Last and first frost dates in Grenoble

When is the last frost in Grenoble?

The last frost in Grenoble usually comes around 5 May: that is the median of 2016–2025, so in about half of those years the last night at or below 0 °C came later. Hardy crops start before it and frost-tender ones only after it: in the table below arugula can go into open ground from 14 April, while corn waits until 30 May. The first autumn frost follows around 25 October, about 173 days later: harvest or cover frost-tender crops before then.

When to sow and plant

Planting out: a week after the last frost once the soil is warm enough for the crop; frost-hardy crops three weeks before it; an unheated greenhouse three weeks earlier. Seedlings are sown so they are ready on that day. 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.

When the soil warms up in Grenoble

The day the top 7 cm of soil first averages each temperature over a week, median of 2016–2025 (ERA5 via Open-Meteo). The soil reaches 10 °C 8 days after the last spring frost and 15 °C 46 days after it.

Frost dates near Grenoble

Of the nearest cities on our list, the last spring frost ends earliest in Valence (18 March) and latest in Annecy (15 April).

Seeds, seedlings and markets in Grenoble

Within 15 km of Grenoble OpenStreetMap lists 17 garden centres, 4 plant nurseries, 55 markets and 19 farm shops (collected 20 October 2026). The nearest garden centre to the city centre is La Centrale Jardinerie, 1 km away.

• La Centrale Jardinerie — garden centre
  Square Docteur Léon Martin 6, 38000 Grenoble · Tue–Wed, Fri–Sat 10:15–19:00; Thu 14:15–19:00 · 1 km
• Marché Saint-Bruno — market
  Tue–Sun 06:00–13:00 · 1 km
• Miellerie du Peuple Zélé — farm shop
  Route de Grenoble 8 bis · Wed 14:00–18:00 · 5 km · peuplezele.weebly.com
• Jardins Alternatifs — garden centre
  Mon 10:30–13:00, 14:00–18:30; Tue–Sat 09:30–13:00, 14:00–18:30 · 4 km · jardins-alternatifs-grenoble.com
• Marché de l'Estacade — market
  Tue–Sun 07:00–13:00 · 1 km
• La Ferme des Maquis — farm shop · sells: goat cheese
  Route des Maquis 165, 38400 Saint-Martin-d'Hères · Wed, Fri 16:00–19:00; Sat 10:00–12:00, 16:00–19:00 · 5 km · fermedesmaquis.fr

• Where to buy seeds and seedlings in Grenoble
• Selling your own harvest in France

Places: © OpenStreetMap contributors, ODbL.

Weather in Grenoble by month

Average weather in Grenoble over 2016–2025: the warmest month is August. Months that average 20 °C or more by day: June (20.6 °C), July (22.7 °C) and August (22.8 °C). Nights average below 0 °C in November–March (-5.1–-1 °C). About 1427 mm of rain falls in a year, on 143 days; November is the wettest month (156 mm) and July the driest (83 mm).

Average of the daily highs and lows, rain per month and days with at least 1 mm (ERA5 via Open-Meteo, the same grid cell as the frost dates).

Planted in autumn

From a month before the first autumn frost, so the roots grow before winter, to the late-planting limit on each crop’s page (about two weeks before the ground freezes, by ten years of weather).