diff --git a/packages/react-components/react-timepicker-compat-preview/src/components/TimePicker/TimePicker.test.tsx b/packages/react-components/react-timepicker-compat-preview/src/components/TimePicker/TimePicker.test.tsx
index 8a3d09b6ce3742..e51e327f997376 100644
--- a/packages/react-components/react-timepicker-compat-preview/src/components/TimePicker/TimePicker.test.tsx
+++ b/packages/react-components/react-timepicker-compat-preview/src/components/TimePicker/TimePicker.test.tsx
@@ -42,11 +42,11 @@ describe('TimePicker', () => {
     );
     handleTimeSelect.mockClear();
 
-    // Do not call onTimeSelect when Tab out but the value remains the same
+    // Do not call onTimeSelect on Enter when the value remains the same
     fireEvent.keyDown(input, { key: 'Enter', code: 'Enter' });
     expect(handleTimeSelect).toHaveBeenCalledTimes(0);
 
-    // Call onTimeSelect when Tab out and the value changes
+    // Call onTimeSelect on Enter when the value changes
     userEvent.type(input, '111{enter}');
     expect(handleTimeSelect).toHaveBeenCalledTimes(1);
     expect(handleTimeSelect).toHaveBeenCalledWith(
@@ -54,4 +54,26 @@ describe('TimePicker', () => {
       expect.objectContaining({ selectedTimeText: '10:30111', error: 'invalid-input' }),
     );
   });
+
+  it('when freeform, trigger onTimeSelect on blur when value change', () => {
+    const handleTimeSelect = jest.fn();
+    const { getByRole } = render(
+      <TimePicker freeform dateAnchor={dateAnchor} onTimeSelect={handleTimeSelect} startHour={10} />,
+    );
+
+    const input = getByRole('combobox');
+    const expandIcon = getByRole('button');
+
+    // Do not call onTimeSelect when clicking dropdown icon
+    userEvent.type(input, '111');
+    userEvent.click(expandIcon);
+    expect(handleTimeSelect).toHaveBeenCalledTimes(0);
+
+    // Call onTimeSelect on focus lose
+    userEvent.tab();
+    expect(handleTimeSelect).toHaveBeenCalledWith(
+      expect.anything(),
+      expect.objectContaining({ selectedTimeText: '111' }),
+    );
+  });
 });
diff --git a/packages/react-components/react-timepicker-compat-preview/src/components/TimePicker/useTimePicker.tsx b/packages/react-components/react-timepicker-compat-preview/src/components/TimePicker/useTimePicker.tsx
index e8c66ed9371837..d95439af6d1df0 100644
--- a/packages/react-components/react-timepicker-compat-preview/src/components/TimePicker/useTimePicker.tsx
+++ b/packages/react-components/react-timepicker-compat-preview/src/components/TimePicker/useTimePicker.tsx
@@ -1,5 +1,5 @@
 import * as React from 'react';
-import { mergeCallbacks, useControllableState } from '@fluentui/react-utilities';
+import { elementContains, mergeCallbacks, useControllableState, useMergedRefs } from '@fluentui/react-utilities';
 import { Enter } from '@fluentui/keyboard-keys';
 import type { Hour, TimePickerOption, TimePickerProps, TimePickerState, TimeSelectionData } from './TimePicker.types';
 import { ComboboxProps, useCombobox_unstable, Option } from '@fluentui/react-combobox';
@@ -92,7 +92,6 @@ export const useTimePicker_unstable = (props: TimePickerProps, ref: React.Ref<HT
         // Combobox clears selection when input value not matching any option; but we allow this case in freeform TimePicker.
         return;
       }
-
       const timeSelectionData: TimeSelectionData = {
         selectedTime: keyToDate(data.optionValue),
         selectedTimeText: data.optionText,
@@ -161,7 +160,7 @@ const useStableDateAnchor = (providedDate: Date | undefined, startHour: Hour, en
  * Mimics the behavior of the browser's change event for a freeform TimePicker.
  * The provided callback is called when input changed and:
  * - Enter/Tab key is pressed on the input.
- * - TODO: TimePicker loses focus, signifying a possible change.
+ * - TimePicker loses focus, signifying a possible change.
  */
 const useSelectTimeFromValue = (state: TimePickerState, callback: TimePickerProps['onTimeSelect']) => {
   const { activeOption, freeform, validateFreeFormTime, options, submittedText, setActiveOption, value } = state;
@@ -202,5 +201,25 @@ const useSelectTimeFromValue = (state: TimePickerState, callback: TimePickerProp
   );
   state.root.onKeyDown = mergeCallbacks(handleKeyDown, state.root.onKeyDown);
 
-  // TODO call selectTimeFromValue on blur
+  const rootRef = React.useRef<HTMLDivElement>(null);
+  state.root.ref = useMergedRefs(state.root.ref, rootRef);
+
+  if (state.listbox) {
+    state.listbox.tabIndex = -1; // allows it to be the relatedTarget of a blur event.
+  }
+
+  if (state.expandIcon) {
+    state.expandIcon.tabIndex = -1; // allows it to be the relatedTarget of a blur event.
+  }
+
+  const handleInputBlur = React.useCallback(
+    (e: React.FocusEvent<HTMLInputElement>) => {
+      const isOutside = e.relatedTarget ? !elementContains(rootRef.current, e.relatedTarget) : true;
+      if (isOutside) {
+        selectTimeFromValue(e);
+      }
+    },
+    [selectTimeFromValue],
+  );
+  state.input.onBlur = mergeCallbacks(handleInputBlur, state.input.onBlur);
 };