Hi Louisemoana,

Welcome to the IFSQN forums.
It appears that if it is your 1st unannounced and you are seasonal then it could be up to 6 weeks after 16th March. I have underlined the relevant parts of the BRCGS Global Standard for Food Safety Issue 9 below.
4 Unannounced Audit Protocol
The date of the audit shall not be notified to the site in advance of the audit. The audit will be unannounced and replace the normal scheduled audit. It can occur at any stage within the last 4 months of the audit cycle, including the 28 calendar days before the audit due date (i.e. at any point from 4 months before the audit due date).
4.7.2 Seasonal production sites
The audit due dates for some sites producing seasonal products may occur towards the beginning of the product’s season and this could limit the dates available to carry out unannounced audits before the end of the re-audit window. Therefore, in the first year that the site is within the unannounced programme, the audit window will be extended to allow the unannounced audit to be carried out up to 6 weeks after the audit due date. There will be no penalty for late audits.
Good luck with the audit.
Kind regards,
Tony