Petersburg Borough, AK — Planting Guide
Petersburg Borough is in USDA Zone 7a. The average last spring frost is April 23 and the first fall frost is October 20, giving you a growing season of approximately 180 days.
At an elevation of 974 ft, Petersburg Borough receives approximately 17.4 in of rainfall annually. Summer highs average 57°F with winter lows around -1°F. The predominant soil type is Silt Loam.
Based on 26 years of NOAA climate station data, the last frost date here varies by 36 days year to year — ranging from April 6 in warm years to May 12 in cold years. The growing season is trending shorter by about 2.88 days per decade. Petersburg Borough scores 51/100 (Moderate) on the Microclimate Index.
🌡️ Zone
7a (0°F to 5°F min)
❄️ Last Frost
April 23
🍂 First Frost
October 20
📅 Growing Season
180 days
⛰️ Elevation
974 ft
🌧️ Annual Rainfall
17.4 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 | 0.9 in | 5 days | — | None |
| Feb | 0.9 in | 5 days | — | None |
| Mar | 0.7 in | 4 days | 3.6 in | Critical |
| Apr | 0.5 in | 4 days | 3.8 in | Critical |
| May | 0.7 in | 5 days | 3.6 in | Critical |
| Jun | 1.2 in | 7 days | 3.1 in | Critical |
| Jul | 2 in | 11 days | 2.3 in | High |
| Aug | 2.5 in | 13 days | 1.8 in | High |
| Sep | 2.9 in | 13 days | 1.4 in | Moderate |
| Oct | 2.6 in | 10 days | 1.7 in | High |
| Nov | 1.4 in | 6 days | — | None |
| Dec | 1.2 in | 7 days | — | None |
Annual total: 17.5 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.
Petersburg Borough Soil Profile
Soil Type
Silt Loam
Soil pH
4.9-6.3
Drainage
Well Drained
Frost Risk Probability
Based on 26 years of NOAA weather station data from 2 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 12 | Nov 9 | 181 days |
| Cautious | May 1 | Oct 29 | 181 days |
| Average year | Apr 23 | Oct 20 | 180 days |
| Optimistic | Apr 16 | Oct 9 | 176 days |
| Aggressive (risky) | Apr 6 | Oct 1 | 178 days |
Not very — frost dates can vary by ±36 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 shorter here (about 2.9 days per decade). Use the "Conservative" dates and choose fast-maturing varieties.
Gardening Difficulty Score
Petersburg Borough presents some gardening challenges. Choose adapted varieties and plan around frost dates.
Local Gardening Help in Petersburg 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 Petersburg Borough's climate and soil.
County Extension Office
Petersburg 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 Petersburg Borough
Finding local nurseries & garden centers in Petersburg Borough
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Petersburg 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 Petersburg Borough AK" or "garden center Petersburg 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 Petersburg Borough AK" or check your extension office and local parks department. Facebook groups like "Petersburg 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
17.5 hours
Summer solstice daylight
Shortest Day
6.5 hours
Winter solstice daylight
Peak Sun Hours
8.3 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 | 7.1 hr | 2.1 hr | Short day |
| February | 9.2 hr | 3.1 hr | Short day |
| March | 11.4 hr | 5 hr | Short day |
| April | 14 hr | 6.6 hr | Long day |
| May | 16.2 hr | 7.4 hr | Long day |
| June | 17.5 hr | 8.3 hr | Long day |
| July | 16.9 hr | 8.3 hr | Long day |
| August | 14.9 hr | 6.5 hr | Long day |
| September | 12.5 hr | 4.8 hr | Neutral |
| October | 10 hr | 3.4 hr | Short day |
| November | 7.7 hr | 2.1 hr | Short day |
| December | 6.5 hr | 1.6 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 May through Oct.
Best Month to Compost
Jun
Microbial activity peaks when soil is warm.
Active Composting
8 months
Nearly year-round composting.
View detailed monthly data
| Month | Soil 4" Deep | Soil 8" Deep | Compost Activity | Time to Finish |
|---|---|---|---|---|
| Jan | 35°F | 42°F | ❄️ Dormant | ~36 weeks |
| Feb | 37°F | 43°F | ❄️ Dormant | ~36 weeks |
| Mar | 44°F | 45°F | 🐢 Slow | ~24 weeks |
| Apr | 53°F | 53°F | ♻️ Active | ~14 weeks |
| May | 63°F | 62°F | ♻️ Active | ~14 weeks |
| Jun | 74°F | 70°F | 🔥 Peak | ~8 weeks |
| Jul | 81°F | 77°F | 🔥 Peak | ~8 weeks |
| Aug | 82°F | 80°F | 🔥 Peak | ~8 weeks |
| Sep | 77°F | 76°F | 🔥 Peak | ~8 weeks |
| Oct | 68°F | 68°F | 🔥 Peak | ~8 weeks |
| Nov | 53°F | 57°F | ♻️ Active | ~14 weeks |
| Dec | 42°F | 49°F | 🐢 Slow | ~24 weeks |
Highlighted rows = soil 60°F+ (safe for warm-season transplants). Compost finishes fastest during peak activity months.
Pest & Disease Pressure in Petersburg 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 6 common pests in your area
| Pest | Risk Level | Peak Months |
|---|---|---|
| Aphids | High | Mar, Apr, May, Jun, Jul, Aug, Sep, Oct |
| Japanese beetles | Moderate | Jun, Jul, Aug |
| Squash vine borers | High | May, Jun, Jul |
| Stink bugs | Moderate | May, Jun, Jul, Aug, Sep |
| Whiteflies | Low | Jun, Jul, Aug, Sep |
| Spider mites | Moderate | 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 Petersburg Borough
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with county-specific planting dates.
Fall Cover Crops (7 options) — Plant after harvest to protect soil over winter
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Austrian winter peas | Aug 23 | Apr 9 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Crimson clover | Aug 24 | Apr 9 | ✓ Yes | Fixes nitrogen, attracts pollinators in spring |
| Daikon radish | Aug 23 | Apr 9 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Aug 6 | Apr 2 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Sep 14 | Apr 9 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jul 23 | Apr 2 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jul 22 | Apr 9 | — | Erosion control, weed suppression, good biomass |
Spring Cover Crops (4 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | Apr 25 | Aug 25 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Cowpeas (southern peas) | May 1 | Aug 18 | ✓ Yes | Excellent nitrogen fixer for warm climates, edible |
| Sorghum-sudan grass | May 3 | Aug 18 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Mar 28 | Aug 18 | ✓ 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 15 | Oct 6 | — | Deep roots break compaction, attract pollinators and beneficial insects |
Wind & Microclimate
Wind dries soil, stresses plants, and affects frost patterns. Understanding your exposure helps with garden placement.
Seasonal Wind Speed
Spring: 11 mph Summer: 7 mph
Fall: 11 mph Winter: 13 mph
Prevailing wind: N. Moderate wind — consider a temporary windbreak for young seedlings.
Windbreak Benefit
5.1/10
Moderately beneficial — a simple fence or trellis can protect delicate crops from wind stress.
Frost Pocket Risk
Moderate
Some terrain variation (620 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
8,722 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
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 17.5 inches of rain per year
- A 1,000 sq ft roof can collect roughly 8,722 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 Petersburg Borough
Soil Type
Silt Loam
Soil pH 4.9–6.3 · 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
Petersburg Borough has very low drought pressure. Natural rainfall usually meets garden needs — water only during extended dry spells.
Season Tips
180-day frost-free season
Plenty of time for warm-season crops. Start heat-lovers indoors 6–8 weeks before last frost to maximise your harvest window.
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 Petersburg Borough
113 vegetables that grow well in Zone 7a with planting dates for Petersburg Borough.
Show all 113 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | Mar 26 | Apr 30 | May 7 | Jul 30 – Sep 3 | 80–100 |
| Amaranth | Mar 5 | Apr 30 | May 7 | Aug 6 – Sep 24 | 90–120 |
| Artichoke | — | — | May 7 | Sep 10 – Nov 19 | 120–180 |
| Arugula | Mar 19 | Apr 9 | Apr 23 | May 28 – Jul 30 | 30–50 |
| Asparagus | — | — | May 7 | — | 730–1095 |
| Beets | — | Apr 9 | — | Jun 4 – Jul 2 | 50–70 |
| Belgian Endive | Mar 19 | Apr 9 | Apr 23 | Aug 13 – Oct 8 | 110–150 |
| Bitter Melon | Mar 5 | Apr 30 | May 7 | Jul 9 – Aug 20 | 60–90 |
| Black Beans | — | Apr 30 | — | Jul 30 – Sep 17 | 90–120 |
| Bok Choy | Mar 19 | Apr 9 | Apr 23 | Jun 4 – Jul 9 | 40–60 |
| Broccoli | Mar 19 | Apr 9 | Apr 23 | Jun 25 – Aug 6 | 60–90 |
| Broccoli Rabe | Mar 19 | Apr 9 | Apr 23 | Jun 4 – Jul 9 | 40–60 |
| Brussels Sprouts | Mar 19 | Apr 9 | Apr 23 | Jul 23 – Sep 17 | 90–130 |
| Butternut Squash | Mar 26 | Apr 30 | May 7 | Aug 6 – Sep 10 | 85–110 |
| Cabbage | Mar 19 | Apr 9 | Apr 23 | Jun 25 – Aug 20 | 60–100 |
| Calabash | Mar 5 | Apr 30 | May 7 | Jul 30 – Sep 24 | 80–120 |
| Cardoon | — | — | May 7 | Sep 10 – Oct 22 | 120–150 |
| Carrots | — | Apr 9 | — | Jun 11 – Jul 16 | 60–80 |
| Cauliflower | Mar 19 | Apr 9 | Apr 23 | Jun 18 – Aug 20 | 55–100 |
| Celeriac | Mar 19 | Apr 9 | Apr 23 | Aug 6 – Sep 10 | 100–120 |
| Celery | Mar 19 | Apr 9 | Apr 23 | Jul 16 – Sep 10 | 80–120 |
| Celtuce | Mar 19 | Apr 9 | Apr 23 | Jun 25 – Aug 6 | 60–90 |
| Chard | Mar 19 | Apr 9 | Apr 23 | Jun 18 – Aug 6 | 50–60 |
| Chayote | Mar 5 | Apr 30 | May 7 | Sep 10 – Nov 19 | 120–180 |
| Chickpeas | Mar 19 | Apr 9 | Apr 23 | Jul 16 – Aug 27 | 80–110 |
| Chicory | Mar 19 | Apr 9 | Apr 23 | Jun 25 – Aug 6 | 60–85 |
| Chinese Cabbage | Mar 19 | Apr 9 | Apr 23 | Jun 18 – Jul 16 | 50–70 |
| Christmas Lima Beans | Mar 5 | Apr 30 | May 7 | Jul 30 – Sep 3 | 80–100 |
| Collard Greens | Mar 19 | Apr 9 | Apr 23 | Jun 18 – Aug 20 | 55–75 |
| Corn | — | Apr 30 | — | Jul 2 – Aug 27 | 60–100 |
| Cowpeas | — | Apr 30 | — | Jul 2 – Aug 13 | 60–90 |
| Cress | Mar 19 | Apr 9 | Apr 23 | May 7 – May 28 | 14–21 |
| Crookneck Squash | Mar 26 | Apr 30 | May 7 | Jun 25 – Jul 23 | 45–60 |
| Crosne | — | Apr 9 | — | Sep 10 – Nov 12 | 150–200 |
| Cucumber | Mar 26 | Apr 30 | May 7 | Jul 2 – Aug 27 | 50–70 |
| Daikon | — | Apr 9 | — | Jun 4 – Jul 2 | 50–70 |
| Delicata Squash | Mar 26 | Apr 30 | May 7 | Jul 30 – Sep 3 | 80–100 |
| Edamame | — | Apr 30 | — | Jul 16 – Aug 27 | 75–100 |
| Eggplant | Feb 19 | Apr 30 | May 7 | Jul 16 – Sep 17 | 65–85 |
| Endive | Mar 19 | Apr 9 | Apr 23 | Jun 11 – Jul 16 | 45–65 |
| Escarole | Mar 19 | Apr 9 | Apr 23 | Jun 18 – Jul 16 | 50–70 |
| Fava Beans | Mar 19 | Apr 9 | Apr 23 | Jul 9 – Aug 20 | 75–100 |
| Fennel | Mar 5 | Apr 30 | May 7 | Jul 9 – Aug 20 | 60–90 |
| Garlic | — | — | — | — | 90–240 |
| Green Beans | — | Apr 30 | — | Jun 25 – Aug 20 | 50–65 |
| Horseradish | — | — | May 7 | Sep 10 – Nov 19 | 120–180 |
| Hot Peppers | Feb 19 | Apr 30 | May 7 | Jul 16 – Oct 22 | 70–120 |
| Hubbard Squash | Mar 26 | Apr 30 | May 7 | Aug 20 – Sep 24 | 100–120 |
| Jicama | Mar 5 | Apr 30 | May 7 | Sep 10 – Nov 19 | 120–180 |
| Kabocha | Mar 26 | Apr 30 | May 7 | Aug 6 – Sep 3 | 85–100 |
| Kai Lan | Mar 19 | Apr 9 | Apr 23 | Jun 11 – Jul 9 | 45–60 |
| Kale | Mar 19 | Apr 9 | Apr 23 | Jun 18 – Aug 13 | 50–70 |
| Kidney Beans | — | Apr 30 | — | Jul 30 – Sep 3 | 85–110 |
| Kohlrabi | Mar 19 | Apr 9 | Apr 23 | Jun 11 – Jul 16 | 45–65 |
| Komatsuna | Mar 19 | Apr 9 | Apr 23 | May 28 – Jul 2 | 35–50 |
| Leeks | Mar 19 | Apr 9 | Apr 23 | Jul 23 – Oct 8 | 90–150 |
| Lentils | Mar 19 | Apr 9 | Apr 23 | Jul 16 – Aug 27 | 80–110 |
| Lettuce | Mar 19 | Apr 9 | Apr 23 | May 28 – Aug 6 | 30–60 |
| Lima Beans | — | Apr 30 | — | Jul 2 – Aug 13 | 60–90 |
| Loofah | Mar 5 | Apr 30 | May 7 | Aug 20 – Oct 22 | 100–150 |
| Luffa | Mar 5 | Apr 30 | May 7 | Aug 6 – Oct 22 | 90–150 |
| Mache | Mar 19 | Apr 9 | Apr 23 | Jun 4 – Jul 9 | 40–60 |
| Malabar Spinach | Mar 5 | Apr 30 | May 7 | Jul 2 – Jul 30 | 55–70 |
| Melon | Mar 26 | Apr 30 | May 7 | Jul 16 – Sep 3 | 70–100 |
| Microgreens | Mar 19 | Apr 9 | Apr 23 | Apr 30 – May 28 | 7–21 |
| Mitsuba | Mar 19 | Apr 9 | Apr 16 | Jun 11 – Aug 6 | 50–70 |
| Mizuna | Mar 19 | Apr 9 | Apr 23 | May 28 – Jun 25 | 30–45 |
| Mustard Greens | Mar 19 | Apr 9 | Apr 23 | May 28 – Jul 30 | 30–50 |
| Napa Cabbage | Mar 19 | Apr 9 | Apr 23 | Jun 18 – Jul 23 | 55–75 |
| New Zealand Spinach | Mar 5 | Apr 30 | May 7 | Jul 2 – Jul 30 | 55–70 |
| Okra | Mar 5 | Apr 30 | May 7 | Jul 2 – Aug 27 | 50–65 |
| Onion | Mar 19 | Apr 9 | Apr 23 | Jul 23 – Sep 10 | 90–120 |
| Pac Choi | Mar 19 | Apr 9 | Apr 23 | Jun 4 – Jul 2 | 40–55 |
| Parsnip | — | Apr 9 | — | Jul 23 – Sep 3 | 100–130 |
| Patty Pan Squash | Mar 26 | Apr 30 | May 7 | Jun 25 – Jul 23 | 45–60 |
| Peas | Mar 19 | Apr 9 | Apr 23 | Jun 18 – Aug 13 | 55–70 |
| Peppers | Feb 19 | Apr 30 | May 7 | Jul 9 – Sep 17 | 60–90 |
| Pole Beans | Mar 5 | Apr 30 | May 7 | Jul 2 – Aug 27 | 55–70 |
| Potatoes | Mar 5 | Apr 30 | May 7 | Jul 16 – Sep 24 | 70–120 |
| Pumpkin | Mar 26 | Apr 30 | May 7 | Aug 6 – Sep 24 | 85–120 |
| Purslane | Mar 19 | Apr 9 | Apr 23 | Jun 4 – Jul 9 | 40–60 |
| Radicchio | Mar 19 | Apr 9 | Apr 23 | Jun 25 – Jul 30 | 60–80 |
| Radish | — | Apr 9 | — | May 7 – May 28 | 22–35 |
| Rhubarb | — | — | May 14 | — | 365–730 |
| Romanesco | Mar 19 | Apr 9 | Apr 23 | Jul 9 – Aug 20 | 75–100 |
| Rutabaga | — | Apr 9 | — | Jul 2 – Aug 6 | 80–100 |
| Salsify | — | Apr 9 | — | Jul 23 – Sep 3 | 100–130 |
| Savoy Cabbage | Mar 19 | Apr 9 | Apr 23 | Jul 2 – Aug 27 | 70–110 |
| Scallions | Mar 19 | Apr 9 | Apr 23 | Jun 18 – Jul 16 | 50–70 |
| Scarlet Runner Beans | Mar 5 | Apr 30 | May 7 | Jul 9 – Aug 13 | 60–80 |
| Shallot | Mar 19 | Apr 9 | Apr 23 | Jul 23 – Sep 10 | 90–120 |
| Shiso | Mar 5 | Apr 30 | May 7 | Jul 2 – Aug 27 | 50–70 |
| Snap Peas | Mar 5 | Apr 30 | May 7 | Jul 2 – Aug 27 | 55–70 |
| Snow Peas | Mar 19 | Apr 9 | Apr 23 | Jun 18 – Aug 13 | 50–65 |
| Soybeans | — | Apr 30 | — | Jul 23 – Sep 17 | 80–120 |
| Spaghetti Squash | Mar 26 | Apr 30 | May 7 | Aug 6 – Sep 3 | 85–100 |
| Spinach | Mar 19 | Apr 9 | Apr 23 | May 28 – Jul 30 | 35–50 |
| Squash (Summer) | Mar 26 | Apr 30 | May 7 | Jun 25 – Aug 27 | 45–65 |
| Squash (Winter) | Mar 26 | Apr 30 | May 7 | Jul 30 – Sep 24 | 80–120 |
| Sunchoke | — | — | May 7 | Aug 27 – Oct 22 | 110–150 |
| Sunflower | Mar 5 | Apr 30 | May 7 | Jul 16 – Sep 3 | 70–100 |
| Sweet Corn | — | Apr 30 | — | Jul 2 – Aug 13 | 60–90 |
| Sweet Potatoes | Mar 5 | Apr 30 | May 7 | Aug 6 – Sep 24 | 90–120 |
| Tatsoi | Mar 19 | Apr 9 | Apr 23 | May 28 – Jul 2 | 35–50 |
| Tomatillo | Mar 5 | Apr 30 | May 7 | Jul 9 – Sep 17 | 60–85 |
| Tomatoes | Mar 5 | Apr 30 | May 7 | Jul 9 – Sep 17 | 60–85 |
| Turnip | — | Apr 9 | — | May 21 – Jun 25 | 40–60 |
| Watercress | Mar 19 | Apr 9 | Apr 23 | Jun 4 – Jul 9 | 40–60 |
| Watermelon | Mar 26 | Apr 30 | May 7 | Jul 16 – Sep 3 | 70–100 |
| Wax Beans | — | Apr 30 | — | Jun 25 – Aug 20 | 50–65 |
| Winter Melon | Mar 5 | Apr 30 | May 7 | Aug 6 – Sep 24 | 90–120 |
| Yard Long Beans | Mar 5 | Apr 30 | May 7 | Jul 2 – Aug 13 | 55–80 |
| Zucchini | Mar 26 | Apr 30 | May 7 | Jun 25 – Aug 20 | 45–60 |
🍓 Fruits to Grow in Petersburg Borough
31 fruits that grow well in Zone 7a with planting dates for Petersburg Borough.
Show all 31 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | May 14 | Aug 13 – Nov 26 | 90–180 |
| Aronia | — | — | May 14 | — | 730–1095 |
| Blackberries | — | — | May 14 | — | 365–730 |
| Blueberries | — | — | May 14 | — | 730–1095 |
| Boysenberries | — | — | May 14 | — | 365–730 |
| Cantaloupe | — | — | May 14 | Jul 23 – Aug 27 | 70–90 |
| Che Fruit | — | — | May 14 | — | 1095–1825 |
| Cranberries | — | — | May 14 | — | 730–1095 |
| Currants | — | — | May 14 | — | 730–1095 |
| Elderberries | — | — | May 14 | — | 730–1095 |
| Figs | — | — | May 14 | — | 730–1825 |
| Goji Berries | — | — | May 14 | — | 730–1095 |
| Gooseberries | — | — | May 14 | — | 730–1095 |
| Grapes | — | — | May 14 | — | 730–1095 |
| Ground Cherry | — | — | May 14 | Jul 23 – Sep 17 | 65–80 |
| Hardy Kiwi | — | — | May 14 | — | 1095–1825 |
| Haskaps | — | — | May 14 | — | 730–1095 |
| Honeydew | — | — | May 14 | Aug 6 – Sep 17 | 80–110 |
| Jostaberry | — | — | May 14 | — | 730–1095 |
| Kiwi | — | — | May 14 | — | 1095–1825 |
| Lingonberries | — | — | May 14 | — | 730–1095 |
| Loquat | — | — | May 14 | — | 730–1825 |
| Medlar | — | — | May 14 | — | 1095–1825 |
| Mulberries | — | — | May 14 | — | 730–1825 |
| Pawpaw | — | — | May 14 | — | 1095–2555 |
| Persimmon | — | — | May 14 | — | 1095–2555 |
| Pomegranate | — | — | May 14 | — | 730–1095 |
| Quince | — | — | May 14 | — | 1095–1825 |
| Raspberries | — | — | May 14 | — | 365–730 |
| Serviceberries | — | — | May 14 | — | 730–1095 |
| Strawberries | — | — | May 14 | Aug 13 – Dec 24 | 90–365 |
🌿 Herbs to Grow in Petersburg Borough
39 herbs that grow well in Zone 7a with planting dates for Petersburg Borough.
Show all 39 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Angelica | Mar 19 | Apr 9 | Apr 16 | — | 365–730 |
| Anise | Mar 19 | Apr 9 | Apr 16 | Jul 16 – Oct 1 | 90–120 |
| Basil | Mar 5 | Apr 30 | May 7 | Jul 2 – Sep 3 | 50–75 |
| Bee Balm | — | — | Apr 30 | Jul 30 – Oct 15 | 90–120 |
| Borage | Mar 19 | Apr 9 | Apr 16 | Jun 11 – Jul 30 | 50–60 |
| Caraway | Mar 19 | Apr 9 | Apr 16 | — | 365–450 |
| Catnip | — | — | Apr 30 | Jul 2 – Sep 3 | 60–80 |
| Chamomile | Mar 19 | Apr 9 | Apr 16 | Jun 18 – Aug 27 | 60–90 |
| Chervil | Mar 19 | Apr 9 | Apr 16 | May 28 – Jul 30 | 40–60 |
| Chives | — | — | Apr 30 | Jul 2 – Sep 10 | 60–90 |
| Cilantro | Mar 19 | Apr 9 | Apr 16 | May 28 – Jul 30 | 40–60 |
| Comfrey | — | — | Apr 30 | Jul 2 – Sep 10 | 60–90 |
| Cumin | Mar 19 | Apr 9 | Apr 16 | Jul 30 – Oct 1 | 100–120 |
| Dill | Mar 19 | Apr 9 | Apr 16 | May 28 – Jul 30 | 40–60 |
| Echinacea | — | — | Apr 30 | Sep 3 – Dec 10 | 120–180 |
| Epazote | Mar 5 | Apr 30 | May 7 | Jun 25 – Aug 20 | 45–60 |
| Fennel (herb) | Mar 19 | Apr 9 | Apr 16 | Jun 18 – Aug 27 | 60–90 |
| Feverfew | — | — | Apr 30 | Jul 30 – Oct 15 | 90–120 |
| Garlic Chives | — | — | Apr 30 | Jul 2 – Sep 10 | 60–90 |
| Horehound | — | — | Apr 30 | Jul 16 – Sep 10 | 75–90 |
| Hyssop | — | — | Apr 30 | Jul 9 – Sep 10 | 70–90 |
| Lavender | — | — | Apr 30 | Jul 30 – Dec 10 | 90–200 |
| Lemon Balm | — | — | Apr 30 | Jul 2 – Aug 20 | 60–70 |
| Lemon Thyme | — | — | Apr 30 | Jul 9 – Sep 10 | 70–90 |
| Lovage | — | — | Apr 30 | Jul 9 – Sep 10 | 70–90 |
| Marjoram | — | — | Apr 30 | Jul 2 – Sep 10 | 60–90 |
| Mint | — | — | Apr 30 | Jul 2 – Sep 10 | 60–90 |
| Oregano | — | — | Apr 30 | Jul 2 – Sep 10 | 60–90 |
| Parsley | Mar 19 | Apr 9 | Apr 16 | Jun 18 – Aug 20 | 60–80 |
| Rosemary | — | — | Apr 30 | Jul 23 – Dec 10 | 80–180 |
| Rue | — | — | Apr 30 | Jul 9 – Sep 10 | 70–90 |
| Sage | — | — | Apr 30 | Jul 16 – Sep 10 | 75–90 |
| Savory | — | — | Apr 30 | Jun 25 – Aug 20 | 50–70 |
| Sorrel | Mar 19 | Apr 9 | Apr 16 | May 28 – Jul 30 | 40–60 |
| Tarragon | — | — | Apr 30 | Jul 2 – Sep 10 | 60–90 |
| Thai Basil | Mar 5 | Apr 30 | May 7 | Jul 2 – Sep 3 | 50–75 |
| Thyme | — | — | Apr 30 | Jul 9 – Sep 10 | 70–90 |
| Valerian | — | — | Apr 30 | Sep 3 – Dec 10 | 120–180 |
| Yarrow | — | — | Apr 30 | Jul 30 – Oct 15 | 90–120 |
Monthly Planting Guide for Petersburg Borough
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Petersburg Borough.
Frequently Asked Questions
What planting zone is Petersburg Borough, AK?
Petersburg Borough is in USDA Hardiness Zone 7a. 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 Petersburg Borough, AK?
Based on 26 years of NOAA weather station data, the median last spring frost in Petersburg Borough falls around April 23. In 8 out of 10 years, last frost lands between April 6 and May 12 — a 36-day window of variability. Use May 12 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Petersburg Borough, AK?
The median first fall frost in Petersburg Borough arrives around October 20. In cold years it can arrive as early as October 1; in mild years as late as November 9. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Petersburg Borough?
Petersburg Borough has a frost-free growing season of approximately 180 days. This is enough time for most warm-season crops including tomatoes, peppers, and squash with proper timing. Climate records show the growing season is trending shorter by about 2.88 days per decade.
What is the soil like in Petersburg Borough for gardening?
Petersburg Borough has predominantly Silt Loam soil with a pH range of 4.9–6.3 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 Petersburg Borough?
Petersburg 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 Petersburg Borough a good location for home gardening?
Petersburg Borough scores 51/100 (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 Petersburg Borough gardeners in Zone 7a 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.
