Les quatre dates qui comptent
| Date | Quand | Ce que cela veut dire |
|---|---|---|
| Dernier gel de printemps (50 %) | Apr 8 | Une année sur deux gèle après cette date. C’est une moyenne, pas une garantie. |
| Dernier gel de printemps (10 %) | Apr 30 | Une année sur dix seulement gèle après. À retenir pour ce que vous ne pouvez pas vous permettre de resemer. |
| Premier gel d’automne (50 %) | Oct 31 | Une année sur deux gèle avant cette date. Les cultures d’automne se comptent à rebours depuis là. |
| Premier gel d’automne (10 %) | Oct 17 | Une année à gel précoce. Si une culture doit finir, visez une récolte avant cette date. |
Semis de printemps et d’été à Salt Lake City
Les dates sont calculées à partir du dernier gel propre à ce lieu, pas d’un tableau générique par zone. Les « meilleurs jours lunaires » sont les jours de chaque fenêtre qui tombent dans la phase traditionnelle de la culture — la règle même de l’application.
| Culture | Semis à l’abri | Plantation dehors | Meilleurs jours lunaires | Jours avant récolte |
|---|---|---|---|---|
| Strawberry (crowns) transplant |
— | Feb 7 – Mar 18 | Mar 3 Full Moon |
perennial — first real harvest next season |
| Garlic cloves/sets Mieux vaut semer en automne — voir plus bas |
— | Feb 20 – Mar 23 | Mar 4–9 Waning Gibbous |
240–300 |
| Asparagus (crowns) transplant |
— | Feb 25 – Apr 1 | Mar 25 First Quarter |
perennial — first real harvest 2–3 years |
| Chives either |
Feb 11 | Feb 25 – Apr 1 | Mar 19–24 Waxing Crescent |
75–90 |
| Onion (from sets/transplants) cloves/sets |
— | Feb 25 – Apr 1 | Mar 4–9 Waning Gibbous |
90–120 |
| Peas (English/snap) direct sow |
— | Feb 25 – Apr 1 | Mar 25 First Quarter |
55–75 |
| Spinach direct sow |
— | Feb 25 – Apr 1 | Mar 19–24 Waxing Crescent |
35–50 |
| Cabbage transplant |
Feb 4 | Mar 4 – Apr 1 | Mar 19–24 Waxing Crescent |
65–90 |
| Collards either |
Feb 25 | Mar 4 – Apr 22 | Mar 19–24 Waxing Crescent |
55–85 |
| Kale either |
Feb 25 | Mar 4 – Apr 8 | Mar 19–24 Waxing Crescent |
50–65 |
| Lettuce (leaf) either |
Mar 4 | Mar 4 – Apr 29 | Mar 19–24 Waxing Crescent |
40–55 |
| Potato cloves/sets |
— | Mar 4 – Apr 8 | Apr 1 Full Moon |
70–120 |
| Radish direct sow |
— | Mar 4 – Apr 29 | Mar 4–9 Waning Gibbous |
22–35 |
| Turnip direct sow |
— | Mar 4 – Apr 15 | Mar 4–9 Waning Gibbous |
40–60 |
| Broccoli transplant |
Feb 4 | Mar 9 – Apr 8 | Mar 19–24 Waxing Crescent |
55–80 |
| Brussels Sprouts transplant |
Feb 4 | Mar 9 – Apr 8 | Mar 19–24 Waxing Crescent |
90–110 |
| Leek transplant |
Jan 28 | Mar 9 – Apr 8 | Mar 9–10, Apr 2–5 Waning Gibbous |
100–120 |
| Lettuce (head) transplant |
Feb 18 | Mar 9 – Apr 8 | Mar 19–24 Waxing Crescent |
60–85 |
| Parsley either |
Feb 4 | Mar 9 – Apr 15 | Mar 19–24 Waxing Crescent |
70–90 |
| Parsnip direct sow |
— | Mar 9 – Apr 15 | Apr 1 Full Moon |
100–150 |
| Shallot cloves/sets Mieux vaut semer en automne — voir plus bas |
— | Mar 9 – Apr 8 | Mar 9–10, Apr 2–5 Waning Gibbous |
90–120 |
| Beet direct sow |
— | Mar 11 – Apr 29 | Apr 1 Full Moon |
50–65 |
| Kohlrabi either |
Feb 25 | Mar 11 – Apr 15 | Mar 19–24 Waxing Crescent |
45–60 |
| Carrot direct sow |
— | Mar 18 – Apr 29 | Apr 1 Full Moon |
65–85 |
| Cauliflower transplant |
Feb 4 | Mar 18 – Apr 8 | Mar 19–24 Waxing Crescent |
55–80 |
| Cilantro direct sow |
— | Mar 18 – Apr 29 | Mar 19–24 Waxing Crescent |
45–70 |
| Swiss Chard direct sow |
— | Mar 18 – May 8 | Mar 19–24 Waxing Crescent |
50–60 |
| Dill direct sow |
— | Mar 25 – May 8 | Apr 18–22 Waxing Crescent |
40–60 |
| Cucumber either |
Mar 18 | Apr 8 – May 8 | Apr 23 First Quarter |
50–70 |
| Green Beans (bush) direct sow |
— | Apr 8 – May 23 | Apr 23, May 23 First Quarter |
50–65 |
| Oregano transplant |
Feb 11 | Apr 8 – Apr 29 | Apr 23 First Quarter |
cut as needed |
| Sage transplant |
Feb 11 | Apr 8 – Apr 29 | Apr 23 First Quarter |
cut as needed |
| Sweet Corn direct sow |
— | Apr 8 – May 23 | Apr 23, May 23 First Quarter |
60–100 |
| Thyme transplant |
Feb 11 | Apr 8 – Apr 29 | Apr 23 First Quarter |
cut as needed |
| Zucchini / Summer Squash either |
Mar 18 | Apr 8 – May 8 | Apr 23 First Quarter |
45–60 |
| Basil either |
Feb 25 | Apr 15 – May 8 | Apr 18–22 Waxing Crescent |
30–60 |
| Dry Beans direct sow |
— | Apr 15 – May 13 | Apr 23 First Quarter |
85–100 |
| Pole Beans direct sow |
— | Apr 15 – May 18 | Apr 23 First Quarter |
60–75 |
| Pumpkin direct sow |
Mar 18 | Apr 15 – May 13 | Apr 23 First Quarter |
90–120 |
| Rosemary transplant |
Apr 8 | Apr 15 – May 8 | Apr 23 First Quarter |
cut as needed |
| Tomatillo transplant |
Feb 25 | Apr 15 – May 8 | Apr 23 First Quarter |
60–75 |
| Tomato transplant |
Feb 25 | Apr 15 – May 8 | Apr 23 First Quarter |
60–85 |
| Winter Squash direct sow |
Mar 18 | Apr 15 – May 13 | Apr 23 First Quarter |
85–110 |
| Cantaloupe / Muskmelon either |
Mar 18 | Apr 22 – May 13 | Apr 23 First Quarter |
75–90 |
| Eggplant transplant |
Feb 11 | Apr 22 – May 13 | Apr 23 First Quarter |
60–90 |
| Okra direct sow |
Mar 11 | Apr 22 – May 18 | Apr 23 First Quarter |
50–70 |
| Pepper transplant |
Feb 11 | Apr 22 – May 13 | Apr 23 First Quarter |
60–90 |
| Sweet Potato slips |
— | Apr 22 – May 18 | May 2–7 Waning Gibbous |
90–150 |
| Watermelon either |
Mar 18 | Apr 22 – May 13 | Apr 23 First Quarter |
70–90 |
Semis d’automne à Salt Lake City
Les dates d’automne se comptent à rebours depuis le premier gel, et elles rajoutent du temps pour le « facteur d’automne » : les jours raccourcissent et refroidissent, donc une culture pousse plus lentement que ne le promet le sachet. Semer trop tard est de loin la première cause d’échec d’un potager d’automne.
| Culture | Semer ou mettre en place | Meilleurs jours lunaires | Jours avant récolte | Rusticité |
|---|---|---|---|---|
| Tomato | Jun 15 – Jul 21 | Jun 21, Jul 21 | 60–85 | very tender |
| Brussels Sprouts | Jun 18 – Jul 5 | Jun 18–20 | 90–110 | hardy |
| Potato | Jun 23 – Jul 25 | Jun 29 | 70–120 | semi-hardy |
| Sweet Corn | Jun 28 – Jul 21 | Jul 21 | 60–100 | tender |
| Pole Beans | Jul 8 – Jul 21 | Jul 21 | 60–75 | tender |
| Parsley | Jul 11 – Jul 25 | Jul 15–20 | 70–90 | semi-hardy |
| Okra | Jul 13 – Aug 12 | Jul 21 | 50–70 | very tender |
| Cabbage | Jul 18 – Jul 30 | Jul 18–20 | 65–90 | hardy |
| Carrot | Jul 18 – Jul 30 | Jul 29 | 65–85 | semi-hardy |
| Collards | Jul 18 – Aug 9 | Jul 18–20 | 55–85 | hardy |
| Cucumber | Jul 18 – Jul 31 | Jul 21 | 50–70 | tender |
| Broccoli | Jul 23 – Aug 9 | — | 55–80 | hardy |
| Cauliflower | Jul 23 – Aug 9 | — | 55–80 | semi-hardy |
| Green Beans (bush) | Jul 23 – Jul 31 | — | 50–65 | tender |
| Lettuce (head) | Jul 23 – Aug 4 | — | 60–85 | semi-hardy |
| Peas (English/snap) | Jul 23 – Aug 9 | — | 55–75 | hardy |
| Beet | Jul 28 – Aug 14 | Jul 29 | 50–65 | semi-hardy |
| Kale | Jul 28 – Aug 14 | Aug 13–14 | 50–65 | hardy |
| Swiss Chard | Jul 28 – Aug 14 | Aug 13–14 | 50–60 | semi-hardy |
| Zucchini / Summer Squash | Jul 28 – Aug 5 | — | 45–60 | tender |
| Basil | Aug 2 – Aug 20 | Aug 13–18 | 30–60 | very tender |
| Kohlrabi | Aug 2 – Aug 19 | Aug 13–18 | 45–60 | hardy |
| Cilantro | Aug 7 – Aug 19 | Aug 13–18 | 45–70 | semi-hardy |
| Lettuce (leaf) | Aug 7 – Aug 24 | Aug 13–18 | 40–55 | semi-hardy |
| Turnip | Aug 7 – Aug 24 | — | 40–60 | hardy |
| Spinach | Aug 12 – Aug 29 | Aug 13–18 | 35–50 | hardy |
| Dill | Aug 17 – Aug 24 | Aug 17–18 | 40–60 | semi-hardy |
| Radish | Aug 17 – Sep 11 | Aug 28–Sep 2 | 22–35 | hardy |
| Garlic | Oct 1 – Nov 21 | Oct 1–2, Oct 26–29 | 240–300 | hardy |
| Shallot | Oct 15 – Nov 15 | Oct 26–31 | 90–120 | hardy |
D’où viennent ces chiffres
Les dates de gel de cette page sont des normales observées en station, pas des estimations : elles viennent de Salt Lake City Intl Ap (GHCN USW00024127), l’une des 6 808 stations américaines des Climate Normals 1991–2020 de la NOAA. La zone de rusticité vient de l’USDA Plant Hardiness Zone Map 2023. Le calendrier des cultures est exprimé en décalages par rapport à vos gelées, d’après les guides de semis des Extensions universitaires.
Quelle est la précision de tout cela ?
Extension recommendations for the same crop routinely disagree by two to four weeks, and occasionally more, so these offsets should be presented as windows and starting points rather than deadlines. Three things drive the spread. (1) Regional risk tolerance: for warm-season crops, Colorado State and Utah State put tomatoes, peppers and melons out about 14 days after the last frost, while University of Missouri's calendar works out to roughly 25-35 days after the last frost and University of Maryland's window runs from the frost date itself out to 45 days past it. That is a real 6-week spread for the single most popular garden crop, and it exists because a short-season mountain state is optimizing against a short season while a humid continental state is optimizing against cold, wet spring soil. (2) Soil temperature versus calendar date: most Extension services now say the honest trigger is soil temperature at 4 inches, not the frost date, and the frost-relative number is a convenience translation. A cold, wet spring can push the real date two or three weeks past the calendar recommendation. (3) Days-to-maturity is variety-specific and is measured differently for direct-seeded versus transplanted crops - seed catalogs count from transplant date for tomatoes, peppers, eggplant and cole crops, but from sowing for roots and greens - so a 'days to maturity' range of 60-85 for tomato is genuinely 60-85 depending on which packet you bought. Additionally, the average last frost is a 50% probability, meaning half of all years have a frost after that date; Extension services commonly advise waiting 1-2 weeks past it for anything frost-tender, or being prepared to cover. Treat every number here as plus or minus about 10-14 days.
Sur la station elle-même : une station météo, c’est un point. Les villes gardent leur chaleur, les vallées accumulent l’air froid, et un jardin en versant nord peut avoir deux semaines de retard sur un autre à un mile de là. Prenez cette page comme point de départ et laissez votre jardin la corriger — c’est exactement à cela que sert le journal de l’application.
Lieux proches
Rappels de semis pour Salt Lake City
Un mot bref à chaque nouvelle et pleine lune sur ce qui est dans sa fenêtre en ce moment à Salt Lake City — calculé d’après les dates de gel de cette page. Gratuit, un clic pour arrêter.
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