Is Pouring Concrete in Winter for Footings Safe in the UK?

Pouring concrete in winter for footings can be carried out safely in the UK, but only when temperatures, ground conditions, and early curing protection are properly managed. The main risk is that the concrete freezes before it becomes strong enough, which can permanently weaken the foundations.

This is a common problem on many sites. The trench is ready, the concrete pumps are hired, and the weather looks good, but then temperatures drop overnight. Because footings are poured early and sit below ground, winter pours need extra care compared to warmer months. If conditions aren’t right, issues like cracks or movement can appear later, even if things look fine at first.

This guide explains how winter temperatures affect footing pours, why ground temperature matters as much as air temperature, and what to check before you start work.

Why Cold Weather Changes & How Concrete Footings Perform

Cold weather slows hydration and reduces the strength of concrete footings. The Concrete Society explains that if water within young concrete is allowed to freeze, the concrete can be damaged to the extent that it becomes unfit for use [1]. Even when temperatures stay above zero, concrete will not gain strength as quickly as it would in warmer months.

BS EN 13670 says concrete should stay above 5°C until it reaches at least 5 MPa of strength. This early strength is important because footings start carrying loads early in the build. In winter, concrete gains strength more slowly, so you may need to allow more time for curing and wait longer before removing formwork.

Ground conditions matter too. The Concrete Society says that anything touching fresh concrete, like the ground or formwork, should be a few degrees above freezing, ideally around 2°C. If you pour onto frozen ground or cold formwork, the concrete loses heat faster and is more likely to freeze or cure unevenly.

The Temperature Thresholds That Decide Whether a Pour Is Safe

When deciding if it's safe to pour concrete footings in winter, the main risk is often how you read the weather forecast. Many winter pours fail not because the weather was extreme, but because people didn't expect overnight frost.

The Met Office says ground frost can form even when air temperatures are between 0°C and 4°C, especially on clear, calm nights [2]. So, just because the forecast shows temperatures above zero, it doesn't mean the ground won't freeze. If you pour concrete late in the day, it could still freeze overnight, even if the daytime temperature was fine.

So, plan winter footing pours based on the lowest temperatures expected during curing, not just the daytime highs. Clear skies, light winds, and dry weather can all make the ground and fresh concrete lose heat quickly overnight.

In practice, you should only pour when:

• Overnight conditions are unlikely to produce ground frost
• Forecasts remain stable through the early curing period
• Protection is planned in advance, not relied on as a fallback

If you're not sure about the forecast, it's usually safer to wait before pouring.

How to Protect Footings During the Most Vulnerable Curing Period

If you go ahead with a winter footing pour, make sure protection is ready before the concrete arrives. The goal is to keep heat in the concrete and stop it from losing heat while it cures, especially overnight.

Effective protection measures include:

• Covering footings immediately after finishing with insulated curing blankets or temporary coverings
• Pouring earlier in the day to reduce exposure to falling evening temperatures
• Keeping excavations dry so that standing water does not freeze against fresh concrete
• Maintaining protection overnight until temperatures stabilise

Spending less time on site also reduces risk. If you can, use concrete pumping to place the concrete faster and more evenly during winter pours, especially on tight or large sites.

The Winter Footing Mistakes That Cause Problems Later On

Most problems with winter footings happen because of avoidable mistakes on site, like not checking temperatures enough or taking off protection too soon.

A key risk is pouring concrete onto frozen ground. LABC guidance states that concrete should not be placed where the ground is frozen, as thawing soil can change in volume and stability, leading to movement beneath the footing before sufficient strength is reached [3].

Other common mistakes in winter include:

• Failing to take regular temperature readings in shaded areas
• Ignoring wind chill and site exposure, which increase heat loss
• Removing insulation before early strength has developed
• Underestimating curing time, which may need to be extended by up to six days in extreme cold

LABC also says ready mixed concrete should stay above 5°C and be protected from freezing until it is strong enough. If you can't keep these conditions, it's usually safer to wait before pouring.

Getting Winter Footings Right Starts with the Right Advice

Whether you pour concrete footings in winter depends on how reliable the forecast is, the ground conditions, and if you can protect the concrete while it cures. Knowing when it's safe to pour and when it's better to wait helps you avoid delays and future problems.

Wright Readymix offers practical help for winter footing pours, whether for homes or businesses. We can advise on the right mix, delivery timing, and placement methods for cold weather. This support helps you deal with changing winter forecasts. Planning your quantities ahead with our concrete calculator can also help you avoid delays and keep fresh concrete from being left exposed.

Call 0117 958 2090 or get in touch to talk about your winter footing pour, check your quantities, and find the best concrete and delivery plan for your site.

External Sources

[1] The Concrete Society, “concrete can be damaged”: https://www.concrete.org.uk/fingertips/cold-weather-concreting/

[2] The Met Office, “between 0°C and 4°C”: https://weather.metoffice.gov.uk/learn-about/weather/types-of-weather/frost-and-ice

[3] LABC, “concrete should not be placed where the ground is frozen”: https://www.labc.co.uk/news/working-cold-weather