Englewood, CO planting zone & frost dates
Englewood is in USDA hardiness zone 6a. The last spring frost usually comes around May 2 and the first fall frost around October 11, for a growing season of about 160 days.
Planting calendar for Englewood
Dates are counted from the average last spring frost (May 2) using the typical timing recommended by U.S. extension services. Warm-season crops go out only after the danger of frost has passed and the soil has warmed.
| Crop | When |
|---|---|
| Tomatoes | Start seeds indoors: Mar 7 – Mar 21 Transplant outdoors: May 9 – May 16 |
| Peppers | Start seeds indoors: Feb 21 – Mar 7 Transplant outdoors: May 16 – May 23 |
| Eggplant | Start seeds indoors: Feb 21 – Mar 7 Transplant outdoors: May 16 – May 23 |
| Broccoli | Start seeds indoors: Feb 21 – Mar 7 Transplant outdoors: Apr 4 – Apr 18 |
| Cabbage | Start seeds indoors: Feb 21 – Mar 7 Transplant outdoors: Apr 4 – Apr 18 |
| Onions (sets) | Plant outdoors: Apr 4 – Apr 18 |
| Peas | Sow outdoors: Mar 21 – Apr 4 |
| Spinach | Sow outdoors: Mar 21 – Apr 4 |
| Lettuce | Sow outdoors: Apr 4 – Apr 18 |
| Carrots | Sow outdoors: Apr 4 – Apr 18 |
| Potatoes | Plant outdoors: Apr 4 – Apr 18 |
| Beans | Sow outdoors: May 9 – May 16 |
| Sweet corn | Sow outdoors: May 9 – May 16 |
| Cucumbers | Sow outdoors: May 9 – May 16 |
| Squash & zucchini | Sow outdoors: May 9 – May 16 |
| Basil | Start seeds indoors: Mar 21 – Apr 4 Transplant outdoors: May 9 – May 16 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Aug 16 (8 weeks before the average first fall frost on Oct 11).
Useful for zone 6a gardens
- Seed starting kit with dome — to start seeds indoors before the last frost
- LED grow light for seedlings — stops leggy seedlings
- Frost cloth / plant covers — for late spring and early fall frosts
- Soil thermometer — warm-season crops need soil above 60°F
- Cold frame / mini greenhouse — adds weeks to a short season
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Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Apr 20 | May 2 | May 17 |
| First 32°F frost in fall is before | Oct 23 | Oct 11 | Sep 27 |
How to read it: in spring there is a 10% chance of a frost after May 17, so that is a safe date for tender plants. In fall there is a 10% chance of frost before September 27. A hard freeze (28°F) usually ends around April 23.
Hardiness zone by ZIP code in Englewood
- 80110 zone 6a
- 80111 zone 6a
- 80112 zone 6a
- 80113 zone 6a
- 80150 zone 6a
- 80151 zone 6a
- 80155 zone 6a
Nearby cities
- Littleton zone 6a, last frost May 2
- Greenwood Village zone 6a, last frost May 2
- Denver zone 6a, last frost Apr 30
- Highlands Ranch zone 6a, last frost May 5
- Columbine zone 6a, last frost May 2
- Lakewood zone 6a, last frost May 3
- Centennial zone 6a, last frost May 5
- Cherry Creek zone 6a, last frost May 7
Questions
What growing zone is Englewood, CO?
Englewood is in USDA Plant Hardiness Zone 6a (average extreme winter low -10°F to -5°F), according to the USDA 2023 map.
When is the last frost in Englewood?
The average last spring frost (32°F) in Englewood is May 2. There is still a 10% chance of frost until May 17.
When can I plant tomatoes in Englewood?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around May 9 – May 16. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Marston Fltr Plt, CO (USC00055402), 7.3 km (4.5 mi) from the city center, elevation 1710 m, based on 18 years of records. Hardiness zone: USDA Plant Hardiness Zone Map 2023 for the ZIP code nearest to the city center. Microclimates (valleys, hills, cities, coasts) can be warmer or colder: check the local forecast before planting. How we calculate the data.