Frost Dates for Evergreen, CO 80439
Last spring frost June 10 · First fall frost September 16 · 98 frost-free days · USDA Zone 5b
ZIP 80439 has about 24,600 people.
Short season: 98 frost-free days. Spring frost risk spans May 18–July 3 (46 days). Fall frost risk spans September 1–September 28 (27 days).
Frost probability for 80439
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | July 3 | June 10 | May 18 |
| Fall (first frost) | September 1 | September 16 | September 28 |
Dates come from NOAA 1971–2000 freeze probabilities at GEORGETOWN (24.4 km away); the 50% date is the median year.
Which crops fit a 98-day season in Evergreen
In Evergreen (98 frost-free days, a short season), 29 of 56 planner crops fit outright, 14 get two plantings, 5 need an indoor start, 7 don't reliably mature, 1 crop is perennial.
| Crop | Start indoors | Plant out / sow | Days you have | Verdict | Last sow date |
|---|---|---|---|---|---|
| Tomato | May 6 | Jun 24–Jul 1 | 56 | no-fit: Needs 80 days; Evergreen has 56 after Jun 24. | — |
| Pepper | Apr 29 | Jun 24–Jul 1 | 56 | head-start: Even planted out Jun 24, the outdoor season is about 19 days short; choose an early variety or grow under cover. | — |
| Lettuce | Apr 15 | May 13–May 20 | 133 | two-plantings: Plant May 13 and again by Jul 26; both mature before Sep 23. | Jul 26 |
| Carrots | — | May 20–May 27 | 140 | fits: 70 days to maturity, 140 available after May 20. | Jul 15 |
| Cucumber | May 20 | Jun 24–Jul 1 | 70 | fits: 60 days to maturity, 70 available after Jun 24. | — |
| Beans | — | Jun 17–Jul 1 | 84 | fits: 60 days to maturity, 84 available after Jun 17. | Jun 27 |
| Peas | — | Apr 15–Jun 24 | 161 | fits: 65 days to maturity, 161 available after Apr 15. | Jul 6 |
| Zucchini | May 27 | Jun 24–Jul 1 | 70 | fits: 55 days to maturity, 70 available after Jun 24. | Jun 25 |
| Onion | Mar 18 | May 13–May 27 | 133 | fits: 100 days to maturity, 133 available after May 13. | — |
| Spinach | — | Apr 15–Jun 3 | 175 | two-plantings: Plant Apr 15 and again by Aug 14; both mature before Oct 7. | Aug 14 |
| Kale | Apr 1 | May 13–May 27 | 147 | two-plantings: Plant May 13 and again by Jul 30; both mature before Oct 7. | Jul 30 |
| Broccoli | Apr 15 | May 13–May 27 | 133 | fits: 80 days to maturity, 133 available after May 13. | Jun 21 |
| Cabbage | Apr 15 | May 13–May 27 | 147 | fits: 70 days to maturity, 147 available after May 13. | Jul 15 |
| Radish | — | Apr 15–Jul 8 | 161 | two-plantings: Plant Apr 15 and again by Aug 15; both mature before Sep 23. | Aug 15 |
| Beets | — | Apr 15–Jul 8 | 161 | two-plantings: Plant Apr 15 and again by Jul 16; both mature before Sep 23. | Jul 16 |
| Potatoes | — | May 27–Jun 3 | 119 | fits: 90 days to maturity, 119 available after May 27. | — |
| Garlic | — | Sep 16 | 203 | overwinter: Plant Sep 16 to Oct 7; harvest the following summer. | Oct 7 |
| Strawberry | — | May 6–Jul 1 | 154 | perennial: A perennial: plant May 6; it fruits from the following year and keeps producing for several years. | — |
| Corn | May 13 | Jun 17–Jun 24 | 70 | head-start: Even planted out Jun 17, the outdoor season is about 5 days short; choose an early variety or grow under cover. | — |
| Pumpkin | May 27 | Jun 24–Jun 24 | 63 | no-fit: Needs 100 days; Evergreen has 63 after Jun 24. | — |
| Cauliflower | Apr 29 | Jun 3–Jun 17 | 112 | fits: 75 days to maturity, 112 available after Jun 3. | Jun 26 |
| Swiss Chard | Apr 15 | May 27–May 27 | 119 | fits: 55 days to maturity, 119 available after May 27. | Jul 16 |
| Arugula | — | Apr 15–Jul 8 | 175 | two-plantings: Plant Apr 15 and again by Aug 14; both mature before Oct 7. | Aug 14 |
| Brussel Sprouts | Apr 15 | May 13–May 27 | 147 | fits: 100 days to maturity, 147 available after May 13. | Jun 15 |
| Butternut Squash | May 27 | Jun 24–Jul 1 | 63 | no-fit: Needs 100 days; Evergreen has 63 after Jun 24. | — |
| Eggplant | Apr 22 | Jun 24–Jul 1 | 56 | head-start: Even planted out Jun 24, the outdoor season is about 14 days short; choose an early variety or grow under cover. | — |
| Okra | May 13 | Jun 17–Jun 24 | 77 | fits: 55 days to maturity, 77 available after Jun 17. | Jun 25 |
| Basil | May 6 | Jul 1–Jul 1 | 63 | fits: 60 days to maturity, 63 available after Jul 1. | — |
| Cilantro | — | May 13–Jun 3 | 133 | two-plantings: Plant May 13 and again by Jul 21; both mature before Sep 23. | Jul 21 |
| Parsley | Apr 1 | Jun 17–Jun 24 | 98 | fits: 70 days to maturity, 98 available after Jun 17. | Jul 1 |
| Celery | Apr 1 | Jun 17–Jul 1 | 98 | no-fit: Needs 120 days; Evergreen has 98 after Jun 17. | — |
| Scallions | Apr 1 | May 13–May 27 | 147 | two-plantings: Plant May 13 and again by Jul 25; both mature before Oct 7. | Jul 25 |
| Turnip | — | May 13–May 27 | 147 | two-plantings: Plant May 13 and again by Aug 4; both mature before Oct 7. | Aug 4 |
| Kohlrabi | — | Apr 29–May 13 | 161 | two-plantings: Plant Apr 29 and again by Jul 30; both mature before Oct 7. | Jul 30 |
| Bok Choy | May 13 | Jun 3–Jun 10 | 112 | two-plantings: Plant Jun 3 and again by Jul 26; both mature before Sep 23. | Jul 26 |
| Collards | Apr 1 | May 13–May 27 | 147 | two-plantings: Plant May 13 and again by Jul 25; both mature before Oct 7. | Jul 25 |
| Cantaloupe | May 27 | Jun 24–Jul 1 | 56 | no-fit: Needs 85 days; Evergreen has 56 after Jun 24. | — |
| Chives | Mar 18 | Jun 17–Jun 24 | 112 | fits: 90 days to maturity, 112 available after Jun 17. | — |
| Dill | — | Apr 15–Jul 8 | 161 | two-plantings: Plant Apr 15 and again by Jul 16; both mature before Sep 23. | Jul 16 |
| Oregano | Apr 1 | Jun 17–Jun 24 | 112 | fits: 80 days to maturity, 112 available after Jun 17. | — |
| Rosemary | Mar 18 | Jun 17–Jun 24 | 98 | fits: 80 days to maturity, 98 available after Jun 17. | — |
| Sage | Apr 15 | Jun 17–Jun 24 | 112 | fits: 75 days to maturity, 112 available after Jun 17. | — |
| Thyme | Apr 1 | Jun 17–Jun 24 | 112 | fits: 90 days to maturity, 112 available after Jun 17. | — |
| Calendula | Apr 29 | May 27–Jun 10 | 119 | two-plantings: Plant May 27 and again by Jul 21; both mature before Sep 23. | Jul 21 |
| Cosmos | May 13 | Jun 10–Jun 24 | 84 | fits: 60 days to maturity, 84 available after Jun 10. | Jun 20 |
| Lavender | Mar 18 | Jun 10–Jun 24 | 119 | fits: 90 days to maturity, 119 available after Jun 10. | — |
| Marigolds | Apr 29 | Jun 10–Jun 17 | 84 | fits: 50 days to maturity, 84 available after Jun 10. | Jun 30 |
| Melons | May 27 | Jun 24–Jul 1 | 56 | no-fit: Needs 85 days; Evergreen has 56 after Jun 24. | — |
| Mint | — | Jun 10–Jun 24 | 119 | fits: 90 days to maturity, 119 available after Jun 10. | — |
| Nasturtiums | May 13 | Jun 10–Jun 17 | 84 | fits: 55 days to maturity, 84 available after Jun 10. | Jun 25 |
| Pole Beans | — | Jun 17–Jul 1 | 77 | fits: 65 days to maturity, 77 available after Jun 17. | — |
| Spaghetti Squash | May 27 | Jun 24–Jul 1 | 63 | no-fit: Needs 90 days; Evergreen has 63 after Jun 24. | — |
| Sunflowers | — | Jun 10–Jun 24 | 84 | fits: 70 days to maturity, 84 available after Jun 10. | — |
| Tomatillos | Apr 15 | Jun 17–Jun 24 | 63 | head-start: Even planted out Jun 17, the outdoor season is about 12 days short; choose an early variety or grow under cover. | — |
| Watermelon | May 27 | Jun 17–Jun 24 | 63 | head-start: Even planted out Jun 17, the outdoor season is about 17 days short; choose an early variety or grow under cover. | — |
| Yellow Squash | May 27 | Jun 24–Jul 1 | 70 | fits: 55 days to maturity, 70 available after Jun 24. | Jun 25 |
| Zinnias | May 13 | Jun 10–Jun 24 | 84 | fits: 60 days to maturity, 84 available after Jun 10. | Jun 20 |
Month by month in Evergreen
| Month | What to do |
|---|---|
| January | Plan your garden layout and order seeds. Research varieties suited to your frost dates. |
| February | Start the slowest-growing crops indoors: onions, leeks, and celery (10–12 weeks before last frost). |
| March | Start indoors: Chives (Mar 18), Lavender (Mar 18), Onion (Mar 18), Rosemary (Mar 18). |
| April | Start indoors: Celery (Apr 1), Collards (Apr 1), Kale (Apr 1), Oregano (Apr 1), Parsley (Apr 1), Scallions (Apr 1), +13 more. Direct sow from: Arugula (Apr 15), Beets (Apr 15), Dill (Apr 15), Peas (Apr 15), Radish (Apr 15), Spinach (Apr 15), +1 more. |
| May | Start indoors: Basil (May 6), Tomato (May 6), Bok Choy (May 13), Corn (May 13), Cosmos (May 13), Nasturtiums (May 13), +11 more. Direct sow from: Cilantro (May 13), Turnip (May 13), Carrots (May 20), Potatoes (May 27). Transplant from: Broccoli (May 13), Brussel Sprouts (May 13), Cabbage (May 13), Collards (May 13), Kale (May 13), Lettuce (May 13), +4 more. Plant: Strawberry (May 6). |
| June | Direct sow from: Sunflowers (Jun 10), Beans (Jun 17), Pole Beans (Jun 17). Transplant from: Bok Choy (Jun 3), Cauliflower (Jun 3), Cosmos (Jun 10), Lavender (Jun 10), Marigolds (Jun 10), Mint (Jun 10), +24 more. Last frost around June 10. Last sowing dates: Brussel Sprouts (Jun 15), Cosmos (Jun 20), Zinnias (Jun 20), Broccoli (Jun 21), Nasturtiums (Jun 25), Okra (Jun 25), +5 more. |
| July | Transplant from: Basil (Jul 1). Last sowing dates: Parsley (Jul 1), Peas (Jul 6), Cabbage (Jul 15), Carrots (Jul 15), Beets (Jul 16), Dill (Jul 16), +9 more. |
| August | Last sowing dates: Turnip (Aug 4), Arugula (Aug 14), Spinach (Aug 14), Radish (Aug 15). |
| September | Direct sow from: Garlic (Sep 16). First frost around September 16. |
| October | Last sowing dates: Garlic (Oct 7). |
| November | Clean up spent plants. Add compost to beds. Rest, review, and plan next year's garden. |
| December | Clean up spent plants. Add compost to beds. Rest, review, and plan next year's garden. |
Frequently Asked Questions
What is the last frost date for Evergreen, CO (ZIP 80439)?
The median last spring frost date for Evergreen, CO (ZIP code 80439) is around June 10. This is the 50th-percentile date — meaning half of all years see frost end before this date. Use the 10% and 90% dates to understand the full range of risk in your area. One year in ten frost ends before May 18; one in ten it runs past July 3.
What is the first fall frost date in Evergreen, CO?
The median first fall frost date for Evergreen, CO is around September 16. Plan to harvest or protect frost-sensitive crops like tomatoes and peppers at least a week before this date to avoid losses. The first frost arrives around September 1 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Evergreen, CO?
The frost-free growing season in Evergreen is about 98 days. This window — from your last spring frost to your first fall frost — is when warm-season vegetables thrive. Cold-hardy crops like kale, spinach, and peas can extend your season by weeks on either side. In Evergreen (98 frost-free days, a short season), 29 of 56 planner crops fit outright, 14 get two plantings, 5 need an indoor start, 7 don't reliably mature, 1 crop is perennial.
What USDA hardiness zone is Evergreen, CO?
Evergreen, CO is in USDA hardiness zone 5b (2023 USDA Plant Hardiness Zone Map). Zones come from the average coldest winter temperature, so they tell you which perennials survive the winter; the frost dates on this page tell you when to plant.
When should I start tomatoes indoors in Evergreen, CO?
Start tomatoes indoors May 6 and plant out Jun 24 in Evergreen. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Evergreen?
Two: plant May 13 and again by Jul 26; both mature before Sep 23.
When do I plant garlic in Evergreen?
Sep 16 to Oct 7; it overwinters and is ready the following summer.
Can I grow Celery in Evergreen?
Not reliably outdoors. Needs 120 days; Evergreen has 98 after Jun 17.
Which nearby ZIP has a longer season?
Morrison (ZIP 80465) has 139 frost-free days, 41 more than Evergreen (ZIP 80439). See Morrison ZIP 80465 frost dates
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