Frost dates for 84763Rockville, UT
The average last spring frost in Rockville is April 13 and the average first fall frost is November 2, giving a typical growing season of about 202 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 13
- Average first fall frost
- Nov 2
- Growing season
- 202 days
Safer after May 2 (1-in-10 risk)
Possible by Oct 20 (1-in-10 risk)
First frost typically in 6 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) | Apr 9 · Apr 26 · May 14 | Oct 9 · Oct 24 · Nov 7 | 178 days | 100% |
| Frost / freeze (32°F) | Mar 22 · Apr 13 · May 2 | Oct 20 · Nov 2 · Nov 17 | 202 days | 100% |
| Hard freeze (28°F) | Feb 26 · Mar 23 · Apr 15 | Oct 27 · Nov 12 · Nov 26 | 231 days | 100% |
Planting calendar for Rockville
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 | Mar 13 – May 19 |
| Tomatoes | Transplant outdoors | Apr 29 – Jul 13 |
| Peppers | Start seeds indoors | Mar 13 – Apr 13 |
| Peppers | Transplant outdoors | May 13 – Jun 13 |
| Eggplant | Start seeds indoors | Mar 30 – Apr 28 |
| Eggplant | Transplant outdoors | May 13 – Jun 13 |
| Cucumbers | Sow outdoors | May 13 – Jul 23 |
| Summer squash | Sow outdoors | Apr 29 – Jun 13 |
| Winter squash & pumpkins | Sow outdoors | May 13 – Jun 13 |
| Snap beans | Sow outdoors | Apr 29 – Aug 15 |
| Sweet corn | Sow outdoors | Apr 29 – Jul 13 |
| Watermelon & cantaloupe | Sow outdoors | May 13 – Jun 13 |
| Okra | Sow outdoors | May 6 – May 29 |
| Peas | Sow outdoors (spring) | Mar 13 – Apr 28 |
| Potatoes | Plant outdoors (spring) | Mar 13 – May 13 |
| Onions | Start seeds indoors (spring) | Jan 30 – Feb 26 |
| Onions | Transplant outdoors (spring) | Mar 30 – Apr 28 |
| Broccoli | Start seeds indoors (spring) | Feb 23 – Mar 29 |
| Broccoli | Transplant outdoors (spring) | Mar 30 – Apr 28 |
| Broccoli | Start seeds indoors (fall) | Jul 3 – Jul 13 |
| Broccoli | Transplant outdoors (fall) | Aug 2 – Aug 13 |
| Cabbage | Start seeds indoors (spring) | Feb 13 – Mar 13 |
| Cabbage | Transplant outdoors (spring) | Mar 13 – Apr 13 |
| Cabbage | Start seeds indoors (fall) | Jun 23 – Jul 23 |
| Cabbage | Transplant outdoors (fall) | Jul 23 – Aug 23 |
| Leaf lettuce | Sow outdoors (spring) | Mar 13 – May 29 |
| Leaf lettuce | Sow outdoors (fall) | Jul 23 – Sep 8 |
| Spinach | Sow outdoors (spring) | Mar 6 – Apr 19 |
| Spinach | Sow outdoors (fall) | Aug 9 – Sep 13 |
| Radishes | Sow outdoors (spring) | Mar 13 – May 3 |
| Radishes | Sow outdoors (fall) | Jul 23 – Sep 23 |
| Kale | Sow outdoors (spring) | Mar 30 – Apr 19 |
| Kale | Sow outdoors (fall) | Jul 16 – Aug 23 |
| Carrots | Sow outdoors (spring) | Apr 13 – May 29 |
| Carrots | Sow outdoors (fall) | Jun 23 – Aug 8 |
| Garlic | Plant outdoors (fall) | Oct 23 – Nov 23 |
Where these dates come from
ZIP code 84763 is matched to the NOAA station Zion Np, UT, 7.7 km away, at 4,038 ft elevation (314 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Zion Np, UT (used) | 4,038 ft | Apr 13 | Nov 2 |
| Colorado City, AZ | 5,001 ft | Apr 26 | Oct 25 |
| La Verkin, UT | 3,194 ft | Apr 1 | Nov 5 |
| Orderville, UT | 5,460 ft | May 15 | Oct 8 |
Frost dates near Rockville
- Springdale, UT 84767 · last Apr 13, first Nov 2
- Virgin, UT 84779 · last Apr 1, first Nov 5
- Hildale, UT 84784 · last Apr 26, first Oct 25
- La Verkin, UT 84745 · last Apr 13, first Nov 2
- Colorado City, AZ 86021 · last Apr 26, first Oct 25
- Toquerville, UT 84774 · last Apr 1, first Nov 5
- Hurricane, UT 84737 · last Apr 1, first Nov 5
- Leeds, UT 84746 · last Apr 1, first Nov 5
Frequently asked questions
- When is the last frost in Rockville, UT?
- For ZIP code 84763, the average last spring frost (32°F) is April 13, based on NOAA 1991-2020 climate normals for the Zion Np, UT weather station. There is a 1-in-10 chance of a frost after May 2.
- When is the first frost in Rockville, UT?
- The average first fall frost (32°F) is November 2. There is a 1-in-10 chance of frost by October 20, so tender plants are at risk from that point on.
- How long is the growing season in 84763?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 202 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.