Why this spring’s frost risk sits late in the season
Dry soils and clear nights are pushing the last frosts into October across the tablelands. Here’s what the models are seeing, week by week.
In short
- Frost risk stays above normal until late October.
- Valley floors and low paddocks are most exposed.
- Set alerts at 2°C to give yourself time to act.
Most years, the last damaging frost on the tablelands lands in the second half of September. This year our models are holding meaningful risk well into October, and on some paddocks into the first week of November.
What’s different this year
Two things stack up. Soils dried out through a warm, low-rainfall winter, and dry ground gives up its heat quickly after sunset. And the pattern of cold fronts followed by high pressure has been slow to break, which brings exactly the clear, still nights that frost needs.
A clear, still night after a cold front is the frost signal. This spring we’re seeing more of them, later.
What the models are seeing
Our forecast blends forty years of station observations with the major global models. When those sources agree, confidence is high. For October they mostly do: cooler than usual overnight minimums across the ranges, with the strongest signal on valley floors where cold air pools.
Chance of a frost night, by week
8 Sep
15 Sep
22 Sep
29 Sep
6 Oct
13 Oct
20 Oct
27 Oct
Week by week
Risk stays above normal through mid-October and only drops back to average in the last week of the month. The table and alerts in Flowershift update daily, so treat the chart as the shape of the season, not a booking calendar.
What to do about it
- Hold off on frost-sensitive plantings on low ground until the risk drops.
- Set a frost alert at 2°C, not 0°C: leaf temperature runs colder than the screen.
- Check the overnight forecast for wind. Even a light breeze can keep frost off.