When to plant tomatoes in San Marino: 25 April – 22 August

In San Marino, tomato: sow for seedlings from 11 February to 1 July; plant into a greenhouse from 4 April to 22 August; plant out into open ground from 25 April to 22 August. For plants and seeds, the places nearby include Fratelli Pesaresi (garden centre, 8 km) and I 2 Riccioli Verdi (garden centre, 11 km); addresses and opening hours are below.

Tomato in San Marino: soil, season and weather

In San Marino the soil, not frost, sets the date: the last frost is over around 9 February, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 25 April, 75 days later.

Last spring frost	9 February
Top 7 cm of soil at 15 °C	25 April, 75 days after the last frost
Into an unheated greenhouse	4 April – 22 August; April outside: 8.4 °C at night, 17.6 °C by day; card 16–27 °C
First autumn frost	12 December, 231 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	4 July – 31 October
Days left for picking	161
Daylight	11:19 on 4 March, 13:53 on 25 April
Watering outdoors when fruiting (card)	every 3 days; the driest month, July, has 7 rainy days

Tomato in San Marino: care after planting

Planted on 25 April: in the first weeks water every 4 days.

Feeding, by the card’s schedule from that day:

25 April — feed: balanced (NPK)
23 May — feed: nitrogen

Pests and diseases of tomato to watch for:

Dates count from the first planting day of the window above; a later planting moves them by as many days.

Weather in San Marino during the tomato season

Days average above the tomato card's 16–27 °C in June (27.7 °C), July (30 °C) and August (29.5 °C). Months that stay below 16 °C even by day on average: November (14.2 °C) and December (10.4 °C). Nights average below 16 °C in April, May and September–December (3.4–15.9 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
April	17.6	8.4	60	10	13:25
May	21.6	12.5	98	13	14:44
June	27.7	17.7	57	8	15:27
July	30	19.9	46	7	15:10
August	29.5	19.8	62	8	14:02
September	25	15.9	98	9	12:34
October	20.3	12	83	9	11:04
November	14.2	7.2	103	12	9:40
December	10.4	3.4	67	10	8:55

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around San Marino, Ancona is 5 days earlier and Arezzo 28 days later.

City	Distance	Date	Difference
Rimini	16 km	25 April – 22 August	same day
Ravenna	56 km	23 April – 22 August	2 days earlier
Arezzo	70 km	23 May – 1 August	28 days later
Perugia	92 km	9 May – 5 August	14 days later
Ancona	93 km	20 April – 21 August	5 days earlier
Florence	97 km	3 May – 7 August	8 days later

Where to buy tomato plants and seeds near San Marino

Buy plants ready to set out from 25 April to 22 August (from 4 April to 22 August for an unheated greenhouse); seed for raising your own is sown from 11 February to 1 July. Within 15 km of San Marino OpenStreetMap lists 8 garden centres, 5 farm-supply shops, 1 plant nursery, 1 market and 4 farm shops (collected 20 October 2026).

I 2 Riccioli Verdi — garden centre
Via Trasversale Marecchia, 47822 Santarcangelo di Romagna · Mon–Sat 08:00–12:30, 14:30–19:00; Sun 08:30–12:30 · 11 km · vivaioiduericcioliverdi.com
Fratelli Pesaresi — garden centre
Via Marecchiese 663, 47923 Rimini · 8 km · vivaiopesaresi.com
Vivai Fabbri — garden centre
Via Sarzana 2, 47923 Rimini · 12 km · vivaifabbri.it
Tropical Vivaio — garden centre
Via della Grotta Rossa 172, 47923 Rimini · 13 km

Each window starts on the Greenly calendar date and ends on the last day that still leaves the crop’s days to harvest (from its card) before the average first autumn frost, plus six weeks of picking for crops harvested over weeks (tomatoes, peppers, aubergines, cucumbers, courgettes, pumpkins, watermelons, beans) — our rule; earlier in the window is safer.

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