What is the best time to post YouTube Shorts?

It matters much less than the volume of advice about it suggests.

Long-form YouTube rewards an early view burst, so upload timing genuinely affects performance. The Shorts feed doesn't work that way — it surfaces a video to small test audiences over hours and days, and a Short can start moving 48 hours after upload.

If you want a time anyway, use your own Analytics: the "when your viewers are on YouTube" chart beats any general recommendation, because it reflects your audience rather than an average of everyone's.

What is worth optimising instead, in order: the hook, the topic, and publishing consistency. Any one of those moves results more than posting time does.