Slurry Spreading Dates & Rules in Ireland: Closed Periods Explained

Spreading slurry outside the permitted season isn't just bad practice — it can breach the Nitrates Regulations and put your farm payments at risk. Ireland operates a closed period each winter when spreading organic fertilisers is prohibited, and the exact dates depend on which zone your farm is in. Here's what you need to know for the 2025/26 season.

Why there's a closed period

Over winter, grass isn't growing and soils are wet, so nutrients spread on land are far more likely to wash into watercourses than to feed a crop. The closed period exists to protect water quality and to make sure slurry is applied when the ground can actually use it. It's a core part of Ireland's Nitrates Action Programme.

The three zones

Ireland is split into three zones, and colder, wetter regions have a longer closed period. Your zone depends on your county — check with Teagasc or the Department of Agriculture (DAFM) if you're not sure which applies to you.

Reopening dates for 2026

For the start of the 2026 season, the closed period for slurry and farmyard manure ends on:

• Zone A: Tuesday, 13 January 2026
• Zone B: Friday, 16 January 2026
• Zone C: Sunday, 1 February 2026

Chemical fertiliser has its own, slightly later prohibited-period end dates:

• Zone A: Monday, 26 January 2026
• Zone B: Thursday, 29 January 2026
• Zone C: Saturday, 14 February 2026

The closed period runs across the winter into these dates, having begun in autumn (broadly early October to early November depending on zone). Because the exact start dates and zone boundaries can be updated, always confirm the current dates for your farm with DAFM or Teagasc before planning autumn spreading.

Just because you can, doesn't mean you should

The reopening date is a legal earliest date — not a signal to spread. You must still apply slurry only when ground and weather conditions are suitable. Do not spread when:

• The ground is waterlogged, flooded or frozen
• Heavy rain is forecast within 48 hours
• The land is steeply sloping toward water and conditions are wet

Spreading into poor conditions loses you nutrients, risks pollution, and can still land you in breach even inside the open season.

The rules that matter year-round

• Buffer zones: Keep the required distances back from watercourses, drains, wells and abstraction points.
• Low-emission slurry spreading (LESS): Many farms are now required to use LESS equipment such as a dribble bar, trailing shoe or injection. As well as being the rule, LESS captures more nitrogen from your slurry, so you get better value from every tank.
• Storage: You must have enough storage to hold slurry safely through the whole closed period. Check your capacity well before winter.
• Records: Keep records of applications as required under your nitrates obligations.

Plan your contractor around the calendar

Slurry contractors are in heavy demand in the days after each zone reopens and again in spring. If you rely on a contractor for umbilical, dribble-bar or trailing-shoe work, talk to them early so you're in the run when conditions come right — the weather window after reopening can be short.

Need slurry spread? Browse our directory for slurry and muck-spreading contractors in your county, including those running LESS equipment, and contact them directly.

This article is a general guide for the 2025/26 season and is not legal advice. Closed-period dates, zones and rules can change — always verify the current requirements for your farm with the Department of Agriculture (DAFM) or Teagasc.