Fallout 76 nuke codes expire and refresh on a weekly cycle.
Fallout 76 nuke codes reset on a weekly cycle. When the code cycle changes, the old Alpha, Bravo, and Charlie silo codes expire and new launch codes become active.
FO76Silo shows the current weekly codes and a live countdown based on the active code-cycle data, so you can check the reset timer before using a Nuclear Keycard.
Site Alpha, Site Bravo, and Site Charlie each need their current code.
Always check the active code before spending a Nuclear Keycard.
HOW THE FALLOUT 76 NUKE CODE RESET WORKS
Fallout 76 uses a weekly nuke code cycle. During each cycle, the three main missile silos have active launch codes. Once the cycle expires, those codes should no longer be trusted for new launches.
FO76Silo calculates the visible countdown from the current code-cycle information. That means the reset timer shown on the main terminal follows the active data instead of relying only on a static written schedule.
If you are about to launch near reset time, check the code again before entering it.
A code that worked earlier in the week may stop working after the cycle changes.
DO ALPHA, BRAVO, AND CHARLIE RESET TOGETHER?
Site Alpha, Site Bravo, and Site Charlie are part of the weekly nuke code cycle. Each silo has its own listed code, and you should always match the code to the silo you are actually using.
- Launching from Site Alpha requires the current Alpha code.
- Launching from Site Bravo requires the current Bravo code.
- Launching from Site Charlie requires the current Charlie code.
- Do not use the Alpha code at Bravo or Charlie unless the code listing specifically matches.
WHAT HAPPENS IF A NUKE CODE EXPIRES?
If a code has expired, you should assume it is no longer safe to use. Entering the wrong code during launch can waste a Nuclear Keycard, which is why the reset countdown matters.
If you are inside a silo and the reset is close, pause before final launch authorization and check the current code again.
HOW TO CHECK CURRENT FALLOUT 76 NUKE CODES
The fastest way is to use the FO76Silo main terminal. It shows the current weekly launch codes for all three missile silos and displays the reset countdown in your local timezone.
- Open FO76Silo before entering the launch room.
- Find the matching silo: Alpha, Bravo, or Charlie.
- Copy or write down the exact eight-digit code.
- Insert your Nuclear Keycard, enter the matching code, then choose your target.
BEST TIME TO CHECK THE CODES
Check the codes right before you enter the final launch step. If you checked them hours earlier, the code may still be fine, but checking again before spending a Nuclear Keycard is safer.
This matters most near the weekly reset window, when the current code cycle is about to expire.
FAQ
When do Fallout 76 nuke codes reset?
They reset on a weekly cycle. FO76Silo shows the active reset countdown on the main terminal so you can see how long the current codes should remain valid.
Do all three silo codes reset?
Yes. Alpha, Bravo, and Charlie are part of the weekly code cycle. Always use the code that matches your selected silo.
Can I use last week's nuke code?
No. Once the code cycle changes, last week's code should be treated as expired.
Does the reset time show in my timezone?
FO76Silo displays the reset time using your device/browser timezone. The countdown points to the same global reset moment for everyone.
Why should I check the code right before launch?
Because an incorrect or expired code can waste a Nuclear Keycard. Checking before launch is the safest option.
RELATED FIELD GUIDES
Walk through keycards, silo prep, launch authorization, and target selection.
Pick the best nuke target for bosses, public events, or flux routes.
Check the current weekly code before spending a Nuclear Keycard.