Residential tenancy: the law decides when you can terminate at all
Under a residential tenancy (art. 2 LAU) the tenant is entitled to an extension of up to five years — seven if the landlord is a legal entity. Within that period you cannot, as landlord, simply “give notice”, whatever the contract says: terms that give the tenant less than the law are void. The openings that do exist:
Give notice four months before the end
If you want to end the contract at the end of the five (or seven) years, you must give formal notice at least four months before the end date (art. 10 LAU). If you do not, the contract rolls over tacitly in one-year periods, up to a maximum of three additional years. The tenant needs only two months for the same moment.
The narrow route of art. 9.3
One exception breaks through the five years: after the first contract year, you need the property as a principal residence for yourself or for first-degree family (including after divorce). Conditions: you are a private landlord, the reservation is stated expressly in the contract, and you give at least two months' notice. If you then fail to occupy the property within three months, the tenant may return under the old contract — or claim compensation.
After six months, with thirty days' notice
After six months the tenant may leave at any moment with thirty days' notice (art. 11 LAU). Compensation — at most one month's rent per remaining contract year, pro rata — can only be claimed if that clause is in the contract. If it is not, the tenant leaves without paying.
Temporada: ends by itself — if you pay attention
A seasonal let (art. 3.2 LAU) has no statutory extension: the contract ends on the agreed date. But watch out for the trap in the Civil Code: if the tenant stays on fifteen days past the end date without you demonstrably objecting, tacit continuation arises (tácita reconducción, art. 1566 and 1581 CC) — month by month, on a monthly rent. One timely burofax before or immediately after the end date prevents that. And did your “temporada” in fact never end because the tenant simply lives there? Then the problem is not the termination but the regime: reclassification into a residential tenancy.