From Tarragona · 41.12° N · 1.24° E
Three getaways with a night away and four day trips from Tarragona for Sant Joan, 24 June: the verbena the night before on the beach and then newly thawed Andorran lakes, the green of Núria, the first canyon of summer, the Siurana reservoir and the Garraf coves.
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At the end of June the Tristaina lakes lose their snow and the season for this getaway begins, until September. Afternoons bring storms: start the lakes early, leave Caldea for afterwards and bring your ID card.

At the end of June the Núria valley has meadows in flower and no snow remains on the low paths. The Rack Railway moves to its summer timetable and is bought online; the Ripoll monasteries, under cover, for the hot hours.

June is among the best months for canyons in Guara: the water is no longer thaw water and August's crowds are not yet there. The 24th is a working day in Aragon; book guide, walkways and winery before leaving.

In summer the kayak on the Siurana reservoir opens daily, not just at weekends; its calendar changes each year, so confirm the 24th is already running. The Trona, first thing: at midday it has no shade.

In June the road to the Coll de la Creueta no longer has spring's gravel or August's traffic. Set off early, fill the tank in Berga and come down before the afternoon storms.

At a thousand metres, Prades is the nearest cool to Tarragona on Sant Joan morning, with the forest in its darkest green. The walk to the Roca Foradada is short; book the village inn, as the holiday fills.

In June Garraf has its beach with a lifeguard and not yet July and August's collapse on the road and train. Go by train and early, and book the rice facing the sea.
Questions
Yes, 24 June is a holiday across Catalonia. The big celebration is the verbena on the night of the 23rd.
In Prades, at a thousand metres, and in the Pyrenees: Núria and the Andorran lakes.
Geocaliahttps://www.geocalia.com/en/spain/catalonia/tarragona/getaways/sant-joan-long-weekend