Last Frost Date Burlington — April 22 (Zone 6b/7a)
Last frost date Burlington: April 22 for the central core (Zone 6b/7a). Aldershot, Roseland lakeshore approach Zone 7a; Niagara Escarpment north (Alton Village, Headon) runs slightly later.
Last frost date Burlington 2026: April 22 (Zone 6b/7a). Aldershot, Roseland (lakeshore): April 17–20. Tyandaga, Brant Hills (central): April 19–22. Alton Village, Headon (above Escarpment): April 25–30. Wait until May 1–10 to transplant tomatoes. Source: Environment and Climate Change Canada (1991–2020).
Burlington Neighbourhoods
| Area | Last Frost |
|---|---|
| Aldershot (lakeshore west, near RBG) | April 17–20 (Zone 7a) |
| Roseland, LaSalle Park | April 17–20 |
| Downtown waterfront, Brant Hills south | April 18–21 |
| Tyandaga (south central) | April 19–22 |
| Plains Road corridor, central | April 20–23 |
| Tyandaga north / Mount Nemo | April 24–27 |
| Alton Village (above Escarpment) | April 25–28 |
| Headon, Burlington Highlands rural | April 25–May 5 |
Burlington rarely drops below -2°C in late spring. A 2.4×9m frost blanket protects an entire raised bed for occasional late frosts.
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Frequently Asked Questions
What is the last frost date in Burlington?
Burlington's last spring frost date is April 22 for the central core — Zone 6b. This is the historical 50th-percentile average from Environment and Climate Change Canada climate normals (1991–2020). Lakeshore neighbourhoods (Aldershot, Roseland, downtown waterfront, LaSalle Park area) run 3–5 days earlier (April 17–20) thanks to Lake Ontario moderation, approaching Zone 7a. North Burlington on the Niagara Escarpment (Tyandaga north, Alton Village, Headon) runs 3–5 days later (April 25–30) because of higher elevation. The full historical range spans April 8 (earliest) to May 7 (latest).
When can I plant tomatoes in Burlington?
Wait until May 1–10 to transplant tomatoes, peppers, basil, beans, and squash in Burlington's central and lakeshore neighbourhoods. North Burlington (Alton Village, Headon, above the Escarpment) should wait until May 5–15. Cool-season crops can be direct sown from mid-to-late March. Burlington's growing season is approximately 195 days — among the longest in Canada outside coastal BC, supporting reliable cultivation of heat-loving crops including heirloom tomatoes, peppers, eggplant, sweet potatoes, and winter squash.
What is the last frost date in Aldershot, Roseland, Tyandaga, and Alton Village?
Burlington neighbourhoods vary by distance from Lake Ontario and the Niagara Escarpment. Aldershot (lakeshore west, near RBG): April 17–20 (Zone 7a). Roseland, LaSalle Park area: April 17–20. Downtown waterfront, Brant Hills south: April 18–21. Tyandaga (south central): April 19–22. Burlington central / Plains Road corridor: April 20–23. Tyandaga north / Mount Nemo area: April 24–27. Alton Village (north, above Escarpment edge): April 25–28. Headon (north): April 25–30. Rural Halton Hills border / Burlington Highlands: April 28–May 5.
What growing zone is Burlington?
Burlington is officially Zone 6b for the central core under the Canadian Plant Hardiness Zone system. The lakeshore neighbourhoods (Aldershot, Roseland) create pockets of Zone 7a thanks to direct Lake Ontario moderation and the Royal Botanical Gardens proximity. North Burlington on or above the Niagara Escarpment drops to the cooler end of Zone 6b approaching Zone 6a. The Royal Botanical Gardens itself uses Burlington's mild lakeshore climate to grow tender plants that struggle elsewhere in Ontario. A Zone 6 plant overwinters reliably anywhere in Burlington; Zone 7 plants survive most years in lakeshore pockets.
How do I protect plants from late frost in Burlington?
Late frost in Burlington is rare and rarely intense thanks to Lake Ontario moderation — temperatures rarely drop below -2°C even in late spring cold snaps. Floating row cover (Reemay, Agribon) over transplants protects to about -3°C. Cloches or inverted pots over individual seedlings. Heavy mulch around transplants. Plant tender crops in the warmest spot — south-facing fence, lakeshore-side garden, against a heat-radiating brick wall. Available at Connon Nurseries Burlington, Sheridan Nurseries Burlington, Royal Botanical Gardens plant sales, Home Depot, Canadian Tire.
How does Burlington's last frost compare to other Halton Region cities?
Burlington's April 22 last frost matches Oakville and beats Milton by several days thanks to closer Lake Ontario proximity. Compared to GTA cities: same as Oakville (April 22), 2 days later than Toronto and Mississauga (April 20), 1 day earlier than Hamilton (April 23), 4 days earlier than Vaughan (April 26), 6 days earlier than Brampton (April 28), 13 days earlier than Milton (around May 5 due to Escarpment elevation). Burlington's 195-day growing season is among the longest in Canada and supports reliable harvests of every common vegetable plus tender perennials.
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