Fairbanks North Star Borough, AK — Planting Guide
Fairbanks North Star Borough is in USDA Zone 2a. The average last spring frost is May 15 and the first fall frost is September 8, giving you a growing season of approximately 116 days.
At an elevation of 2,540 ft, Fairbanks North Star Borough receives approximately 29.3 in of rainfall annually. Summer highs average 69°F with winter lows around 9°F. The predominant soil type is Silt Loam.
Based on 31 years of NOAA climate station data, the last frost date here varies by 24 days year to year — ranging from May 5 in warm years to May 30 in cold years. The growing season is trending longer by about 3.63 days per decade. Fairbanks North Star Borough scores 55/100 (Moderate) on the Microclimate Index.
🌡️ Zone
2a (-50°F to -45°F min)
❄️ Last Frost
May 15
🍂 First Frost
September 8
📅 Growing Season
116 days
⛰️ Elevation
2,540 ft
🌧️ Annual Rainfall
29.3 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 | 1.6 in | 5 days | — | None |
| Feb | 1.4 in | 5 days | — | None |
| Mar | 1 in | 5 days | — | None |
| Apr | 1 in | 5 days | — | None |
| May | 1.2 in | 5 days | 3.1 in | Critical |
| Jun | 2.4 in | 7 days | 1.9 in | High |
| Jul | 3.3 in | 9 days | 1 in | Moderate |
| Aug | 4.1 in | 13 days | 0.2 in | Low |
| Sep | 5.3 in | 13 days | — | Low |
| Oct | 3.8 in | 11 days | — | None |
| Nov | 2.2 in | 7 days | — | None |
| Dec | 1.9 in | 6 days | — | None |
Annual total: 29.2 in. Gardens typically need ~1 inch of water per week during the growing season. Months marked "None" for extra water are outside the active growing season for your zone — most gardens are dormant and don't need irrigation during those months.
Fairbanks North Star Borough Soil Profile
Soil Type
Silt Loam
Soil pH
5.2-6.4
Drainage
Well Drained
Frost Risk Probability
Based on 31 years of NOAA weather station data from 3 stations
Beginners: Plant frost-sensitive crops (tomatoes, peppers, squash) after the "Safe" date on the left. Harvest or cover them before the "Protect by" date on the right. Hardy crops (lettuce, peas, kale) can go in the yellow transition zones.
How to read this table: "Conservative" means you're safe from frost 9 out of 10 years — best for beginners and frost-sensitive crops. "Average year" is the typical date. "Aggressive" means only 1 in 10 years is that warm — experienced gardeners with frost protection can try these dates.
| Planting Strategy | Last Spring Frost | First Fall Frost | Frost-Free Days |
|---|---|---|---|
| Conservative (safest) | May 30 | Sep 21 | 114 days |
| Cautious | May 20 | Sep 17 | 120 days |
| Average year | May 15 | Sep 8 | 116 days |
| Optimistic | May 11 | Sep 2 | 114 days |
| Aggressive (risky) | May 5 | Aug 22 | 109 days |
Not very — frost dates can vary by ±24 days year-to-year. Use the "Conservative" row in the table below, and keep row covers handy for surprise late frosts.
Yes — growing seasons are getting longer here (about 3.6 days per decade). Spring is arriving earlier than it used to. Good news for gardeners.
Gardening Difficulty Score
Fairbanks North Star Borough presents some gardening challenges. Choose adapted varieties and plan around frost dates.
Local Gardening Help in Fairbanks North Star Borough
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 Fairbanks North Star Borough's climate and soil.
County Extension Office
Fairbanks North Star Borough University of Alaska Fairbanks Cooperative Extension Extension Office
Phone: 907-474-5211
Visit Extension Office Website →
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 Fairbanks North Star Borough
Finding local nurseries & garden centers in Fairbanks North Star Borough
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Fairbanks North Star Borough'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 Fairbanks North Star Borough AK" or "garden center Fairbanks North Star Borough" 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 Fairbanks North Star Borough AK" or check your extension office and local parks department. Facebook groups like "Fairbanks North Star Borough Gardeners" or "Alaska 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.
Sunlight & Day Length
Monthly daylight hours and peak sun — critical for onion varieties, photoperiod-sensitive plants, and solar garden planning.
Longest Day
20.9 hours
Summer solstice daylight
Shortest Day
3.1 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 | 4.5 hr | 1.4 hr | Short day |
| February | 8 hr | 2.8 hr | Short day |
| March | 11.2 hr | 4.9 hr | Short day |
| April | 14.8 hr | 6.9 hr | Long day |
| May | 18.2 hr | 8 hr | Long day |
| June | 20.9 hr | 10.1 hr | Long day |
| July | 19.6 hr | 10.3 hr | Long day |
| August | 16.2 hr | 7.4 hr | Long day |
| September | 12.6 hr | 5 hr | Neutral |
| October | 9.2 hr | 3.1 hr | Short day |
| November | 5.6 hr | 1.6 hr | Short day |
| December | 3.1 hr | 0.8 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 Aug through Aug.
Best Month to Compost
Jun
Microbial activity peaks when soil is warm.
Active Composting
4 months
Short season — insulate pile or use indoor vermicomposting.
View detailed monthly data
| Month | Soil 4" Deep | Soil 8" Deep | Compost Activity | Time to Finish |
|---|---|---|---|---|
| Jan | 1°F | 9°F | ❄️ Dormant | ~36 weeks |
| Feb | 2°F | 9°F | ❄️ Dormant | ~36 weeks |
| Mar | 11°F | 14°F | ❄️ Dormant | ~36 weeks |
| Apr | 30°F | 26°F | ❄️ Dormant | ~36 weeks |
| May | 42°F | 36°F | 🐢 Slow | ~24 weeks |
| Jun | 55°F | 47°F | ♻️ Active | ~14 weeks |
| Jul | 60°F | 53°F | ♻️ Active | ~14 weeks |
| Aug | 60°F | 57°F | ♻️ Active | ~14 weeks |
| Sep | 54°F | 51°F | ♻️ Active | ~14 weeks |
| Oct | 40°F | 42°F | ❄️ Dormant | ~36 weeks |
| Nov | 24°F | 29°F | ❄️ Dormant | ~36 weeks |
| Dec | 9°F | 16°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 Fairbanks North Star Borough
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 3 common pests in your area
| Pest | Risk Level | Peak Months |
|---|---|---|
| Aphids | Moderate | Jun, Jul, Aug |
| Cabbage worms | Moderate | Jun, Jul, Aug |
| Slugs | Moderate | May, Jun, Jul, Aug |
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
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: 11 mph Winter: 13 mph
Prevailing wind: N. 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
Moderate
Some terrain variation (845 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
14,553 gal
Per 1,000 sq ft of roof area (at 80% collection efficiency)
Recommended Setup
7 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
Jul, Aug, Sep, Oct
Highest rainfall months — your barrels will fill up quickly during these months.
Months to Draw From Storage
Mar, Apr, May
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 29.2 inches of rain per year
- A 1,000 sq ft roof can collect roughly 14,553 gallons annually
- Rainwater harvesting is fully legal in your state
- Stock up on stored water before your dry season (Mar, Apr, May)
- Use a first-flush diverter to keep roof debris out of your collection
Soil & Growing Conditions in Fairbanks North Star Borough
Soil Type
Silt Loam
Soil pH 5.2–6.4 · Poorly Drained drainage
Raised beds strongly recommended here — native soil drainage or texture limits in-ground options.
Watering Needs
Drought stress: 1.5/10
Fairbanks North Star Borough has very low drought pressure. Natural rainfall usually meets garden needs — water only during extended dry spells.
Season Tips
116-day frost-free season
A short season means indoor starts are critical for warm-season crops. Prioritise cold-hardy, fast-maturing varieties and use row covers to extend autumn harvests.
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 Fairbanks North Star Borough
38 vegetables that grow well in Zone 2a with planting dates for Fairbanks North Star Borough.
Show all 38 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Amaranth | Mar 13 | May 29 | Jun 5 | Sep 4 – Oct 23 | 90–120 |
| Beets | — | May 8 | — | Jul 3 – Jul 31 | 50–70 |
| Bok Choy | Apr 3 | May 8 | May 15 | Jun 26 – Jul 31 | 40–60 |
| Broccoli | Apr 3 | May 8 | May 15 | Jul 17 – Aug 28 | 60–90 |
| Broccoli Rabe | Apr 3 | May 8 | May 15 | Jun 26 – Jul 31 | 40–60 |
| Brussels Sprouts | Apr 3 | May 8 | May 15 | Aug 14 – Oct 9 | 90–130 |
| Cabbage | Apr 3 | May 8 | May 15 | Jul 17 – Sep 11 | 60–100 |
| Cauliflower | Apr 3 | May 8 | May 15 | Jul 10 – Sep 11 | 55–100 |
| Celery | Apr 3 | May 8 | May 15 | Aug 7 – Oct 2 | 80–120 |
| Chard | Apr 3 | May 8 | May 15 | Jul 10 – Aug 28 | 50–60 |
| Chinese Cabbage | Apr 3 | May 8 | May 15 | Jul 10 – Aug 7 | 50–70 |
| Collard Greens | Apr 3 | May 8 | May 15 | Jul 10 – Sep 11 | 55–75 |
| Cress | Apr 3 | May 8 | May 15 | May 29 – Jun 19 | 14–21 |
| Daikon | — | May 8 | — | Jul 3 – Jul 31 | 50–70 |
| Fava Beans | Apr 3 | May 8 | May 15 | Jul 31 – Sep 11 | 75–100 |
| Kai Lan | Apr 3 | May 8 | May 15 | Jul 3 – Jul 31 | 45–60 |
| Kale | Apr 3 | May 8 | May 15 | Jul 10 – Sep 4 | 50–70 |
| Kohlrabi | Apr 3 | May 8 | May 15 | Jul 3 – Aug 7 | 45–65 |
| Komatsuna | Apr 3 | May 8 | May 15 | Jun 19 – Jul 24 | 35–50 |
| Lentils | Apr 3 | May 8 | May 15 | Aug 7 – Sep 18 | 80–110 |
| Lettuce | Apr 3 | May 8 | May 15 | Jun 19 – Aug 28 | 30–60 |
| Mache | Apr 3 | May 8 | May 15 | Jun 26 – Jul 31 | 40–60 |
| Microgreens | Apr 3 | May 8 | May 15 | May 22 – Jun 19 | 7–21 |
| Mustard Greens | Apr 3 | May 8 | May 15 | Jun 19 – Aug 21 | 30–50 |
| Napa Cabbage | Apr 3 | May 8 | May 15 | Jul 10 – Aug 14 | 55–75 |
| Pac Choi | Apr 3 | May 8 | May 15 | Jun 26 – Jul 24 | 40–55 |
| Parsnip | — | May 8 | — | Aug 21 – Oct 2 | 100–130 |
| Peas | Apr 3 | May 8 | May 15 | Jul 10 – Sep 4 | 55–70 |
| Purslane | Apr 3 | May 8 | May 15 | Jun 26 – Jul 31 | 40–60 |
| Radish | — | May 8 | — | Jun 5 – Jun 26 | 22–35 |
| Rutabaga | — | May 8 | — | Jul 31 – Sep 4 | 80–100 |
| Savoy Cabbage | Apr 3 | May 8 | May 15 | Jul 24 – Sep 18 | 70–110 |
| Snap Peas | Mar 13 | May 29 | Jun 5 | Jul 31 – Sep 25 | 55–70 |
| Snow Peas | Apr 3 | May 8 | May 15 | Jul 10 – Sep 4 | 50–65 |
| Spinach | Apr 3 | May 8 | May 15 | Jun 19 – Aug 21 | 35–50 |
| Sunflower | Mar 13 | May 29 | Jun 5 | Aug 14 – Oct 2 | 70–100 |
| Tatsoi | Apr 3 | May 8 | May 15 | Jun 19 – Jul 24 | 35–50 |
| Turnip | — | May 8 | — | Jun 19 – Jul 24 | 40–60 |
🍓 Fruits to Grow in Fairbanks North Star Borough
4 fruits that grow well in Zone 2a with planting dates for Fairbanks North Star Borough.
Show all 4 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Cranberries | — | — | Jun 12 | — | 730–1095 |
| Haskaps | — | — | Jun 12 | — | 730–1095 |
| Lingonberries | — | — | Jun 12 | — | 730–1095 |
| Serviceberries | — | — | Jun 12 | — | 730–1095 |
🌿 Herbs to Grow in Fairbanks North Star Borough
3 herbs that grow well in Zone 2a with planting dates for Fairbanks North Star Borough.
Monthly Planting Guide for Fairbanks North Star Borough
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Fairbanks North Star Borough.
Frequently Asked Questions
What planting zone is Fairbanks North Star Borough, AK?
Fairbanks North Star Borough is in USDA Hardiness Zone 2a. 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 Fairbanks North Star Borough, AK?
Based on 31 years of NOAA weather station data, the median last spring frost in Fairbanks North Star Borough falls around May 15. In 8 out of 10 years, last frost lands between May 5 and May 30 — a 24-day window of variability. Use May 30 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Fairbanks North Star Borough, AK?
The median first fall frost in Fairbanks North Star Borough arrives around September 8. In cold years it can arrive as early as August 22; in mild years as late as September 21. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Fairbanks North Star Borough?
Fairbanks North Star Borough has a frost-free growing season of approximately 116 days. Focus on short-season varieties and start warm-season crops indoors 6–8 weeks before last frost. Climate records show the growing season is trending longer by about 3.63 days per decade.
What is the soil like in Fairbanks North Star Borough for gardening?
Fairbanks North Star Borough has predominantly Silt Loam soil with a pH range of 5.2–6.4 and Poorly Drained drainage. The native soil conditions make raised beds a particularly good investment here — they let you control drainage and fertility independent of the ground soil.
What is grown commercially in Fairbanks North Star Borough?
Fairbanks North Star Borough has commercial agriculture that includes Hay, Cattle, Potatoes. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Fairbanks North Star Borough a good location for home gardening?
Fairbanks North Star Borough scores 55/100 (Moderate) on our Microclimate Index, which combines frost reliability, drought pressure, soil challenge, elevation risk, and long-term climate trend. Conditions here are moderate — most common crops grow well with standard timing and care.
Plan Your Garden with Confidence
Get our free Garden Planner — designed to help Fairbanks North Star Borough gardeners in Zone 2a organize planting dates, track what's growing, and never miss a planting window.
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