When to Plant Radishes in Charlottetown, PE
Published: April 24, 2026 · Updated: April 27, 2026
The fastest crop in the garden — ready in 22–30 days. Direct sow 4–6 weeks before last frost and succession plant every 2 weeks for a continuous spring harvest.
Charlottetown's Canadian Zone 6a (USDA 5b) Island Maritime climate has cool springs, warm humid summers, and moderate falls. Surrounded by the Gulf of St. Lawrence which moderates temperature extremes. 172 frost-free days and sandy loam soil create ideal conditions for root vegetables.
Radishes Planting Calendar for Charlottetown
Direct sow outdoors: March 27–April 6
Harvest window: April 18 – April 26
Minimum soil temperature: 4°C (40°F)
Days to harvest: 22–30 days
Sun requirement: Full sun to partial shade
Fall crop planting: September 15–25 (harvest October 7)
⚠ Direct sow radishes 4–6 weeks before last frost — one of the fastest crops in the garden. Ready in as little as 22 days. Succession plant every 2 weeks for continuous harvest.
Charlottetown Climate Notes
PEI is Canada's potato capital — growing potatoes here connects to the island's agricultural identity. Island cool maritime summers are ideal for root vegetables. Sandy loam soil drains well and warms faster than mainland clay soils, giving PEI gardens a head start in spring that partially offsets the cool summers.
Growing Tips for Radishes
- Thin to 2-inch spacing when seedlings are an inch tall — crowded radishes produce small woody roots.
- Succession plant every 10–14 days from early spring through late spring for continuous harvest.
- Plant as a row marker for slow-germinating crops like carrots — radishes sprout in days and mark the rows.
- Harvest promptly at target size; over-mature radishes turn pithy, woody, and unpleasantly hot.
Companion Planting in Charlottetown
Pair radish with Lettuce, Carrot, Pea, Cucumber for mutual benefit. Avoid planting near Hyssop, Grape, which compete with or inhibit radish growth.
Pests and Problems to Watch in Charlottetown
The most common pest and disease pressure on radishes in Charlottetown comes from Flea Beetle, Cabbage Root Maggot, Aphid. Floating row covers through the first 4–6 weeks after planting block adult pests from laying eggs, and a weekly scouting routine catches infestations before they damage the crop.
Frequently Asked Questions
When do I plant radish in Charlottetown?
Charlottetown's last spring frost is around May 1. Direct sow March 27–April 6.
What Canadian hardiness zone is Charlottetown?
Charlottetown is in Canadian Zone 6a (USDA equivalent 5b). The Island Maritime climate delivers 172 frost-free days from May 1 to October 20, which shapes every planting date in the local calendar.
How long is Charlottetown's growing season?
Charlottetown has 172 frost-free days — from May 1 in spring to October 20 in fall. That is more than enough time to finish a full radish crop (22–30 days to maturity) before the first fall frost.
Can I grow radish in containers in Charlottetown?
Yes. Container growing on balconies and decks is practical in Charlottetown — choose a 5-gallon or larger dark-coloured container to warm the root zone, use a high-quality potting mix, and water daily during hot summer weather. In milder climates, containers extend both spring and fall windows by several weeks.
What is the first fall frost in Charlottetown?
Charlottetown's average first fall frost is October 20. For a fall radish crop, plant around September 15–25 so plants mature before the first killing frost.