Spray Day Calculator
Check if weather conditions are suitable for crop spraying at your location. Calculations based on DEFRA and HSE spray application guidelines.
Select Your Location
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.
How long must it stay dry after spraying? Check your product label for "rainfastness" or "rain-free interval". Default: 6 hours.
Some products require a minimum temperature (e.g. "do not apply below 8°C"). Check your product label. Default: 5°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).
Keep learning
New to data-driven farming? Read our complete guide to precision agriculture in the UK, see what precision farming actually costs, or take the free interactive introduction course — story-driven, narrated, and cited to AHDB and gov.uk.