Nathrop, CO frost dates
Last spring frostMay 27median date
First fall frostSep 23median date
Growing season119 daysfrost-free
Hardiness zone5bZone 5b
How Nathrop compares
- In 8 years out of 10, the last spring frost in Nathrop falls between May 13 and June 11, a 29-day window. The first fall frost falls between September 10 and October 4.
- The median last frost is 16 days later than the Colorado median of May 11.
- Its 119-day growing season is longer than 28% of the 374 Colorado places with a regular frost season (state median 146 days).
- The last frost is 26 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 208 nights a year at or below 32°F.
- Compared with Colorado Springs, CO, 118 km away, the last frost here is 24 days later than there and the growing season is 39 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 13 |
| 50% (median) | May 27 |
| 10% (safe for tender plants) | June 11 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 10 |
| 50% (median) | September 23 |
| 90% (late) | October 4 |
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 Nathrop, CO
Nathrop, CO frost dates — last frost May 27, first frost Sep 23, zone 5b. whenisthelastfrost.com
Crop
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Start indoors: Mar 4 to Mar 18Transplant outside: Apr 29 to May 13
Start indoors: Mar 18 to Apr 1Transplant outside: Jun 10 to Jun 24
Start indoors: Mar 18 to Apr 1Transplant outside: Jun 10 to Jun 24
Start indoors: Apr 1 to Apr 15Transplant outside: Jun 3 to Jun 17
Start indoors: Apr 1 to Apr 15Transplant outside: May 6 to May 20Sow outdoors: Apr 29 to Jun 3Plant for fall: Jul 29 to Aug 26
Start indoors: Apr 1 to Apr 15Transplant outside: Apr 29 to May 13Sow outdoors: Apr 29 to May 13Plant for fall: Jul 15 to Aug 5
Start indoors: Apr 1 to Apr 15Transplant outside: May 13 to May 27Plant for fall: Jun 17 to Jul 8
Start indoors: Apr 1 to Apr 15Transplant outside: May 6 to May 20Plant for fall: Jun 17 to Jul 8
Start indoors: Apr 1 to Apr 15Transplant outside: May 13 to May 27Plant for fall: Jun 17 to Jul 8
Start indoors: Apr 15 to Apr 29Transplant outside: Jun 17 to Jul 1Sow outdoors: Jun 17 to Jul 1
Start indoors: Apr 15 to Apr 29Transplant outside: Jun 3 to Jun 17
Sow outdoors: Apr 15 to May 6Plant for fall: Jul 1 to Jul 22
Sow outdoors: Apr 15 to May 6Plant for fall: Jul 29 to Aug 19
Sow outdoors: Apr 22 to Jun 3Plant for fall: Aug 12 to Sep 2
Start indoors: Apr 29 to May 6Transplant outside: Jun 10 to Jun 17Sow outdoors: Jun 3 to Jun 17Plant for fall: Jul 8 to Jul 22
Start indoors: Apr 29 to May 6Sow outdoors: Jun 3 to Jun 17Plant for fall: Jul 15 to Jul 29
Start indoors: Apr 29 to May 6Sow outdoors: Jun 3 to Jun 17
Start indoors: Apr 29 to May 6Transplant outside: Jun 10 to Jun 24
Sow outdoors: May 6 to Jun 3Plant for fall: Jul 1 to Jul 15
Sow outdoors: May 6 to Jun 3Plant for fall: Jul 15 to Jul 29
Sow outdoors: May 6 to May 27
Sow outdoors: May 13 to Jun 10Plant for fall: Jul 15 to Jul 29
Sow outdoors: May 13 to Jun 3Plant for fall: Jul 29 to Aug 19
Sow outdoors: Jun 3 to Jun 24
Sow outdoors: Jun 3 to Jun 17
Transplant outside: Jun 10 to Jul 1
Plant for fall: Sep 9 to Oct 14
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Nathrop, CO
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 4 – Mar 18 | Apr 29 – May 13 | — | — |
| Peppers | Mar 18 – Apr 1 | Jun 10 – Jun 24 | — | — |
| Eggplant | Mar 18 – Apr 1 | Jun 10 – Jun 24 | — | — |
| Tomatoes | Apr 1 – Apr 15 | Jun 3 – Jun 17 | — | — |
| Lettuce | Apr 1 – Apr 15 | May 6 – May 20 | Apr 29 – Jun 3 | Jul 29 – Aug 26 |
| Kale | Apr 1 – Apr 15 | Apr 29 – May 13 | Apr 29 – May 13 | Jul 15 – Aug 5 |
| Broccoli | Apr 1 – Apr 15 | May 13 – May 27 | — | Jun 17 – Jul 8 |
| Cabbage | Apr 1 – Apr 15 | May 6 – May 20 | — | Jun 17 – Jul 8 |
| Cauliflower | Apr 1 – Apr 15 | May 13 – May 27 | — | Jun 17 – Jul 8 |
| Okra | Apr 15 – Apr 29 | Jun 17 – Jul 1 | Jun 17 – Jul 1 | — |
| Basil | Apr 15 – Apr 29 | Jun 3 – Jun 17 | — | — |
| Peas | — | — | Apr 15 – May 6 | Jul 1 – Jul 22 |
| Spinach | — | — | Apr 15 – May 6 | Jul 29 – Aug 19 |
| Radishes | — | — | Apr 22 – Jun 3 | Aug 12 – Sep 2 |
| Cucumbers | Apr 29 – May 6 | Jun 10 – Jun 17 | Jun 3 – Jun 17 | Jul 8 – Jul 22 |
| Zucchini & Summer Squash | Apr 29 – May 6 | — | Jun 3 – Jun 17 | Jul 15 – Jul 29 |
| Winter Squash & Pumpkins | Apr 29 – May 6 | — | Jun 3 – Jun 17 | — |
| Melons & Watermelon | Apr 29 – May 6 | Jun 10 – Jun 24 | — | — |
| Carrots | — | — | May 6 – Jun 3 | Jul 1 – Jul 15 |
| Beets | — | — | May 6 – Jun 3 | Jul 15 – Jul 29 |
| Potatoes | — | — | May 6 – May 27 | — |
| Swiss Chard | — | — | May 13 – Jun 10 | Jul 15 – Jul 29 |
| Cilantro | — | — | May 13 – Jun 3 | Jul 29 – Aug 19 |
| Green Beans | — | — | Jun 3 – Jun 24 | — |
| Sweet Corn | — | — | Jun 3 – Jun 17 | — |
| Sweet Potatoes | — | Jun 10 – Jul 1 | — | — |
| Garlic | — | — | — | Sep 9 – Oct 14 |
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 Buena Vista 2s, CO weather station, 13 km away (elevation 7,953 ft (2,424 m)).
Frost dates near Nathrop
- Buena Vista May 27 · Sep 23
- Poncha Springs May 29 · Sep 20
- Salida May 29 · Sep 20
- Monarch frost any month
- Hartsel frost any month
- Pitkin Jun 20 · Sep 8
- Granite Jun 16 · Sep 10
- Sargents frost any month
- Ohio City Jun 21 · Sep 5
- Howard May 29 · Sep 20
Frequently asked questions
When is the last frost in Nathrop, CO?
The median last spring frost in Nathrop, CO is May 27. There is still about a 10% chance of frost after June 11, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Nathrop, CO?
The median first fall frost is September 23, with about a 10% chance of frost before September 10.
How long is the growing season in Nathrop, CO?
About 119 days between the median last spring frost and first fall frost.
What planting zone is Nathrop, CO?
Nathrop, CO is in USDA hardiness zone 5b.