Gardening in Mount Pearl, Newfoundland
Avalon Peninsula · Cool maritime, slightly inland
Mount Pearl is just inland from St. John's and its climate is very similar. It gets slightly less ocean influence, and its higher, open ground can hold cold air and catch the wind. The nearest frost reference, St. John's West, points to a season that runs a little shorter than at St. John's airport.
Growing season and frost
- Typical last spring frost
- Late May to mid June
- average ~Jun 1
- Typical first fall frost
- Mid September to mid October
- average ~Oct 11
- Average frost-free season
- ~131 days
Ranges show the middle half of years: in roughly one year in four, the last frost comes later than the range, so keep cover handy.
Frost data: Environment Canada climate normals 1981–2010, nearby St. John's West CDA station. Checked 2026-10-04. Mount Pearl has no station of its own. St. John's West (the agricultural research station on the city's western edge) is the closest inland reference. Historical averages are guidance, not a forecast for this year.
How the season is changing
The Climate Atlas of Canada estimates St. John's's frost-free season at about 154 days (1976–2005), with projections well beyond that by mid-century. For gardeners that means more room for warm crops over time, but also hotter spells and heavier rain to plan around. These figures are for St. John's and are a close reference for Mount Pearl.
| St. John's | 1976–2005 | 2051–2080 (range) |
|---|---|---|
| Frost-free season | 154 | ~200 (167 to 238) |
| Below-zero days per year | 163 | ~103 (63 to 137) |
| Days above +25 °C per year | 8 | ~33 (10 to 61) |
| Typical hottest summer day | 26.9 °C | ~30.3 °C (27.7 °C to 33.0 °C) |
| Typical coldest winter day | -17.8 °C | ~-12.0 °C (-16.6 °C to -7.9 °C) |
| Summer precipitation | 267 mm | ~277 mm (176 mm to 394 mm) |
| Winter precipitation | 408 mm | ~462 mm (354 mm to 580 mm) |
Source: Climate Atlas of Canada, St. John's city report (Version 2.0, March 2019), high-carbon (RCP8.5) scenario. Explore the frost days map. These are modelled climate estimates, not a forecast. They differ slightly from the station frost averages above because they use a different period and method. Use the station frost dates for planting this year.
Local gardening challenges
- Late spring frosts on clear, calm nights, especially in low spots near brooks and ponds.
- Wind across open subdivisions and higher streets.
- Damp, foggy spells that encourage slugs and blight.
Wind and exposure
Open subdivisions and higher elevations can be windy; fences and houses make a real difference. Low spots near brooks and ponds can collect cold air on clear spring nights.
What tends to grow well
- Potatoes and root crops
- Brassicas such as kale and cabbage
- Lettuce and peas
- Garlic and onions
Needs more strategy
- Tomatoes and zucchini do better with the shelter of a wall or fence
- Peppers and cucumbers are most reliable under cover
How Mount Pearl differs
Compared with St. John's airport, the St. John's West reference has its last spring frost a few days later and its first fall frost a little earlier. Plan for a slightly tighter window, and don't rush tender plants out.
Right now in Mount Pearl
Checking today's date…
See everything you can plant nowCrop guides for Mount Pearl gardeners
- Growing Potatoes in Newfoundland & Labrador
- Growing Carrots in Newfoundland & Labrador
- Growing Tomatoes in Newfoundland & Labrador
- Growing Garlic in Newfoundland & Labrador
Nearby: Gardening in St. John's · Gardening in Paradise
Your yard isn't average.
Get a plan for your sun, wind and setup in Mount Pearl. No account needed.
Plan My GardenLocal advice on this page is awaiting review by an experienced Mount Pearl gardener.