Sarnia-Lambton, ON — Planting Guide
Sarnia-Lambton is in USDA Zone 7b. The average last spring frost is April 3 and the first fall frost is October 27, giving you a growing season of approximately 207 days.
At an elevation of 590 ft, Sarnia-Lambton receives approximately 39.1 in of rainfall annually. Summer highs average 84°F with winter lows around 32°F. The predominant soil type is Clay Loam.
🌡️ Zone
7b (5°F to 10°F min)
❄️ Last Frost
April 3
🍂 First Frost
October 27
📅 Growing Season
207 days
⛰️ Elevation
590 ft
🌧️ Annual Rainfall
39.1 in
Monthly Watering Calendar for Sarnia-Lambton
When you'll need to water your garden — based on average monthly rainfall vs. the ~1 inch/week most gardens need.
For new gardeners: The 1-inch-per-week rule applies to most vegetable crops. Sarnia-Lambton averages 39" a year — divide by 52 and compare to that 1" target. Some months are above, some below; that's where the calendar earns its keep.
View detailed monthly data
| Month | Avg Rainfall | Rainy Days | Extra Water Needed | Watering Effort |
|---|---|---|---|---|
| Jan | 1.7 in | 7 days | — | None |
| Feb | 1.8 in | 7 days | — | None |
| Mar | 2.7 in | 8 days | 1.6 in | High |
| Apr | 3.4 in | 10 days | 0.9 in | Moderate |
| May | 4.2 in | 10 days | 0.1 in | Low |
| Jun | 4.9 in | 9 days | — | Low |
| Jul | 4.2 in | 9 days | 0.1 in | Low |
| Aug | 3.6 in | 9 days | 0.7 in | Moderate |
| Sep | 4 in | 6 days | 0.3 in | Low |
| Oct | 3.2 in | 7 days | 1.1 in | Moderate |
| Nov | 3 in | 8 days | — | None |
| Dec | 2.5 in | 8 days | — | None |
Annual total: 39.2 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.
Sarnia-Lambton Soil Profile
Soil Type
Clay Loam
Soil pH
6.0-7.0
Drainage
Well Drained
Gardening Difficulty Score
Sarnia-Lambton is a very forgiving place to garden. Most plants thrive here with minimal effort.
Local Gardening Help in Sarnia-Lambton
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 Sarnia-Lambton's climate and soil.
County Extension Office
Sarnia-Lambton 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 Sarnia-Lambton
Finding local nurseries & garden centers in Sarnia-Lambton
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Sarnia-Lambton'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 Sarnia-Lambton ON" or "garden center Sarnia-Lambton" 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 Sarnia-Lambton ON" or check your extension office and local parks department. Facebook groups like "Sarnia-Lambton Gardeners" or "Ontario 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 Sarnia-Lambton
Monthly daylight hours and peak sun — critical for onion varieties, photoperiod-sensitive plants, and solar garden planning.
What this means for you: Onion varieties are sold by "short-day," "intermediate-day," and "long-day." Sarnia-Lambton's latitude determines which to buy — and getting it wrong is the difference between baseball-sized bulbs and marbles.
Longest Day
15.2 hours
Summer solstice daylight
Shortest Day
8.8 hours
Winter solstice daylight
Peak Sun Hours
9.3 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 | 9.2 hr | 3.7 hr | Short day |
| February | 10.3 hr | 4.4 hr | Short day |
| March | 11.6 hr | 5.6 hr | Short day |
| April | 13.2 hr | 6.9 hr | Neutral |
| May | 14.5 hr | 8.3 hr | Long day |
| June | 15.2 hr | 9.2 hr | Long day |
| July | 14.9 hr | 9.3 hr | Long day |
| August | 13.8 hr | 8.7 hr | Neutral |
| September | 12.3 hr | 6.9 hr | Neutral |
| October | 10.8 hr | 5.5 hr | Short day |
| November | 9.5 hr | 3.8 hr | Short day |
| December | 8.8 hr | 3.3 hr | Short day |
Peak sun hours factor in typical cloud cover — use these for solar panel and shade-planning calculations.
Soil Temperature & Composting in Sarnia-Lambton
Monthly soil temps tell you when to plant warm-season crops, and when your compost pile is actively working.
For new gardeners: Mulched soil swings less. The mulch insulates against both winter cold and summer heat. In Sarnia-Lambton, an aggressive mulch program shifts your effective soil temperature curve toward optimal for most crops.
Plant Warm Crops When
Soil reaches 60°F+
Soil warm enough from May through Oct.
Best Month to Compost
May
Microbial activity peaks when soil is warm.
Active Composting
8 months
Nearly year-round composting.
View detailed monthly data
| Month | Soil 4" Deep | Soil 8" Deep | Compost Activity | Time to Finish |
|---|---|---|---|---|
| Jan | 37°F | 44°F | ❄️ Dormant | ~36 weeks |
| Feb | 38°F | 44°F | ❄️ Dormant | ~36 weeks |
| Mar | 45°F | 47°F | 🐢 Slow | ~24 weeks |
| Apr | 55°F | 56°F | ♻️ Active | ~14 weeks |
| May | 66°F | 64°F | 🔥 Peak | ~8 weeks |
| Jun | 77°F | 72°F | 🔥 Peak | ~8 weeks |
| Jul | 84°F | 79°F | 🔥 Peak | ~8 weeks |
| Aug | 84°F | 82°F | 🔥 Peak | ~8 weeks |
| Sep | 81°F | 77°F | 🔥 Peak | ~8 weeks |
| Oct | 69°F | 70°F | 🔥 Peak | ~8 weeks |
| Nov | 56°F | 61°F | ♻️ Active | ~14 weeks |
| Dec | 45°F | 52°F | 🐢 Slow | ~24 weeks |
Highlighted rows = soil 60°F+ (safe for warm-season transplants). Compost finishes fastest during peak activity months.
Pest & Disease Pressure in Sarnia-Lambton
Computed from local climate patterns — warmer, humid conditions increase pest generations and fungal disease risk.
Quick context: Pollinators are the good bugs. Pest pressure is the bad bugs. Sarnia-Lambton's climate makes both more abundant in warm humid regions, and rarer in cold dry ones — plan habitat to encourage the good while managing the bad.
Insect Pest Pressure
Moderate — common pests appear but manageable with monitoring.
Disease Risk
High fungal/bacterial risk. Space plants for airflow, water at soil level.
Seasonal Risk
View 6 common pests in your area
| Pest | Risk Level | Peak Months |
|---|---|---|
| Aphids | High | Mar, Apr, May, Jun, Jul, Aug, Sep, Oct |
| Japanese beetles | Moderate | Jun, Jul, Aug |
| Squash vine borers | Moderate | May, Jun, Jul |
| Stink bugs | Moderate | May, Jun, Jul, Aug, Sep |
| Whiteflies | Low | Jun, Jul, Aug, Sep |
| Spider mites | Moderate | Jul, Aug |
Organic pest management tips
- Use row covers on susceptible crops during peak pest months
- Apply neem oil preventatively every 7-14 days during active pest season
- Interplant with strong-scented herbs (basil, marigold) to confuse pests
- Hand-pick larger pests (beetles, caterpillars) in early morning when they're sluggish
- Practice crop rotation — never plant the same family in the same spot within 3 years
- Watch for powdery mildew, downy mildew, blight — common in your climate
Cover Crops for Sarnia-Lambton
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with planting dates calibrated for your area.
Quick context: Why not just leave bare soil? Weed seeds, erosion, nutrient leaching, and crust formation. A cover crop solves all of these for the cost of seeds and one mowing.
Spring Cover Crops (4 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | Apr 12 | Sep 1 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Cowpeas (southern peas) | Apr 5 | Aug 18 | ✓ Yes | Excellent nitrogen fixer for warm climates, edible |
| Sorghum-sudan grass | Apr 11 | Aug 18 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Mar 7 | Aug 18 | ✓ 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 | May 4 | Oct 13 | — | 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 19 | Mar 20 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Crimson clover | Aug 18 | Mar 13 | ✓ Yes | Fixes nitrogen, attracts pollinators in spring |
| Daikon radish | Sep 6 | Mar 13 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Aug 12 | Mar 13 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Sep 15 | Mar 13 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jul 23 | Mar 13 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jul 29 | Mar 20 | — | Erosion control, weed suppression, good biomass |
Wind & Microclimate in Sarnia-Lambton
For new gardeners: Wind is the silent water thief. Every breeze pulls moisture from leaves and soil. Sarnia-Lambton's 8.5 mph average is one piece of the watering math: rainfall + irrigation must exceed evaporation + transpiration, and wind boosts both losses.
Wind dries soil, stresses plants, and affects frost patterns. Understanding your exposure helps with garden placement.
Seasonal Wind Speed
Spring: 12 mph Summer: 9 mph
Fall: 10 mph Winter: 12 mph
Prevailing wind: SW. Moderate wind — consider a temporary windbreak for young seedlings.
Windbreak Benefit
4.9/10
Moderately beneficial — a simple fence or trellis can protect delicate crops from wind stress.
Frost Pocket Risk
Low
Relatively flat terrain (142 ft range). Frost pocket risk is minimal — garden placement is flexible.
Rainwater Harvesting in Sarnia-Lambton
How much water you can collect, when to collect it, and what size system you need for your garden.
Why this matters: A 1,000 sq ft roof captures about 600 gallons from a single 1" rainfall. Sarnia-Lambton gets 39" of rain a year — a couple of well-placed rain barrels can cover most summer watering. In dry climates the math's even better: every captured gallon is one you don't buy.
Annual Collection
19,537 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 1,500 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 39.2 inches of rain per year
- A 1,000 sq ft roof can collect roughly 19,537 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 Sarnia-Lambton
Soil Type
Clay Loam
Retains moisture well but slow to warm in spring. Amend with compost to improve drainage.
Watering Needs
Moderate rainfall (39.1 in.) — plan to water 1–2 times per week during the growing season.
Season Tips
207-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
Cedar raised bed kit — ideal for poor soil, clay, or small-space gardening.
Improve drainage and aeration in heavy clay soils with horticultural perlite.
Premium blend of topsoil, compost, and perlite formulated for raised beds.
🥬 Vegetables to Grow in Sarnia-Lambton
112 vegetables that grow well in Zone 7b with planting dates for Sarnia-Lambton.
Show all 112 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Acorn Squash | Mar 6 | Apr 10 | Apr 17 | — | Jul 10 – Aug 14 | 80–100 |
| Amaranth | Feb 13 | Apr 10 | Apr 17 | — | Jul 17 – Sep 4 | 90–120 |
| Artichoke | — | — | Apr 17 | — | Aug 21 – Oct 30 | 120–180 |
| Arugula | Feb 27 | Mar 20 | Apr 3 | Aug 18 | May 8 – Jul 10 | 30–50 |
| Asparagus | — | — | Apr 17 | — | — | 730–1095 |
| Beets | — | Mar 20 | — | Aug 18 | May 15 – Jun 12 | 50–70 |
| Belgian Endive | Feb 27 | Mar 20 | Apr 3 | Aug 18 | Jul 24 – Sep 18 | 110–150 |
| Bitter Melon | Feb 13 | Apr 10 | Apr 17 | — | Jun 19 – Jul 31 | 60–90 |
| Black Beans | — | Apr 10 | — | — | Jul 10 – Aug 28 | 90–120 |
| Bok Choy | Feb 27 | Mar 20 | Apr 3 | Aug 18 | May 15 – Jun 19 | 40–60 |
| Broccoli | Feb 27 | Mar 20 | Apr 3 | Aug 18 | Jun 5 – Jul 17 | 60–90 |
| Broccoli Rabe | Feb 27 | Mar 20 | Apr 3 | Aug 18 | May 15 – Jun 19 | 40–60 |
| Brussels Sprouts | Feb 27 | Mar 20 | Apr 3 | Aug 18 | Jul 3 – Aug 28 | 90–130 |
| Butternut Squash | Mar 6 | Apr 10 | Apr 17 | — | Jul 17 – Aug 21 | 85–110 |
| Cabbage | Feb 27 | Mar 20 | Apr 3 | Aug 18 | Jun 5 – Jul 31 | 60–100 |
| Calabash | Feb 13 | Apr 10 | Apr 17 | — | Jul 10 – Sep 4 | 80–120 |
| Cardoon | — | — | Apr 17 | — | Aug 21 – Oct 2 | 120–150 |
| Carrots | — | Mar 20 | — | Aug 18 | May 22 – Jun 26 | 60–80 |
| Cauliflower | Feb 27 | Mar 20 | Apr 3 | Aug 18 | May 29 – Jul 31 | 55–100 |
| Celeriac | Feb 27 | Mar 20 | Apr 3 | Aug 18 | Jul 17 – Aug 21 | 100–120 |
| Celery | Feb 27 | Mar 20 | Apr 3 | Aug 18 | Jun 26 – Aug 21 | 80–120 |
| Celtuce | Feb 27 | Mar 20 | Apr 3 | Aug 18 | Jun 5 – Jul 17 | 60–90 |
| Chard | Feb 27 | Mar 20 | Apr 3 | Aug 18 | May 29 – Jul 17 | 50–60 |
| Chayote | Feb 13 | Apr 10 | Apr 17 | — | Aug 21 – Oct 30 | 120–180 |
| Chickpeas | Feb 27 | Mar 20 | Apr 3 | Aug 18 | Jun 26 – Aug 7 | 80–110 |
| Chicory | Feb 27 | Mar 20 | Apr 3 | Aug 18 | Jun 5 – Jul 17 | 60–85 |
| Chinese Cabbage | Feb 27 | Mar 20 | Apr 3 | Aug 18 | May 29 – Jun 26 | 50–70 |
| Christmas Lima Beans | Feb 13 | Apr 10 | Apr 17 | — | Jul 10 – Aug 14 | 80–100 |
| Collard Greens | Feb 27 | Mar 20 | Apr 3 | Aug 18 | May 29 – Jul 31 | 55–75 |
| Corn | — | Apr 10 | — | — | Jun 12 – Aug 7 | 60–100 |
| Cowpeas | — | Apr 10 | — | — | Jun 12 – Jul 24 | 60–90 |
| Cress | Feb 27 | Mar 20 | Apr 3 | Aug 18 | Apr 17 – May 8 | 14–21 |
| Crookneck Squash | Mar 6 | Apr 10 | Apr 17 | — | Jun 5 – Jul 3 | 45–60 |
| Crosne | — | Mar 20 | — | Aug 18 | Aug 21 – Oct 23 | 150–200 |
| Cucumber | Mar 6 | Apr 10 | Apr 17 | — | Jun 12 – Aug 7 | 50–70 |
| Daikon | — | Mar 20 | — | Aug 18 | May 15 – Jun 12 | 50–70 |
| Delicata Squash | Mar 6 | Apr 10 | Apr 17 | — | Jul 10 – Aug 14 | 80–100 |
| Edamame | — | Apr 10 | — | — | Jun 26 – Aug 7 | 75–100 |
| Eggplant | Jan 30 | Apr 10 | Apr 17 | — | Jun 26 – Aug 28 | 65–85 |
| Endive | Feb 27 | Mar 20 | Apr 3 | Aug 18 | May 22 – Jun 26 | 45–65 |
| Escarole | Feb 27 | Mar 20 | Apr 3 | Aug 18 | May 29 – Jun 26 | 50–70 |
| Fava Beans | Feb 27 | Mar 20 | Apr 3 | Aug 18 | Jun 19 – Jul 31 | 75–100 |
| Fennel | Feb 13 | Apr 10 | Apr 17 | — | Jun 19 – Jul 31 | 60–90 |
| Garlic | — | — | — | Sep 15 | Dec 15 – Apr 27 | 90–240 |
| Green Beans | — | Apr 10 | — | — | Jun 5 – Jul 31 | 50–65 |
| Horseradish | — | — | Apr 17 | — | Aug 21 – Oct 30 | 120–180 |
| Hot Peppers | Jan 30 | Apr 10 | Apr 17 | — | Jun 26 – Oct 2 | 70–120 |
| Hubbard Squash | Mar 6 | Apr 10 | Apr 17 | — | Jul 31 – Sep 4 | 100–120 |
| Jicama | Feb 13 | Apr 10 | Apr 17 | — | Aug 21 – Oct 30 | 120–180 |
| Kabocha | Mar 6 | Apr 10 | Apr 17 | — | Jul 17 – Aug 14 | 85–100 |
| Kai Lan | Feb 27 | Mar 20 | Apr 3 | Aug 18 | May 22 – Jun 19 | 45–60 |
| Kale | Feb 27 | Mar 20 | Apr 3 | Aug 18 | May 29 – Jul 24 | 50–70 |
| Kidney Beans | — | Apr 10 | — | — | Jul 10 – Aug 14 | 85–110 |
| Kohlrabi | Feb 27 | Mar 20 | Apr 3 | Aug 18 | May 22 – Jun 26 | 45–65 |
| Komatsuna | Feb 27 | Mar 20 | Apr 3 | Aug 18 | May 8 – Jun 12 | 35–50 |
| Leeks | Feb 27 | Mar 20 | Apr 3 | Aug 18 | Jul 3 – Sep 18 | 90–150 |
| Lentils | Feb 27 | Mar 20 | Apr 3 | Aug 18 | Jun 26 – Aug 7 | 80–110 |
| Lettuce | Feb 27 | Mar 20 | Apr 3 | Aug 18 | May 8 – Jul 17 | 30–60 |
| Lima Beans | — | Apr 10 | — | — | Jun 12 – Jul 24 | 60–90 |
| Loofah | Feb 13 | Apr 10 | Apr 17 | — | Jul 31 – Oct 2 | 100–150 |
| Luffa | Feb 13 | Apr 10 | Apr 17 | — | Jul 17 – Oct 2 | 90–150 |
| Mache | Feb 27 | Mar 20 | Apr 3 | Aug 18 | May 15 – Jun 19 | 40–60 |
| Malabar Spinach | Feb 13 | Apr 10 | Apr 17 | — | Jun 12 – Jul 10 | 55–70 |
| Melon | Mar 6 | Apr 10 | Apr 17 | — | Jun 26 – Aug 14 | 70–100 |
| Microgreens | Feb 27 | Mar 20 | Apr 3 | Aug 18 | Apr 10 – May 8 | 7–21 |
| Mitsuba | Feb 27 | Mar 20 | Mar 27 | Aug 18 | May 22 – Jul 17 | 50–70 |
| Mizuna | Feb 27 | Mar 20 | Apr 3 | Aug 18 | May 8 – Jun 5 | 30–45 |
| Mustard Greens | Feb 27 | Mar 20 | Apr 3 | Aug 18 | May 8 – Jul 10 | 30–50 |
| Napa Cabbage | Feb 27 | Mar 20 | Apr 3 | Aug 18 | May 29 – Jul 3 | 55–75 |
| New Zealand Spinach | Feb 13 | Apr 10 | Apr 17 | — | Jun 12 – Jul 10 | 55–70 |
| Okra | Feb 13 | Apr 10 | Apr 17 | — | Jun 12 – Aug 7 | 50–65 |
| Onion | Feb 27 | Mar 20 | Apr 3 | Aug 18 | Jul 3 – Aug 21 | 90–120 |
| Pac Choi | Feb 27 | Mar 20 | Apr 3 | Aug 18 | May 15 – Jun 12 | 40–55 |
| Parsnip | — | Mar 20 | — | Aug 18 | Jul 3 – Aug 14 | 100–130 |
| Patty Pan Squash | Mar 6 | Apr 10 | Apr 17 | — | Jun 5 – Jul 3 | 45–60 |
| Peas | Feb 27 | Mar 20 | Apr 3 | Aug 18 | May 29 – Jul 24 | 55–70 |
| Peppers | Jan 30 | Apr 10 | Apr 17 | — | Jun 19 – Aug 28 | 60–90 |
| Pole Beans | Feb 13 | Apr 10 | Apr 17 | — | Jun 12 – Aug 7 | 55–70 |
| Potatoes | Feb 13 | Apr 10 | Apr 17 | — | Jun 26 – Sep 4 | 70–120 |
| Pumpkin | Mar 6 | Apr 10 | Apr 17 | — | Jul 17 – Sep 4 | 85–120 |
| Purslane | Feb 27 | Mar 20 | Apr 3 | Aug 18 | May 15 – Jun 19 | 40–60 |
| Radicchio | Feb 27 | Mar 20 | Apr 3 | Aug 18 | Jun 5 – Jul 10 | 60–80 |
| Radish | — | Mar 20 | — | Aug 18 | Apr 17 – May 8 | 22–35 |
| Rhubarb | — | — | Apr 24 | — | — | 365–730 |
| Romanesco | Feb 27 | Mar 20 | Apr 3 | Aug 18 | Jun 19 – Jul 31 | 75–100 |
| Rutabaga | — | Mar 20 | — | Aug 18 | Jun 12 – Jul 17 | 80–100 |
| Salsify | — | Mar 20 | — | Aug 18 | Jul 3 – Aug 14 | 100–130 |
| Savoy Cabbage | Feb 27 | Mar 20 | Apr 3 | Aug 18 | Jun 12 – Aug 7 | 70–110 |
| Scallions | Feb 27 | Mar 20 | Apr 3 | Aug 18 | May 29 – Jun 26 | 50–70 |
| Scarlet Runner Beans | Feb 13 | Apr 10 | Apr 17 | — | Jun 19 – Jul 24 | 60–80 |
| Shallot | Feb 27 | Mar 20 | Apr 3 | Aug 18 | Jul 3 – Aug 21 | 90–120 |
| Shiso | Feb 13 | Apr 10 | Apr 17 | — | Jun 12 – Aug 7 | 50–70 |
| Snap Peas | Feb 13 | Apr 10 | Apr 17 | — | Jun 12 – Aug 7 | 55–70 |
| Snow Peas | Feb 27 | Mar 20 | Apr 3 | Aug 18 | May 29 – Jul 24 | 50–65 |
| Soybeans | — | Apr 10 | — | — | Jul 3 – Aug 28 | 80–120 |
| Spaghetti Squash | Mar 6 | Apr 10 | Apr 17 | — | Jul 17 – Aug 14 | 85–100 |
| Spinach | Feb 27 | Mar 20 | Apr 3 | Aug 18 | May 8 – Jul 10 | 35–50 |
| Squash (Summer) | Mar 6 | Apr 10 | Apr 17 | — | Jun 5 – Aug 7 | 45–65 |
| Squash (Winter) | Mar 6 | Apr 10 | Apr 17 | — | Jul 10 – Sep 4 | 80–120 |
| Sunchoke | — | — | Apr 17 | — | Aug 7 – Oct 2 | 110–150 |
| Sweet Corn | — | Apr 10 | — | — | Jun 12 – Jul 24 | 60–90 |
| Sweet Potatoes | Feb 13 | Apr 10 | Apr 17 | — | Jul 17 – Sep 4 | 90–120 |
| Tatsoi | Feb 27 | Mar 20 | Apr 3 | Aug 18 | May 8 – Jun 12 | 35–50 |
| Tomatillo | Feb 13 | Apr 10 | Apr 17 | — | Jun 19 – Aug 28 | 60–85 |
| Tomatoes | Feb 13 | Apr 10 | Apr 17 | — | Jun 19 – Aug 28 | 60–85 |
| Turnip | — | Mar 20 | — | Aug 18 | May 1 – Jun 5 | 40–60 |
| Watercress | Feb 27 | Mar 20 | Apr 3 | Aug 18 | May 15 – Jun 19 | 40–60 |
| Watermelon | Mar 6 | Apr 10 | Apr 17 | — | Jun 26 – Aug 14 | 70–100 |
| Wax Beans | — | Apr 10 | — | — | Jun 5 – Jul 31 | 50–65 |
| Winter Melon | Feb 13 | Apr 10 | Apr 17 | — | Jul 17 – Sep 4 | 90–120 |
| Yard Long Beans | Feb 13 | Apr 10 | Apr 17 | — | Jun 12 – Jul 24 | 55–80 |
| Zucchini | Mar 6 | Apr 10 | Apr 17 | — | Jun 5 – Jul 31 | 45–60 |
🍓 Fruits to Grow in Sarnia-Lambton
31 fruits that grow well in Zone 7b with planting dates for Sarnia-Lambton.
Show all 31 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Alpine Strawberries | — | — | Apr 24 | — | Jul 24 – Nov 6 | 90–180 |
| Aronia | — | — | Apr 24 | — | — | 730–1095 |
| Blackberries | — | — | Apr 24 | — | — | 365–730 |
| Blueberries | — | — | Apr 24 | — | — | 730–1095 |
| Boysenberries | — | — | Apr 24 | — | — | 365–730 |
| Cantaloupe | — | — | Apr 24 | — | Jul 3 – Aug 7 | 70–90 |
| Che Fruit | — | — | Apr 24 | — | — | 1095–1825 |
| Cranberries | — | — | Apr 24 | — | — | 730–1095 |
| Currants | — | — | Apr 24 | — | — | 730–1095 |
| Elderberries | — | — | Apr 24 | — | — | 730–1095 |
| Figs | — | — | Apr 24 | — | — | 730–1825 |
| Goji Berries | — | — | Apr 24 | — | — | 730–1095 |
| Gooseberries | — | — | Apr 24 | — | — | 730–1095 |
| Grapes | — | — | Apr 24 | — | — | 730–1095 |
| Ground Cherry | — | — | Apr 24 | — | Jul 3 – Aug 28 | 65–80 |
| Hardy Kiwi | — | — | Apr 24 | — | — | 1095–1825 |
| Haskaps | — | — | Apr 24 | — | — | 730–1095 |
| Honeydew | — | — | Apr 24 | — | Jul 17 – Aug 28 | 80–110 |
| Jostaberry | — | — | Apr 24 | — | — | 730–1095 |
| Kiwi | — | — | Apr 24 | — | — | 1095–1825 |
| Lingonberries | — | — | Apr 24 | — | — | 730–1095 |
| Loquat | — | — | Apr 24 | — | — | 730–1825 |
| Medlar | — | — | Apr 24 | — | — | 1095–1825 |
| Mulberries | — | — | Apr 24 | — | — | 730–1825 |
| Pawpaw | — | — | Apr 24 | — | — | 1095–2555 |
| Persimmon | — | — | Apr 24 | — | — | 1095–2555 |
| Pomegranate | — | — | Apr 24 | — | — | 730–1095 |
| Quince | — | — | Apr 24 | — | — | 1095–1825 |
| Raspberries | — | — | Apr 24 | — | — | 365–730 |
| Serviceberries | — | — | Apr 24 | — | — | 730–1095 |
| Strawberries | — | — | Apr 24 | — | Jul 24 – Dec 4 | 90–365 |
🌿 Herbs to Grow in Sarnia-Lambton
36 herbs that grow well in Zone 7b with planting dates for Sarnia-Lambton.
Show all 36 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Angelica | Feb 27 | Mar 20 | Mar 27 | Aug 18 | — | 365–730 |
| Anise | Feb 27 | Mar 20 | Mar 27 | Aug 18 | Jun 26 – Sep 11 | 90–120 |
| Basil | Feb 13 | Apr 10 | Apr 17 | — | Jun 12 – Aug 14 | 50–75 |
| Bee Balm | — | — | Apr 10 | — | Jul 10 – Sep 25 | 90–120 |
| Borage | Feb 27 | Mar 20 | Mar 27 | Aug 18 | May 22 – Jul 10 | 50–60 |
| Caraway | Feb 27 | Mar 20 | Mar 27 | Aug 18 | — | 365–450 |
| Catnip | — | — | Apr 10 | — | Jun 12 – Aug 14 | 60–80 |
| Chamomile | Feb 27 | Mar 20 | Mar 27 | Aug 18 | May 29 – Aug 7 | 60–90 |
| Chervil | Feb 27 | Mar 20 | Mar 27 | Aug 18 | May 8 – Jul 10 | 40–60 |
| Chives | — | — | Apr 10 | — | Jun 12 – Aug 21 | 60–90 |
| Cilantro | Feb 27 | Mar 20 | Mar 27 | Aug 18 | May 8 – Jul 10 | 40–60 |
| Comfrey | — | — | Apr 10 | — | Jun 12 – Aug 21 | 60–90 |
| Cumin | Feb 27 | Mar 20 | Mar 27 | Aug 18 | Jul 10 – Sep 11 | 100–120 |
| Dill | Feb 27 | Mar 20 | Mar 27 | Aug 18 | May 8 – Jul 10 | 40–60 |
| Epazote | Feb 13 | Apr 10 | Apr 17 | — | Jun 5 – Jul 31 | 45–60 |
| Fennel (herb) | Feb 27 | Mar 20 | Mar 27 | Aug 18 | May 29 – Aug 7 | 60–90 |
| Feverfew | — | — | Apr 10 | — | Jul 10 – Sep 25 | 90–120 |
| Garlic Chives | — | — | Apr 10 | — | Jun 12 – Aug 21 | 60–90 |
| Horehound | — | — | Apr 10 | — | Jun 26 – Aug 21 | 75–90 |
| Hyssop | — | — | Apr 10 | — | Jun 19 – Aug 21 | 70–90 |
| Lemon Balm | — | — | Apr 10 | — | Jun 12 – Jul 31 | 60–70 |
| Lemon Thyme | — | — | Apr 10 | — | Jun 19 – Aug 21 | 70–90 |
| Lovage | — | — | Apr 10 | — | Jun 19 – Aug 21 | 70–90 |
| Marjoram | — | — | Apr 10 | — | Jun 12 – Aug 21 | 60–90 |
| Mint | — | — | Apr 10 | — | Jun 12 – Aug 21 | 60–90 |
| Oregano | — | — | Apr 10 | — | Jun 12 – Aug 21 | 60–90 |
| Parsley | Feb 27 | Mar 20 | Mar 27 | Aug 18 | May 29 – Jul 31 | 60–80 |
| Rosemary | — | — | Apr 10 | — | Jul 3 – Nov 20 | 80–180 |
| Rue | — | — | Apr 10 | — | Jun 19 – Aug 21 | 70–90 |
| Sage | — | — | Apr 10 | — | Jun 26 – Aug 21 | 75–90 |
| Savory | — | — | Apr 10 | — | Jun 5 – Jul 31 | 50–70 |
| Sorrel | Feb 27 | Mar 20 | Mar 27 | Aug 18 | May 8 – Jul 10 | 40–60 |
| Tarragon | — | — | Apr 10 | — | Jun 12 – Aug 21 | 60–90 |
| Thai Basil | Feb 13 | Apr 10 | Apr 17 | — | Jun 12 – Aug 14 | 50–75 |
| Thyme | — | — | Apr 10 | — | Jun 19 – Aug 21 | 70–90 |
| Valerian | — | — | Apr 10 | — | Aug 14 – Nov 20 | 120–180 |
🌸 Flowers to Grow in Sarnia-Lambton
53 flowers that grow well in Zone 7b with planting dates for Sarnia-Lambton.
Show all 53 flowers with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Bloom | Days to Maturity |
|---|---|---|---|---|---|---|
| Ageratum | Feb 20 | Apr 3 | Apr 3 | — | May 29 – Oct 2 | 60–75 |
| Alliums | — | — | — | Sep 22 | Oct 20 – Nov 10 | 28–42 |
| Anemones | — | — | — | Sep 1 | Sep 15 – Oct 13 | 90–120 |
| Astilbe | Jan 30 | — | Apr 10 | — | Jun 19 – Aug 14 | 70–100 |
| Bachelor's Button | Feb 20 | Feb 27 | Apr 3 | Sep 1 | Jun 5 – Sep 11 | 60–90 |
| Begonias | Jan 23 | — | Apr 3 | — | Jun 12 – Oct 16 | 70–90 |
| Black-eyed Susan | Jan 30 | Mar 27 | Apr 10 | — | Jun 19 – Oct 30 | 60–80 |
| Bleeding Hearts | Jan 30 | — | Apr 10 | — | May 29 – Jul 3 | 60–90 |
| Calendula | Feb 20 | Feb 27 | Apr 3 | Sep 1 | May 22 – Sep 18 | 50–70 |
| California Poppy | — | Mar 6 | — | Sep 1 | May 15 – Aug 7 | 60–90 |
| Celosia | Mar 6 | Apr 3 | Apr 3 | — | Jun 5 – Oct 16 | 60–90 |
| Columbine | Feb 6 | Apr 10 | Apr 10 | — | May 29 – Jul 3 | 70–100 |
| Coreopsis | Jan 30 | Apr 3 | Apr 10 | — | Jun 12 – Oct 30 | 60–80 |
| Cosmos | Mar 6 | Mar 27 | Mar 27 | — | Jun 5 – Oct 9 | 60–90 |
| Crocus | — | — | — | Sep 22 | Aug 18 – Sep 8 | 10–20 |
| Daffodils | — | — | — | Sep 22 | Aug 25 – Sep 15 | 20–40 |
| Dahlias | Mar 13 | Apr 10 | Apr 10 | — | Jun 19 – Nov 6 | 70–120 |
| Daylily | Jan 30 | — | Apr 10 | — | Jun 19 – Oct 30 | 60–90 |
| Dianthus | Feb 6 | Feb 27 | Mar 6 | — | Apr 24 – Jul 17 | 60–80 |
| Echinacea (Purple Coneflower) | Jan 30 | Apr 10 | Apr 10 | — | Jun 26 – Oct 30 | 70–90 |
| Foxglove | Feb 6 | Apr 10 | Apr 10 | — | May 29 – Jul 3 | 80–120 |
| Gaillardia (Blanket Flower) | Feb 13 | Apr 3 | Apr 3 | — | Jun 12 – Nov 13 | 70–100 |
| Geraniums | Jan 23 | — | Apr 3 | — | Jun 12 – Oct 16 | 70–100 |
| Gladiolus | — | Apr 3 | Apr 3 | — | Jun 12 – Oct 30 | 70–100 |
| Hostas | Jan 23 | — | Apr 10 | — | Jun 19 – Oct 23 | 60–90 |
| Hyacinths | — | — | — | Sep 22 | Sep 15 – Oct 6 | 14–28 |
| Hydrangeas | Jan 23 | — | Apr 3 | — | Jun 12 – Oct 9 | 90–150 |
| Impatiens | Feb 6 | — | Apr 3 | — | Jun 12 – Oct 16 | 60–75 |
| Irises | — | Division | Apr 10 | — | May 29 – Jul 3 | 60–100 |
| Larkspur | — | Mar 6 | — | Aug 18 | May 15 – Aug 7 | 60–90 |
| Lavender | Jan 30 | — | Apr 10 | — | Jun 19 – Sep 11 | 90–120 |
| Lilies | — | Division | Apr 3 | — | Jun 12 – Oct 2 | 70–120 |
| Lobelia | Jan 30 | — | Mar 6 | — | May 1 – Jul 10 | 70–80 |
| Lupine | Feb 6 | Apr 10 | Apr 10 | — | May 29 – Jul 3 | 75–100 |
| Marigolds | Feb 20 | Apr 3 | Apr 3 | — | May 29 – Sep 18 | 50–70 |
| Nasturtium | Mar 6 | Apr 3 | Apr 3 | — | May 29 – Oct 16 | 55–65 |
| Pansy | Jan 23 | — | Mar 27 | Aug 18 | May 22 – Aug 14 | 70–90 |
| Peonies | — | Division | Apr 10 | — | Jun 5 – Jul 3 | 90–120 |
| Petunia | Feb 6 | — | Apr 3 | — | Jun 12 – Oct 9 | 70–90 |
| Phlox | Jan 30 | Apr 10 | Apr 10 | — | Jun 19 – Sep 11 | 80–110 |
| Portulaca | Mar 6 | Apr 3 | Apr 3 | — | May 22 – Oct 2 | 50–70 |
| Ranunculus | — | — | — | Sep 1 | Sep 22 – Oct 20 | 90–120 |
| Roses | Jan 23 | — | Apr 3 | — | Jun 12 – Oct 23 | 90–180 |
| Salvia | Feb 6 | — | Apr 3 | — | Jun 12 – Oct 16 | 70–90 |
| Sedum (Stonecrop) | Jan 30 | — | Apr 10 | — | Jul 31 – Oct 23 | 60–90 |
| Snapdragon | Jan 23 | Mar 6 | Mar 27 | Sep 1 | Jun 5 – Sep 11 | 70–100 |
| Sunflower | Mar 13 | Apr 3 | Apr 3 | — | Jun 26 – Oct 16 | 70–100 |
| Sweet Alyssum | Feb 20 | Mar 6 | Apr 3 | Sep 15 | May 15 – Aug 21 | 45–60 |
| Sweet Pea | — | — | — | Sep 1 | Nov 10 – Feb 2 | 65–85 |
| Tulips | — | — | — | Sep 22 | Sep 8 – Sep 29 | 15–30 |
| Vinca (Annual) | Jan 23 | — | Apr 3 | — | Jun 12 – Oct 16 | 70–90 |
| Yarrow | Jan 30 | Mar 27 | Apr 10 | — | Jun 12 – Oct 30 | 60–90 |
| Zinnia | Mar 6 | Apr 3 | Apr 3 | — | Jun 12 – Oct 16 | 60–70 |
Monthly Planting Guide for Sarnia-Lambton
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Sarnia-Lambton.
Frequently Asked Questions
What planting zone is Sarnia-Lambton, ON?
Sarnia-Lambton is in USDA Hardiness Zone 7b. 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 Sarnia-Lambton, ON?
Based on 30 years of NOAA weather station data, the median last spring frost in Sarnia-Lambton falls around April 3. Plan transplants and direct-sow dates relative to this date.
When is the first fall frost in Sarnia-Lambton, ON?
The median first fall frost in Sarnia-Lambton arrives around October 27. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
Is Sarnia-Lambton a good location for home gardening?
Sarnia-Lambton 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 Sarnia-Lambton Garden Planner — Free
A 22-page printable planner built for Sarnia-Lambton (Zone 7b). 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