North Slope Borough, AK — Planting Guide
May in North Slope Borough, Alaska — your action list
A quick May briefing for North Slope Borough, Alaska gardeners — what's urgent, what's next, and what can wait.
North Slope Borough is in USDA Zone 2b. The average last spring frost is May 27 and the first fall frost is July 31, giving you a growing season of approximately 65 days.
At an elevation of 2,600 ft, North Slope Borough receives approximately 16.6 in of rainfall annually. Summer highs average 69°F with winter lows around 3°F. The predominant soil type is Silt Loam.
🌡️ Zone
2b (°F to °F min)
❄️ Last Frost
May 27
🍂 First Frost
July 31
📅 Growing Season
65 days
⛰️ Elevation
2,600 ft
🌧️ Annual Rainfall
16.6 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 | 0.7 in | 6 days | — | None |
| Feb | 0.6 in | 4 days | — | None |
| Mar | 0.6 in | 4 days | — | None |
| Apr | 0.5 in | 5 days | — | None |
| May | 0.7 in | 5 days | 3.6 in | Critical |
| Jun | 1.2 in | 6 days | 3.1 in | Critical |
| Jul | 2.2 in | 12 days | 2.1 in | High |
| Aug | 2.4 in | 13 days | 1.9 in | High |
| Sep | 3.1 in | 13 days | 1.2 in | Moderate |
| Oct | 2.2 in | 11 days | — | None |
| Nov | 1.3 in | 7 days | — | None |
| Dec | 1 in | 7 days | — | None |
Annual total: 16.5 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.
North Slope Borough Soil Profile
Soil Type
Silt Loam
Soil pH
4.9-6.7
Drainage
Well Drained
Gardening Difficulty Score
North Slope Borough offers good growing conditions. A little planning around frost dates goes a long way.
Local Gardening Help in North Slope 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 North Slope Borough's climate and soil.
County Extension Office
North Slope 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 North Slope Borough
Finding local nurseries & garden centers in North Slope Borough
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to North Slope 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 North Slope Borough AK" or "garden center North Slope 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 North Slope Borough AK" or check your extension office and local parks department. Facebook groups like "North Slope 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.
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
24 hours
Summer solstice daylight
Shortest Day
0 hours
Winter solstice daylight
Peak Sun Hours
12.4 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 | 0 hr | 0 hr | Short day |
| February | 6.8 hr | 2.5 hr | Short day |
| March | 11 hr | 4.5 hr | Short day |
| April | 15.5 hr | 6.8 hr | Long day |
| May | 20.6 hr | 9.6 hr | Long day |
| June | 24 hr | 11.4 hr | Long day |
| July | 24 hr | 12.4 hr | Long day |
| August | 17.4 hr | 8.2 hr | Long day |
| September | 12.8 hr | 5.2 hr | Neutral |
| October | 8.4 hr | 2.9 hr | Short day |
| November | 3.1 hr | 0.9 hr | Short day |
| December | 0 hr | 0 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 Jul 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 | -2°F | 9°F | ❄️ Dormant | ~36 weeks |
| Feb | -1°F | 6°F | ❄️ Dormant | ~36 weeks |
| Mar | 12°F | 13°F | ❄️ Dormant | ~36 weeks |
| Apr | 28°F | 26°F | ❄️ Dormant | ~36 weeks |
| May | 42°F | 36°F | 🐢 Slow | ~24 weeks |
| Jun | 53°F | 45°F | ♻️ Active | ~14 weeks |
| Jul | 61°F | 54°F | ♻️ Active | ~14 weeks |
| Aug | 60°F | 55°F | ♻️ Active | ~14 weeks |
| Sep | 54°F | 50°F | ♻️ Active | ~14 weeks |
| Oct | 39°F | 41°F | ❄️ Dormant | ~36 weeks |
| Nov | 24°F | 28°F | ❄️ Dormant | ~36 weeks |
| Dec | 8°F | 18°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 North Slope Borough
Computed from local climate patterns — warmer, humid conditions increase pest generations and fungal disease risk.
Insect Pest Pressure
Low — basic prevention and occasional hand-picking.
Disease Risk
Low disease risk — dry conditions reduce fungal problems.
Seasonal Risk
View 4 common pests in your area
| Pest | Risk Level | Peak Months |
|---|---|---|
| Aphids | Low | Jun, Jul, Aug |
| Cabbage worms | Low | Jun, Jul, Aug |
| Flea beetles | Low | May, Jun, Jul |
| Slugs | Low | 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: 10 mph Summer: 9 mph
Fall: 9 mph Winter: 12 mph
Prevailing wind: N. Moderate wind — consider a temporary windbreak for young seedlings.
Windbreak Benefit
5.3/10
Moderately beneficial — a simple fence or trellis can protect delicate crops from wind stress.
Frost Pocket Risk
Moderate
Some terrain variation (649 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
8,223 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 2,250 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
Jan, Feb, 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 16.5 inches of rain per year
- A 1,000 sq ft roof can collect roughly 8,223 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 North Slope Borough
Soil Type
Silt Loam
Soil pH 4.9–6.7 · Somewhat Poorly Drained drainage
Raised beds strongly recommended here — native soil drainage or texture limits in-ground options.
Watering Needs
Drought stress: 1.5/10
North Slope Borough has very low drought pressure. Natural rainfall usually meets garden needs — water only during extended dry spells.
Season Tips
65-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.
Your Free Printable Garden Planner
Plan every bed, every planting, every harvest — in one place. This 24-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.
🥬 Vegetables to Grow in North Slope Borough
38 vegetables that grow well in Zone 2b with planting dates for North Slope Borough.
Show all 38 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Amaranth | Mar 25 | Jun 10 | Jun 17 | Sep 16 – Nov 4 | 90–120 |
| Beets | — | May 20 | — | Jul 15 – Aug 12 | 50–70 |
| Bok Choy | Apr 15 | May 20 | May 27 | Jul 8 – Aug 12 | 40–60 |
| Broccoli | Apr 15 | May 20 | May 27 | Jul 29 – Sep 9 | 60–90 |
| Broccoli Rabe | Apr 15 | May 20 | May 27 | Jul 8 – Aug 12 | 40–60 |
| Brussels Sprouts | Apr 15 | May 20 | May 27 | Aug 26 – Oct 21 | 90–130 |
| Cabbage | Apr 15 | May 20 | May 27 | Jul 29 – Sep 23 | 60–100 |
| Cauliflower | Apr 15 | May 20 | May 27 | Jul 22 – Sep 23 | 55–100 |
| Celery | Apr 15 | May 20 | May 27 | Aug 19 – Oct 14 | 80–120 |
| Chard | Apr 15 | May 20 | May 27 | Jul 22 – Sep 9 | 50–60 |
| Chinese Cabbage | Apr 15 | May 20 | May 27 | Jul 22 – Aug 19 | 50–70 |
| Collard Greens | Apr 15 | May 20 | May 27 | Jul 22 – Sep 23 | 55–75 |
| Cress | Apr 15 | May 20 | May 27 | Jun 10 – Jul 1 | 14–21 |
| Daikon | — | May 20 | — | Jul 15 – Aug 12 | 50–70 |
| Fava Beans | Apr 15 | May 20 | May 27 | Aug 12 – Sep 23 | 75–100 |
| Kai Lan | Apr 15 | May 20 | May 27 | Jul 15 – Aug 12 | 45–60 |
| Kale | Apr 15 | May 20 | May 27 | Jul 22 – Sep 16 | 50–70 |
| Kohlrabi | Apr 15 | May 20 | May 27 | Jul 15 – Aug 19 | 45–65 |
| Komatsuna | Apr 15 | May 20 | May 27 | Jul 1 – Aug 5 | 35–50 |
| Lentils | Apr 15 | May 20 | May 27 | Aug 19 – Sep 30 | 80–110 |
| Lettuce | Apr 15 | May 20 | May 27 | Jul 1 – Sep 9 | 30–60 |
| Mache | Apr 15 | May 20 | May 27 | Jul 8 – Aug 12 | 40–60 |
| Microgreens | Apr 15 | May 20 | May 27 | Jun 3 – Jul 1 | 7–21 |
| Mustard Greens | Apr 15 | May 20 | May 27 | Jul 1 – Sep 2 | 30–50 |
| Napa Cabbage | Apr 15 | May 20 | May 27 | Jul 22 – Aug 26 | 55–75 |
| Pac Choi | Apr 15 | May 20 | May 27 | Jul 8 – Aug 5 | 40–55 |
| Parsnip | — | May 20 | — | Sep 2 – Oct 14 | 100–130 |
| Peas | Apr 15 | May 20 | May 27 | Jul 22 – Sep 16 | 55–70 |
| Purslane | Apr 15 | May 20 | May 27 | Jul 8 – Aug 12 | 40–60 |
| Radish | — | May 20 | — | Jun 17 – Jul 8 | 22–35 |
| Rutabaga | — | May 20 | — | Aug 12 – Sep 16 | 80–100 |
| Savoy Cabbage | Apr 15 | May 20 | May 27 | Aug 5 – Sep 30 | 70–110 |
| Snap Peas | Mar 25 | Jun 10 | Jun 17 | Aug 12 – Oct 7 | 55–70 |
| Snow Peas | Apr 15 | May 20 | May 27 | Jul 22 – Sep 16 | 50–65 |
| Spinach | Apr 15 | May 20 | May 27 | Jul 1 – Sep 2 | 35–50 |
| Sunflower | Mar 25 | Jun 10 | Jun 17 | Aug 26 – Oct 14 | 70–100 |
| Tatsoi | Apr 15 | May 20 | May 27 | Jul 1 – Aug 5 | 35–50 |
| Turnip | — | May 20 | — | Jul 1 – Aug 5 | 40–60 |
🍓 Fruits to Grow in North Slope Borough
4 fruits that grow well in Zone 2b with planting dates for North Slope Borough.
Show all 4 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Cranberries | — | — | Jun 24 | — | 730–1095 |
| Haskaps | — | — | Jun 24 | — | 730–1095 |
| Lingonberries | — | — | Jun 24 | — | 730–1095 |
| Serviceberries | — | — | Jun 24 | — | 730–1095 |
🌿 Herbs to Grow in North Slope Borough
3 herbs that grow well in Zone 2b with planting dates for North Slope Borough.
Monthly Planting Guide for North Slope Borough
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in North Slope Borough.
Frequently Asked Questions
What planting zone is North Slope Borough, AK?
North Slope Borough is in USDA Hardiness Zone 2b. 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 North Slope Borough, AK?
Based on 30 years of NOAA weather station data, the median last spring frost in North Slope Borough falls around May 27. Plan transplants and direct-sow dates relative to this date.
When is the first fall frost in North Slope Borough, AK?
The median first fall frost in North Slope Borough arrives around July 31. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
What is the soil like in North Slope Borough for gardening?
North Slope Borough has predominantly Silt Loam soil with a pH range of 4.9–6.7 and Somewhat 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 North Slope Borough?
North Slope 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 North Slope Borough a good location for home gardening?
North Slope Borough scores 78/100 (Good) 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 North Slope Borough Garden Planner — Free
A 24-page printable planner built for North Slope Borough (Zone 2b). 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