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Spray Day Calculator

Check if weather conditions are suitable for crop spraying at your location. Calculations based on DEFRA and HSE spray application guidelines.

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Product Settings Optional

If your product label specifies weather restrictions, enter them below. The calculator will use these instead of the defaults. Leave blank to use standard values.

hours

How long must it stay dry after spraying? Check your product label for "rainfastness" or "rain-free interval". Default: 6 hours.

°C

Some products require a minimum temperature (e.g. "do not apply below 8°C"). Check your product label. Default: 5°C.

°C

Some products must not be applied above a certain temperature (e.g. "avoid application above 25°C"). Check your product label. Default: 30°C (PPP Code).