Frosts arrive later in spring and earlier in autumn across Pomerania, Warmia-Masuria, and Podlaskie. This calendar maps sowing and transplant windows to the actual conditions in those regions — not average all-Poland dates.
The table below shows typical sowing (indoors or outdoors), transplant, and harvest windows for the northern Polish lowlands. Dates assume last frost between 10–25 May depending on exact location.
| Crop | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Note |
|---|---|---|---|---|---|---|---|---|---|
| Carrots | Direct sow; cold soil delays germination below 8°C | ||||||||
| Tomatoes | Start indoors; transplant after 20 May in Warmia | ||||||||
| Kohlrabi | Two sowings possible; bolt-resistant varieties for northern use | ||||||||
| Peas | Tolerates light frost; sow as soon as soil workable | ||||||||
| Lettuce | Succession-sow every 3 weeks for continuous supply | ||||||||
| Onions (sets) | Sets preferred over seed in short seasons; 10 cm spacing | ||||||||
| Radishes | Fast crop; avoid sowing in summer heat — bolts quickly | ||||||||
| Beetroot | Sensitive to frost; delay outdoors until after 10 May | ||||||||
| Kale | Frost improves sweetness; hardy through October in northern Poland |
Detailed notes on timing, variety selection, and site-specific conditions across the northern Polish lowlands.
Carrots need consistent soil temperatures above 8°C to germinate reliably. In Warmia-Masuria and Podlaskie, that window opens later than in central Poland — and the harvest window is shorter.
Read article →
Brassicas tolerate frost but react badly to heat bolting. Choosing the right varieties and using row covers extends the practical growing window in regions with under 160 frost-free days.
Read article →
The transition from indoors to outdoors is the most critical phase of the short-season garden. Transplant timing by crop for Pomeranian and Masurian conditions, including hardening-off notes.
Read article →According to IMGW historical data, the average last spring frost in the Warmia-Masuria region falls between 10–20 May — up to three weeks later than in Silesia or the Lublin uplands. Sowing dates from national calendars often assume conditions from central or southern Poland.
IMGW climate data →Northern Polish lowlands typically have 150–165 frost-free days per year, compared with 180–200 days further south. This affects variety choice (shorter maturity times), sowing strategy (more indoor starts), and the feasibility of second sowings in late summer.
Season extension methods →Much of Pomerania and Masuria has light sandy soils that warm up quickly in spring — an advantage for early carrot and radish sowing. However, they also lose heat rapidly, which matters for late-season crops trying to finish before October frosts.
Soil notes for carrots →For crops like tomatoes and peppers, selecting varieties with 60–75 day maturity rather than 90-day types is practical in the north. The RHS and Polish seed catalogues both note regional suitability for northern climates in their variety descriptions.
RHS tomato guide →Questions about regional conditions or corrections to calendar dates can be submitted below.