Frost dates for Rye, CO
When the last spring frost and first fall frost usually come, and when to plant, from 30 years of NOAA weather records.
Last spring frost
May 5
typical year
Safe to plant
May 20
frost is over in 9 of 10 years
First fall frost
October 10
typical year
Growing season
156 days
frost-free, typical year
Frost watch this week
Tonight's and the next six nights' lows from the National Weather Service forecast for the station's location. Frost: 32°F or colder. Possible frost: 33–36°F, mostly in low spots on clear, still nights.
When to plant
Counted from this page's frost dates. Warm-season crops wait for the safe-to-plant date.
| Crop | Start indoors | Plant outside | Fall planting |
|---|---|---|---|
| Cool-season crops | |||
| Peas | – | Apr 7 – 21 | – |
| Spinach | – | Mar 24 – Apr 14 | Aug 15 – 29 |
| Lettuce | – | Apr 7 – 28 | Aug 15 – 29 |
| Radishes | – | Apr 7 – May 19 | Aug 29 – Sep 12 |
| Onions | – | Apr 7 – 21 | – |
| Potatoes | – | Apr 14 – 28 | – |
| Carrots | – | Apr 14 – May 5 | Jul 18 – Aug 1 |
| Beets | – | Apr 7 – 21 | Aug 1 – 15 |
| Kale | Feb 24 – Mar 10 | Apr 7 – 21 | Aug 1 – 15 |
| Broccoli | Feb 24 – Mar 10 | Apr 21 – May 5 | Aug 1 – 15 |
| Cabbage | Feb 10 – 24 | Apr 7 – 21 | Aug 1 – 15 |
| Garlic | – | – | Aug 29 – Sep 19 |
| Warm-season crops | |||
| Tomatoes | Mar 25 – Apr 8 | May 20 – Jun 3 | – |
| Peppers | Mar 18 – Apr 1 | May 27 – Jun 10 | – |
| Cucumbers | – | May 20 – Jun 10 | – |
| Zucchini | – | May 20 – Jun 17 | – |
| Pumpkins | – | May 20 – Jun 10 | – |
| Green beans | – | May 20 – Aug 1 | – |
| Sweet corn | – | May 20 – Jun 17 | – |
| Basil | Apr 15 – 29 | May 27 – Jun 3 | – |
Onions: from sets. Green beans: until 10 weeks before the first fall frost. Garlic: harvest next summer.
The year at a glance
Start indoors Plant outside Fall planting
The chance of frost, by date
| 1 year in 10 | Half of years | 9 years in 10 | |
|---|---|---|---|
| Spring frost after | May 20 | May 5 | April 22 |
| Fall frost before | September 27 | October 10 | October 23 |
Frost here means 32°F or colder. Read across: in 1 year in 10, spring frost carries on past the first date, which is why that date is the safe-to-plant date.
Hard freeze (28°F)
A hard freeze kills most garden plants, even hardy ones. The last one in spring usually comes around April 26 (May 10 in a late year), and the first one in fall around October 19.
Towns that use these dates
This is the nearest NOAA station with frost records for 1 town.
Rye
Where these dates come from
NOAA weather station RYE 1SW, CO US (USC00057317), 1991–2020 climate normals. It's the nearest station for 4 zip codes, all within 19 miles:
81019, 81023, 81069, 81253
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.