Last and first frost dates in Olsztyn

When is the last frost in Olsztyn?

The last frost in Olsztyn usually comes around 28 April: 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 7 April, while corn waits until 8 May. The first autumn frost follows around 16 November, about 202 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 Olsztyn

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 2 days before the last spring frost and 15 °C 24 days after it.

Frost dates near Olsztyn

Of the nearest cities on our list, the last spring frost ends earliest in Płock (10 April) and latest in Elbląg (30 April).

Seeds, seedlings and markets in Olsztyn

Within 15 km of Olsztyn OpenStreetMap lists 2 garden centres, 1 plant nursery, 5 markets and 2 farm shops (collected 28 October 2026). The nearest garden centre to the city centre is Olkwiat, 1 km away.

• Olkwiat — garden centre
  Stefana Okrzei 6, Olsztyn · 1 km · olkwiat.pl
• Szkółka Roślin "Topa" — plant nursery
  Sielska 45, 10-041 Olsztyn · 5 km · szkolkatopa.olsztyn.pl
• Targowisko przy ul. Kolejowej — market
  Mon–Sat 06:00–16:00 · 1 km · zdzit.olsztyn.eu
• Sklep Ogrodniczy — garden centre
  Mon, Wed–Thu 08:00–15:00; Tue, Fri 07:30–14:30; Sat 07:30–13:00; Sun closed · 1 km
• Targowisko przy ul. Grunwaldzkiej — market
  Tue, Fri, Sat 06:00–14:00 · 1 km · zdzit.olsztyn.eu
• Pchli targ "Flumark" — market
  Aleja Sybiraków, Olsztyn · Sun 9:00–15:00 · 2 km

• Where to buy seeds and seedlings in Olsztyn
• Selling your own harvest in Poland

Places: © OpenStreetMap contributors, ODbL.

Weather in Olsztyn by month

Average weather in Olsztyn over 2016–2025: the warmest month is August. Months that average 20 °C or more by day: June (22.8 °C), July (22.9 °C) and August (23.4 °C). Nights average below 0 °C in December–March (-3.5–-0.8 °C). About 701 mm of rain falls in a year, on 139 days; July is the wettest month (97 mm) and March the driest (41 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).