How do SMS quiet hours work?

Last updated: November 5, 2026

SMS quiet hours control when marketing SMS messages are allowed to send based on the recipient’s local time.

How quiet hours work

Quiet hours are the time period when marketing SMS should not be sent.
For U.S. recipients, the allowed sending window is typically 8:00 AM to 9:00 PM in the recipient’s local time.
Whippy may determine recipient time zone from the recipient’s phone number area code.
If a message is scheduled outside the allowed window, it may be delayed, blocked, or skipped depending on the workflow.

Review the audience before scheduling an SMS campaign or sequence.
Assume recipients may have different time zones based on area code.
Choose a send time safely within the allowed sending window across the audience.
For national audiences, use a mid-day send time when possible.
For sequences, enable quiet-hours support if you want messages to wait until the next allowed window.
Test with contacts across different area codes before launching high-volume sends.

Do not schedule SMS sends close to 8:00 AM or 9:00 PM.
Do not assume a recipient’s physical location matches their phone number area code.
Use business-hour-friendly send times to reduce delivery delays.

If a message did not send, check whether it fell outside quiet hours for that recipient.
If a campaign sends at different times, the audience may span multiple time zones.
If a sequence message is delayed, quiet-hours support may be working as expected.
If timing looks wrong, confirm the recipient phone number area code and scheduling settings.