Sept-Iles, QC — Planting Guide
Sept-Iles is in USDA Zone 4a. The average last spring frost is May 16 and the first fall frost is October 3, giving you a growing season of approximately 140 days.
At an elevation of 173 ft, Sept-Iles receives approximately 19.5 in of rainfall annually. Summer highs average 70°F with winter lows around 2°F. The predominant soil type is Gray-Brown Podzol.
🌡️ Zone
4a (-30°F to -25°F min)
❄️ Last Frost
May 16
🍂 First Frost
October 3
📅 Growing Season
140 days
⛰️ Elevation
173 ft
🌧️ Annual Rainfall
19.5 in
Monthly Watering Calendar
When you'll need to water your garden — based on average monthly rainfall vs. the ~1 inch/week most gardens need.
View detailed monthly data
| Month | Avg Rainfall | Rainy Days | Extra Water Needed | Watering Effort |
|---|---|---|---|---|
| Jan | 0.8 in | 7 days | — | None |
| Feb | 0.8 in | 7 days | — | None |
| Mar | 1.3 in | 8 days | — | None |
| Apr | 1.9 in | 10 days | 2.4 in | High |
| May | 2.5 in | 9 days | 1.8 in | High |
| Jun | 2.7 in | 8 days | 1.6 in | High |
| Jul | 1.9 in | 8 days | 2.4 in | High |
| Aug | 1.9 in | 7 days | 2.4 in | High |
| Sep | 1.8 in | 9 days | 2.5 in | High |
| Oct | 1.5 in | 9 days | 2.8 in | High |
| Nov | 1.5 in | 8 days | — | None |
| Dec | 1 in | 8 days | — | None |
Annual total: 19.6 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.
Sept-Iles Soil Profile
Soil Type
Gray-Brown Podzol
Soil pH
6.0-7.0
Drainage
Well Drained
Gardening Difficulty Score
Sept-Iles is a very forgiving place to garden. Most plants thrive here with minimal effort.
Local Gardening Help in Sept-Iles
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 Sept-Iles's climate and soil.
County Extension Office
Sept-Iles 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 Sept-Iles
Finding local nurseries & garden centers in Sept-Iles
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Sept-Iles'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 Sept-Iles QC" or "garden center Sept-Iles" 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 Sept-Iles QC" or check your extension office and local parks department. Facebook groups like "Sept-Iles 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
Monthly daylight hours and peak sun — critical for onion varieties, photoperiod-sensitive plants, and solar garden planning.
Longest Day
16.2 hours
Summer solstice daylight
Shortest Day
7.8 hours
Winter solstice daylight
Peak Sun Hours
10.3 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 | 8.3 hr | 3.3 hr | Short day |
| February | 9.8 hr | 4.2 hr | Short day |
| March | 11.5 hr | 5.4 hr | Short day |
| April | 13.5 hr | 7 hr | Neutral |
| May | 15.2 hr | 8.8 hr | Long day |
| June | 16.2 hr | 10 hr | Long day |
| July | 15.8 hr | 10.3 hr | Long day |
| August | 14.3 hr | 8.9 hr | Long day |
| September | 12.4 hr | 7.5 hr | Neutral |
| October | 10.4 hr | 5.2 hr | Short day |
| November | 8.7 hr | 3.6 hr | Short day |
| December | 7.8 hr | 2.8 hr | Short day |
Peak sun hours factor in typical cloud cover — use these for solar panel and shade-planning calculations.
Soil Temperature & Composting Calendar
Monthly soil temps tell you when to plant warm-season crops, and when your compost pile is actively working.
Plant Warm Crops When
Soil reaches 60°F+
Soil warm enough from Jun through Sep.
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 | 14°F | 22°F | ❄️ Dormant | ~36 weeks |
| Feb | 15°F | 22°F | ❄️ Dormant | ~36 weeks |
| Mar | 25°F | 28°F | ❄️ Dormant | ~36 weeks |
| Apr | 40°F | 39°F | 🐢 Slow | ~24 weeks |
| May | 55°F | 48°F | ♻️ Active | ~14 weeks |
| Jun | 66°F | 57°F | 🔥 Peak | ~8 weeks |
| Jul | 70°F | 64°F | 🔥 Peak | ~8 weeks |
| Aug | 72°F | 67°F | 🔥 Peak | ~8 weeks |
| Sep | 65°F | 65°F | 🔥 Peak | ~8 weeks |
| Oct | 52°F | 56°F | ♻️ Active | ~14 weeks |
| Nov | 38°F | 43°F | ❄️ Dormant | ~36 weeks |
| Dec | 20°F | 31°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 Sept-Iles
Computed from local climate patterns — warmer, humid conditions increase pest generations and fungal disease risk.
Insect Pest Pressure
Moderate — common pests appear but manageable with monitoring.
Disease Risk
Low disease risk — dry conditions reduce fungal problems.
Seasonal Risk
View 5 common pests in your area
| Pest | Risk Level | Peak Months |
|---|---|---|
| Aphids | Moderate | May, Jun, Jul, Aug |
| Cabbage worms | Moderate | Jun, Jul, Aug |
| Colorado potato beetle | Low | Jun, Jul |
| Flea beetles | Low | May, Jun, Jul |
| Slugs | Moderate | May, 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 Sept-Iles
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with county-specific planting dates.
Spring Cover Crops (2 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | May 19 | Aug 8 | — | Rapid growth, attracts pollinators, suppresses weeds |
| White clover | Apr 17 | Jul 25 | ✓ 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 | Jun 7 | Sep 12 | — | Deep roots break compaction, attract pollinators and beneficial insects |
Fall Cover Crops (5 options) — Plant after harvest to protect soil over winter
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Daikon radish | Aug 19 | May 2 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Jul 10 | Apr 25 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Sep 8 | May 2 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jul 4 | May 2 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jul 6 | May 2 | — | Erosion control, weed suppression, good biomass |
Wind & Microclimate
Wind dries soil, stresses plants, and affects frost patterns. Understanding your exposure helps with garden placement.
Seasonal Wind Speed
Spring: 12 mph Summer: 8 mph
Fall: 9 mph Winter: 12 mph
Prevailing wind: SW. Moderate wind — consider a temporary windbreak for young seedlings.
Windbreak Benefit
5/10
Moderately beneficial — a simple fence or trellis can protect delicate crops from wind stress.
Frost Pocket Risk
Moderate
Some terrain variation (187 ft range). Garden on slopes or higher ground if possible to avoid late-season frost pockets.
Rainwater Harvesting Potential
How much water you can collect, when to collect it, and what size system you need for your garden.
Annual Collection
9,768 gal
Per 1,000 sq ft of roof area (at 80% collection efficiency)
Recommended Setup
8 rain barrels (55 gal each)
For a typical 500 sq ft garden. Serious collectors: consider a 2,000 gal tank.
Legal Status
Unrestricted
Rainwater harvesting is fully legal in your state with no restrictions.
Best Collection Months
Apr, May, Jun, Jul
Highest rainfall months — your barrels will fill up quickly during these months.
Months to Draw From Storage
Jan, Feb
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 19.6 inches of rain per year
- A 1,000 sq ft roof can collect roughly 9,768 gallons annually
- Rainwater harvesting is fully legal in your state
- In your dry climate, every drop counts — consider a larger cistern system
- Position collection tanks in shade to reduce evaporation and algae growth
Soil & Growing Conditions in Sept-Iles
Soil Type
Gray-Brown Podzol
Amend with compost each season to maintain fertility and structure.
Watering Needs
With 19.5 inches annually, regular irrigation is essential. Drip systems and heavy mulching conserve water.
Season Tips
140-day frost-free season
Start warm-season crops indoors and focus on short-season varieties. Cold frames extend your season by 3–4 weeks in fall.
Free Garden Planner
Plan your entire garden season — organize planting dates, track what you're growing, and know exactly when to start seeds, transplant, and harvest.
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.
🥬 Vegetables to Grow in Sept-Iles
96 vegetables that grow well in Zone 4a with planting dates for Sept-Iles.
Show all 96 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | Apr 4 | May 30 | Jun 6 | Aug 29 – Oct 3 | 80–100 |
| Amaranth | Mar 14 | May 30 | Jun 6 | Sep 5 – Oct 24 | 90–120 |
| Arugula | Apr 4 | May 9 | May 16 | Jun 20 – Aug 22 | 30–50 |
| Asparagus | — | — | May 30 | — | 730–1095 |
| Beets | — | May 9 | — | Jul 4 – Aug 1 | 50–70 |
| Belgian Endive | Apr 4 | May 9 | May 16 | Sep 5 – Oct 10 | 110–150 |
| Black Beans | — | May 30 | — | Aug 29 – Oct 17 | 90–120 |
| Bok Choy | Apr 4 | May 9 | May 16 | Jun 27 – Aug 1 | 40–60 |
| Broccoli | Apr 4 | May 9 | May 16 | Jul 18 – Aug 29 | 60–90 |
| Broccoli Rabe | Apr 4 | May 9 | May 16 | Jun 27 – Aug 1 | 40–60 |
| Brussels Sprouts | Apr 4 | May 9 | May 16 | Aug 15 – Oct 10 | 90–130 |
| Butternut Squash | Apr 4 | May 30 | Jun 6 | Sep 5 – Oct 10 | 85–110 |
| Cabbage | Apr 4 | May 9 | May 16 | Jul 18 – Sep 12 | 60–100 |
| Carrots | — | May 9 | — | Jul 11 – Aug 15 | 60–80 |
| Cauliflower | Apr 4 | May 9 | May 16 | Jul 11 – Sep 12 | 55–100 |
| Celeriac | Apr 4 | May 9 | May 16 | Aug 29 – Oct 3 | 100–120 |
| Celery | Apr 4 | May 9 | May 16 | Aug 8 – Oct 3 | 80–120 |
| Celtuce | Apr 4 | May 9 | May 16 | Jul 18 – Aug 29 | 60–90 |
| Chard | Apr 4 | May 9 | May 16 | Jul 11 – Aug 29 | 50–60 |
| Chickpeas | Apr 4 | May 9 | May 16 | Aug 8 – Sep 19 | 80–110 |
| Chicory | Apr 4 | May 9 | May 16 | Jul 18 – Aug 29 | 60–85 |
| Chinese Cabbage | Apr 4 | May 9 | May 16 | Jul 11 – Aug 8 | 50–70 |
| Christmas Lima Beans | Mar 14 | May 30 | Jun 6 | Aug 29 – Oct 3 | 80–100 |
| Collard Greens | Apr 4 | May 9 | May 16 | Jul 11 – Sep 12 | 55–75 |
| Corn | — | May 30 | — | Aug 1 – Sep 26 | 60–100 |
| Cress | Apr 4 | May 9 | May 16 | May 30 – Jun 20 | 14–21 |
| Crookneck Squash | Apr 4 | May 30 | Jun 6 | Jul 25 – Aug 22 | 45–60 |
| Crosne | — | May 9 | — | Oct 10 – Oct 3 | 150–200 |
| Cucumber | Apr 4 | May 30 | Jun 6 | Aug 1 – Sep 26 | 50–70 |
| Daikon | — | May 9 | — | Jul 4 – Aug 1 | 50–70 |
| Delicata Squash | Apr 4 | May 30 | Jun 6 | Aug 29 – Oct 3 | 80–100 |
| Edamame | — | May 30 | — | Aug 15 – Sep 26 | 75–100 |
| Endive | Apr 4 | May 9 | May 16 | Jul 4 – Aug 8 | 45–65 |
| Escarole | Apr 4 | May 9 | May 16 | Jul 11 – Aug 8 | 50–70 |
| Fava Beans | Apr 4 | May 9 | May 16 | Aug 1 – Sep 12 | 75–100 |
| Fennel | Mar 14 | May 30 | Jun 6 | Aug 8 – Sep 19 | 60–90 |
| Garlic | — | — | — | — | 90–240 |
| Green Beans | — | May 30 | — | Jul 25 – Sep 19 | 50–65 |
| Horseradish | — | — | May 30 | Oct 3 – Oct 24 | 120–180 |
| Hubbard Squash | Apr 4 | May 30 | Jun 6 | Sep 19 – Oct 24 | 100–120 |
| Kabocha | Apr 4 | May 30 | Jun 6 | Sep 5 – Oct 3 | 85–100 |
| Kai Lan | Apr 4 | May 9 | May 16 | Jul 4 – Aug 1 | 45–60 |
| Kale | Apr 4 | May 9 | May 16 | Jul 11 – Sep 5 | 50–70 |
| Kidney Beans | — | May 30 | — | Aug 29 – Oct 3 | 85–110 |
| Kohlrabi | Apr 4 | May 9 | May 16 | Jul 4 – Aug 8 | 45–65 |
| Komatsuna | Apr 4 | May 9 | May 16 | Jun 20 – Jul 25 | 35–50 |
| Leeks | Apr 4 | May 9 | May 16 | Aug 15 – Oct 10 | 90–150 |
| Lentils | Apr 4 | May 9 | May 16 | Aug 8 – Sep 19 | 80–110 |
| Lettuce | Apr 4 | May 9 | May 16 | Jun 20 – Aug 29 | 30–60 |
| Lima Beans | — | May 30 | — | Aug 1 – Sep 12 | 60–90 |
| Mache | Apr 4 | May 9 | May 16 | Jun 27 – Aug 1 | 40–60 |
| Melon | Apr 4 | May 30 | Jun 6 | Aug 15 – Oct 3 | 70–100 |
| Microgreens | Apr 4 | May 9 | May 16 | May 23 – Jun 20 | 7–21 |
| Mitsuba | Apr 4 | May 9 | May 9 | Jul 4 – Aug 29 | 50–70 |
| Mizuna | Apr 4 | May 9 | May 16 | Jun 20 – Jul 18 | 30–45 |
| Mustard Greens | Apr 4 | May 9 | May 16 | Jun 20 – Aug 22 | 30–50 |
| Napa Cabbage | Apr 4 | May 9 | May 16 | Jul 11 – Aug 15 | 55–75 |
| Onion | Apr 4 | May 9 | May 16 | Aug 15 – Oct 3 | 90–120 |
| Pac Choi | Apr 4 | May 9 | May 16 | Jun 27 – Jul 25 | 40–55 |
| Parsnip | — | May 9 | — | Aug 22 – Oct 3 | 100–130 |
| Patty Pan Squash | Apr 4 | May 30 | Jun 6 | Jul 25 – Aug 22 | 45–60 |
| Peas | Apr 4 | May 9 | May 16 | Jul 11 – Sep 5 | 55–70 |
| Peppers | Feb 28 | May 30 | Jun 6 | Aug 8 – Oct 17 | 60–90 |
| Pole Beans | Mar 14 | May 30 | Jun 6 | Aug 1 – Sep 26 | 55–70 |
| Potatoes | Mar 14 | May 30 | Jun 6 | Aug 15 – Oct 24 | 70–120 |
| Pumpkin | Apr 4 | May 30 | Jun 6 | Sep 5 – Oct 24 | 85–120 |
| Purslane | Apr 4 | May 9 | May 16 | Jun 27 – Aug 1 | 40–60 |
| Radicchio | Apr 4 | May 9 | May 16 | Jul 18 – Aug 22 | 60–80 |
| Radish | — | May 9 | — | Jun 6 – Jun 27 | 22–35 |
| Rhubarb | — | — | Jun 13 | — | 365–730 |
| Romanesco | Apr 4 | May 9 | May 16 | Aug 1 – Sep 12 | 75–100 |
| Rutabaga | — | May 9 | — | Aug 1 – Sep 5 | 80–100 |
| Salsify | — | May 9 | — | Aug 22 – Oct 3 | 100–130 |
| Savoy Cabbage | Apr 4 | May 9 | May 16 | Jul 25 – Sep 19 | 70–110 |
| Scallions | Apr 4 | May 9 | May 16 | Jul 11 – Aug 8 | 50–70 |
| Scarlet Runner Beans | Mar 14 | May 30 | Jun 6 | Aug 8 – Sep 12 | 60–80 |
| Shallot | Apr 4 | May 9 | May 16 | Aug 15 – Oct 3 | 90–120 |
| Shiso | Mar 21 | May 23 | Jun 6 | Aug 1 – Sep 26 | 50–70 |
| Snap Peas | Mar 14 | May 30 | Jun 6 | Aug 1 – Sep 26 | 55–70 |
| Snow Peas | Apr 4 | May 9 | May 16 | Jul 11 – Sep 5 | 50–65 |
| Soybeans | — | May 30 | — | Aug 22 – Oct 17 | 80–120 |
| Spaghetti Squash | Apr 4 | May 30 | Jun 6 | Sep 5 – Oct 3 | 85–100 |
| Spinach | Apr 4 | May 9 | May 16 | Jun 20 – Aug 22 | 35–50 |
| Squash (Summer) | Apr 4 | May 30 | Jun 6 | Jul 25 – Sep 26 | 45–65 |
| Squash (Winter) | Apr 4 | May 30 | Jun 6 | Aug 29 – Oct 24 | 80–120 |
| Sunchoke | — | — | May 30 | Sep 19 – Oct 24 | 110–150 |
| Sunflower | Mar 14 | May 30 | Jun 6 | Aug 15 – Oct 3 | 70–100 |
| Sweet Corn | — | May 30 | — | Aug 1 – Sep 12 | 60–90 |
| Tatsoi | Apr 4 | May 9 | May 16 | Jun 20 – Jul 25 | 35–50 |
| Tomatillo | Mar 14 | May 30 | Jun 6 | Aug 8 – Oct 17 | 60–85 |
| Tomatoes | Mar 14 | May 30 | Jun 6 | Aug 8 – Oct 17 | 60–85 |
| Turnip | — | May 9 | — | Jun 20 – Jul 25 | 40–60 |
| Watercress | Apr 4 | May 9 | May 16 | Jun 27 – Aug 1 | 40–60 |
| Watermelon | Apr 4 | May 30 | Jun 6 | Aug 15 – Oct 3 | 70–100 |
| Wax Beans | — | May 30 | — | Jul 25 – Sep 19 | 50–65 |
| Zucchini | Apr 4 | May 30 | Jun 6 | Jul 25 – Sep 19 | 45–60 |
🍓 Fruits to Grow in Sept-Iles
22 fruits that grow well in Zone 4a with planting dates for Sept-Iles.
Show all 22 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | Jun 13 | Sep 12 – Nov 7 | 90–180 |
| Aronia | — | — | Jun 13 | — | 730–1095 |
| Blueberries | — | — | Jun 13 | — | 730–1095 |
| Cantaloupe | — | — | Jun 13 | Aug 22 – Sep 26 | 70–90 |
| Cranberries | — | — | Jun 13 | — | 730–1095 |
| Currants | — | — | Jun 13 | — | 730–1095 |
| Elderberries | — | — | Jun 13 | — | 730–1095 |
| Goji Berries | — | — | Jun 13 | — | 730–1095 |
| Gooseberries | — | — | Jun 13 | — | 730–1095 |
| Grapes | — | — | Jun 13 | — | 730–1095 |
| Ground Cherry | — | — | Jun 13 | Aug 22 – Oct 17 | 65–80 |
| Hardy Kiwi | — | — | Jun 13 | — | 1095–1825 |
| Haskaps | — | — | Jun 13 | — | 730–1095 |
| Honeydew | — | — | Jun 13 | Sep 5 – Oct 17 | 80–110 |
| Jostaberry | — | — | Jun 13 | — | 730–1095 |
| Lingonberries | — | — | Jun 13 | — | 730–1095 |
| Medlar | — | — | Jun 13 | — | 1095–1825 |
| Mulberries | — | — | Jun 13 | — | 730–1825 |
| Persimmon | — | — | Jun 13 | — | 1095–2555 |
| Raspberries | — | — | Jun 13 | — | 365–730 |
| Serviceberries | — | — | Jun 13 | — | 730–1095 |
| Strawberries | — | — | Jun 13 | Sep 12 – Nov 7 | 90–365 |
🌿 Herbs to Grow in Sept-Iles
32 herbs that grow well in Zone 4a with planting dates for Sept-Iles.
Show all 32 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Angelica | Apr 4 | May 9 | May 9 | — | 365–730 |
| Anise | Apr 4 | May 9 | May 9 | Aug 8 – Oct 3 | 90–120 |
| Basil | Mar 21 | May 23 | Jun 6 | Aug 1 – Oct 3 | 50–75 |
| Bee Balm | — | — | May 23 | Aug 22 – Oct 17 | 90–120 |
| Borage | Apr 4 | May 9 | May 9 | Jul 4 – Aug 22 | 50–60 |
| Caraway | Apr 4 | May 9 | May 9 | — | 365–450 |
| Catnip | — | — | May 23 | Jul 25 – Sep 26 | 60–80 |
| Chamomile | Apr 4 | May 9 | May 9 | Jul 11 – Sep 19 | 60–90 |
| Chervil | Apr 4 | May 9 | May 9 | Jun 20 – Aug 22 | 40–60 |
| Chives | — | — | May 23 | Jul 25 – Oct 3 | 60–90 |
| Cilantro | Apr 4 | May 9 | May 9 | Jun 20 – Aug 22 | 40–60 |
| Comfrey | — | — | May 23 | Jul 25 – Oct 3 | 60–90 |
| Dill | Apr 4 | May 9 | May 9 | Jun 20 – Aug 22 | 40–60 |
| Echinacea | — | — | May 23 | Sep 26 – Oct 17 | 120–180 |
| Fennel (herb) | Apr 4 | May 9 | May 9 | Jul 11 – Sep 19 | 60–90 |
| Garlic Chives | — | — | May 23 | Jul 25 – Oct 3 | 60–90 |
| Horehound | — | — | May 23 | Aug 8 – Oct 3 | 75–90 |
| Hyssop | — | — | May 23 | Aug 1 – Oct 3 | 70–90 |
| Lemon Balm | — | — | May 23 | Jul 25 – Sep 12 | 60–70 |
| Lovage | — | — | May 23 | Aug 1 – Oct 3 | 70–90 |
| Mint | — | — | May 23 | Jul 25 – Oct 3 | 60–90 |
| Oregano | — | — | May 23 | Jul 25 – Oct 3 | 60–90 |
| Parsley | Apr 4 | May 9 | May 9 | Jul 11 – Sep 12 | 60–80 |
| Rue | — | — | May 23 | Aug 1 – Oct 3 | 70–90 |
| Sage | — | — | May 23 | Aug 8 – Oct 3 | 75–90 |
| Savory | — | — | May 23 | Jul 18 – Sep 12 | 50–70 |
| Sorrel | Apr 4 | May 9 | May 9 | Jun 20 – Aug 22 | 40–60 |
| Tarragon | — | — | May 23 | Jul 25 – Oct 3 | 60–90 |
| Thai Basil | Mar 21 | May 23 | Jun 6 | Aug 1 – Oct 3 | 50–75 |
| Thyme | — | — | May 23 | Aug 1 – Oct 3 | 70–90 |
| Valerian | — | — | May 23 | Sep 26 – Oct 17 | 120–180 |
| Yarrow | — | — | May 23 | Aug 22 – Oct 17 | 90–120 |
Monthly Planting Guide for Sept-Iles
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Sept-Iles.
Frequently Asked Questions
What planting zone is Sept-Iles, QC?
Sept-Iles is in USDA Hardiness Zone 4a. 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 Sept-Iles, QC?
Based on 30 years of NOAA weather station data, the median last spring frost in Sept-Iles falls around May 16. Plan transplants and direct-sow dates relative to this date.
When is the first fall frost in Sept-Iles, QC?
The median first fall frost in Sept-Iles arrives around October 3. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
Is Sept-Iles a good location for home gardening?
Sept-Iles scores 88/100 (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.
Plan Your Garden with Confidence
Get our free Garden Planner — designed to help Sept-Iles gardeners in Zone 4a organize planting dates, track what's growing, and never miss a planting window.
Get Your Free Garden Planner →Free download. Plan your entire garden season in minutes.
