What time should I send my SMS flash sale text?

Timing matters almost as much as the content of your message. Thursday and Friday evenings between 6 PM and 8 PM align with the moment your customers are transitioning from workweek mode to weekend planning mode. They're thinking about what they'll wear this weekend, where they're going, and what they need — which makes them maximally receptive to a curated outfit suggestion.

The recommended monthly cadence starts on Monday with a teaser email to your full list hinting that something exclusive is coming. Then on Thursday at 6 PM, your first SMS goes out to VIPs with the flash sale link and a four-hour window. At the two-hour mark, post Instagram Stories showing real remaining stock counts. At around 9 PM — two hours before the sale closes — send your closing-window reminder text with a live click count for social proof.

The closing-window reminder is typically the single highest-converting message of the entire flash sale, so scheduling it in advance is critical. If you're busy with customers on the floor and forget to send it manually, you leave significant revenue on the table. Schedule both messages ahead of time in Klaviyo's campaign builder.