Frost dates for 80734Holyoke, CO
The average last spring frost in Holyoke is May 11 and the average first fall frost is October 3, giving a typical growing season of about 144 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 11
- Average first fall frost
- Oct 3
- Growing season
- 144 days
Safer after May 23 (1-in-10 risk)
Possible by Sep 20 (1-in-10 risk)
Last frost typically in 196 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | May 9 · May 20 · Jun 2 | Sep 13 · Sep 25 · Oct 5 | 126 days | 100% |
| Frost / freeze (32°F) | Apr 30 · May 11 · May 23 | Sep 20 · Oct 3 · Oct 13 | 144 days | 100% |
| Hard freeze (28°F) | Apr 17 · May 1 · May 14 | Sep 29 · Oct 12 · Oct 21 | 162 days | 100% |
Planting calendar for Holyoke
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Apr 10 – Jun 16 |
| Tomatoes | Transplant outdoors | May 27 – Jun 13 |
| Peppers | Start seeds indoors | Apr 10 – May 11 |
| Peppers | Transplant outdoors | Jun 10 – Jul 11 |
| Eggplant | Start seeds indoors | Apr 27 – May 26 |
| Eggplant | Transplant outdoors | Jun 10 – Jul 11 |
| Cucumbers | Sow outdoors | Jun 10 – Jun 23 |
| Summer squash | Sow outdoors | May 27 – Jul 11 |
| Winter squash & pumpkins | Sow outdoors | Jun 10 – Jul 11 |
| Snap beans | Sow outdoors | May 27 – Jul 16 |
| Sweet corn | Sow outdoors | May 27 – Jun 13 |
| Watermelon & cantaloupe | Sow outdoors | Jun 10 – Jul 11 |
| Okra | Sow outdoors | Jun 3 – Jun 26 |
| Peas | Sow outdoors (spring) | Apr 10 – May 26 |
| Potatoes | Plant outdoors (spring) | Apr 10 – Jun 10 |
| Onions | Start seeds indoors (spring) | Feb 27 – Mar 26 |
| Onions | Transplant outdoors (spring) | Apr 27 – May 26 |
| Broccoli | Start seeds indoors (spring) | Mar 23 – Apr 26 |
| Broccoli | Transplant outdoors (spring) | Apr 27 – May 26 |
| Broccoli | Start seeds indoors (fall) | Jun 3 – Jun 13 |
| Broccoli | Transplant outdoors (fall) | Jul 3 – Jul 14 |
| Cabbage | Start seeds indoors (spring) | Mar 13 – Apr 10 |
| Cabbage | Transplant outdoors (spring) | Apr 10 – May 11 |
| Cabbage | Start seeds indoors (fall) | May 24 – Jun 23 |
| Cabbage | Transplant outdoors (fall) | Jun 23 – Jul 24 |
| Leaf lettuce | Sow outdoors (spring) | Apr 10 – Jun 26 |
| Leaf lettuce | Sow outdoors (fall) | Jun 23 – Aug 9 |
| Spinach | Sow outdoors (spring) | Apr 3 – May 17 |
| Spinach | Sow outdoors (fall) | Jul 10 – Aug 14 |
| Radishes | Sow outdoors (spring) | Apr 10 – May 31 |
| Radishes | Sow outdoors (fall) | Jun 23 – Aug 24 |
| Kale | Sow outdoors (spring) | Apr 27 – May 17 |
| Kale | Sow outdoors (fall) | Jun 16 – Jul 24 |
| Carrots | Sow outdoors (spring) | May 11 – Jun 26 |
| Carrots | Sow outdoors (fall) | May 24 – Jul 9 |
| Garlic | Plant outdoors (fall) | Sep 23 – Oct 24 |
Where these dates come from
ZIP code 80734 is matched to the NOAA station Holyoke, CO, 6.5 km away, at 3,780 ft elevation (56 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Holyoke, CO (used) | 3,780 ft | May 11 | Oct 3 |
| Sedgwick 5 S, CO | 3,996 ft | May 6 | Oct 7 |
| Julesburg, CO | 3,477 ft | May 7 | Oct 6 |
| Fleming 3Sw, CO | 4,256 ft | May 4 | Oct 11 |
Frost dates near Holyoke
- Amherst, CO 80721 · last May 11, first Oct 3
- Paoli, CO 80746 · last May 11, first Oct 3
- Haxtun, CO 80731 · last May 6, first Oct 7
- Venango, NE 69168 · last May 7, first Oct 6
- Ovid, CO 80744 · last May 7, first Oct 6
- Sedgwick, CO 80749 · last May 6, first Oct 7
- Julesburg, CO 80737 · last May 7, first Oct 6
- Champion, NE 69023 · last May 7, first Oct 5
Frequently asked questions
- When is the last frost in Holyoke, CO?
- For ZIP code 80734, the average last spring frost (32°F) is May 11, based on NOAA 1991-2020 climate normals for the Holyoke, CO weather station. There is a 1-in-10 chance of a frost after May 23.
- When is the first frost in Holyoke, CO?
- The average first fall frost (32°F) is October 3. There is a 1-in-10 chance of frost by September 20, so tender plants are at risk from that point on.
- How long is the growing season in 80734?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 144 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.