Frost dates for 89404Denio, NV
The average last spring frost in Denio is May 30 and the average first fall frost is September 18, giving a typical growing season of about 111 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 30
- Average first fall frost
- Sep 18
- Growing season
- 111 days
Safer after Jun 15 (1-in-10 risk)
Possible by Sep 5 (1-in-10 risk)
Last frost typically in 207 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 30 · Jun 14 · Jul 1 | Aug 26 · Sep 8 · Sep 23 | 86 days | 100% |
| Frost / freeze (32°F) | May 13 · May 30 · Jun 15 | Sep 5 · Sep 18 · Oct 3 | 111 days | 100% |
| Hard freeze (28°F) | Apr 28 · May 11 · May 30 | Sep 14 · Oct 1 · Oct 18 | 140 days | 100% |
Planting calendar for Denio
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 29 – Jul 5 |
| Tomatoes | Transplant outdoors | Jun 15 – May 29 |
| Peppers | Start seeds indoors | Apr 29 – May 30 |
| Peppers | Transplant outdoors | Jun 29 – Jul 30 |
| Eggplant | Start seeds indoors | May 16 – Jun 14 |
| Eggplant | Transplant outdoors | Jun 29 – Jul 30 |
| Cucumbers | Sow outdoors | Jun 29 – Jun 8 |
| Summer squash | Sow outdoors | Jun 15 – Jul 30 |
| Winter squash & pumpkins | Sow outdoors | Jun 29 – Jul 30 |
| Snap beans | Sow outdoors | Jun 15 – Jul 1 |
| Sweet corn | Sow outdoors | Jun 15 – May 29 |
| Watermelon & cantaloupe | Sow outdoors | Jun 29 – Jul 30 |
| Okra | Sow outdoors | Jun 22 – Jul 15 |
| Peas | Sow outdoors (spring) | Apr 29 – Jun 14 |
| Potatoes | Plant outdoors (spring) | Apr 29 – Jun 29 |
| Onions | Start seeds indoors (spring) | Mar 18 – Apr 14 |
| Onions | Transplant outdoors (spring) | May 16 – Jun 14 |
| Broccoli | Start seeds indoors (spring) | Apr 11 – May 15 |
| Broccoli | Transplant outdoors (spring) | May 16 – Jun 14 |
| Broccoli | Start seeds indoors (fall) | May 19 – May 29 |
| Broccoli | Transplant outdoors (fall) | Jun 18 – Jun 29 |
| Cabbage | Start seeds indoors (spring) | Apr 1 – Apr 29 |
| Cabbage | Transplant outdoors (spring) | Apr 29 – May 30 |
| Cabbage | Start seeds indoors (fall) | May 9 – Jun 8 |
| Cabbage | Transplant outdoors (fall) | Jun 8 – Jul 9 |
| Leaf lettuce | Sow outdoors (spring) | Apr 29 – Jul 15 |
| Leaf lettuce | Sow outdoors (fall) | Jun 8 – Jul 25 |
| Spinach | Sow outdoors (spring) | Apr 22 – Jun 5 |
| Spinach | Sow outdoors (fall) | Jun 25 – Jul 30 |
| Radishes | Sow outdoors (spring) | Apr 29 – Jun 19 |
| Radishes | Sow outdoors (fall) | Jun 8 – Aug 9 |
| Kale | Sow outdoors (spring) | May 16 – Jun 5 |
| Kale | Sow outdoors (fall) | Jun 1 – Jul 9 |
| Carrots | Sow outdoors (spring) | May 30 – Jul 15 |
| Carrots | Sow outdoors (fall) | May 9 – Jun 24 |
| Garlic | Plant outdoors (fall) | Sep 8 – Oct 9 |
Where these dates come from
ZIP code 89404 is matched to the NOAA station Denio, NV, 0.1 km away, at 4,190 ft elevation (16 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Denio, NV (used) | 4,190 ft | May 30 | Sep 18 |
| Fields, OR | 4,227 ft | May 10 | Oct 7 |
| Kings Rvr Vly - Orovada 26Nw, NV | 4,240 ft | May 28 | Sep 23 |
| Leonard Creek Rch - Denio 33S, NV | 4,239 ft | May 8 | Oct 11 |
Frost dates near Denio
- Fields, OR 97710 · last May 10, first Oct 7
- Orovada, NV 89425 · last Jun 2, first Sep 11
- Mc Dermitt, NV 89421 · last —, first —
- Frenchglen, OR 97736 · last May 10, first Oct 7
- Paradise Valley, NV 89426 · last Jun 5, first Sep 13
- Adel, OR 97620 · last May 26, first Oct 1
- Diamond, OR 97722 · last May 29, first Sep 18
- Plush, OR 97637 · last Jun 6, first Sep 14
Frequently asked questions
- When is the last frost in Denio, NV?
- For ZIP code 89404, the average last spring frost (32°F) is May 30, based on NOAA 1991-2020 climate normals for the Denio, NV weather station. There is a 1-in-10 chance of a frost after June 15.
- When is the first frost in Denio, NV?
- The average first fall frost (32°F) is September 18. There is a 1-in-10 chance of frost by September 5, so tender plants are at risk from that point on.
- How long is the growing season in 89404?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 111 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.