The threat of frost for Australian farmers against the background of a strengthening El Niño

Radiational frost typically occurs after a cold, clear, and calm night. The lack of clouds and dry soil accelerate heat loss, while heavy cold air accumulates in lowlands and valleys, forming so-called "frost pockets". If the forecasted minimum temperature is 3°C or lower, there is a risk of frost, as the soil surface may drop below 0°C.

Severe frosts cause the water inside plant cells to freeze and rupture, inflicting irreparable damage or destroying the plants. For grain crops such as wheat, barley, and oats, the greatest danger is damage to reproductive structures during flowering, which can completely deprive farmers of a harvest overnight.

To mitigate risks, farmers can choose crop cultivars with flowering outside the main frost period, identify potential frost pockets, monitor short-term weather warnings, and inspect fields after cold nights. The Birchip Cropping Group reported successful crop development in northwestern Victoria following a wet start to winter, but the Bureau of Meteorology of Australia issued warnings nationwide, and minor damage has already been reported in the southern Mallee and Wickepin North (Western Australia).

Authorities in Australia and the Pacific region can support producers by funding local weather stations, as well as continuing investments in research to find cultivars resistant to frost, drought, and extreme heat. While the highland communities of Papua New Guinea struggle to save the remainder of their harvest, Australian farmers have a chance to avoid the worst consequences of frost provided there is continued government funding for forecasting and research and development.