Last Frost Date Vaughan — April 26 (Zone 6b)
Last frost date Vaughan: April 26 for the central core (Zone 6b). Thornhill/Concord south runs 2–3 days earlier; Maple/Kleinburg/Vellore Village north 3–5 days later.
Last frost date Vaughan 2026: April 26 (Zone 6b). Thornhill, Concord (south): April 23–26. Maple, Vellore Village (north): April 28–May 2. Kleinburg (NW): April 30–May 4. Wait until May 5–15 to transplant tomatoes, peppers, and basil. Source: Environment and Climate Change Canada (1991–2020).
Vaughan Neighbourhoods
| Area | Last Frost |
|---|---|
| Thornhill (south, bordering Toronto) | April 23–26 |
| Concord (south-central) | April 24–27 |
| Woodbridge (south) | April 24–27 |
| Vaughan Mills / Highway 7 corridor | April 26–30 |
| Maple (north-central) | April 28–May 2 |
| Vellore Village (north) | April 28–May 2 |
| Kleinburg (northwest) | April 30–May 4 |
Vaughan can drop to -3°C in late April. A 2.4×9m frost blanket protects an entire raised bed.
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Frequently Asked Questions
What is the last frost date in Vaughan?
Vaughan's last spring frost date is April 26 for the central core — Zone 6b. This is the historical 50th-percentile average from Environment and Climate Change Canada climate normals (1991–2020). South Vaughan (Thornhill, Concord, south Woodbridge) runs 2–3 days earlier (April 23–26) thanks to closer Lake Ontario moderation and urban heat island. North Vaughan (Maple, Kleinburg, Vellore Village, north Woodbridge) runs 3–5 days later (April 30–May 4) because they sit further from Lake Ontario at slightly higher elevation. The full historical range spans April 12 (earliest recorded) to May 12 (latest).
When can I plant tomatoes in Vaughan?
Wait until May 5–15 to transplant tomatoes, peppers, basil, beans, and squash in Vaughan. North Vaughan (Maple, Kleinburg, Vellore Village) should wait until May 8–18. Cool-season crops (lettuce, peas, brassicas) can be direct sown from late March. Victoria Day weekend (third Monday of May) is the GTA's traditional safe-transplant deadline. The growing season is approximately 180 days — long enough for full-season vegetables including indeterminate tomatoes, peppers, sweet corn, and winter squash.
What is the last frost date in Woodbridge, Maple, Kleinburg, and Concord?
Vaughan neighbourhoods vary by latitude and proximity to Lake Ontario's moderating effect. Thornhill (south, bordering Toronto): April 23–26. Concord (south-central): April 24–27. Woodbridge (south): April 24–27. Vaughan Mills / Highway 7 corridor: April 26–30. Maple (north-central): April 28–May 2. Vellore Village (north): April 28–May 2. Kleinburg (northwest): April 30–May 4. Rural Vaughan/Caledon-King border: May 5–12.
What growing zone is Vaughan?
Vaughan is officially Zone 6b for the central and southern parts under the Canadian Plant Hardiness Zone system. South Vaughan (Thornhill, Concord, south Woodbridge) sits in the warmer end of Zone 6b. North Vaughan (Maple, Kleinburg, Vellore Village) is the cooler end of Zone 6b. Rural King Township to the immediate north is Zone 6a. A Zone 6 plant will reliably overwinter anywhere in Vaughan; Zone 7 plants survive most years in south Vaughan but die in severe polar-vortex winters.
How do I protect plants from late frost in Vaughan?
Late frost in Vaughan can drop to -3°C in worst cases. Floating row cover (Reemay, Agribon) over transplants protects to about -3°C and is the GTA workhorse. Cloches or inverted pots over individual seedlings for predicted overnight frosts. Heavy mulch around transplants. Plant tender crops in the warmest spot — south-facing fence, against a heat-radiating brick wall. Don't transplant tender crops if nights below 3°C are forecast through May 10. Available at Sheridan Nurseries Vaughan, Plant Paradise Country Gardens, Home Depot, Loblaws Garden Centre, Canadian Tire.
How does Vaughan's last frost compare to other GTA cities?
Vaughan's April 26 last frost is slightly later than Toronto and Mississauga thanks to its position north of Lake Ontario. Compared to other GTA cities: 6 days later than Toronto and Mississauga (April 20), 3 days later than Hamilton (April 23), same as Markham (April 28), 2 days earlier than Brampton (April 28), 4 days earlier than Newmarket (May 2), 13 days earlier than Barrie (May 9). Vaughan's growing season is approximately 180 days — about 10 days shorter than Toronto's but adequate for full-season vegetables.
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