Laval Planting Guide — Last Frost April 28
Laval's last spring frost averages April 28 and the first fall frost arrives around October 10, giving gardeners on Île Jésus approximately 165 days. Zone 6a conditions match Montreal's and suit a wide range of vegetables including full-season tomatoes, peppers, and winter squash. Start tomatoes indoors in late March and transplant after April 28 for a productive summer garden.
Laval Planting Calendar
Laval's 165-day Zone 6a season allows most common Canadian vegetables to thrive. Choose blight-resistant tomato varieties given Quebec's humid summers, and plan a fall lettuce and kale harvest after the main summer crops.
| Vegetable | Start Indoors | Transplant / Direct Sow | Notes |
|---|---|---|---|
| Tomatoes | Mar 17 – Apr 1 | After Apr 28 | Legend (68d), Defiant PhR (70d), Fantasio (70d) — blight-resistant |
| Peppers | Feb 18 – Mar 3 | After Apr 28 | California Wonder (75d), Islander (70d), Jalapeño (72d) |
| Cucumbers | Apr 14 – Apr 21 | After May 5 | Marketmore (65d), Bush Pickle (48d); direct sow preferred |
| Zucchini / Summer Squash | — | After May 5 | Direct sow; Black Beauty, Patio Star; prolific in Laval's warm season |
| Winter Squash | May 1 | After May 7 | Butternut (85d), Acorn (80d); start indoors for more time |
| Beans (Bush) | — | May 7 – Jun 15 | Provider (50d), Haricot jaune; direct sow after soil warms |
| Peas | — | Apr 8 – Apr 22 | Direct sow 3 weeks before last frost; Lincoln, Sugar Snap |
| Spinach | — | Apr 10 – May 1; again Aug 15 | Spring and fall crops; Bloomsdale Long Standing |
| Lettuce | — | Apr 14 – May 5; again Aug 10 | Spring and fall crops; shade in peak July heat |
| Kale / Swiss Chard | — | Apr 28 – May 10 | Season-long producers; harvest through frost in October |
| Broccoli / Cabbage | Mar 17 – Apr 1 | Apr 22 – May 5 | Excellent in Laval's climate; fall crop started July 1 |
| Brussels Sprouts | Mar 17 – Mar 24 | Apr 22 – Apr 28 | Sweetened by October frost; start early for heads by October |
| Carrots | — | Apr 28 – May 15 | Nantes types; sandy Île Jésus soils excellent for root vegetables |
| Beets | — | Apr 28 – Jun 1 | Detroit Dark Red, Chioggia; direct sow |
| Potatoes | — | May 1 – May 14 | Yukon Gold, Norland; harvest August–September |
| Garlic | — | Plant Oct 5 – Oct 18 | Hardneck varieties; Music, Porcelain; mulch with straw; harvest July 2027 |
Laval's Climate — Île Jésus Growing Conditions
Laval occupies Île Jésus, an island in the St. Lawrence river system north of Montreal, bounded by the Rivière des Prairies to the south and the Rivière des Mille Îles to the north. This island location, combined with Laval's status as Quebec's second-largest city and its significant urban heat island effect, creates a growing climate comparable to Montreal.
Annual precipitation averages about 950 mm, well distributed through the growing season. Quebec's humid continental climate means late August can bring late blight pressure to tomatoes and potatoes — management through variety selection and cultural practices (drip irrigation, good spacing) is important.
Île Jésus Soil — Sandy Loam for Root Vegetables
Laval's agricultural land historically supported market gardening for Montreal, and the island's soils reflect this heritage. Much of Laval's soil is sandy loam over calcareous parent material — well-drained, slightly alkaline, and excellent for root vegetables (carrots, parsnips, beets) and garlic. Test pH before starting; aim for 6.2–6.8 for most vegetables and add sulfur if above 7.0.
The well-drained sandy soils warm up quickly in spring, which can allow slightly earlier outdoor seeding of carrots and beets than in heavier clay soils further north. They also dry out faster — plan for irrigation during July dry spells.
Blight Management in Quebec's Humid Summers
Quebec's humid climate creates late blight pressure in tomatoes and potatoes each August. For Laval gardeners, choose blight-resistant tomato varieties as your first line of defence:
- Legend (68d) — Oregon State University breeding; excellent blight resistance, great flavour
- Defiant PhR (70d) — Ph-2 resistance gene; red beefsteak, productive
- Fantasio (70d) — European variety, strong field resistance to late blight
- Ferline (75d) — excellent resistance, good yield in Quebec conditions
- Juliet (60d) — cherry-plum type; fast-ripening before blight pressure peaks
Laval vs Nearby Cities — Frost Date Comparison
| City | Last Spring Frost | First Fall Frost | Season Length | Zone |
|---|---|---|---|---|
| Laval | Apr 28 | Oct 10 | ~165 days | 6a |
| Montreal | Apr 23 | Oct 12 | ~172 days | 6a |
| Quebec City | May 12 | Oct 1 | ~142 days | 5a |
| Ottawa | May 7 | Oct 9 | ~155 days | 5b/6a |
Laval and Montreal have very similar seasons. Montreal's downtown urban heat island gives it a slight edge; Laval's island position and extensive suburban green space create a very gardener-friendly Zone 6a climate.
Laval Gardening — Frequently Asked Questions
When is the last frost in Laval, Quebec?
Laval's average last spring frost is around April 28. For 90% frost-free confidence, wait until May 7–8 before transplanting tender crops. The island's urban density may allow slightly earlier planting in south-facing sheltered spots.
When is the first fall frost in Laval?
The first fall frost averages around October 10. Have row cover ready from late September for tomatoes, peppers, and basil. Late September cold snaps can be followed by warm weather — protect crops through one cold night and you may gain two more weeks of harvest.
What growing zone is Laval?
Laval is USDA Hardiness Zone 6a, matching Montreal. The Rivière des Prairies and Rivière des Mille Îles surrounding Île Jésus provide thermal moderation, keeping the island slightly warmer than inland Quebec at the same latitude.
How does Laval compare to Montreal for gardening?
Nearly identical conditions. Montreal's downtown urban heat island gives it a slight edge (last frost a few days earlier). Most Montreal planting advice applies directly to Laval. Laval has more open residential garden space, while Montreal gardeners often use rooftop and balcony containers.
When should I start tomatoes indoors in Laval?
Start tomatoes indoors March 17 – April 1. Transplant after April 28. Choose blight-resistant varieties: Legend (68d), Defiant PhR (70d), Fantasio (70d). Medium-season varieties (70–80d) are reliable in Laval's 165-day season.
Do I need blight-resistant tomatoes in Laval?
Recommended. Quebec's humid continental climate brings late blight pressure in August most years. Blight-resistant varieties (Legend, Defiant, Fantasio) protect your investment. Use drip irrigation and space plants 60–75 cm apart to reduce leaf wetness.
When can I plant peas and spinach in Laval?
Direct-sow peas and spinach from April 8–22. Both tolerate light frost. Sugar Snap peas do especially well in Laval's cool spring. Re-sow spinach in mid-August for a fall harvest through October.
What are the best tomato varieties for Laval?
Best blight-resistant choices: Legend (68d), Defiant PhR (70d), Ferline (75d). Cherry types: Juliet (60d), Sungold (65d). For standard slicers: Jet Star (72d), Fantasio (70d). All of these mature well within Laval's 165-day season.
When should I plant garlic in Laval?
Plant hardneck garlic from October 5–18, after the first cool spell but before the ground freezes (typically late November). Mulch with 10–15 cm of straw. Music and Porcelain-type hardnecks overwinter well in Zone 6a and harvest in late July.
🗺️ Plant in Other Canadian Cities Near Laval
Same country, different microclimates — compare planting dates with cities near you.
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