Spray Drift Buffer & Keep It On Target
Protects neighbours
Enter wind speed, boom height and droplet type to get a downwind no-spray buffer, a drift risk level and a practical advisory to protect what lies downwind.
Enter spray conditions
Keep the downwind buffer and use coarser droplets near sensitive areas.
Next: follow the advisory — use coarser droplets, lower the boom, spray in calm conditions (ideally 3–10 km/h), and never spray above ~15 km/h.
A practical field guide, not a legal buffer; follow the product label and local regulations, which may mandate specific no-spray distances.
Spray drift — key facts
- Drift rises with
- wind, boom height, fine droplets
- Ideal wind
- 3–10 km/h
- Never spray above
- ≈ 15 km/h
- Cut drift
- coarse / air-induction nozzles
- Lower the boom
- less time to drift
- Buffer
- downwind no-spray gap
- Note
- field guide, not a legal buffer
- Privacy
- Runs in your browser; nothing uploaded
Spray on target, not on your neighbour
Every drop that drifts is a drop that didn't protect your crop — and may land somewhere it shouldn't. Spray drift rises with wind speed, with boom and nozzle height, and with fine droplets that hang in the air. The defence is a downwind no-spray buffer sized to the conditions, so that water, beehives, homes and sensitive neighbouring crops stay clear of what you apply. Getting that gap right protects your reputation, your licence to operate, and the people and habitats around your field.
This tool turns the conditions into a plan: a downwind buffer distance, a drift risk level and a practical advisory. Reduce drift with coarser droplets, a lower boom, and spraying in calm conditions — ideally a light 3–10 km/h breeze, and never above about 15 km/h. Coarse and air-induction nozzles cut drift sharply. This is a practical field guide, not a legal buffer: always follow the product label and local regulations, which take priority. Pair it with the Sprayer Calibration and Pre-Harvest Interval tools to apply right and apply safely.
Protect downwind
Size a buffer for water, bees and neighbours.
Read the conditions
Wind and boom height set today's drift risk.
Pick low-drift nozzles
Coarse and air-induction droplets cut drift fast.
Know when to wait
An advisory tells you to spray, adjust or hold.
Frequently Asked Questions
What is spray drift?+
Spray drift is the movement of pesticide droplets away from the target area during or shortly after application, carried by wind. It wastes product, reduces the dose on your crop, and can land on neighbours' fields, waterways, hedgerows and homes. Managing drift protects both your results and everyone downwind, which is why a no-spray buffer matters.
What makes drift worse?+
Three big factors: wind speed, boom or nozzle height, and droplet size. Faster wind carries droplets further; a higher boom gives them longer to drift; and fine droplets stay airborne far longer than coarse ones. Hot, dry conditions add evaporation, shrinking droplets in flight. The calculator weighs these to size the downwind buffer.
How is the buffer distance estimated?+
The tool combines wind speed, boom height, droplet/nozzle type and the sensitivity of what's downwind into a downwind no-spray buffer distance, with a risk level and a plain-language advisory. It's a practical field guide for planning a safe gap on the downwind edge — not a substitute for the label or local rules, which always take priority.
What wind speed is safe for spraying?+
Ideal conditions are a light, steady breeze of about 3–10 km/h — enough to show wind direction but gentle enough to limit drift. Dead calm risks temperature inversions that trap and move spray unpredictably, while above roughly 15 km/h drift becomes hard to control and you should stop. The advisory flags when conditions are outside the safe band.
How does droplet size affect drift?+
Droplet size is the single biggest factor you control. Fine droplets drift far; coarse droplets fall quickly onto the target. Switching to coarse or air-induction (low-drift) nozzles cuts drift sharply with little loss of efficacy for most products. The tool lets you reflect your nozzle choice, which can shrink the required buffer significantly.
Why does boom height matter?+
The higher the spray is released, the longer droplets are exposed to wind before they reach the target, so drift rises with boom height. Keeping the boom as low as good coverage allows — matched to your nozzle spacing and angle — reduces drift markedly. Lowering the boom is one of the simplest, cheapest ways to bring the buffer down.
What does the risk level mean?+
The risk level summarises how drift-prone the planned application is, given your wind, boom height, droplets and the sensitivity downwind. A higher risk means a wider buffer and stronger caution — or a reason to wait for better conditions or change your setup. It's a quick read on whether to spray now, adjust, or hold off.
What counts as a sensitive area downwind?+
Anything you must not contaminate: water bodies and drainage, homes, schools, beehives, organic or sensitive neighbouring crops, hedgerows and habitat. The more sensitive the downwind feature, the larger the buffer the tool advises. Knowing what lies downwind before you start is as important as reading the weather.
Is this buffer legally binding?+
No. This is a practical field guide to help you spray responsibly — it is not a legal buffer. Mandatory no-spray distances are set by the product label and by local and national regulations, and those always take precedence. Use this tool to plan and to err on the safe side, then follow the label and the law.
How else can I reduce drift?+
Spray in calm conditions, use coarse or air-induction nozzles, keep the boom low, reduce spray pressure, slow your travel speed, and add a downwind buffer or unsprayed headland. Drift-reducing adjuvants and shielded booms help too. Combining several of these lets you spray more often within a safe window while protecting everything downwind.