Cool Temperate Zone in Australia (e.g. Southern Highlands of NSW)
This area typically experiences:
- Irregular frost during winter (approximately 10 times per season)
- Chilly spring mornings with mild days
- Extended spring and autumn with pleasant daytime temperatures (18–22°C)
- Very hot summers from December to March, with heatwaves often exceeding 35–38°C
- A limited window for cool-season crops during the hottest months
Comparable USDA Zones: 7a to 8a
In the US, this would roughly compare to:
- Zone 7a (average minimum temps: -17.8 to -15°C / 0 to 5°F)
- Zone 8a (average minimum temps: -12.2 to -9.4°C / 10 to 15°F)
Example US locations in Zones 7a–8a:
- Parts of the Pacific Northwest (e.g. Portland, Oregon suburbs)
- Northern Georgia
- Western North Carolina (e.g. Asheville)
- Some inland areas of California with elevation (e.g. Sierra Foothills)
- Eastern Tennessee (e.g. Knoxville area)
What This Means for US Gardeners:
If you’re in USDA Zones 7a to 8a, many of the planting tips and crop suggestions for the Southern Highlands will apply to your garden too:
- Use season extenders like row covers or greenhouses
- Adjust your warm-season crop timing based on heatwave patterns
- Make the most of long shoulder seasons (spring and autumn) for leafy greens, peas, and brassicas