Genoa, CO frost dates
Last spring frostMay 8median date
First fall frostOct 10median date
Growing season155 daysfrost-free
Hardiness zone5bZone 5b
How Genoa compares
- In 8 years out of 10, the last spring frost in Genoa falls between April 25 and May 22, a 27-day window. The first fall frost falls between September 28 and October 23.
- The median last frost is 3 days earlier than the Colorado median of May 11.
- Its 155-day growing season is longer than 65% of the 374 Colorado places with a regular frost season (state median 146 days).
- The last frost is 7 days later than the zone 5b median of May 1. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 5b chart.
- The weather station records an average of 148 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 25 |
| 50% (median) | May 8 |
| 10% (safe for tender plants) | May 22 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 28 |
| 50% (median) | October 10 |
| 90% (late) | October 23 |
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 Genoa, CO
Genoa, CO frost dates — last frost May 8, first frost Oct 10, zone 5b. 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 15 to Sep 12
Start indoors: Mar 13 to Mar 27Transplant outside: Apr 10 to Apr 24Sow outdoors: Apr 10 to Apr 24Plant for fall: Aug 1 to Aug 22
Start indoors: Mar 13 to Mar 27Transplant outside: Apr 24 to May 8Plant for fall: Jul 4 to Jul 25
Start indoors: Mar 13 to Mar 27Transplant outside: Apr 17 to May 1Plant for fall: Jul 4 to Jul 25
Start indoors: Mar 13 to Mar 27Transplant outside: Apr 24 to May 8Plant for fall: Jul 4 to Jul 25
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 18 to Aug 8
Sow outdoors: Mar 27 to Apr 17Plant for fall: Aug 15 to Sep 5
Sow outdoors: Apr 3 to May 15Plant for fall: Aug 29 to Sep 19
Start indoors: Apr 10 to Apr 17Transplant outside: May 22 to May 29Sow 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 29Plant for fall: Aug 1 to Aug 15
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 18 to Aug 1
Sow outdoors: Apr 17 to May 15Plant for fall: Aug 1 to Aug 15
Sow outdoors: Apr 17 to May 8
Sow outdoors: Apr 24 to May 22Plant for fall: Aug 1 to Aug 15
Sow outdoors: Apr 24 to May 15Plant for fall: Aug 15 to Sep 5
Sow outdoors: May 15 to Jun 5Plant for fall: Jul 25 to Aug 8
Sow outdoors: May 15 to May 29
Transplant outside: May 22 to Jun 12
Plant for fall: Sep 26 to Oct 31
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Genoa, 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 15 – Sep 12 |
| Kale | Mar 13 – Mar 27 | Apr 10 – Apr 24 | Apr 10 – Apr 24 | Aug 1 – Aug 22 |
| Broccoli | Mar 13 – Mar 27 | Apr 24 – May 8 | — | Jul 4 – Jul 25 |
| Cabbage | Mar 13 – Mar 27 | Apr 17 – May 1 | — | Jul 4 – Jul 25 |
| Cauliflower | Mar 13 – Mar 27 | Apr 24 – May 8 | — | Jul 4 – Jul 25 |
| 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 18 – Aug 8 |
| Spinach | — | — | Mar 27 – Apr 17 | Aug 15 – Sep 5 |
| Radishes | — | — | Apr 3 – May 15 | Aug 29 – Sep 19 |
| Cucumbers | Apr 10 – Apr 17 | May 22 – May 29 | May 15 – May 29 | Jul 25 – Aug 8 |
| Zucchini & Summer Squash | Apr 10 – Apr 17 | — | May 15 – May 29 | Aug 1 – Aug 15 |
| 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 18 – Aug 1 |
| Beets | — | — | Apr 17 – May 15 | Aug 1 – Aug 15 |
| Potatoes | — | — | Apr 17 – May 8 | — |
| Swiss Chard | — | — | Apr 24 – May 22 | Aug 1 – Aug 15 |
| Cilantro | — | — | Apr 24 – May 15 | Aug 15 – Sep 5 |
| Green Beans | — | — | May 15 – Jun 5 | Jul 25 – Aug 8 |
| Sweet Corn | — | — | May 15 – May 29 | — |
| Sweet Potatoes | — | May 22 – Jun 12 | — | — |
| Garlic | — | — | — | Sep 26 – Oct 31 |
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 Genoa, CO weather station, 7 km away (elevation 5,594 ft (1,705 m)).
Frost dates near Genoa
- Arriba May 5 · Oct 8
- Limon May 21 · Sep 26
- Hugo May 10 · Oct 2
- Flagler May 5 · Oct 8
- Usaf Academy May 12 · Oct 2
- Matheson May 12 · Oct 2
- Agate May 12 · Oct 2
- Anton May 12 · Oct 4
- Seibert May 4 · Oct 11
- Lindon May 15 · Oct 2
Frequently asked questions
When is the last frost in Genoa, CO?
The median last spring frost in Genoa, 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 Genoa, CO?
The median first fall frost is October 10, with about a 10% chance of frost before September 28.
How long is the growing season in Genoa, CO?
About 155 days between the median last spring frost and first fall frost.
What planting zone is Genoa, CO?
Genoa, CO is in USDA hardiness zone 5b.