Tomatoes and cucumbers in an unheated greenhouse

Frost and heat thresholds

• ≤ 2.0 °C night frost risk — cover, close vents, delay planting.
• < 8.0 °C nights too cool for reliable tomato/cucumber planting.
• ≥ 30.0 °C day heat — vent, shade, water early.

When to plant by region

The (climate twin) mark means the date comes from a climate twin: a region abroad with a comparable growing climate (e.g. Minnesota/US), because Estonian-sourced data for that crop is not available yet. Treat it as a guide and check it against local experience. Estonian-sourced dates have no mark.

Next 7 days — greenhouse risk

Greenhouse risks for the next 7 days below — based on the MET Norway forecast.

• Cool night on 21 Oct (~2.4 °C): hold tomato/cucumber planting until nights hold above 8 °C.
• Cool night on 22 Oct (~3.4 °C): hold tomato/cucumber planting until nights hold above 8 °C.
• Cool night on 23 Oct (~4.2 °C): hold tomato/cucumber planting until nights hold above 8 °C.
• Cool night on 24 Oct (~7.3 °C): hold tomato/cucumber planting until nights hold above 8 °C.
• Cool night on 25 Oct (~6.8 °C): hold tomato/cucumber planting until nights hold above 8 °C.
• Cool night on 27 Oct (~7.8 °C): hold tomato/cucumber planting until nights hold above 8 °C.