Dinosaur, CO frost dates
Last spring frostMay 2median date
First fall frostOct 14median date
Growing season165 daysfrost-free
Hardiness zone6aZone 6a
How Dinosaur compares
- In 8 years out of 10, the last spring frost in Dinosaur falls between April 18 and May 17, a 29-day window. The first fall frost falls between September 30 and October 26.
- The median last frost is 9 days earlier than the Colorado median of May 11.
- Its 165-day growing season is longer than 92% of the 374 Colorado places with a regular frost season (state median 146 days).
- The last frost is typical for zone 6a, where the median is Apr 29.
- The weather station records an average of 149 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 18 |
| 50% (median) | May 2 |
| 10% (safe for tender plants) | May 17 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 30 |
| 50% (median) | October 14 |
| 90% (late) | October 26 |
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 Dinosaur, CO
Dinosaur, CO frost dates — last frost May 2, first frost Oct 14, zone 6a. whenisthelastfrost.com
Crop
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Start indoors: Feb 7 to Feb 21Transplant outside: Apr 4 to Apr 18
Start indoors: Feb 21 to Mar 7Transplant outside: May 16 to May 30
Start indoors: Feb 21 to Mar 7Transplant outside: May 16 to May 30
Start indoors: Mar 7 to Mar 21Transplant outside: May 9 to May 23
Start indoors: Mar 7 to Mar 21Transplant outside: Apr 11 to Apr 25Sow outdoors: Apr 4 to May 9Plant for fall: Aug 19 to Sep 16
Start indoors: Mar 7 to Mar 21Transplant outside: Apr 4 to Apr 18Sow outdoors: Apr 4 to Apr 18Plant for fall: Aug 5 to Aug 26
Start indoors: Mar 7 to Mar 21Transplant outside: Apr 18 to May 2Plant for fall: Jul 8 to Jul 29
Start indoors: Mar 7 to Mar 21Transplant outside: Apr 11 to Apr 25Plant for fall: Jul 8 to Jul 29
Start indoors: Mar 7 to Mar 21Transplant outside: Apr 18 to May 2Plant for fall: Jul 8 to Jul 29
Start indoors: Mar 21 to Apr 4Transplant outside: May 23 to Jun 6Sow outdoors: May 23 to Jun 6
Start indoors: Mar 21 to Apr 4Transplant outside: May 9 to May 23
Sow outdoors: Mar 21 to Apr 11Plant for fall: Jul 22 to Aug 12
Sow outdoors: Mar 21 to Apr 11Plant for fall: Aug 19 to Sep 9
Sow outdoors: Mar 28 to May 9Plant for fall: Sep 2 to Sep 23
Start indoors: Apr 4 to Apr 11Transplant outside: May 16 to May 23Sow outdoors: May 9 to May 23Plant for fall: Jul 29 to Aug 12
Start indoors: Apr 4 to Apr 11Sow outdoors: May 9 to May 23Plant for fall: Aug 5 to Aug 19
Start indoors: Apr 4 to Apr 11Sow outdoors: May 9 to May 23
Start indoors: Apr 4 to Apr 11Transplant outside: May 16 to May 30
Sow outdoors: Apr 11 to May 9Plant for fall: Jul 22 to Aug 5
Sow outdoors: Apr 11 to May 9Plant for fall: Aug 5 to Aug 19
Sow outdoors: Apr 11 to May 2
Sow outdoors: Apr 18 to May 16Plant for fall: Aug 5 to Aug 19
Sow outdoors: Apr 18 to May 9Plant for fall: Aug 19 to Sep 9
Sow outdoors: May 9 to May 30Plant for fall: Jul 29 to Aug 12
Sow outdoors: May 9 to May 23
Transplant outside: May 16 to Jun 6
Plant for fall: Sep 30 to Nov 4
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Dinosaur, CO
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 7 – Feb 21 | Apr 4 – Apr 18 | — | — |
| Peppers | Feb 21 – Mar 7 | May 16 – May 30 | — | — |
| Eggplant | Feb 21 – Mar 7 | May 16 – May 30 | — | — |
| Tomatoes | Mar 7 – Mar 21 | May 9 – May 23 | — | — |
| Lettuce | Mar 7 – Mar 21 | Apr 11 – Apr 25 | Apr 4 – May 9 | Aug 19 – Sep 16 |
| Kale | Mar 7 – Mar 21 | Apr 4 – Apr 18 | Apr 4 – Apr 18 | Aug 5 – Aug 26 |
| Broccoli | Mar 7 – Mar 21 | Apr 18 – May 2 | — | Jul 8 – Jul 29 |
| Cabbage | Mar 7 – Mar 21 | Apr 11 – Apr 25 | — | Jul 8 – Jul 29 |
| Cauliflower | Mar 7 – Mar 21 | Apr 18 – May 2 | — | Jul 8 – Jul 29 |
| Okra | Mar 21 – Apr 4 | May 23 – Jun 6 | May 23 – Jun 6 | — |
| Basil | Mar 21 – Apr 4 | May 9 – May 23 | — | — |
| Peas | — | — | Mar 21 – Apr 11 | Jul 22 – Aug 12 |
| Spinach | — | — | Mar 21 – Apr 11 | Aug 19 – Sep 9 |
| Radishes | — | — | Mar 28 – May 9 | Sep 2 – Sep 23 |
| Cucumbers | Apr 4 – Apr 11 | May 16 – May 23 | May 9 – May 23 | Jul 29 – Aug 12 |
| Zucchini & Summer Squash | Apr 4 – Apr 11 | — | May 9 – May 23 | Aug 5 – Aug 19 |
| Winter Squash & Pumpkins | Apr 4 – Apr 11 | — | May 9 – May 23 | — |
| Melons & Watermelon | Apr 4 – Apr 11 | May 16 – May 30 | — | — |
| Carrots | — | — | Apr 11 – May 9 | Jul 22 – Aug 5 |
| Beets | — | — | Apr 11 – May 9 | Aug 5 – Aug 19 |
| Potatoes | — | — | Apr 11 – May 2 | — |
| Swiss Chard | — | — | Apr 18 – May 16 | Aug 5 – Aug 19 |
| Cilantro | — | — | Apr 18 – May 9 | Aug 19 – Sep 9 |
| Green Beans | — | — | May 9 – May 30 | Jul 29 – Aug 12 |
| Sweet Corn | — | — | May 9 – May 23 | — |
| Sweet Potatoes | — | May 16 – Jun 6 | — | — |
| Garlic | — | — | — | Sep 30 – Nov 4 |
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 Dinosaur 2 E, CO weather station, about 1 km away (elevation 6,063 ft (1,848 m)).
Frost dates near Dinosaur
- Rangely May 15 · Oct 1
- Dinosaur (Moffat) May 10 · Oct 4
- Maybell Jun 16 · Sep 9
- Meeker Jun 4 · Sep 16
- Mack Apr 27 · Oct 11
- Loma Apr 27 · Oct 11
- Hamilton May 29 · Sep 20
- Parachute May 17 · Sep 30
- Battlement Mesa May 17 · Sep 30
- De Beque May 17 · Sep 30
Frequently asked questions
When is the last frost in Dinosaur, CO?
The median last spring frost in Dinosaur, CO is May 2. There is still about a 10% chance of frost after May 17, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Dinosaur, CO?
The median first fall frost is October 14, with about a 10% chance of frost before September 30.
How long is the growing season in Dinosaur, CO?
About 165 days between the median last spring frost and first fall frost.
What planting zone is Dinosaur, CO?
Dinosaur, CO is in USDA hardiness zone 6a.