackStartSource('src/routes/index.tsx?tss-serverfn-split', {})).toBe('src/routes/index.tsx');
+  });
+});