Bellvue, CO frost dates
Last spring frostMay 21median date
First fall frostSep 29median date
Growing season131 daysfrost-free
Hardiness zone5bZone 5b
How Bellvue compares
- In 8 years out of 10, the last spring frost in Bellvue falls between May 9 and June 4, a 26-day window. The first fall frost falls between September 12 and October 12.
- The median last frost is 10 days later than the Colorado median of May 11.
- Its 131-day growing season is longer than 35% of the 374 Colorado places with a regular frost season (state median 146 days).
- The last frost is 20 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 164 nights a year at or below 32°F.
- Compared with Fort Collins, CO, 17 km away, the last frost here is 19 days later than there and the growing season is 27 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 9 |
| 50% (median) | May 21 |
| 10% (safe for tender plants) | June 4 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 12 |
| 50% (median) | September 29 |
| 90% (late) | October 12 |
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 Bellvue, CO
Bellvue, CO frost dates — last frost May 21, first frost Sep 29, zone 5b. whenisthelastfrost.com
Crop
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Start indoors: Feb 26 to Mar 12Transplant outside: Apr 23 to May 7
Start indoors: Mar 12 to Mar 26Transplant outside: Jun 4 to Jun 18
Start indoors: Mar 12 to Mar 26Transplant outside: Jun 4 to Jun 18
Start indoors: Mar 26 to Apr 9Transplant outside: May 28 to Jun 11
Start indoors: Mar 26 to Apr 9Transplant outside: Apr 30 to May 14Sow outdoors: Apr 23 to May 28Plant for fall: Aug 4 to Sep 1
Start indoors: Mar 26 to Apr 9Transplant outside: Apr 23 to May 7Sow outdoors: Apr 23 to May 7Plant for fall: Jul 21 to Aug 11
Start indoors: Mar 26 to Apr 9Transplant outside: May 7 to May 21Plant for fall: Jun 23 to Jul 14
Start indoors: Mar 26 to Apr 9Transplant outside: Apr 30 to May 14Plant for fall: Jun 23 to Jul 14
Start indoors: Mar 26 to Apr 9Transplant outside: May 7 to May 21Plant for fall: Jun 23 to Jul 14
Start indoors: Apr 9 to Apr 23Transplant outside: Jun 11 to Jun 25Sow outdoors: Jun 11 to Jun 25
Start indoors: Apr 9 to Apr 23Transplant outside: May 28 to Jun 11
Sow outdoors: Apr 9 to Apr 30Plant for fall: Jul 7 to Jul 28
Sow outdoors: Apr 9 to Apr 30Plant for fall: Aug 4 to Aug 25
Sow outdoors: Apr 16 to May 28Plant for fall: Aug 18 to Sep 8
Start indoors: Apr 23 to Apr 30Transplant outside: Jun 4 to Jun 11Sow outdoors: May 28 to Jun 11Plant for fall: Jul 14 to Jul 28
Start indoors: Apr 23 to Apr 30Sow outdoors: May 28 to Jun 11Plant for fall: Jul 21 to Aug 4
Start indoors: Apr 23 to Apr 30Sow outdoors: May 28 to Jun 11
Start indoors: Apr 23 to Apr 30Transplant outside: Jun 4 to Jun 18
Sow outdoors: Apr 30 to May 28Plant for fall: Jul 7 to Jul 21
Sow outdoors: Apr 30 to May 28Plant for fall: Jul 21 to Aug 4
Sow outdoors: Apr 30 to May 21
Sow outdoors: May 7 to Jun 4Plant for fall: Jul 21 to Aug 4
Sow outdoors: May 7 to May 28Plant for fall: Aug 4 to Aug 25
Sow outdoors: May 28 to Jun 18Plant for fall: Jul 14 to Jul 28
Sow outdoors: May 28 to Jun 11
Transplant outside: Jun 4 to Jun 25
Plant for fall: Sep 15 to Oct 20
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Bellvue, CO
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 26 – Mar 12 | Apr 23 – May 7 | — | — |
| Peppers | Mar 12 – Mar 26 | Jun 4 – Jun 18 | — | — |
| Eggplant | Mar 12 – Mar 26 | Jun 4 – Jun 18 | — | — |
| Tomatoes | Mar 26 – Apr 9 | May 28 – Jun 11 | — | — |
| Lettuce | Mar 26 – Apr 9 | Apr 30 – May 14 | Apr 23 – May 28 | Aug 4 – Sep 1 |
| Kale | Mar 26 – Apr 9 | Apr 23 – May 7 | Apr 23 – May 7 | Jul 21 – Aug 11 |
| Broccoli | Mar 26 – Apr 9 | May 7 – May 21 | — | Jun 23 – Jul 14 |
| Cabbage | Mar 26 – Apr 9 | Apr 30 – May 14 | — | Jun 23 – Jul 14 |
| Cauliflower | Mar 26 – Apr 9 | May 7 – May 21 | — | Jun 23 – Jul 14 |
| Okra | Apr 9 – Apr 23 | Jun 11 – Jun 25 | Jun 11 – Jun 25 | — |
| Basil | Apr 9 – Apr 23 | May 28 – Jun 11 | — | — |
| Peas | — | — | Apr 9 – Apr 30 | Jul 7 – Jul 28 |
| Spinach | — | — | Apr 9 – Apr 30 | Aug 4 – Aug 25 |
| Radishes | — | — | Apr 16 – May 28 | Aug 18 – Sep 8 |
| Cucumbers | Apr 23 – Apr 30 | Jun 4 – Jun 11 | May 28 – Jun 11 | Jul 14 – Jul 28 |
| Zucchini & Summer Squash | Apr 23 – Apr 30 | — | May 28 – Jun 11 | Jul 21 – Aug 4 |
| Winter Squash & Pumpkins | Apr 23 – Apr 30 | — | May 28 – Jun 11 | — |
| Melons & Watermelon | Apr 23 – Apr 30 | Jun 4 – Jun 18 | — | — |
| Carrots | — | — | Apr 30 – May 28 | Jul 7 – Jul 21 |
| Beets | — | — | Apr 30 – May 28 | Jul 21 – Aug 4 |
| Potatoes | — | — | Apr 30 – May 21 | — |
| Swiss Chard | — | — | May 7 – Jun 4 | Jul 21 – Aug 4 |
| Cilantro | — | — | May 7 – May 28 | Aug 4 – Aug 25 |
| Green Beans | — | — | May 28 – Jun 18 | Jul 14 – Jul 28 |
| Sweet Corn | — | — | May 28 – Jun 11 | — |
| Sweet Potatoes | — | Jun 4 – Jun 25 | — | — |
| Garlic | — | — | — | Sep 15 – Oct 20 |
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 Buckhorn Mtn 1 E, CO weather station, 3 km away (elevation 7,402 ft (2,256 m)).
Frost dates near Bellvue
- Laporte May 2 · Oct 7
- Masonville May 12 · Oct 1
- Fort Collins May 2 · Oct 7
- Wellington May 3 · Oct 6
- Drake May 30 · Sep 17
- Glen Haven May 30 · Sep 17
- Timnath May 3 · Oct 6
- Estes Park frost any month
- Livermore May 31 · Sep 19
- Loveland May 10 · Oct 1
Frequently asked questions
When is the last frost in Bellvue, CO?
The median last spring frost in Bellvue, CO is May 21. There is still about a 10% chance of frost after June 4, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Bellvue, CO?
The median first fall frost is September 29, with about a 10% chance of frost before September 12.
How long is the growing season in Bellvue, CO?
About 131 days between the median last spring frost and first fall frost.
What planting zone is Bellvue, CO?
Bellvue, CO is in USDA hardiness zone 5b.