How to Start Windows on Your Mac After Setting Up Boot Camp

Boot Camp lets you start your Mac directly into Windows, not through macOS

After you install Windows through Boot Camp, your Mac can boot into either operating system. When you turn on your Mac, you hold down the Option key to choose which one loads. If you do nothing, your Mac starts into whichever system you set as the default. This is different from running Windows inside macOS through virtualization — Boot Camp gives Windows direct access to your hardware, which matters for performance and for programs that need full system control.

The process is straightforward once Boot Camp is installed, but the timing and the key you press matter. Holding the wrong key or releasing it too early sends you back to your normal startup.

Key Takeaways

Hold the Option key when ready when you press the power button, and keep holding it until the startup disk menu appears — usually three to five seconds.
The Windows partition shows as "BOOTCAMP" or "Windows" in the startup menu; click it and then click the arrow to boot into it.
You can set Windows as your default startup disk in macOS System Settings so your Mac boots into Windows automatically unless you choose otherwise.
If you need to return to macOS quickly, restart and hold Option again to switch back — you do not need to reinstall anything.
Some Macs with Apple silicon chips cannot run Boot Camp at all; Intel-based Macs and older Apple silicon Macs with Monterey or earlier can use it.

Hold Option at startup to see the boot menu

The most direct way to launch Windows is to restart your Mac and hold down the Option key the moment the screen goes black or shows the Apple logo. Keep holding it until you see a menu with disk icons and labels. This menu appears within a few seconds on most Macs. The Windows partition usually shows as "BOOTCAMP" in white text, or sometimes as "Windows" with a Windows logo.

Release the Option key once the menu is visible. Click the BOOTCAMP disk, then click the arrow button below it (or press Enter). Your Mac will restart into Windows. The first time this happens, Windows may take longer to load because it is configuring itself for your hardware. Subsequent boots are faster.

If you see only your macOS disk and no Windows option, Boot Camp either was not installed correctly or the Windows partition was not created. Check System Settings under General > Startup Disk to confirm the BOOTCAMP partition exists. If it does not, you need to run the Boot Camp Assistant again and complete the full installation process.

Set Windows as your default startup disk in macOS

If you want your Mac to boot into Windows automatically every time you turn it on, you can set it as the default. Open System Settings in macOS, go to General, then click Startup Disk. You will see your macOS disk and the BOOTCAMP partition listed. Click the BOOTCAMP disk, then click Restart. Your Mac will restart into Windows and will continue to boot into Windows by default from that point forward.

To switch back to macOS as the default, restart into macOS (using Option at startup), open System Settings again, and select your macOS disk as the startup disk. This does not delete Windows or change anything on the Windows side — it only changes which system loads when you power on.

Restart from Windows back to macOS

Once you are running Windows, you can restart back into macOS without holding any keys if macOS is set as your default startup disk. Click the Windows Start menu, select Power, and choose Restart. Your Mac will restart into macOS normally.

If Windows is set as your default startup disk and you want to boot back into macOS, hold Option during the restart. The startup menu will appear, and you can select your macOS disk. After you do this once, you can change the default back to macOS in System Settings if you prefer.

Troubleshoot if Windows does not appear in the startup menu

If you hold Option at startup and see only your macOS disk, the Windows partition may not be visible to the firmware. Restart into macOS and open Disk Utility (in Applications > Utilities). Look at the sidebar on the left — you should see your physical drive listed, and under it, separate partitions for macOS and BOOTCAMP. If the BOOTCAMP partition is there but does not show in the startup menu, the partition table may be corrupted.

Try restarting your Mac and holding Option again, waiting a full ten seconds before releasing the key. Sometimes the menu takes longer to appear on older Macs. If it still does not show, you may need to reinstall Boot Camp. This erases the Windows partition, so back up any files you need first. Run Boot Camp Assistant again from Applications > Utilities and follow the full installation process.

On newer Macs with Apple silicon chips (M1, M2, M3, and later), Boot Camp is not available at all. These Macs can run Windows only through virtualization software like Parallels Desktop or UTM, which runs Windows inside macOS rather than as a separate boot option.

Understand what happens to your files when you switch systems

When you boot into Windows, you are running a completely separate operating system on a separate partition. Files you create or read in Windows stay on the Windows partition and are not visible from macOS. Files on your macOS partition are not visible from Windows unless you mount the macOS drive, which requires special software.

This separation is intentional — it keeps the two systems from interfering with each other. If you need to share files between macOS and Windows, you can use an external drive, cloud storage like OneDrive or iCloud, or third-party tools designed to bridge the two partitions. Do not try to delete or modify the BOOTCAMP partition from macOS Disk Utility unless you are completely removing Windows, because doing so will make Windows unbootable.

Know the hardware requirements for Boot Camp

Boot Camp works on Intel-based Macs and on the first generation of Apple silicon Macs (M1 models) running macOS Monterey or earlier. If you have an M1 Mac running Ventura or later, or any newer Apple silicon Mac (M2, M3, M4), Boot Camp is not available. Apple removed the feature because these newer chips cannot run Windows natively.

To check what Mac you have, click the Apple menu in the top left, select About This Mac, and look at the Processor line. If it says Intel, Boot Camp is available. If it says Apple M1, M2, M3, or M4, check your macOS version — if it is Monterey or earlier, Boot Camp may work, but if it is Ventura or later, you cannot use Boot Camp on that machine.

Frequently Asked Questions

What key do I hold to see the startup menu on a Mac?

Hold the Option key (also labeled Alt on some keyboards) when ready when you press the power button or restart. Keep holding it until you see a menu with disk icons. On some older Macs, you may need to hold Option and Command together, but Option alone works on most modern Macs.

Can I run Windows and macOS at the same time with Boot Camp?

No. Boot Camp lets you choose one system or the other at startup, but only one runs at a time. If you need to run both simultaneously, you need virtualization software like Parallels Desktop, which runs Windows inside macOS. Virtualization is slower than Boot Camp but lets you switch between systems without restarting.

Will my Windows files disappear if I restart into macOS?

No. Your Windows files stay on the Windows partition. When you boot into macOS, that partition is not mounted, so you cannot see the files, but they are still there. When you boot back into Windows, all your files are exactly where you left them.

How do I remove Windows and get my disk space back?

Open Boot Camp Assistant in macOS, and it will offer an option to remove Windows. This erases the BOOTCAMP partition and returns that space to your macOS drive. You cannot do this from Windows — you must boot into macOS first. Back up any Windows files you need before you remove the partition.

Why is my Mac booting into Windows when I want macOS?

Windows is set as your default startup disk. Restart into macOS by holding Option at startup, then open System Settings, go to General > Startup Disk, select your macOS disk, and click Restart. Your Mac will boot into macOS by default from then on.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.