Laval, QC — Planting Guide
Laval is in USDA Zone 6b. The average last spring frost is April 13 and the first fall frost is October 17, giving you a growing season of approximately 187 days.
At an elevation of 98 ft, Laval receives approximately 31.4 in of rainfall annually. Summer highs average 79°F with winter lows around 23°F. The predominant soil type is Gray-Brown Podzol.
🌡️ Zone
6b (-5°F to 0°F min)
❄️ Last Frost
April 13
🍂 First Frost
October 17
📅 Growing Season
187 days
⛰️ Elevation
98 ft
🌧️ Annual Rainfall
31.4 in
Monthly Watering Calendar for Laval
When you'll need to water your garden — based on average monthly rainfall vs. the ~1 inch/week most gardens need.
For new gardeners: Most vegetables want about 1 inch of water per week. Laval gets 31" a year — months that hit that 1"/week need zero supplemental watering; months that fall short, the table tells you how much to add. Saves you from drowning roots and from drought-stressing plants into bolting.
View detailed monthly data
| Month | Avg Rainfall | Rainy Days | Extra Water Needed | Watering Effort |
|---|---|---|---|---|
| Jan | 1.2 in | 7 days | — | None |
| Feb | 1.4 in | 6 days | — | None |
| Mar | 2.3 in | 7 days | 2 in | High |
| Apr | 2.8 in | 9 days | 1.5 in | Moderate |
| May | 3.4 in | 11 days | 0.9 in | Moderate |
| Jun | 3.9 in | 11 days | 0.4 in | Low |
| Jul | 3.9 in | 9 days | 0.4 in | Low |
| Aug | 2.9 in | 9 days | 1.4 in | Moderate |
| Sep | 3 in | 7 days | 1.3 in | Moderate |
| Oct | 2.8 in | 7 days | 1.5 in | Moderate |
| Nov | 2 in | 8 days | — | None |
| Dec | 1.9 in | 8 days | — | None |
Annual total: 31.5 in. Water needs vary by crop — tomatoes need ~1.2"/week while herbs like rosemary need only 0.3"/week. Check individual plant pages for crop-specific water budgets that factor in your county's rainfall and soil drainage.
Laval Soil Profile
Soil Type
Gray-Brown Podzol
Soil pH
6.0-7.0
Drainage
Well Drained
Gardening Difficulty Score
Laval is a very forgiving place to garden. Most plants thrive here with minimal effort.
Local Gardening Help in Laval
Free expert help is closer than you think. Your county's cooperative extension office connects you with trained gardeners, soil testing labs, and local programs — all specific to Laval's climate and soil.
County Extension Office
Laval Extension Office
Extension offices are run by land-grant universities and funded by the USDA. Their advice is free, research-based, and tailored to your county's specific conditions.
Master Gardener Program
Free gardening help from trained volunteers
Master Gardeners are community volunteers who complete 40–60 hours of university horticultural training. They answer gardening questions, diagnose plant problems, and offer workshops — all free.
Many extension offices run a Master Gardener hotline where you can call or email with photos of plant problems for free diagnosis.
Soil Testing
Available through your extension office
Before amending your soil, get it tested. Your extension office offers soil testing (typically $10–$25) that tells you exact pH, nutrient levels, and amendment recommendations specific to what you want to grow.
Services Available in Laval
Finding local nurseries & garden centers in Laval
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Laval's soil and climate that big-box stores can't. Plants from local growers are typically hardier because they're already acclimated to your zone.
How to Find Them
Search for "nurseries near Laval QC" or "garden center Laval" on Google Maps. Also check with your extension office — they often maintain lists of reputable local nurseries and plant sales.
Community gardens & gardening groups
Community gardens are a great way to learn from experienced gardeners in your area, especially if you're limited on space. Search "community garden Laval QC" or check your extension office and local parks department. Facebook groups like "Laval Gardeners" or "Quebec Gardening" are also excellent for local advice and plant swaps.
What to Plant After Your Harvest
After your first crops finish, use the remaining frost-free days to grow a second round.
Show 6 more succession options
Sunlight & Day Length in Laval
Monthly daylight hours and peak sun — critical for onion varieties, photoperiod-sensitive plants, and solar garden planning.
What this means for you: Day length is the trigger that tells lettuce, spinach, and cilantro to bolt. In Laval, knowing when that day-length threshold arrives helps you plant a final round in time to harvest before it bolts.
Longest Day
15.5 hours
Summer solstice daylight
Shortest Day
8.5 hours
Winter solstice daylight
Peak Sun Hours
9.5 hr/day peak (summer)
Peak sun hours (green dashed line below) account for cloud cover — this is the usable direct sunlight your garden actually receives. Most vegetables need 6+ peak sun hours.
Onion tip: Your long summer days (14+ hours) support long-day onion varieties like Walla Walla, Sweet Spanish, and Ailsa Craig.
View detailed monthly data
| Month | Daylight Hours | Peak Sun Hours | Day Length |
|---|---|---|---|
| January | 8.9 hr | 3.4 hr | Short day |
| February | 10.1 hr | 4.3 hr | Short day |
| March | 11.6 hr | 5.6 hr | Short day |
| April | 13.3 hr | 6.7 hr | Neutral |
| May | 14.7 hr | 8.6 hr | Long day |
| June | 15.5 hr | 9.2 hr | Long day |
| July | 15.2 hr | 9.5 hr | Long day |
| August | 13.9 hr | 8.5 hr | Neutral |
| September | 12.3 hr | 6.9 hr | Neutral |
| October | 10.7 hr | 5.6 hr | Short day |
| November | 9.2 hr | 3.6 hr | Short day |
| December | 8.5 hr | 3.4 hr | Short day |
Peak sun hours factor in typical cloud cover — use these for solar panel and shade-planning calculations.
Soil Temperature & Composting in Laval
Monthly soil temps tell you when to plant warm-season crops, and when your compost pile is actively working.
Why it matters: Compost piles need 130-160°F internal temp to actively break down. Below 50°F ambient, microbial activity slows dramatically. Laval's soil temperature curve also tells you when your compost is working and when it's napping.
Plant Warm Crops When
Soil reaches 60°F+
Soil warm enough from May through Oct.
Best Month to Compost
Jun
Microbial activity peaks when soil is warm.
Active Composting
6 months
Solid season. Piles go dormant in winter.
View detailed monthly data
| Month | Soil 4" Deep | Soil 8" Deep | Compost Activity | Time to Finish |
|---|---|---|---|---|
| Jan | 29°F | 37°F | ❄️ Dormant | ~36 weeks |
| Feb | 31°F | 36°F | ❄️ Dormant | ~36 weeks |
| Mar | 39°F | 40°F | ❄️ Dormant | ~36 weeks |
| Apr | 49°F | 49°F | 🐢 Slow | ~24 weeks |
| May | 61°F | 60°F | ♻️ Active | ~14 weeks |
| Jun | 72°F | 69°F | 🔥 Peak | ~8 weeks |
| Jul | 81°F | 75°F | 🔥 Peak | ~8 weeks |
| Aug | 80°F | 77°F | 🔥 Peak | ~8 weeks |
| Sep | 75°F | 73°F | 🔥 Peak | ~8 weeks |
| Oct | 64°F | 64°F | ♻️ Active | ~14 weeks |
| Nov | 47°F | 55°F | 🐢 Slow | ~24 weeks |
| Dec | 37°F | 45°F | ❄️ Dormant | ~36 weeks |
Highlighted rows = soil 60°F+ (safe for warm-season transplants). Compost finishes fastest during peak activity months.
Pest & Disease Pressure in Laval
Computed from local climate patterns — warmer, humid conditions increase pest generations and fungal disease risk.
For new gardeners: The most successful gardeners in high-pressure regions don't spray more — they design around the problem. Crop rotation, companion planting, and resistant varieties beat reactive spraying.
Insect Pest Pressure
Moderate — common pests appear but manageable with monitoring.
Disease Risk
Low disease risk — dry conditions reduce fungal problems.
Seasonal Risk
View 6 common pests in your area
| Pest | Risk Level | Peak Months |
|---|---|---|
| Aphids | High | Apr, May, Jun, Jul, Aug, Sep |
| Japanese beetles | Moderate | Jun, Jul, Aug |
| Squash vine borers | Moderate | Jun, Jul |
| Tomato hornworms | Moderate | Jun, Jul, Aug |
| Cucumber beetles | Low | May, Jun, Jul |
| Stink bugs | Low | Jun, Jul, Aug, Sep |
Organic pest management tips
- Maintain healthy soil with regular compost additions to build natural pest resistance
- Practice crop rotation annually to break pest cycles
- Encourage beneficial insects with flowering herbs like dill, fennel, and yarrow
Cover Crops for Laval
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with planting dates calibrated for your area.
What this means for you: The "chop and drop" approach to cover crops: cut them down right before flowering, let them lay on the surface as mulch, plant your vegetables through the mulch. Less work, healthier soil.
Spring Cover Crops (3 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | Apr 17 | Aug 8 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Sorghum-sudan grass | Apr 17 | Aug 15 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Mar 17 | Aug 15 | ✓ Yes | Living mulch, fixes nitrogen, permanent ground cover |
Summer Cover Crops (1 options) — Fill gaps and suppress weeds between plantings
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Sunflowers | Apr 24 | Sep 19 | — | Deep roots break compaction, attract pollinators and beneficial insects |
Fall Cover Crops (7 options) — Plant after harvest to protect soil over winter
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Austrian winter peas | Aug 25 | Mar 23 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Crimson clover | Aug 19 | Mar 30 | ✓ Yes | Fixes nitrogen, attracts pollinators in spring |
| Daikon radish | Aug 23 | Mar 23 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Jul 23 | Mar 30 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Sep 22 | Mar 30 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jul 11 | Mar 30 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jul 27 | Mar 23 | — | Erosion control, weed suppression, good biomass |
Wind & Microclimate in Laval
For new gardeners: A 10 mph wind doesn't feel like much, but it triples leaf transpiration vs. still air. Laval's 8.3 mph average means most days are gentle on plants, but consider how a 20+ mph spring gust would affect a flat of seedlings hardened off too quickly.
Wind dries soil, stresses plants, and affects frost patterns. Understanding your exposure helps with garden placement.
Seasonal Wind Speed
Spring: 11 mph Summer: 8 mph
Fall: 10 mph Winter: 11 mph
Prevailing wind: SW. Moderate wind — consider a temporary windbreak for young seedlings.
Windbreak Benefit
5.1/10
Moderately beneficial — a simple fence or trellis can protect delicate crops from wind stress.
Frost Pocket Risk
Low
Relatively flat terrain (82 ft range). Frost pocket risk is minimal — garden placement is flexible.
Rainwater Harvesting in Laval
How much water you can collect, when to collect it, and what size system you need for your garden.
Why it matters: Most gardens use 0.5-1 gallon per square foot per week in summer. Laval's 31" annual rainfall is enough to cover most needs if you can capture it. Rain barrels under downspouts are the simplest entry point.
Annual Collection
15,699 gal
Per 1,000 sq ft of roof area (at 80% collection efficiency)
Recommended Setup
6 rain barrels (55 gal each)
For a typical 500 sq ft garden. Serious collectors: consider a 1,750 gal tank.
Legal Status
Unrestricted
Rainwater harvesting is fully legal in your state with no restrictions.
Best Collection Months
May, Jun, Jul, Sep
Highest rainfall months — your barrels will fill up quickly during these months.
Months to Draw From Storage
Jan, Feb, Dec
Dry months when you'll rely on stored water — size your storage for this gap.
Rainwater collection tips for your area
- Your county receives approximately 31.5 inches of rain per year
- A 1,000 sq ft roof can collect roughly 15,699 gallons annually
- Rainwater harvesting is fully legal in your state
- Stock up on stored water before your dry season (Jan, Feb, Dec)
- Use a first-flush diverter to keep roof debris out of your collection
Soil & Growing Conditions in Laval
Soil Type
Gray-Brown Podzol
Amend with compost each season to maintain fertility and structure.
Watering Needs
Moderate rainfall (31.4 in.) — plan to water 1–2 times per week during the growing season.
Season Tips
187-day frost-free season
Plenty of time for warm-season crops. Start heat-lovers indoors 6–8 weeks before last frost to maximise your harvest window.
Your Free Printable Garden Planner
Plan every bed, every planting, every harvest — in one place. This 22-page printable includes your zone's planting calendar, a month-by-month task list, a seed inventory tracker, a harvest log, and succession-planting charts. Built to print, write in, and actually use all season.
Recommended for Your Garden
Test your soil pH, nitrogen, phosphorus, and potassium levels before planting.
Get instant, accurate soil pH readings to fine-tune your amendments.
Boost soil fertility and structure with rich, well-aged organic compost.
Monthly Planting Guide for Laval
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Laval.
Frequently Asked Questions
What planting zone is Laval, QC?
Laval is in USDA Hardiness Zone 6b. This zone classification determines which perennial plants survive winter and sets the baseline for frost timing across the county.
When is the last frost in Laval, QC?
Based on 30 years of NOAA weather station data, the median last spring frost in Laval falls around April 13. Plan transplants and direct-sow dates relative to this date.
When is the first fall frost in Laval, QC?
The median first fall frost in Laval arrives around October 17. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
Is Laval a good location for home gardening?
Laval scores 95/100 (Excellent) on our Microclimate Index, which combines frost reliability, drought pressure, soil challenge, elevation risk, and long-term climate trend. This is an above-average location for home gardening with relatively predictable growing conditions.
Your Laval Garden Planner — Free
A 22-page printable planner built for Laval (Zone 6b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.
The Gardener's Encyclopedia to Companion Planting
The pairings that make vegetables, herbs, and flowers grow better — and the ones that quietly wreck a bed.
- Proven pairings for 200+ vegetables, herbs, flowers, and fruits
- Full seed-starting + planting schedule with timing and spacing
- Bonus: square-foot gardening guide + printable seasonal planners
Seed Saving & Storage Guide
Most saved seeds go bad before next season. This shows exactly when to pick, how to dry, and where to store seeds from 200 plants so yours don't.
- 200 plants, step-by-step: life cycle, pollination type, isolation
- Exact temperature + humidity ranges that keep seeds viable
- Bonus: searchable Google Sheets tracker + custom GPT assistant
Composting Guide for Homesteaders
Turn kitchen scraps and yard waste into compost that actually feeds the garden — instead of a pile that smells, attracts pests, and never breaks down.
- 14 sections on composting methods, soil science, and troubleshooting
- The 7-step hot-compost system from start to finish
- Bonus tools: troubleshooting chart, safety guide, monitoring log