Frost dates for Waverly, 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
June 6
typical year
Safe to plant
June 22
frost is over in 9 of 10 years
First fall frost
September 15
typical year
Growing season
100 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 | – | May 9 – 23 | – |
| Spinach | – | Apr 25 – May 16 | Jul 21 – Aug 4 |
| Lettuce | – | May 9 – 30 | Jul 21 – Aug 4 |
| Radishes | – | May 9 – Jun 20 | Aug 4 – 18 |
| Onions | – | May 9 – 23 | – |
| Potatoes | Season usually too short. Try a quick variety or row covers. | ||
| Carrots | – | May 16 – Jun 6 | Jun 23 – Jul 7 |
| Beets | – | May 9 – 23 | Jul 7 – 21 |
| Kale | Mar 28 – Apr 11 | May 9 – 23 | Jul 7 – 21 |
| Broccoli | Mar 28 – Apr 11 | May 23 – Jun 6 | Jul 7 – 21 |
| Cabbage | Mar 14 – 28 | May 9 – 23 | Jul 7 – 21 |
| Garlic | – | – | Aug 4 – 25 |
| Warm-season crops | |||
| Tomatoes | Apr 27 – May 11 | Jun 22 – Jul 6 | – |
| Peppers | Apr 20 – May 4 | Jun 29 – Jul 13 | – |
| Cucumbers | – | Jun 22 – Jul 13 | – |
| Zucchini | – | Jun 22 – Jul 20 | – |
| Pumpkins | Season usually too short. Try a quick variety or row covers. | ||
| Green beans | – | Jun 22 – Jul 7 | – |
| Sweet corn | – | Jun 22 – Jul 20 | – |
| Basil | May 18 – Jun 1 | Jun 29 – Jul 6 | – |
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 | June 22 | June 6 | May 24 |
| Fall frost before | September 3 | September 15 | September 26 |
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 May 24 (June 6 in a late year), and the first one in fall around September 25.
Where these dates come from
NOAA weather station WAVERLY 1W, CO US (USC00058860), 1991–2020 climate normals. It's the nearest station for 2 zip codes, all within 11 miles:
81124, 81140
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.