Kenai Peninsula Borough, AK — Planting Guide
This month in Kenai Peninsula Borough, Alaska
Your Kenai Peninsula Borough, Alaska garden is entering a new phase. Here's what's on the schedule for May and why each task matters now.
-
Time to transplant basil, cucumber, and kale
Pinch off the lowest leaves on each seedling before you plant — it reduces water loss while the roots catch up.
-
Put basil, carrots, and cucumber seeds straight in the ground
Your soil is 52°F — warm enough for these to germinate without babying.
-
Collect radish, cress, and microgreens at their peak
This is the payoff month. Bring a basket, bring a friend, and get into the beds.
To set up a strong June, finish these tasks
- Transplants going out: alpine strawberries, aronia, and blackberries
- Starting indoors: cucumber, kale, and lettuce
- First harvests: lettuce, radish, and arugula
Kenai Peninsula Borough is in USDA Zone 5a. The average last spring frost is May 17 and the first fall frost is September 25, giving you a growing season of approximately 131 days.
At an elevation of 1,824 ft, Kenai Peninsula Borough receives approximately 55.7 in of rainfall annually. The predominant soil type is Silt Loam.
Based on 31 years of NOAA climate station data, the last frost date here varies by 30 days year to year — ranging from May 1 in warm years to June 1 in cold years. The growing season is trending longer by about 3.61 days per decade. Kenai Peninsula Borough scores 54/100 (Moderate) on the Microclimate Index.
🌡️ Zone
5a (°F to °F min)
❄️ Last Frost
May 17
🍂 First Frost
September 25
📅 Growing Season
131 days
⛰️ Elevation
1,824 ft
🌧️ Annual Rainfall
55.7 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 | 3.2 in | 6 days | — | None |
| Feb | 2.4 in | 5 days | — | None |
| Mar | 2 in | 5 days | — | None |
| Apr | 1.5 in | 4 days | 2.8 in | High |
| May | 2.3 in | 5 days | 2 in | High |
| Jun | 3.8 in | 8 days | 0.5 in | Low |
| Jul | 7.6 in | 11 days | — | Low |
| Aug | 8.3 in | 13 days | — | Low |
| Sep | 10.1 in | 15 days | — | Low |
| Oct | 7 in | 12 days | — | Low |
| Nov | 4.3 in | 9 days | — | None |
| Dec | 3.2 in | 6 days | — | None |
Annual total: 55.7 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.
Kenai Peninsula Borough Soil Profile
Soil Type
Silt Loam
Soil pH
5.2-6.8
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) | Jun 1 | Oct 10 | 131 days |
| Cautious | May 23 | Sep 29 | 129 days |
| Average year | May 17 | Sep 25 | 131 days |
| Optimistic | May 12 | Sep 18 | 129 days |
| Aggressive (risky) | May 1 | Sep 1 | 123 days |
Not very — frost dates can vary by ±30 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
Kenai Peninsula Borough presents some gardening challenges. Choose adapted varieties and plan around frost dates.
Local Gardening Help in Kenai Peninsula 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 Kenai Peninsula Borough's climate and soil.
County Extension Office
Kenai Peninsula 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 Kenai Peninsula Borough
Finding local nurseries & garden centers in Kenai Peninsula Borough
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Kenai Peninsula 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 Kenai Peninsula Borough AK" or "garden center Kenai Peninsula 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 Kenai Peninsula Borough AK" or check your extension office and local parks department. Facebook groups like "Kenai Peninsula 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
18.5 hours
Summer solstice daylight
Shortest Day
5.5 hours
Winter solstice daylight
Peak Sun Hours
8.9 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 | 6.3 hr | 2 hr | Short day |
| February | 8.8 hr | 3.2 hr | Short day |
| March | 11.3 hr | 4.7 hr | Short day |
| April | 14.2 hr | 6.6 hr | Long day |
| May | 16.8 hr | 7.4 hr | Long day |
| June | 18.5 hr | 8.9 hr | Long day |
| July | 17.8 hr | 8.5 hr | Long day |
| August | 15.4 hr | 6.8 hr | Long day |
| September | 12.5 hr | 4.9 hr | Neutral |
| October | 9.7 hr | 3.3 hr | Short day |
| November | 7.1 hr | 1.9 hr | Short day |
| December | 5.5 hr | 1.4 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
Jul
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 | 19°F | 27°F | ❄️ Dormant | ~36 weeks |
| Feb | 18°F | 25°F | ❄️ Dormant | ~36 weeks |
| Mar | 25°F | 29°F | ❄️ Dormant | ~36 weeks |
| Apr | 38°F | 38°F | ❄️ Dormant | ~36 weeks |
| May | 52°F | 48°F | ♻️ Active | ~14 weeks |
| Jun | 63°F | 59°F | ♻️ Active | ~14 weeks |
| Jul | 72°F | 66°F | 🔥 Peak | ~8 weeks |
| Aug | 72°F | 68°F | 🔥 Peak | ~8 weeks |
| Sep | 65°F | 65°F | 🔥 Peak | ~8 weeks |
| Oct | 52°F | 56°F | ♻️ Active | ~14 weeks |
| Nov | 37°F | 45°F | ❄️ Dormant | ~36 weeks |
| Dec | 23°F | 32°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 Kenai Peninsula 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
Moderate — watch for mildew and blight during wet periods.
Seasonal Risk
View 5 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 |
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 Kenai Peninsula Borough
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 | May 21 | Jul 17 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Sorghum-sudan grass | May 24 | Jul 17 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Apr 18 | Jul 24 | ✓ 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 2 | Sep 11 | — | 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 23 | May 3 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Daikon radish | Aug 12 | Apr 26 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Jul 2 | May 3 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Aug 15 | Apr 26 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jun 28 | May 3 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jun 28 | May 3 | — | 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: 9 mph
Fall: 10 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 (768 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
27,760 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
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 55.7 inches of rain per year
- A 1,000 sq ft roof can collect roughly 27,760 gallons annually
- Rainwater harvesting is fully legal in your state
- Your area gets ample rainfall — even small barrels make a big difference
- Consider a rain garden to handle overflow during heavy rainfall months
Soil & Growing Conditions in Kenai Peninsula Borough
Soil Type
Silt Loam
Soil pH 5.2–6.8 · Moderately Well Drained drainage
Raised beds strongly recommended here — native soil drainage or texture limits in-ground options.
Watering Needs
Drought stress: 1.5/10
Kenai Peninsula Borough has very low drought pressure. Natural rainfall usually meets garden needs — water only during extended dry spells.
Season Tips
131-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.
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 Kenai Peninsula Borough
106 vegetables that grow well in Zone 5a with planting dates for Kenai Peninsula Borough.
Show all 106 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | Apr 12 | May 24 | May 31 | Aug 23 – Sep 27 | 80–100 |
| Amaranth | Mar 22 | May 24 | May 31 | Aug 30 – Oct 18 | 90–120 |
| Arugula | Apr 12 | May 3 | May 17 | Jun 21 – Aug 23 | 30–50 |
| Asparagus | — | — | May 31 | — | 730–1095 |
| Beets | — | May 3 | — | Jun 28 – Jul 26 | 50–70 |
| Belgian Endive | Apr 12 | May 3 | May 17 | Sep 6 – Nov 1 | 110–150 |
| Bitter Melon | Mar 22 | May 24 | May 31 | Aug 2 – Sep 13 | 60–90 |
| Black Beans | — | May 24 | — | Aug 23 – Oct 11 | 90–120 |
| Bok Choy | Apr 12 | May 3 | May 17 | Jun 28 – Aug 2 | 40–60 |
| Broccoli | Apr 12 | May 3 | May 17 | Jul 19 – Aug 30 | 60–90 |
| Broccoli Rabe | Apr 12 | May 3 | May 17 | Jun 28 – Aug 2 | 40–60 |
| Brussels Sprouts | Apr 12 | May 3 | May 17 | Aug 16 – Oct 11 | 90–130 |
| Butternut Squash | Apr 12 | May 24 | May 31 | Aug 30 – Oct 4 | 85–110 |
| Cabbage | Apr 12 | May 3 | May 17 | Jul 19 – Sep 13 | 60–100 |
| Calabash | Mar 22 | May 24 | May 31 | Aug 23 – Oct 18 | 80–120 |
| Carrots | — | May 3 | — | Jul 5 – Aug 9 | 60–80 |
| Cauliflower | Apr 12 | May 3 | May 17 | Jul 12 – Sep 13 | 55–100 |
| Celeriac | Apr 12 | May 3 | May 17 | Aug 30 – Oct 4 | 100–120 |
| Celery | Apr 12 | May 3 | May 17 | Aug 9 – Oct 4 | 80–120 |
| Celtuce | Apr 12 | May 3 | May 17 | Jul 19 – Aug 30 | 60–90 |
| Chard | Apr 12 | May 3 | May 17 | Jul 12 – Aug 30 | 50–60 |
| Chickpeas | Apr 12 | May 3 | May 17 | Aug 9 – Sep 20 | 80–110 |
| Chicory | Apr 12 | May 3 | May 17 | Jul 19 – Aug 30 | 60–85 |
| Chinese Cabbage | Apr 12 | May 3 | May 17 | Jul 12 – Aug 9 | 50–70 |
| Christmas Lima Beans | Mar 22 | May 24 | May 31 | Aug 23 – Sep 27 | 80–100 |
| Collard Greens | Apr 12 | May 3 | May 17 | Jul 12 – Sep 13 | 55–75 |
| Corn | — | May 24 | — | Jul 26 – Sep 20 | 60–100 |
| Cowpeas | — | May 24 | — | Jul 26 – Sep 6 | 60–90 |
| Cress | Apr 12 | May 3 | May 17 | May 31 – Jun 21 | 14–21 |
| Crookneck Squash | Apr 12 | May 24 | May 31 | Jul 19 – Aug 16 | 45–60 |
| Crosne | — | May 3 | — | Oct 4 – Oct 18 | 150–200 |
| Cucumber | Apr 12 | May 24 | May 31 | Jul 26 – Sep 20 | 50–70 |
| Daikon | — | May 3 | — | Jun 28 – Jul 26 | 50–70 |
| Delicata Squash | Apr 12 | May 24 | May 31 | Aug 23 – Sep 27 | 80–100 |
| Edamame | — | May 24 | — | Aug 9 – Sep 20 | 75–100 |
| Eggplant | Mar 8 | May 24 | May 31 | Aug 9 – Oct 11 | 65–85 |
| Endive | Apr 12 | May 3 | May 17 | Jul 5 – Aug 9 | 45–65 |
| Escarole | Apr 12 | May 3 | May 17 | Jul 12 – Aug 9 | 50–70 |
| Fava Beans | Apr 12 | May 3 | May 17 | Aug 2 – Sep 13 | 75–100 |
| Fennel | Mar 22 | May 24 | May 31 | Aug 2 – Sep 13 | 60–90 |
| Garlic | — | — | — | — | 90–240 |
| Green Beans | — | May 24 | — | Jul 19 – Sep 13 | 50–65 |
| Horseradish | — | — | May 31 | Oct 4 – Nov 15 | 120–180 |
| Hot Peppers | Mar 8 | May 24 | May 31 | Aug 9 – Nov 15 | 70–120 |
| Hubbard Squash | Apr 12 | May 24 | May 31 | Sep 13 – Oct 18 | 100–120 |
| Kabocha | Apr 12 | May 24 | May 31 | Aug 30 – Sep 27 | 85–100 |
| Kai Lan | Apr 12 | May 3 | May 17 | Jul 5 – Aug 2 | 45–60 |
| Kale | Apr 12 | May 3 | May 17 | Jul 12 – Sep 6 | 50–70 |
| Kidney Beans | — | May 24 | — | Aug 23 – Sep 27 | 85–110 |
| Kohlrabi | Apr 12 | May 3 | May 17 | Jul 5 – Aug 9 | 45–65 |
| Komatsuna | Apr 12 | May 3 | May 17 | Jun 21 – Jul 26 | 35–50 |
| Leeks | Apr 12 | May 3 | May 17 | Aug 16 – Nov 1 | 90–150 |
| Lentils | Apr 12 | May 3 | May 17 | Aug 9 – Sep 20 | 80–110 |
| Lettuce | Apr 12 | May 3 | May 17 | Jun 21 – Aug 30 | 30–60 |
| Lima Beans | — | May 24 | — | Jul 26 – Sep 6 | 60–90 |
| Mache | Apr 12 | May 3 | May 17 | Jun 28 – Aug 2 | 40–60 |
| Melon | Apr 12 | May 24 | May 31 | Aug 9 – Sep 27 | 70–100 |
| Microgreens | Apr 12 | May 3 | May 17 | May 24 – Jun 21 | 7–21 |
| Mitsuba | Apr 12 | May 3 | May 10 | Jul 5 – Aug 30 | 50–70 |
| Mizuna | Apr 12 | May 3 | May 17 | Jun 21 – Jul 19 | 30–45 |
| Mustard Greens | Apr 12 | May 3 | May 17 | Jun 21 – Aug 23 | 30–50 |
| Napa Cabbage | Apr 12 | May 3 | May 17 | Jul 12 – Aug 16 | 55–75 |
| New Zealand Spinach | Mar 22 | May 24 | May 31 | Jul 26 – Aug 23 | 55–70 |
| Okra | Mar 22 | May 24 | May 31 | Jul 26 – Sep 20 | 50–65 |
| Onion | Apr 12 | May 3 | May 17 | Aug 16 – Oct 4 | 90–120 |
| Pac Choi | Apr 12 | May 3 | May 17 | Jun 28 – Jul 26 | 40–55 |
| Parsnip | — | May 3 | — | Aug 16 – Sep 27 | 100–130 |
| Patty Pan Squash | Apr 12 | May 24 | May 31 | Jul 19 – Aug 16 | 45–60 |
| Peas | Apr 12 | May 3 | May 17 | Jul 12 – Sep 6 | 55–70 |
| Peppers | Mar 8 | May 24 | May 31 | Aug 2 – Oct 11 | 60–90 |
| Pole Beans | Mar 22 | May 24 | May 31 | Jul 26 – Sep 20 | 55–70 |
| Potatoes | Mar 22 | May 24 | May 31 | Aug 9 – Oct 18 | 70–120 |
| Pumpkin | Apr 12 | May 24 | May 31 | Aug 30 – Oct 18 | 85–120 |
| Purslane | Apr 12 | May 3 | May 17 | Jun 28 – Aug 2 | 40–60 |
| Radicchio | Apr 12 | May 3 | May 17 | Jul 19 – Aug 23 | 60–80 |
| Radish | — | May 3 | — | May 31 – Jun 21 | 22–35 |
| Rhubarb | — | — | Jun 7 | — | 365–730 |
| Romanesco | Apr 12 | May 3 | May 17 | Aug 2 – Sep 13 | 75–100 |
| Rutabaga | — | May 3 | — | Jul 26 – Aug 30 | 80–100 |
| Salsify | — | May 3 | — | Aug 16 – Sep 27 | 100–130 |
| Savoy Cabbage | Apr 12 | May 3 | May 17 | Jul 26 – Sep 20 | 70–110 |
| Scallions | Apr 12 | May 3 | May 17 | Jul 12 – Aug 9 | 50–70 |
| Scarlet Runner Beans | Mar 22 | May 24 | May 31 | Aug 2 – Sep 6 | 60–80 |
| Shallot | Apr 12 | May 3 | May 17 | Aug 16 – Oct 4 | 90–120 |
| Shiso | Mar 29 | May 24 | May 31 | Jul 26 – Sep 20 | 50–70 |
| Snap Peas | Mar 22 | May 24 | May 31 | Jul 26 – Sep 20 | 55–70 |
| Snow Peas | Apr 12 | May 3 | May 17 | Jul 12 – Sep 6 | 50–65 |
| Soybeans | — | May 24 | — | Aug 16 – Oct 11 | 80–120 |
| Spaghetti Squash | Apr 12 | May 24 | May 31 | Aug 30 – Sep 27 | 85–100 |
| Spinach | Apr 12 | May 3 | May 17 | Jun 21 – Aug 23 | 35–50 |
| Squash (Summer) | Apr 12 | May 24 | May 31 | Jul 19 – Sep 20 | 45–65 |
| Squash (Winter) | Apr 12 | May 24 | May 31 | Aug 23 – Oct 18 | 80–120 |
| Sunchoke | — | — | May 31 | Sep 20 – Nov 15 | 110–150 |
| Sunflower | Mar 22 | May 24 | May 31 | Aug 9 – Sep 27 | 70–100 |
| Sweet Corn | — | May 24 | — | Jul 26 – Sep 6 | 60–90 |
| Sweet Potatoes | Mar 22 | May 24 | May 31 | Aug 30 – Oct 18 | 90–120 |
| Tatsoi | Apr 12 | May 3 | May 17 | Jun 21 – Jul 26 | 35–50 |
| Tomatillo | Mar 22 | May 24 | May 31 | Aug 2 – Oct 11 | 60–85 |
| Tomatoes | Mar 22 | May 24 | May 31 | Aug 2 – Oct 11 | 60–85 |
| Turnip | — | May 3 | — | Jun 14 – Jul 19 | 40–60 |
| Watercress | Apr 12 | May 3 | May 17 | Jun 28 – Aug 2 | 40–60 |
| Watermelon | Apr 12 | May 24 | May 31 | Aug 9 – Sep 27 | 70–100 |
| Wax Beans | — | May 24 | — | Jul 19 – Sep 13 | 50–65 |
| Winter Melon | Mar 22 | May 24 | May 31 | Aug 30 – Oct 18 | 90–120 |
| Yard Long Beans | Mar 22 | May 24 | May 31 | Jul 26 – Sep 6 | 55–80 |
| Zucchini | Apr 12 | May 24 | May 31 | Jul 19 – Sep 13 | 45–60 |
🍓 Fruits to Grow in Kenai Peninsula Borough
27 fruits that grow well in Zone 5a with planting dates for Kenai Peninsula Borough.
Show all 27 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | Jun 7 | Sep 6 – Nov 22 | 90–180 |
| Aronia | — | — | Jun 7 | — | 730–1095 |
| Blackberries | — | — | Jun 7 | — | 365–730 |
| Blueberries | — | — | Jun 7 | — | 730–1095 |
| Boysenberries | — | — | Jun 7 | — | 365–730 |
| Cantaloupe | — | — | Jun 7 | Aug 16 – Sep 20 | 70–90 |
| Che Fruit | — | — | Jun 7 | — | 1095–1825 |
| Cranberries | — | — | Jun 7 | — | 730–1095 |
| Currants | — | — | Jun 7 | — | 730–1095 |
| Elderberries | — | — | Jun 7 | — | 730–1095 |
| Goji Berries | — | — | Jun 7 | — | 730–1095 |
| Gooseberries | — | — | Jun 7 | — | 730–1095 |
| Grapes | — | — | Jun 7 | — | 730–1095 |
| Ground Cherry | — | — | Jun 7 | Aug 16 – Oct 11 | 65–80 |
| Hardy Kiwi | — | — | Jun 7 | — | 1095–1825 |
| Haskaps | — | — | Jun 7 | — | 730–1095 |
| Honeydew | — | — | Jun 7 | Aug 30 – Oct 11 | 80–110 |
| Jostaberry | — | — | Jun 7 | — | 730–1095 |
| Lingonberries | — | — | Jun 7 | — | 730–1095 |
| Medlar | — | — | Jun 7 | — | 1095–1825 |
| Mulberries | — | — | Jun 7 | — | 730–1825 |
| Pawpaw | — | — | Jun 7 | — | 1095–2555 |
| Persimmon | — | — | Jun 7 | — | 1095–2555 |
| Quince | — | — | Jun 7 | — | 1095–1825 |
| Raspberries | — | — | Jun 7 | — | 365–730 |
| Serviceberries | — | — | Jun 7 | — | 730–1095 |
| Strawberries | — | — | Jun 7 | Sep 6 – Nov 22 | 90–365 |
🌿 Herbs to Grow in Kenai Peninsula Borough
37 herbs that grow well in Zone 5a with planting dates for Kenai Peninsula Borough.
Show all 37 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Angelica | Apr 12 | May 3 | May 10 | — | 365–730 |
| Anise | Apr 12 | May 3 | May 10 | Aug 9 – Oct 25 | 90–120 |
| Basil | Mar 29 | May 24 | May 31 | Jul 26 – Sep 27 | 50–75 |
| Bee Balm | — | — | May 24 | Aug 23 – Nov 8 | 90–120 |
| Borage | Apr 12 | May 3 | May 10 | Jul 5 – Aug 23 | 50–60 |
| Caraway | Apr 12 | May 3 | May 10 | — | 365–450 |
| Catnip | — | — | May 24 | Jul 26 – Sep 27 | 60–80 |
| Chamomile | Apr 12 | May 3 | May 10 | Jul 12 – Sep 20 | 60–90 |
| Chervil | Apr 12 | May 3 | May 10 | Jun 21 – Aug 23 | 40–60 |
| Chives | — | — | May 24 | Jul 26 – Oct 4 | 60–90 |
| Cilantro | Apr 12 | May 3 | May 10 | Jun 21 – Aug 23 | 40–60 |
| Comfrey | — | — | May 24 | Jul 26 – Oct 4 | 60–90 |
| Cumin | Apr 12 | May 3 | May 10 | Aug 23 – Oct 25 | 100–120 |
| Dill | Apr 12 | May 3 | May 10 | Jun 21 – Aug 23 | 40–60 |
| Echinacea | — | — | May 24 | Sep 27 – Nov 8 | 120–180 |
| Epazote | Mar 29 | May 24 | May 31 | Jul 19 – Sep 13 | 45–60 |
| Fennel (herb) | Apr 12 | May 3 | May 10 | Jul 12 – Sep 20 | 60–90 |
| Feverfew | — | — | May 24 | Aug 23 – Nov 8 | 90–120 |
| Garlic Chives | — | — | May 24 | Jul 26 – Oct 4 | 60–90 |
| Horehound | — | — | May 24 | Aug 9 – Oct 4 | 75–90 |
| Hyssop | — | — | May 24 | Aug 2 – Oct 4 | 70–90 |
| Lavender | — | — | May 24 | Aug 23 – Nov 8 | 90–200 |
| Lemon Balm | — | — | May 24 | Jul 26 – Sep 13 | 60–70 |
| Lemon Thyme | — | — | May 24 | Aug 2 – Oct 4 | 70–90 |
| Lovage | — | — | May 24 | Aug 2 – Oct 4 | 70–90 |
| Mint | — | — | May 24 | Jul 26 – Oct 4 | 60–90 |
| Oregano | — | — | May 24 | Jul 26 – Oct 4 | 60–90 |
| Parsley | Apr 12 | May 3 | May 10 | Jul 12 – Sep 13 | 60–80 |
| Rue | — | — | May 24 | Aug 2 – Oct 4 | 70–90 |
| Sage | — | — | May 24 | Aug 9 – Oct 4 | 75–90 |
| Savory | — | — | May 24 | Jul 19 – Sep 13 | 50–70 |
| Sorrel | Apr 12 | May 3 | May 10 | Jun 21 – Aug 23 | 40–60 |
| Tarragon | — | — | May 24 | Jul 26 – Oct 4 | 60–90 |
| Thai Basil | Mar 29 | May 24 | May 31 | Jul 26 – Sep 27 | 50–75 |
| Thyme | — | — | May 24 | Aug 2 – Oct 4 | 70–90 |
| Valerian | — | — | May 24 | Sep 27 – Nov 8 | 120–180 |
| Yarrow | — | — | May 24 | Aug 23 – Nov 8 | 90–120 |
Monthly Planting Guide for Kenai Peninsula Borough
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Kenai Peninsula Borough.
Frequently Asked Questions
What planting zone is Kenai Peninsula Borough, AK?
Kenai Peninsula Borough is in USDA Hardiness Zone 5a. 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 Kenai Peninsula Borough, AK?
Based on 31 years of NOAA weather station data, the median last spring frost in Kenai Peninsula Borough falls around May 17. In 8 out of 10 years, last frost lands between May 1 and June 1 — a 30-day window of variability. Use June 1 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Kenai Peninsula Borough, AK?
The median first fall frost in Kenai Peninsula Borough arrives around September 25. In cold years it can arrive as early as September 1; in mild years as late as October 10. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Kenai Peninsula Borough?
Kenai Peninsula Borough has a frost-free growing season of approximately 131 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 3.61 days per decade.
What is the soil like in Kenai Peninsula Borough for gardening?
Kenai Peninsula Borough has predominantly Silt Loam soil with a pH range of 5.2–6.8 and Moderately Well 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 Kenai Peninsula Borough?
Kenai Peninsula 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 Kenai Peninsula Borough a good location for home gardening?
Kenai Peninsula Borough scores 54/100 (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.
Your Kenai Peninsula Borough Garden Planner — Free
A 24-page printable planner built for Kenai Peninsula Borough (Zone 5a). 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