Frost dates for 80419 — Golden, CO
Last spring frostMay 8median date
First fall frostOct 3median date
Growing season148 daysfrost-free
Hardiness zone6aZone 6a
How Golden compares
- In 8 years out of 10, the last spring frost in Golden falls between April 27 and May 22, a 25-day window. The first fall frost falls between September 21 and October 17.
- The median last frost is 3 days earlier than the Colorado median of May 11.
- Its 148-day growing season is longer than 53% of the 374 Colorado places with a regular frost season (state median 146 days).
- The last frost is 9 days later than the zone 6a median of Apr 29. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 6a chart.
- The weather station records an average of 156 nights a year at or below 32°F.
- Compared with Denver, CO, 32 km away, the last frost here is 8 days later than there and the growing season is 17 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 27 |
| 50% (median) | May 8 |
| 10% (safe for tender plants) | May 22 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 21 |
| 50% (median) | October 3 |
| 90% (late) | October 17 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for Golden, CO
Frost dates for 80419 — Golden, CO — last frost May 8, first frost Oct 3, zone 6a. whenisthelastfrost.com
Crop
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Start indoors: Feb 13 to Feb 27Transplant outside: Apr 10 to Apr 24
Start indoors: Feb 27 to Mar 13Transplant outside: May 22 to Jun 5
Start indoors: Feb 27 to Mar 13Transplant outside: May 22 to Jun 5
Start indoors: Mar 13 to Mar 27Transplant outside: May 15 to May 29
Start indoors: Mar 13 to Mar 27Transplant outside: Apr 17 to May 1Sow outdoors: Apr 10 to May 15Plant for fall: Aug 8 to Sep 5
Start indoors: Mar 13 to Mar 27Transplant outside: Apr 10 to Apr 24Sow outdoors: Apr 10 to Apr 24Plant for fall: Jul 25 to Aug 15
Start indoors: Mar 13 to Mar 27Transplant outside: Apr 24 to May 8Plant for fall: Jun 27 to Jul 18
Start indoors: Mar 13 to Mar 27Transplant outside: Apr 17 to May 1Plant for fall: Jun 27 to Jul 18
Start indoors: Mar 13 to Mar 27Transplant outside: Apr 24 to May 8Plant for fall: Jun 27 to Jul 18
Start indoors: Mar 27 to Apr 10Transplant outside: May 29 to Jun 12Sow outdoors: May 29 to Jun 12
Start indoors: Mar 27 to Apr 10Transplant outside: May 15 to May 29
Sow outdoors: Mar 27 to Apr 17Plant for fall: Jul 11 to Aug 1
Sow outdoors: Mar 27 to Apr 17Plant for fall: Aug 8 to Aug 29
Sow outdoors: Apr 3 to May 15Plant for fall: Aug 22 to Sep 12
Start indoors: Apr 10 to Apr 17Transplant outside: May 22 to May 29Sow outdoors: May 15 to May 29Plant for fall: Jul 18 to Aug 1
Start indoors: Apr 10 to Apr 17Sow outdoors: May 15 to May 29Plant for fall: Jul 25 to Aug 8
Start indoors: Apr 10 to Apr 17Sow outdoors: May 15 to May 29
Start indoors: Apr 10 to Apr 17Transplant outside: May 22 to Jun 5
Sow outdoors: Apr 17 to May 15Plant for fall: Jul 11 to Jul 25
Sow outdoors: Apr 17 to May 15Plant for fall: Jul 25 to Aug 8
Sow outdoors: Apr 17 to May 8
Sow outdoors: Apr 24 to May 22Plant for fall: Jul 25 to Aug 8
Sow outdoors: Apr 24 to May 15Plant for fall: Aug 8 to Aug 29
Sow outdoors: May 15 to Jun 5Plant for fall: Jul 18 to Aug 1
Sow outdoors: May 15 to May 29
Transplant outside: May 22 to Jun 12
Plant for fall: Sep 19 to Oct 24
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Golden, CO
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 13 – Feb 27 | Apr 10 – Apr 24 | — | — |
| Peppers | Feb 27 – Mar 13 | May 22 – Jun 5 | — | — |
| Eggplant | Feb 27 – Mar 13 | May 22 – Jun 5 | — | — |
| Tomatoes | Mar 13 – Mar 27 | May 15 – May 29 | — | — |
| Lettuce | Mar 13 – Mar 27 | Apr 17 – May 1 | Apr 10 – May 15 | Aug 8 – Sep 5 |
| Kale | Mar 13 – Mar 27 | Apr 10 – Apr 24 | Apr 10 – Apr 24 | Jul 25 – Aug 15 |
| Broccoli | Mar 13 – Mar 27 | Apr 24 – May 8 | — | Jun 27 – Jul 18 |
| Cabbage | Mar 13 – Mar 27 | Apr 17 – May 1 | — | Jun 27 – Jul 18 |
| Cauliflower | Mar 13 – Mar 27 | Apr 24 – May 8 | — | Jun 27 – Jul 18 |
| Okra | Mar 27 – Apr 10 | May 29 – Jun 12 | May 29 – Jun 12 | — |
| Basil | Mar 27 – Apr 10 | May 15 – May 29 | — | — |
| Peas | — | — | Mar 27 – Apr 17 | Jul 11 – Aug 1 |
| Spinach | — | — | Mar 27 – Apr 17 | Aug 8 – Aug 29 |
| Radishes | — | — | Apr 3 – May 15 | Aug 22 – Sep 12 |
| Cucumbers | Apr 10 – Apr 17 | May 22 – May 29 | May 15 – May 29 | Jul 18 – Aug 1 |
| Zucchini & Summer Squash | Apr 10 – Apr 17 | — | May 15 – May 29 | Jul 25 – Aug 8 |
| Winter Squash & Pumpkins | Apr 10 – Apr 17 | — | May 15 – May 29 | — |
| Melons & Watermelon | Apr 10 – Apr 17 | May 22 – Jun 5 | — | — |
| Carrots | — | — | Apr 17 – May 15 | Jul 11 – Jul 25 |
| Beets | — | — | Apr 17 – May 15 | Jul 25 – Aug 8 |
| Potatoes | — | — | Apr 17 – May 8 | — |
| Swiss Chard | — | — | Apr 24 – May 22 | Jul 25 – Aug 8 |
| Cilantro | — | — | Apr 24 – May 15 | Aug 8 – Aug 29 |
| Green Beans | — | — | May 15 – Jun 5 | Jul 18 – Aug 1 |
| Sweet Corn | — | — | May 15 – May 29 | — |
| Sweet Potatoes | — | May 22 – Jun 12 | — | — |
| Garlic | — | — | — | Sep 19 – Oct 24 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Kassler, CO weather station, 12 km away (elevation 5,587 ft (1,703 m)).
ZIP codes in Golden: 80401 80402 80403 80419
Frost dates near Golden
- Conifer May 23 · Sep 22
- Evergreen May 23 · Sep 22
- Morrison May 2 · Oct 11
- Indian Hills May 23 · Sep 22
- Pine Jun 16 · Sep 8
- Kittredge May 23 · Sep 22
- Buffalo Creek May 16 · Sep 29
- Idledale May 23 · Sep 22
Frequently asked questions
When is the last frost in Golden, CO?
The median last spring frost in Golden, CO is May 8. There is still about a 10% chance of frost after May 22, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Golden, CO?
The median first fall frost is October 3, with about a 10% chance of frost before September 21.
How long is the growing season in Golden, CO?
About 148 days between the median last spring frost and first fall frost.
What planting zone is Golden, CO?
Golden, CO is in USDA hardiness zone 6a.