Blog

Adams County, WA — Planting Guide

Adams County is in USDA Zone 7a. The average last spring frost is May 7 and the first fall frost is October 3, giving you a growing season of approximately 149 days.

At an elevation of 2,402 ft, Adams County receives approximately 17.1 in of rainfall annually. Summer highs average 91°F with winter lows around 23°F. The predominant soil type is Silt Loam.

🌡️ Zone

7a (0°F to 5°F min)

❄️ Last Frost

May 7

🍂 First Frost

October 3

📅 Growing Season

149 days

⛰️ Elevation

2,402 ft

🌧️ Annual Rainfall

17.1 in

Adams County, WA Short season
149 days
Last Spring Frost May 7
149 growing days
First Fall Frost October 3

Adams County Soil Profile

Soil Type

Silt Loam

Soil pH

6.0-7.0

Drainage

Well Drained

Zone 7a Frost Countdown
--
Loading...
Last Frost: May 7 First Frost: Oct 3

Soil & Growing Conditions in Adams County

Soil Type

Silt Loam

Ideal for most crops — holds moisture and nutrients while draining well.

Watering Needs

With 17.1 inches annually, regular irrigation is essential. Drip systems and heavy mulching conserve water.

Season Tips

149-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 22-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.

Instant PDF download. No spam, unsubscribe any time.

Recommended for Your Garden

🧪
Soil Test Kit $12-25

Test your soil pH, nitrogen, phosphorus, and potassium levels before planting.

📏
Digital pH Meter $10-20

Get instant, accurate soil pH readings to fine-tune your amendments.

🍂
Organic Compost $8-30

Boost soil fertility and structure with rich, well-aged organic compost.

🥬 Vegetables to Grow in Adams County

112 vegetables that grow well in Zone 7a with planting dates for Adams County.

Show all 112 vegetables with planting dates
Plant Start Indoors Direct Sow Transplant Fall Plant Harvest Days to Maturity
Acorn Squash Apr 9 May 14 May 21 Aug 13 – Sep 17 80–100
Amaranth Mar 19 May 14 May 21 Aug 20 – Oct 8 90–120
Artichoke May 21 Sep 24 – Dec 3 120–180
Arugula Apr 2 Apr 23 May 7 Jul 25 Jun 11 – Aug 13 30–50
Asparagus May 21 730–1095
Beets Apr 23 Jul 25 Jun 18 – Jul 16 50–70
Belgian Endive Apr 2 Apr 23 May 7 Jul 25 Aug 27 – Oct 22 110–150
Bitter Melon Mar 19 May 14 May 21 Jul 23 – Sep 3 60–90
Black Beans May 14 Aug 13 – Oct 1 90–120
Bok Choy Apr 2 Apr 23 May 7 Jul 25 Jun 18 – Jul 23 40–60
Broccoli Apr 2 Apr 23 May 7 Jul 25 Jul 9 – Aug 20 60–90
Broccoli Rabe Apr 2 Apr 23 May 7 Jul 25 Jun 18 – Jul 23 40–60
Brussels Sprouts Apr 2 Apr 23 May 7 Jul 25 Aug 6 – Oct 1 90–130
Butternut Squash Apr 9 May 14 May 21 Aug 20 – Sep 24 85–110
Cabbage Apr 2 Apr 23 May 7 Jul 25 Jul 9 – Sep 3 60–100
Calabash Mar 19 May 14 May 21 Aug 13 – Oct 8 80–120
Cardoon May 21 Sep 24 – Nov 5 120–150
Carrots Apr 23 Jul 25 Jun 25 – Jul 30 60–80
Cauliflower Apr 2 Apr 23 May 7 Jul 25 Jul 2 – Sep 3 55–100
Celeriac Apr 2 Apr 23 May 7 Jul 25 Aug 20 – Sep 24 100–120
Celery Apr 2 Apr 23 May 7 Jul 25 Jul 30 – Sep 24 80–120
Celtuce Apr 2 Apr 23 May 7 Jul 25 Jul 9 – Aug 20 60–90
Chard Apr 2 Apr 23 May 7 Jul 25 Jul 2 – Aug 20 50–60
Chayote Mar 19 May 14 May 21 Sep 24 – Dec 3 120–180
Chickpeas Apr 2 Apr 23 May 7 Jul 25 Jul 30 – Sep 10 80–110
Chicory Apr 2 Apr 23 May 7 Jul 25 Jul 9 – Aug 20 60–85
Chinese Cabbage Apr 2 Apr 23 May 7 Jul 25 Jul 2 – Jul 30 50–70
Christmas Lima Beans Mar 19 May 14 May 21 Aug 13 – Sep 17 80–100
Collard Greens Apr 2 Apr 23 May 7 Jul 25 Jul 2 – Sep 3 55–75
Corn May 14 Jul 16 – Sep 10 60–100
Cowpeas May 14 Jul 16 – Aug 27 60–90
Cress Apr 2 Apr 23 May 7 Jul 25 May 21 – Jun 11 14–21
Crookneck Squash Apr 9 May 14 May 21 Jul 9 – Aug 6 45–60
Crosne Apr 23 Jul 25 Sep 24 – Nov 26 150–200
Cucumber Apr 9 May 14 May 21 Jul 16 – Sep 10 50–70
Daikon Apr 23 Jul 25 Jun 18 – Jul 16 50–70
Delicata Squash Apr 9 May 14 May 21 Aug 13 – Sep 17 80–100
Edamame May 14 Jul 30 – Sep 10 75–100
Eggplant Mar 5 May 14 May 21 Jul 30 – Oct 1 65–85
Endive Apr 2 Apr 23 May 7 Jul 25 Jun 25 – Jul 30 45–65
Escarole Apr 2 Apr 23 May 7 Jul 25 Jul 2 – Jul 30 50–70
Fava Beans Apr 2 Apr 23 May 7 Jul 25 Jul 23 – Sep 3 75–100
Fennel Mar 19 May 14 May 21 Jul 23 – Sep 3 60–90
Garlic Aug 22 Nov 21 – Apr 3 90–240
Green Beans May 14 Jul 9 – Sep 3 50–65
Horseradish May 21 Sep 24 – Dec 3 120–180
Hot Peppers Mar 5 May 14 May 21 Jul 30 – Nov 5 70–120
Hubbard Squash Apr 9 May 14 May 21 Sep 3 – Oct 8 100–120
Jicama Mar 19 May 14 May 21 Sep 24 – Dec 3 120–180
Kabocha Apr 9 May 14 May 21 Aug 20 – Sep 17 85–100
Kai Lan Apr 2 Apr 23 May 7 Jul 25 Jun 25 – Jul 23 45–60
Kale Apr 2 Apr 23 May 7 Jul 25 Jul 2 – Aug 27 50–70
Kidney Beans May 14 Aug 13 – Sep 17 85–110
Kohlrabi Apr 2 Apr 23 May 7 Jul 25 Jun 25 – Jul 30 45–65
Komatsuna Apr 2 Apr 23 May 7 Jul 25 Jun 11 – Jul 16 35–50
Leeks Apr 2 Apr 23 May 7 Jul 25 Aug 6 – Oct 22 90–150
Lentils Apr 2 Apr 23 May 7 Jul 25 Jul 30 – Sep 10 80–110
Lettuce Apr 2 Apr 23 May 7 Jul 25 Jun 11 – Aug 20 30–60
Lima Beans May 14 Jul 16 – Aug 27 60–90
Loofah Mar 19 May 14 May 21 Sep 3 – Nov 5 100–150
Luffa Mar 19 May 14 May 21 Aug 20 – Nov 5 90–150
Mache Apr 2 Apr 23 May 7 Jul 25 Jun 18 – Jul 23 40–60
Malabar Spinach Mar 19 May 14 May 21 Jul 16 – Aug 13 55–70
Melon Apr 9 May 14 May 21 Jul 30 – Sep 17 70–100
Microgreens Apr 2 Apr 23 May 7 Jul 25 May 14 – Jun 11 7–21
Mitsuba Apr 2 Apr 23 Apr 30 Jul 25 Jun 25 – Aug 20 50–70
Mizuna Apr 2 Apr 23 May 7 Jul 25 Jun 11 – Jul 9 30–45
Mustard Greens Apr 2 Apr 23 May 7 Jul 25 Jun 11 – Aug 13 30–50
Napa Cabbage Apr 2 Apr 23 May 7 Jul 25 Jul 2 – Aug 6 55–75
New Zealand Spinach Mar 19 May 14 May 21 Jul 16 – Aug 13 55–70
Okra Mar 19 May 14 May 21 Jul 16 – Sep 10 50–65
Onion Apr 2 Apr 23 May 7 Jul 25 Aug 6 – Sep 24 90–120
Pac Choi Apr 2 Apr 23 May 7 Jul 25 Jun 18 – Jul 16 40–55
Parsnip Apr 23 Jul 25 Aug 6 – Sep 17 100–130
Patty Pan Squash Apr 9 May 14 May 21 Jul 9 – Aug 6 45–60
Peas Apr 2 Apr 23 May 7 Jul 25 Jul 2 – Aug 27 55–70
Peppers Mar 5 May 14 May 21 Jul 23 – Oct 1 60–90
Pole Beans Mar 19 May 14 May 21 Jul 16 – Sep 10 55–70
Potatoes Mar 19 May 14 May 21 Jul 30 – Oct 8 70–120
Pumpkin Apr 9 May 14 May 21 Aug 20 – Oct 8 85–120
Purslane Apr 2 Apr 23 May 7 Jul 25 Jun 18 – Jul 23 40–60
Radicchio Apr 2 Apr 23 May 7 Jul 25 Jul 9 – Aug 13 60–80
Radish Apr 23 Jul 25 May 21 – Jun 11 22–35
Rhubarb May 28 365–730
Romanesco Apr 2 Apr 23 May 7 Jul 25 Jul 23 – Sep 3 75–100
Rutabaga Apr 23 Jul 25 Jul 16 – Aug 20 80–100
Salsify Apr 23 Jul 25 Aug 6 – Sep 17 100–130
Savoy Cabbage Apr 2 Apr 23 May 7 Jul 25 Jul 16 – Sep 10 70–110
Scallions Apr 2 Apr 23 May 7 Jul 25 Jul 2 – Jul 30 50–70
Scarlet Runner Beans Mar 19 May 14 May 21 Jul 23 – Aug 27 60–80
Shallot Apr 2 Apr 23 May 7 Jul 25 Aug 6 – Sep 24 90–120
Shiso Mar 19 May 14 May 21 Jul 16 – Sep 10 50–70
Snap Peas Mar 19 May 14 May 21 Jul 16 – Sep 10 55–70
Snow Peas Apr 2 Apr 23 May 7 Jul 25 Jul 2 – Aug 27 50–65
Soybeans May 14 Aug 6 – Oct 1 80–120
Spaghetti Squash Apr 9 May 14 May 21 Aug 20 – Sep 17 85–100
Spinach Apr 2 Apr 23 May 7 Jul 25 Jun 11 – Aug 13 35–50
Squash (Summer) Apr 9 May 14 May 21 Jul 9 – Sep 10 45–65
Squash (Winter) Apr 9 May 14 May 21 Aug 13 – Oct 8 80–120
Sunchoke May 21 Sep 10 – Nov 5 110–150
Sweet Corn May 14 Jul 16 – Aug 27 60–90
Sweet Potatoes Mar 19 May 14 May 21 Aug 20 – Oct 8 90–120
Tatsoi Apr 2 Apr 23 May 7 Jul 25 Jun 11 – Jul 16 35–50
Tomatillo Mar 19 May 14 May 21 Jul 23 – Oct 1 60–85
Tomatoes Mar 19 May 14 May 21 Jul 23 – Oct 1 60–85
Turnip Apr 23 Jul 25 Jun 4 – Jul 9 40–60
Watercress Apr 2 Apr 23 May 7 Jul 25 Jun 18 – Jul 23 40–60
Watermelon Apr 9 May 14 May 21 Jul 30 – Sep 17 70–100
Wax Beans May 14 Jul 9 – Sep 3 50–65
Winter Melon Mar 19 May 14 May 21 Aug 20 – Oct 8 90–120
Yard Long Beans Mar 19 May 14 May 21 Jul 16 – Aug 27 55–80
Zucchini Apr 9 May 14 May 21 Jul 9 – Sep 3 45–60

🍓 Fruits to Grow in Adams County

31 fruits that grow well in Zone 7a with planting dates for Adams County.

Show all 31 fruits with planting dates
Plant Start Indoors Direct Sow Transplant Fall Plant Harvest Days to Maturity
Alpine Strawberries May 28 Aug 27 – Dec 10 90–180
Aronia May 28 730–1095
Blackberries May 28 365–730
Blueberries May 28 730–1095
Boysenberries May 28 365–730
Cantaloupe May 28 Aug 6 – Sep 10 70–90
Che Fruit May 28 1095–1825
Cranberries May 28 730–1095
Currants May 28 730–1095
Elderberries May 28 730–1095
Figs May 28 730–1825
Goji Berries May 28 730–1095
Gooseberries May 28 730–1095
Grapes May 28 730–1095
Ground Cherry May 28 Aug 6 – Oct 1 65–80
Hardy Kiwi May 28 1095–1825
Haskaps May 28 730–1095
Honeydew May 28 Aug 20 – Oct 1 80–110
Jostaberry May 28 730–1095
Kiwi May 28 1095–1825
Lingonberries May 28 730–1095
Loquat May 28 730–1825
Medlar May 28 1095–1825
Mulberries May 28 730–1825
Pawpaw May 28 1095–2555
Persimmon May 28 1095–2555
Pomegranate May 28 730–1095
Quince May 28 1095–1825
Raspberries May 28 365–730
Serviceberries May 28 730–1095
Strawberries May 28 Aug 27 – Jan 7 90–365

🌿 Herbs to Grow in Adams County

36 herbs that grow well in Zone 7a with planting dates for Adams County.

Show all 36 herbs with planting dates
Plant Start Indoors Direct Sow Transplant Fall Plant Harvest Days to Maturity
Angelica Apr 2 Apr 23 Apr 30 Jul 25 365–730
Anise Apr 2 Apr 23 Apr 30 Jul 25 Jul 30 – Oct 15 90–120
Basil Mar 19 May 14 May 21 Jul 16 – Sep 17 50–75
Bee Balm May 14 Aug 13 – Oct 29 90–120
Borage Apr 2 Apr 23 Apr 30 Jul 25 Jun 25 – Aug 13 50–60
Caraway Apr 2 Apr 23 Apr 30 Jul 25 365–450
Catnip May 14 Jul 16 – Sep 17 60–80
Chamomile Apr 2 Apr 23 Apr 30 Jul 25 Jul 2 – Sep 10 60–90
Chervil Apr 2 Apr 23 Apr 30 Jul 25 Jun 11 – Aug 13 40–60
Chives May 14 Jul 16 – Sep 24 60–90
Cilantro Apr 2 Apr 23 Apr 30 Jul 25 Jun 11 – Aug 13 40–60
Comfrey May 14 Jul 16 – Sep 24 60–90
Cumin Apr 2 Apr 23 Apr 30 Jul 25 Aug 13 – Oct 15 100–120
Dill Apr 2 Apr 23 Apr 30 Jul 25 Jun 11 – Aug 13 40–60
Epazote Mar 19 May 14 May 21 Jul 9 – Sep 3 45–60
Fennel (herb) Apr 2 Apr 23 Apr 30 Jul 25 Jul 2 – Sep 10 60–90
Feverfew May 14 Aug 13 – Oct 29 90–120
Garlic Chives May 14 Jul 16 – Sep 24 60–90
Horehound May 14 Jul 30 – Sep 24 75–90
Hyssop May 14 Jul 23 – Sep 24 70–90
Lemon Balm May 14 Jul 16 – Sep 3 60–70
Lemon Thyme May 14 Jul 23 – Sep 24 70–90
Lovage May 14 Jul 23 – Sep 24 70–90
Marjoram May 14 Jul 16 – Sep 24 60–90
Mint May 14 Jul 16 – Sep 24 60–90
Oregano May 14 Jul 16 – Sep 24 60–90
Parsley Apr 2 Apr 23 Apr 30 Jul 25 Jul 2 – Sep 3 60–80
Rosemary May 14 Aug 6 – Dec 24 80–180
Rue May 14 Jul 23 – Sep 24 70–90
Sage May 14 Jul 30 – Sep 24 75–90
Savory May 14 Jul 9 – Sep 3 50–70
Sorrel Apr 2 Apr 23 Apr 30 Jul 25 Jun 11 – Aug 13 40–60
Tarragon May 14 Jul 16 – Sep 24 60–90
Thai Basil Mar 19 May 14 May 21 Jul 16 – Sep 17 50–75
Thyme May 14 Jul 23 – Sep 24 70–90
Valerian May 14 Sep 17 – Dec 24 120–180

🌸 Flowers to Grow in Adams County

53 flowers that grow well in Zone 7a with planting dates for Adams County.

Show all 53 flowers with planting dates
Plant Start Indoors Direct Sow Transplant Fall Plant Bloom Days to Maturity
Ageratum Mar 26 May 7 May 7 Jul 2 – Oct 22 60–75
Alliums Aug 29 Sep 26 – Oct 17 28–42
Anemones Aug 8 Aug 22 – Sep 19 90–120
Astilbe Mar 5 May 14 Jul 23 – Sep 17 70–100
Bachelor's Button Mar 26 Apr 2 May 7 Aug 8 Jul 9 – Oct 8 60–90
Begonias Feb 26 May 7 Jul 16 – Nov 5 70–90
Black-eyed Susan Mar 5 May 7 May 14 Jul 23 – Nov 26 60–80
Bleeding Hearts Mar 5 May 14 Jul 2 – Aug 6 60–90
Calendula Mar 26 Apr 2 May 7 Aug 8 Jun 25 – Oct 8 50–70
California Poppy Apr 9 Aug 8 Jun 18 – Aug 27 60–90
Celosia Apr 9 May 7 May 7 Jul 9 – Nov 5 60–90
Columbine Mar 12 May 14 May 14 Jul 2 – Aug 6 70–100
Coreopsis Mar 5 May 7 May 14 Jul 16 – Nov 26 60–80
Cosmos Apr 9 May 7 May 7 Jul 16 – Nov 5 60–90
Crocus Aug 29 Jul 25 – Aug 15 10–20
Daffodils Aug 29 Aug 1 – Aug 22 20–40
Dahlias Apr 9 May 14 May 14 Jul 23 – Nov 26 70–120
Daylily Mar 5 May 14 Jul 23 – Nov 26 60–90
Dianthus Mar 12 Apr 2 Apr 16 Jun 4 – Sep 3 60–80
Echinacea (Purple Coneflower) Mar 5 May 14 May 14 Jul 30 – Nov 26 70–90
Foxglove Mar 12 May 14 May 14 Jul 2 – Aug 6 80–120
Gaillardia (Blanket Flower) Mar 19 May 14 May 14 Jul 23 – Dec 10 70–100
Geraniums Feb 26 May 7 Jul 16 – Nov 5 70–100
Gladiolus May 7 May 7 Jul 16 – Nov 19 70–100
Hostas Feb 26 May 14 Jul 23 – Nov 26 60–90
Hyacinths Aug 29 Aug 22 – Sep 12 14–28
Hydrangeas Feb 26 May 14 Jul 23 – Nov 12 90–150
Impatiens Mar 12 May 14 Jul 23 – Nov 12 60–75
Irises Division May 14 Jul 2 – Aug 6 60–100
Larkspur Apr 9 Jul 25 Jun 18 – Aug 27 60–90
Lavender Mar 5 May 21 Jul 30 – Oct 8 90–120
Lilies Division May 14 Jul 23 – Nov 12 70–120
Lobelia Mar 5 Apr 16 Jun 11 – Sep 3 70–80
Lupine Mar 12 May 14 May 14 Jul 2 – Aug 6 75–100
Marigolds Mar 26 May 7 May 7 Jul 2 – Oct 8 50–70
Nasturtium Apr 9 May 7 May 7 Jul 2 – Nov 5 55–65
Pansy Feb 26 May 7 Jul 25 Jul 2 – Sep 10 70–90
Peonies Division May 14 Jul 9 – Aug 13 90–120
Petunia Mar 12 May 14 Jul 23 – Nov 12 70–90
Phlox Mar 5 May 14 May 14 Jul 23 – Oct 15 80–110
Portulaca Apr 9 May 7 May 7 Jun 25 – Oct 22 50–70
Ranunculus Aug 8 Sep 5 – Oct 3 90–120
Roses Feb 26 May 14 Jul 23 – Nov 26 90–180
Salvia Mar 12 May 7 Jul 16 – Nov 5 70–90
Sedum (Stonecrop) Mar 5 May 14 Sep 3 – Nov 26 60–90
Snapdragon Feb 26 Apr 9 May 7 Aug 8 Jul 16 – Oct 8 70–100
Sunflower Apr 16 May 7 May 7 Jul 30 – Nov 5 70–100
Sweet Alyssum Mar 26 Apr 9 May 7 Aug 22 Jun 18 – Sep 10 45–60
Sweet Pea Apr 2 Aug 8 Jun 11 – Sep 3 65–85
Tulips Aug 29 Aug 15 – Sep 5 15–30
Vinca (Annual) Feb 26 May 7 Jul 16 – Nov 5 70–90
Yarrow Mar 5 May 7 May 14 Jul 16 – Nov 26 60–90
Zinnia Apr 9 May 7 May 7 Jul 16 – Nov 5 60–70

Monthly Planting Guide for Adams County

Gardening Guides & Resources

Helpful guides from The Ultimate Homestead to improve your garden in Adams County.

Frequently Asked Questions

What planting zone is Adams County, WA?

Adams County 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 Adams County, WA?

Based on 30 years of NOAA weather station data, the median last spring frost in Adams County falls around May 7. Plan transplants and direct-sow dates relative to this date.

When is the first fall frost in Adams County, WA?

The median first fall frost in Adams County arrives around October 3. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.

🌱

Your Adams County Garden Planner — Free

A 22-page printable planner built for Adams County (Zone 7a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.

Instant PDF download. No spam, unsubscribe any time.

Best Seller
The Gardener's Encyclopedia to Companion Planting

The Gardener's Encyclopedia to Companion Planting

$27 $293 value

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
See what's inside →
Reader favourite
Seed Saving & Storage Guide

Seed Saving & Storage Guide

$27 $157 value

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
Save a lifetime of seed money →
Composting Guide for Homesteaders

Composting Guide for Homesteaders

$27 $210 value

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
Start composting today →

Data sources: USDA Plant Hardiness Zone Map (2023), NOAA 30-Year Climate Normals. Frost dates represent 50% probability averages; local conditions vary by elevation and microclimate. Last updated: July 2026.

Sources & credits

Every number on this page traces back to a primary horticulture or government data source. Click through to verify.