Fredericton, NB — Planting Guide
Fredericton is in Zone 5b. The average last spring frost is April 24 and the first fall frost is October 8, giving you a growing season of approximately 167 days.
At an elevation of 21 m, Fredericton receives approximately 795 mm of rainfall annually. Summer highs average 26°C with winter lows around -12°C. The predominant soil type is Gray-Brown Podzol.
🌡️ Zone
5b (-15°F to -10°F min)
❄️ Last Frost
April 24
🍂 First Frost
October 8
📅 Growing Season
167 days
⛰️ Elevation
21 m
🌧️ Annual Rainfall
795 mm
Monthly Watering Calendar
When you'll need to water your garden — based on average monthly rainfall vs. the ~25 mm/week most gardens need.
View detailed monthly data
| Month | Avg Rainfall | Rainy Days | Extra Water Needed | Watering Effort |
|---|---|---|---|---|
| Jan | 36 mm | 8 days | — | None |
| Feb | 33 mm | 7 days | — | None |
| Mar | 51 mm | 9 days | — | None |
| Apr | 71 mm | 10 days | 38 mm | Moderate |
| May | 102 mm | 9 days | 8 mm | Low |
| Jun | 91 mm | 10 days | 18 mm | Moderate |
| Jul | 91 mm | 8 days | 18 mm | Moderate |
| Aug | 91 mm | 8 days | 18 mm | Moderate |
| Sep | 71 mm | 7 days | 38 mm | Moderate |
| Oct | 58 mm | 7 days | 51 mm | High |
| Nov | 53 mm | 8 days | — | None |
| Dec | 48 mm | 7 days | — | None |
Annual total: 798 mm. 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.
Fredericton Soil Profile
Soil Type
Gray-Brown Podzol
Soil pH
6.0-7.0
Drainage
Well Drained
Gardening Difficulty Score
Fredericton is a very forgiving place to garden. Most plants thrive here with minimal effort.
Local Gardening Help in Fredericton
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 Fredericton's climate and soil.
County Extension Office
Fredericton 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 Fredericton
Finding local nurseries & garden centers in Fredericton
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Fredericton'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 Fredericton NB" or "garden center Fredericton" 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 Fredericton NB" or check your extension office and local parks department. Facebook groups like "Fredericton Gardeners" or "New Brunswick 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
15.5 hours
Summer solstice daylight
Shortest Day
8.5 hours
Winter solstice daylight
Peak Sun Hours
9.7 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 | 8.8 hr | 3.7 hr | Short day |
| February | 10.1 hr | 4.6 hr | Short day |
| March | 11.6 hr | 5.4 hr | Short day |
| April | 13.3 hr | 6.9 hr | Neutral |
| May | 14.7 hr | 8.3 hr | Long day |
| June | 15.5 hr | 9.6 hr | Long day |
| July | 15.2 hr | 9.7 hr | Long day |
| August | 14 hr | 8.9 hr | Long day |
| September | 12.3 hr | 7.4 hr | Neutral |
| October | 10.7 hr | 5.4 hr | Short day |
| November | 9.2 hr | 3.6 hr | Short day |
| December | 8.5 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 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 16°C+
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 10cm Deep | Soil 20cm Deep | Compost Activity | Time to Finish |
|---|---|---|---|---|
| Jan | -4°C | 0°C | ❄️ Dormant | ~36 weeks |
| Feb | -6°C | -2°C | ❄️ Dormant | ~36 weeks |
| Mar | -1°C | 1°C | ❄️ Dormant | ~36 weeks |
| Apr | 7°C | 7°C | 🐢 Slow | ~24 weeks |
| May | 15°C | 12°C | ♻️ Active | ~14 weeks |
| Jun | 20°C | 18°C | 🔥 Peak | ~8 weeks |
| Jul | 25°C | 21°C | 🔥 Peak | ~8 weeks |
| Aug | 26°C | 22°C | 🔥 Peak | ~8 weeks |
| Sep | 22°C | 21°C | 🔥 Peak | ~8 weeks |
| Oct | 13°C | 15°C | ♻️ Active | ~14 weeks |
| Nov | 6°C | 9°C | 🐢 Slow | ~24 weeks |
| Dec | -1°C | 2°C | ❄️ Dormant | ~36 weeks |
Highlighted rows = soil 16°C+ (safe for warm-season transplants). Compost finishes fastest during peak activity months.
Pest & Disease Pressure in Fredericton
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 6 common pests in your area
| Pest | Risk Level | Peak Months |
|---|---|---|
| Aphids | Moderate | May, Jun, Jul, Aug |
| Japanese beetles | Moderate | Jun, Jul, Aug |
| Squash bugs | Low | Jun, Jul, Aug |
| Tomato hornworms | Moderate | Jul, Aug |
| Cabbage loopers | Low | May, Jun, Jul, Aug |
| Slugs | Low | Apr, May, Jun |
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
Cover Crops for Fredericton
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with county-specific planting dates.
Spring Cover Crops (3 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | Apr 30 | Aug 6 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Sorghum-sudan grass | May 2 | Aug 6 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Mar 28 | Jul 30 | ✓ 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 14 | Sep 17 | — | Deep roots break compaction, attract pollinators and beneficial insects |
Fall Cover Crops (6 options) — Plant after harvest to protect soil over winter
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Austrian winter peas | Jul 29 | Apr 10 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Daikon radish | Aug 29 | Apr 3 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Jul 14 | Apr 3 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Sep 1 | Apr 3 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jul 8 | Apr 3 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jun 30 | Apr 10 | — | 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: 22 km/h Summer: 16 km/h
Fall: 15 km/h Winter: 19 km/h
Prevailing wind: SW. Moderate wind — consider a temporary windbreak for young seedlings.
Windbreak Benefit
6.8/10
Moderately beneficial — a simple fence or trellis can protect delicate crops from wind stress.
Frost Pocket Risk
Low
Relatively flat terrain (58 m range). Frost pocket risk is minimal — garden placement is flexible.
Rainwater Harvesting Potential
How much water you can collect, when to collect it, and what size system you need for your garden.
Annual Collection
59,231 L
Per 93 m² of roof area (at 80% collection efficiency)
Recommended Setup
6 rain barrels (208 L each)
For a typical 46 m² garden. Serious collectors: consider a 6,624 L tank.
Legal Status
Unrestricted
Rainwater harvesting is fully legal in your state with no restrictions.
Best Collection Months
May, Jun, Jul, Aug
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 31.4 inches of rain per year
- A 1,000 sq ft roof can collect roughly 15,649 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 Fredericton
Soil Type
Gray-Brown Podzol
Amend with compost each season to maintain fertility and structure.
Watering Needs
Moderate rainfall (31.3 in.) — plan to water 1–2 times per week during the growing season.
Season Tips
167-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.
Monthly Planting Guide for Fredericton
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Fredericton.
Plan Your Garden with Confidence
Get our free Garden Planner — designed to help Fredericton gardeners in Zone 5b 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.
