September in Canberra is spring, when warm-season crops go in once frost risk has passed. Here’s exactly what to sow from seed, plant as seedlings, and harvest this month in a cool temperate climate, tuned to Canberra’s frosts and temperatures, not a generic national calendar.
Typical Temps
1-31°C
winter low to summer high
Frost
April-October (regular frosts; heavy frosts June-August)
Climate Zone
Cool Temperate
Australian Capital Territory
Frost watch: Canberra has the harshest frosts of any Australian capital, April right through to November, with heavy frosts June-August. Frost-sensitive crops can't go out until after Melbourne Cup; start them indoors from late August. See frost dates for every city →
Canberra's last frost is typically around late September-early October, never plant frost-sensitive crops (tomatoes, beans, zucchini) outside before mid-October.
The short frost-free window in Canberra means starting tomatoes, capsicum, and basil indoors from late August is essential to get a decent harvest before April frosts.
Canberra's low humidity and sunny summers make it excellent for disease-free tomatoes, far less fungal disease than coastal cities.
Mulch heavily in Canberra to buffer the extreme temperature swings, beds can go from 25°C to below zero within a day in spring and autumn.
From the makers
This calendar tells you what's possible in September, Plant Planner tells you exactly how many of each crop to grow for your family, how to arrange them in your beds, and sends reminders so you never miss a window.
In September, Canberra gardeners can sow Tomato (indoors), Peas (outdoors), Broad Beans, Spinach, Beetroot, Carrot and more from seed, and plant out Peas (cold frame), Onion seedlings, Leek, Kale as seedlings. Canberra sits in the Cool Temperate climate zone, so these picks are timed to local conditions.
September falls in spring, when warm-season crops go in once frost risk has passed. In Canberra, expect winter lows around 1°C and summer highs near 31°C. Canberra has the harshest frosts of any Australian capital, April right through to November, with heavy frosts June-August. Frost-sensitive crops can't go out until after Melbourne Cup; start them indoors from late August.
Yes, September is a suitable window to start or plant tomatoes in Canberra. Give them full sun, support, and consistent watering. See the full month-by-month calendar for the rest of the season.
In a Canberra garden, September typically brings harvests of Broad Beans, Kale, Silverbeet, Leek, Broccoli (side shoots), Carrot. Actual timing depends on when each crop was planted.