Lake County, CO — Planting Guide
Lake County is in USDA Zone 4a. The average last spring frost is June 21 and the first fall frost is August 30, giving you a growing season of approximately 70 days.
At an elevation of 7,687 ft, Lake County receives approximately 21.2 in of rainfall annually. Summer highs average 83°F with winter lows around 5°F. The predominant soil type is Loam.
Based on 31 years of NOAA climate station data, the last frost date here varies by 14 days year to year — ranging from June 13 in warm years to June 27 in cold years. The growing season is trending longer by about 0.86 days per decade. Lake County scores 52/100 (Moderate) on the Microclimate Index.
🌡️ Zone
4a (-30°F to -25°F min)
❄️ Last Frost
June 21
🍂 First Frost
August 30
📅 Growing Season
70 days
⛰️ Elevation
7,687 ft
🌧️ Annual Rainfall
21.2 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 | 1.5 in | 7 days | — | None |
| Feb | 1.1 in | 6 days | — | None |
| Mar | 1.8 in | 8 days | — | None |
| Apr | 2.1 in | 8 days | 2.2 in | High |
| May | 2.7 in | 8 days | 1.6 in | High |
| Jun | 1.4 in | 5 days | 2.9 in | High |
| Jul | 2.1 in | 6 days | 2.2 in | High |
| Aug | 2.2 in | 5 days | 2.1 in | High |
| Sep | 1.6 in | 6 days | 2.7 in | High |
| Oct | 2.1 in | 6 days | 2.2 in | High |
| Nov | 1.6 in | 6 days | — | None |
| Dec | 1.2 in | 7 days | — | None |
Annual total: 21.4 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.
Lake County Soil Profile
Soil Type
Loam
Soil pH
6.6-8.2
Drainage
Well Drained
Frost Risk Probability
Based on 31 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) | Jun 27 | Sep 10 | 75 days |
| Cautious | Jun 24 | Sep 5 | 73 days |
| Average year | Jun 21 | Aug 30 | 70 days |
| Optimistic | Jun 16 | Aug 18 | 63 days |
| Aggressive (risky) | Jun 13 | Aug 12 | 60 days |
Moderately predictable (±14 day range). The "Cautious" dates in the table below are a safe bet.
Slightly — seasons are trending a bit longer (0.9 days/decade). Historical frost dates are still reliable for planning.
Gardening Difficulty Score
Lake County presents some gardening challenges. Choose adapted varieties and plan around frost dates.
Local Gardening Help in Lake County
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 Lake County's climate and soil.
County Extension Office
Lake County Colorado State University Extension Extension Office
Phone: 970-491-6281
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 Lake County
Finding local nurseries & garden centers in Lake County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Lake County'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 Lake County CO" or "garden center Lake County" 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 Lake County CO" or check your extension office and local parks department. Facebook groups like "Lake County Gardeners" or "Colorado Gardening" are also excellent for local advice and plant swaps.
Sunlight & Day Length
Monthly daylight hours and peak sun — critical for onion varieties, photoperiod-sensitive plants, and solar garden planning.
Longest Day
14.7 hours
Summer solstice daylight
Shortest Day
9.3 hours
Winter solstice daylight
Peak Sun Hours
11 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 | 9.5 hr | 5.3 hr | Short day |
| February | 10.5 hr | 6.2 hr | Short day |
| March | 11.7 hr | 6.8 hr | Short day |
| April | 13 hr | 7.9 hr | Neutral |
| May | 14.1 hr | 8.7 hr | Long day |
| June | 14.7 hr | 11 hr | Long day |
| July | 14.5 hr | 10 hr | Long day |
| August | 13.5 hr | 9.2 hr | Neutral |
| September | 12.2 hr | 9 hr | Neutral |
| October | 10.9 hr | 7.3 hr | Short day |
| November | 9.8 hr | 5.6 hr | Short day |
| December | 9.3 hr | 5.2 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 rarely reaches 60°F — use black plastic mulch to warm soil.
Best Month to Compost
Jul
Microbial activity peaks when soil is warm.
Active Composting
2 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 | -8°F | 2°F | ❄️ Dormant | ~36 weeks |
| Feb | -7°F | 2°F | ❄️ Dormant | ~36 weeks |
| Mar | 3°F | 7°F | ❄️ Dormant | ~36 weeks |
| Apr | 18°F | 17°F | ❄️ Dormant | ~36 weeks |
| May | 34°F | 29°F | ❄️ Dormant | ~36 weeks |
| Jun | 42°F | 38°F | 🐢 Slow | ~24 weeks |
| Jul | 52°F | 45°F | ♻️ Active | ~14 weeks |
| Aug | 51°F | 45°F | ♻️ Active | ~14 weeks |
| Sep | 42°F | 43°F | 🐢 Slow | ~24 weeks |
| Oct | 32°F | 33°F | ❄️ Dormant | ~36 weeks |
| Nov | 16°F | 22°F | ❄️ Dormant | ~36 weeks |
| Dec | 0°F | 10°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 Lake County
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 5 common pests in your area
| Pest | Risk Level | Peak Months |
|---|---|---|
| Aphids | Moderate | May, Jun, Jul, Aug |
| Cabbage worms | Moderate | Jun, Jul, Aug |
| Colorado potato beetle | Low | Jun, Jul |
| Flea beetles | Moderate | May, Jun, Jul |
| Slugs | Low | May, Jun, Jul, Aug, Sep |
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
Cover Crops for Lake County
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with county-specific planting dates.
Fall Cover Crops (5 options) — Plant after harvest to protect soil over winter
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Daikon radish | Jul 6 | Jun 7 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Jun 12 | Jun 7 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Jul 29 | May 31 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jun 2 | Jun 7 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jun 1 | Jun 7 | — | Erosion control, weed suppression, good biomass |
Spring Cover Crops (2 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | Jun 26 | Jun 28 | — | Rapid growth, attracts pollinators, suppresses weeds |
| White clover | May 21 | Jul 5 | ✓ 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 | Jul 20 | Aug 16 | — | 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: 15 mph Summer: 11 mph
Fall: 11 mph Winter: 17 mph
Prevailing wind: W. Windy area — plant a windbreak hedge on the W side of your garden.
Windbreak Benefit
7/10
Strongly recommended — a windbreak (fence, hedge, or row of tall crops like corn or sunflowers) will significantly improve garden yields.
Frost Pocket Risk
High
Hilly terrain with 2,803 ft of elevation range — cold air pools in low spots. Avoid planting frost-sensitive crops in valleys.
Rainwater Harvesting Potential
How much water you can collect, when to collect it, and what size system you need for your garden.
Annual Collection
10,665 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 1,750 gal tank.
Legal Status
Limited
Your state has quantity limits on rainwater collection — check local regulations before installing large systems.
Best Collection Months
Apr, May, Jul, Aug
Highest rainfall months — your barrels will fill up quickly during these months.
Months to Draw From Storage
Feb, Jun, Dec
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 21.4 inches of rain per year
- A 1,000 sq ft roof can collect roughly 10,665 gallons annually
- Check CO state regulations — rainwater harvesting has quantity limits
- Stock up on stored water before your dry season (Feb, Jun, Dec)
- Use a first-flush diverter to keep roof debris out of your collection
Soil & Growing Conditions in Lake County
Soil Type
Loam
Soil pH 6.6–8.2 · Well Drained drainage
Good candidate for raised beds to maximise drainage and extend the season.
Watering Needs
Drought stress: 5.5/10
Moderate drought pressure. Drip irrigation and mulching are highly recommended to maintain soil moisture through summer.
Season Tips
70-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 Lake County
96 vegetables that grow well in Zone 4a with planting dates for Lake County.
Show all 96 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | May 10 | Jul 5 | Jul 12 | Oct 4 – Nov 8 | 80–100 |
| Amaranth | Apr 19 | Jul 5 | Jul 12 | Oct 11 – Nov 29 | 90–120 |
| Arugula | May 10 | Jun 14 | Jun 21 | Jul 26 – Sep 27 | 30–50 |
| Asparagus | — | — | Jul 5 | — | 730–1095 |
| Beets | — | Jun 14 | — | Aug 9 – Sep 6 | 50–70 |
| Belgian Endive | May 10 | Jun 14 | Jun 21 | Oct 11 – Nov 15 | 110–150 |
| Black Beans | — | Jul 5 | — | Oct 4 – Nov 22 | 90–120 |
| Bok Choy | May 10 | Jun 14 | Jun 21 | Aug 2 – Sep 6 | 40–60 |
| Broccoli | May 10 | Jun 14 | Jun 21 | Aug 23 – Oct 4 | 60–90 |
| Broccoli Rabe | May 10 | Jun 14 | Jun 21 | Aug 2 – Sep 6 | 40–60 |
| Brussels Sprouts | May 10 | Jun 14 | Jun 21 | Sep 20 – Nov 15 | 90–130 |
| Butternut Squash | May 10 | Jul 5 | Jul 12 | Oct 11 – Nov 15 | 85–110 |
| Cabbage | May 10 | Jun 14 | Jun 21 | Aug 23 – Oct 18 | 60–100 |
| Carrots | — | Jun 14 | — | Aug 16 – Sep 20 | 60–80 |
| Cauliflower | May 10 | Jun 14 | Jun 21 | Aug 16 – Oct 18 | 55–100 |
| Celeriac | May 10 | Jun 14 | Jun 21 | Oct 4 – Nov 8 | 100–120 |
| Celery | May 10 | Jun 14 | Jun 21 | Sep 13 – Nov 8 | 80–120 |
| Celtuce | May 10 | Jun 14 | Jun 21 | Aug 23 – Oct 4 | 60–90 |
| Chard | May 10 | Jun 14 | Jun 21 | Aug 16 – Oct 4 | 50–60 |
| Chickpeas | May 10 | Jun 14 | Jun 21 | Sep 13 – Oct 25 | 80–110 |
| Chicory | May 10 | Jun 14 | Jun 21 | Aug 23 – Oct 4 | 60–85 |
| Chinese Cabbage | May 10 | Jun 14 | Jun 21 | Aug 16 – Sep 13 | 50–70 |
| Christmas Lima Beans | Apr 19 | Jul 5 | Jul 12 | Oct 4 – Nov 8 | 80–100 |
| Collard Greens | May 10 | Jun 14 | Jun 21 | Aug 16 – Oct 18 | 55–75 |
| Corn | — | Jul 5 | — | Sep 6 – Nov 1 | 60–100 |
| Cress | May 10 | Jun 14 | Jun 21 | Jul 5 – Jul 26 | 14–21 |
| Crookneck Squash | May 10 | Jul 5 | Jul 12 | Aug 30 – Sep 27 | 45–60 |
| Crosne | — | Jun 14 | — | Nov 15 – Nov 8 | 150–200 |
| Cucumber | May 10 | Jul 5 | Jul 12 | Sep 6 – Nov 1 | 50–70 |
| Daikon | — | Jun 14 | — | Aug 9 – Sep 6 | 50–70 |
| Delicata Squash | May 10 | Jul 5 | Jul 12 | Oct 4 – Nov 8 | 80–100 |
| Edamame | — | Jul 5 | — | Sep 20 – Nov 1 | 75–100 |
| Endive | May 10 | Jun 14 | Jun 21 | Aug 9 – Sep 13 | 45–65 |
| Escarole | May 10 | Jun 14 | Jun 21 | Aug 16 – Sep 13 | 50–70 |
| Fava Beans | May 10 | Jun 14 | Jun 21 | Sep 6 – Oct 18 | 75–100 |
| Fennel | Apr 19 | Jul 5 | Jul 12 | Sep 13 – Oct 25 | 60–90 |
| Garlic | — | — | — | — | 90–240 |
| Green Beans | — | Jul 5 | — | Aug 30 – Oct 25 | 50–65 |
| Horseradish | — | — | Jul 5 | Nov 8 – Nov 29 | 120–180 |
| Hubbard Squash | May 10 | Jul 5 | Jul 12 | Oct 25 – Nov 29 | 100–120 |
| Kabocha | May 10 | Jul 5 | Jul 12 | Oct 11 – Nov 8 | 85–100 |
| Kai Lan | May 10 | Jun 14 | Jun 21 | Aug 9 – Sep 6 | 45–60 |
| Kale | May 10 | Jun 14 | Jun 21 | Aug 16 – Oct 11 | 50–70 |
| Kidney Beans | — | Jul 5 | — | Oct 4 – Nov 8 | 85–110 |
| Kohlrabi | May 10 | Jun 14 | Jun 21 | Aug 9 – Sep 13 | 45–65 |
| Komatsuna | May 10 | Jun 14 | Jun 21 | Jul 26 – Aug 30 | 35–50 |
| Leeks | May 10 | Jun 14 | Jun 21 | Sep 20 – Nov 15 | 90–150 |
| Lentils | May 10 | Jun 14 | Jun 21 | Sep 13 – Oct 25 | 80–110 |
| Lettuce | May 10 | Jun 14 | Jun 21 | Jul 26 – Oct 4 | 30–60 |
| Lima Beans | — | Jul 5 | — | Sep 6 – Oct 18 | 60–90 |
| Mache | May 10 | Jun 14 | Jun 21 | Aug 2 – Sep 6 | 40–60 |
| Melon | May 10 | Jul 5 | Jul 12 | Sep 20 – Nov 8 | 70–100 |
| Microgreens | May 10 | Jun 14 | Jun 21 | Jun 28 – Jul 26 | 7–21 |
| Mitsuba | May 10 | Jun 14 | Jun 14 | Aug 9 – Oct 4 | 50–70 |
| Mizuna | May 10 | Jun 14 | Jun 21 | Jul 26 – Aug 23 | 30–45 |
| Mustard Greens | May 10 | Jun 14 | Jun 21 | Jul 26 – Sep 27 | 30–50 |
| Napa Cabbage | May 10 | Jun 14 | Jun 21 | Aug 16 – Sep 20 | 55–75 |
| Onion | May 10 | Jun 14 | Jun 21 | Sep 20 – Nov 8 | 90–120 |
| Pac Choi | May 10 | Jun 14 | Jun 21 | Aug 2 – Aug 30 | 40–55 |
| Parsnip | — | Jun 14 | — | Sep 27 – Nov 8 | 100–130 |
| Patty Pan Squash | May 10 | Jul 5 | Jul 12 | Aug 30 – Sep 27 | 45–60 |
| Peas | May 10 | Jun 14 | Jun 21 | Aug 16 – Oct 11 | 55–70 |
| Peppers | Apr 5 | Jul 5 | Jul 12 | Sep 13 – Nov 22 | 60–90 |
| Pole Beans | Apr 19 | Jul 5 | Jul 12 | Sep 6 – Nov 1 | 55–70 |
| Potatoes | Apr 19 | Jul 5 | Jul 12 | Sep 20 – Nov 29 | 70–120 |
| Pumpkin | May 10 | Jul 5 | Jul 12 | Oct 11 – Nov 29 | 85–120 |
| Purslane | May 10 | Jun 14 | Jun 21 | Aug 2 – Sep 6 | 40–60 |
| Radicchio | May 10 | Jun 14 | Jun 21 | Aug 23 – Sep 27 | 60–80 |
| Radish | — | Jun 14 | — | Jul 12 – Aug 2 | 22–35 |
| Rhubarb | — | — | Jul 19 | — | 365–730 |
| Romanesco | May 10 | Jun 14 | Jun 21 | Sep 6 – Oct 18 | 75–100 |
| Rutabaga | — | Jun 14 | — | Sep 6 – Oct 11 | 80–100 |
| Salsify | — | Jun 14 | — | Sep 27 – Nov 8 | 100–130 |
| Savoy Cabbage | May 10 | Jun 14 | Jun 21 | Aug 30 – Oct 25 | 70–110 |
| Scallions | May 10 | Jun 14 | Jun 21 | Aug 16 – Sep 13 | 50–70 |
| Scarlet Runner Beans | Apr 19 | Jul 5 | Jul 12 | Sep 13 – Oct 18 | 60–80 |
| Shallot | May 10 | Jun 14 | Jun 21 | Sep 20 – Nov 8 | 90–120 |
| Shiso | Apr 26 | Jun 28 | Jul 12 | Sep 6 – Nov 1 | 50–70 |
| Snap Peas | Apr 19 | Jul 5 | Jul 12 | Sep 6 – Nov 1 | 55–70 |
| Snow Peas | May 10 | Jun 14 | Jun 21 | Aug 16 – Oct 11 | 50–65 |
| Soybeans | — | Jul 5 | — | Sep 27 – Nov 22 | 80–120 |
| Spaghetti Squash | May 10 | Jul 5 | Jul 12 | Oct 11 – Nov 8 | 85–100 |
| Spinach | May 10 | Jun 14 | Jun 21 | Jul 26 – Sep 27 | 35–50 |
| Squash (Summer) | May 10 | Jul 5 | Jul 12 | Aug 30 – Nov 1 | 45–65 |
| Squash (Winter) | May 10 | Jul 5 | Jul 12 | Oct 4 – Nov 29 | 80–120 |
| Sunchoke | — | — | Jul 5 | Oct 25 – Nov 29 | 110–150 |
| Sunflower | Apr 19 | Jul 5 | Jul 12 | Sep 20 – Nov 8 | 70–100 |
| Sweet Corn | — | Jul 5 | — | Sep 6 – Oct 18 | 60–90 |
| Tatsoi | May 10 | Jun 14 | Jun 21 | Jul 26 – Aug 30 | 35–50 |
| Tomatillo | Apr 19 | Jul 5 | Jul 12 | Sep 13 – Nov 22 | 60–85 |
| Tomatoes | Apr 19 | Jul 5 | Jul 12 | Sep 13 – Nov 22 | 60–85 |
| Turnip | — | Jun 14 | — | Jul 26 – Aug 30 | 40–60 |
| Watercress | May 10 | Jun 14 | Jun 21 | Aug 2 – Sep 6 | 40–60 |
| Watermelon | May 10 | Jul 5 | Jul 12 | Sep 20 – Nov 8 | 70–100 |
| Wax Beans | — | Jul 5 | — | Aug 30 – Oct 25 | 50–65 |
| Zucchini | May 10 | Jul 5 | Jul 12 | Aug 30 – Oct 25 | 45–60 |
🍓 Fruits to Grow in Lake County
22 fruits that grow well in Zone 4a with planting dates for Lake County.
Show all 22 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | Jul 19 | Oct 18 – Dec 13 | 90–180 |
| Aronia | — | — | Jul 19 | — | 730–1095 |
| Blueberries | — | — | Jul 19 | — | 730–1095 |
| Cantaloupe | — | — | Jul 19 | Sep 27 – Nov 1 | 70–90 |
| Cranberries | — | — | Jul 19 | — | 730–1095 |
| Currants | — | — | Jul 19 | — | 730–1095 |
| Elderberries | — | — | Jul 19 | — | 730–1095 |
| Goji Berries | — | — | Jul 19 | — | 730–1095 |
| Gooseberries | — | — | Jul 19 | — | 730–1095 |
| Grapes | — | — | Jul 19 | — | 730–1095 |
| Ground Cherry | — | — | Jul 19 | Sep 27 – Nov 22 | 65–80 |
| Hardy Kiwi | — | — | Jul 19 | — | 1095–1825 |
| Haskaps | — | — | Jul 19 | — | 730–1095 |
| Honeydew | — | — | Jul 19 | Oct 11 – Nov 22 | 80–110 |
| Jostaberry | — | — | Jul 19 | — | 730–1095 |
| Lingonberries | — | — | Jul 19 | — | 730–1095 |
| Medlar | — | — | Jul 19 | — | 1095–1825 |
| Mulberries | — | — | Jul 19 | — | 730–1825 |
| Persimmon | — | — | Jul 19 | — | 1095–2555 |
| Raspberries | — | — | Jul 19 | — | 365–730 |
| Serviceberries | — | — | Jul 19 | — | 730–1095 |
| Strawberries | — | — | Jul 19 | Oct 18 – Dec 13 | 90–365 |
🌿 Herbs to Grow in Lake County
32 herbs that grow well in Zone 4a with planting dates for Lake County.
Show all 32 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Angelica | May 10 | Jun 14 | Jun 14 | — | 365–730 |
| Anise | May 10 | Jun 14 | Jun 14 | Sep 13 – Nov 8 | 90–120 |
| Basil | Apr 26 | Jun 28 | Jul 12 | Sep 6 – Nov 8 | 50–75 |
| Bee Balm | — | — | Jun 28 | Sep 27 – Nov 22 | 90–120 |
| Borage | May 10 | Jun 14 | Jun 14 | Aug 9 – Sep 27 | 50–60 |
| Caraway | May 10 | Jun 14 | Jun 14 | — | 365–450 |
| Catnip | — | — | Jun 28 | Aug 30 – Nov 1 | 60–80 |
| Chamomile | May 10 | Jun 14 | Jun 14 | Aug 16 – Oct 25 | 60–90 |
| Chervil | May 10 | Jun 14 | Jun 14 | Jul 26 – Sep 27 | 40–60 |
| Chives | — | — | Jun 28 | Aug 30 – Nov 8 | 60–90 |
| Cilantro | May 10 | Jun 14 | Jun 14 | Jul 26 – Sep 27 | 40–60 |
| Comfrey | — | — | Jun 28 | Aug 30 – Nov 8 | 60–90 |
| Dill | May 10 | Jun 14 | Jun 14 | Jul 26 – Sep 27 | 40–60 |
| Echinacea | — | — | Jun 28 | Nov 1 – Nov 22 | 120–180 |
| Fennel (herb) | May 10 | Jun 14 | Jun 14 | Aug 16 – Oct 25 | 60–90 |
| Garlic Chives | — | — | Jun 28 | Aug 30 – Nov 8 | 60–90 |
| Horehound | — | — | Jun 28 | Sep 13 – Nov 8 | 75–90 |
| Hyssop | — | — | Jun 28 | Sep 6 – Nov 8 | 70–90 |
| Lemon Balm | — | — | Jun 28 | Aug 30 – Oct 18 | 60–70 |
| Lovage | — | — | Jun 28 | Sep 6 – Nov 8 | 70–90 |
| Mint | — | — | Jun 28 | Aug 30 – Nov 8 | 60–90 |
| Oregano | — | — | Jun 28 | Aug 30 – Nov 8 | 60–90 |
| Parsley | May 10 | Jun 14 | Jun 14 | Aug 16 – Oct 18 | 60–80 |
| Rue | — | — | Jun 28 | Sep 6 – Nov 8 | 70–90 |
| Sage | — | — | Jun 28 | Sep 13 – Nov 8 | 75–90 |
| Savory | — | — | Jun 28 | Aug 23 – Oct 18 | 50–70 |
| Sorrel | May 10 | Jun 14 | Jun 14 | Jul 26 – Sep 27 | 40–60 |
| Tarragon | — | — | Jun 28 | Aug 30 – Nov 8 | 60–90 |
| Thai Basil | Apr 26 | Jun 28 | Jul 12 | Sep 6 – Nov 8 | 50–75 |
| Thyme | — | — | Jun 28 | Sep 6 – Nov 8 | 70–90 |
| Valerian | — | — | Jun 28 | Nov 1 – Nov 22 | 120–180 |
| Yarrow | — | — | Jun 28 | Sep 27 – Nov 22 | 90–120 |
Monthly Planting Guide for Lake County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Lake County.
Frequently Asked Questions
What planting zone is Lake County, CO?
Lake County is in USDA Hardiness Zone 4a. 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 Lake County, CO?
Based on 31 years of NOAA weather station data, the median last spring frost in Lake County falls around June 21. In 8 out of 10 years, last frost lands between June 13 and June 27 — a 14-day window of variability. Use June 27 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Lake County, CO?
The median first fall frost in Lake County arrives around August 30. In cold years it can arrive as early as August 12; in mild years as late as September 10. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Lake County?
Lake County has a frost-free growing season of approximately 70 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 0.86 days per decade.
What is the soil like in Lake County for gardening?
Lake County has predominantly Loam soil with a pH range of 6.6–8.2 and Well Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Lake County?
Lake County has commercial agriculture that includes Cattle, Hay, Wheat, Barley, Sugar Beets. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Lake County a good location for home gardening?
Lake County scores 52/100 (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 Lake County gardeners in Zone 4a 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.
